TW202008311A - Image saturation adjusting method and device - Google Patents

Abstract

The embodiment of the invention discloses an image saturation adjusting method and device. The method comprises the following steps: computing saturation S based on chroma component Cb and chroma Cr of pixel points in a YCbCr chroma space image, and determining the maximum saturation Smax and minimum saturation Smin in the YCbCr chroma space image, correcting the saturation through a correction factor c, and importing an adjusting factor k for adjusting the saturation S in the correction process, and finally obtaining the image with the corrected saturation. Through the above method disclosedby the embodiment of the invention, the image color distortion caused by excessive or insufficient color saturation adjusting in the image color saturation adjusting process is solved.

Description

Method and device for adjusting image saturation

This application requires the priority of the Chinese patent application filed on August 01, 2018 in the Chinese Patent Office with the application number 201810867044.2 and the invention titled "An Image Saturation Adjustment Method and Device", the entire contents of which are incorporated herein by reference Applying.

The invention relates to the field of electronic information technology, in particular to an image saturation adjustment method and device.

Video signals refer to television signals, still image signals, and visual television image signals. Video signals will cause image quality degradation during transmission, reception and processing, and video encoding compression transmission will also destroy image quality. In order to meet the user's visual requirements for high definition and high image quality. It is necessary to process low-quality images that occur during the transmission, reception, and processing of video signals, and images that are destroyed during the compression and transmission of video encoding.

In the prior art, the method of adjusting the color saturation of the image, that is, the adjustment of the color hue, color vividness, and picture clarity of the image is mostly used to improve the display effect of the image picture. However, in the process of adjusting the color saturation of the image, the problem of color distortion in the image will occur due to excessive or insufficient adjustment of the color saturation.

In view of this, embodiments of the present invention provide an image saturation adjustment method and device, which process image saturation to solve the problem of image color distortion caused by excessive or insufficient adjustment of image color saturation.

To achieve the above object, the embodiments of the present invention provide the following technical solution: An image saturation adjustment method, including: converting a red, green, and blue RGB chromaticity space image into a luminance chromaticity component YC _b C _r chromaticity space image;

The saturation S of each primitive is calculated based on the chroma component C _b and the chroma component C _r of each primitive in the YC _b C _r chromaticity space image, and the YC _b C _r chromaticity space is determined The maximum saturation S _max and the minimum saturation S _{min in the image} ;

Correct the saturation S of each primitive based on the correction factor c of each primitive, respectively, to obtain the image after correction of saturation;

Wherein, the correction factor c=k×△S _max , △S _max is the saturation adjustment variable, △S _max is the difference between the maximum saturation S _max and the saturation S of the current primitive, k is Constant, the value of k is a positive number greater than 0.

Preferably, the calculating the saturation S of each primitive based on the chroma component C _b and the chroma component C _{r in} the luma-chroma component YC _b C _r chroma space image includes:

Determine the chrominance component C _b and the chrominance component C _r of each primitive in the YC _b C _r chromaticity space image;

計算每個圖元的飽和度S。 According to the formula

Calculate the saturation S of each primitive.

Preferably, in the process of correcting the saturation S of each primitive based on the correction factor c of each primitive, the process of correcting the saturation S of the current primitive includes:

Obtain the saturation S of the current image primitive point, calculate the difference between the maximum saturation S _max and the current primitive saturation S, and determine the saturation adjustment variable △S _{max of the} current primitive;

Adjust the product of the variable ΔS _max and the constant k based on the saturation of the current primitive to obtain the correction factor c of the current primitive;

對當前圖元的飽和度S進行修正； According to the formula

Correct the saturation S of the current primitive;

Wherein, when the correction factor c of the current picture element is greater than 0, increase the saturation S of the current picture element, and when the correction factor c of the current picture element is less than 0, decrease the saturation degree of the current picture element S.

Preferably, the value range of the constant k is a positive number greater than 0 and less than 1.

Preferably, the value of the constant k is the product of the control factor k1 and the control factor k2;

The setting process of the control factor k1 includes:

Divide the saturation interval formed from the minimum saturation S _min to the maximum saturation S _max according to N equal divisions to obtain N saturation intervals, where N is a positive integer greater than or equal to 5;

Set the value of the control factor k1 corresponding to the first saturation interval to M, and the value of M is a positive number greater than 0 and less than 1;

Set the control factor k1 corresponding to the second saturation interval to the Nth saturation interval to increase on the basis of the M value by a preset value m, and the value of the preset value m is a positive number greater than 0 and less than 1;

The setting process of the control factor k2 includes: obtaining the luminance component Y of each primitive in the YC _b C _r chromaticity space image;

The intensity range of [20,220] is divided into N equal parts based on the luminance component Y of each primitive to obtain N luminance intervals, and the value of the control factor K2 corresponding to the N luminance intervals is determined by the interval where the corresponding luminance component Y is located determine.

A second aspect of the present invention discloses an image saturation adjustment device. The device includes:

The conversion unit is used to convert the red, green and blue RGB chromaticity space image into the luminance chrominance component YC _b C _r chromaticity space image;

A calculation unit for calculating the saturation S of each primitive based on the chroma component C _b and the chroma component C _r of each primitive in the YC _b C _r chromaticity space image, to determine the YC _b The maximum saturation S _max and the minimum saturation S _min in the image of _Cr color space;

The correction unit is used to correct the saturation of each primitive based on the correction factor c of each primitive, respectively, to obtain an image after the correction of saturation;

Wherein, the correction factor c=k×△S _max , △S _max is the saturation adjustment variable, △S _max is the difference between the maximum saturation S _max and the saturation S of the current primitive, k is Constant, the value of k is a positive number greater than 0.

Preferably, the calculation unit includes: a determination module for determining a chroma component C _b and a chroma component C _r of each primitive in the YC _b C _r chromaticity space image;

計算每個圖元的飽和度S。 The first calculation module, used according to the formula

Calculate the saturation S of each primitive.

Preferably, the correction module includes

The second calculation module is used to obtain the saturation S of the current primitive, calculate the difference between the maximum saturation S _max and the saturation S of the current primitive, and determine the saturation adjustment variable △S _{max of the} current primitive;

The third calculation module is used to adjust the product of the variable ΔS _max and the constant k based on the saturation of the current primitive to obtain the correction factor c of the current primitive;

對當前圖元的飽和度S進行修正；其中，當所述當前圖元的修正因數c大於0時，提高所述當前圖元的飽和度S，當所述當前圖元的修正因數c小於0時，降低所述當前圖元的飽和度S。 Modification module for formula

Modify the saturation S of the current picture element; wherein, when the correction factor c of the current picture element is greater than 0, increase the saturation S of the current picture element, when the correction factor c of the current picture element is less than 0 , The saturation S of the current picture element is reduced.

Preferably, the method further includes: a first setting unit; the setting unit is configured to set a constant k to be a positive number greater than 0 and less than 1.

Preferably, the method further includes: a second setting unit, configured to set the value of the constant k as the product of the control factor k1 and the control factor k2;

The setting unit includes: a control factor k1 setting module and a control factor k2 setting module;

The control factor k1 setting module is used to divide the saturation interval formed from the minimum saturation S _min to the maximum saturation S _max according to N equal parts to obtain N saturation intervals, where N is equal to or greater than 5. Positive integer; set the value of the control factor k1 corresponding to the first saturation interval to M, and the value of M is a positive number greater than 0 and less than 1; set the control factor corresponding to the second saturation interval to the Nth saturation interval k1 is incremented by a preset value m, and the value of the preset value m is a positive number greater than 0 and less than 1;

The control factor k2 setting module is used to obtain the luminance component Y of each primitive in the YC _b C _r chromaticity space image; based on the luminance component Y of each primitive, the luminance of [20,220] N equal divisions are performed to obtain N brightness intervals, and the value of the control factor K2 corresponding to the N intervals is determined by the current brightness component Y.

The embodiment of the present invention adopts the above-disclosed image saturation adjustment method and device, which include calculating a primitive based on the chroma component C _b and the chroma component C _{r of the} primitive point in the YC _b C _r chromaticity space image The saturation S of the point, determine the maximum saturation S _max and the minimum saturation S _{min in} the YC _b C _r chromaticity space image, correct the saturation by the correction factor c, and introduce the saturation during the correction process The adjustment factor k adjusted by the degree S finally obtains the image after correcting the saturation. Through the above method, the color distortion of the image caused by excessive or insufficient adjustment of the color saturation in the process of adjusting the color saturation of the image is solved.

YC _b C _r ‧‧‧ color space image

c‧‧‧ correction factor

k‧‧‧Adjustment factor (constant)

k1, k2‧‧‧Control factor

M‧‧‧ value

m‧‧‧Default

401‧‧‧Conversion unit

402‧‧‧Calculation unit

403‧‧‧ correction unit

404‧‧‧ Confirm module

S201, S202, S203, S301, S302, S303

C _b, C _r ‧‧‧ chroma component

S‧‧‧Saturation

S _max ‧‧‧ maximum saturation

S _min ‧‧‧Minimum saturation

△S _max ‧‧‧Saturation adjustment variable

Y‧‧‧Brightness component

405‧‧‧The first computing module

406‧‧‧Second computing module

407‧‧‧ Third Computing Module

408‧‧‧ Modification module

In order to more clearly explain the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only For the embodiment of the invention, for those of ordinary skill in the art, without paying any creative labor, other drawings may be obtained according to the provided drawings.

FIG. 1 is a diagram of the correspondence between the coordinates of UV, C _b C _r and the hue circle provided in Embodiment 1 of the present invention;

FIG. 2 is a flowchart of an image saturation adjustment method according to Embodiment 1 of the present invention;

FIG. 3 is a flowchart of another image saturation adjustment method according to Embodiment 2 of the present invention;

FIG. 4 is a schematic diagram of an image saturation adjustment device according to Embodiment 3 of the present invention.

The technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.

It can be known from the background art that in the prior art, the method of adjusting the color saturation of the image, that is, the method of adjusting the color hue, color vividness and screen clarity of the image is mostly used to improve the display effect of the image screen . However, in the process of adjusting the color saturation of the image, the problem of color distortion in the image will occur due to excessive or insufficient adjustment of the color saturation. Thus, an embodiment of the present invention discloses an image saturation adjustment method, each of which is calculated from the chrominance component C _b and the chrominance component C _r of each primitive in the YC _b C _r chromaticity space image The saturation S of the primitives determines the maximum saturation S _max and the minimum saturation S _{min in} the YC _b C _r chromaticity space image, due to the correction factor c of each primitive for the saturation of each primitive S is corrected to obtain an image with the corrected saturation S.

In order to more clearly describe the color attributes involved in the image processing process disclosed in the present invention, as shown in FIG. 1, a rectangular coordinate system is established with the CbCr chrominance signal as the axis. For example: Figure 1 and Table 1 show the relationship between the chroma component U(Cb)V(Cr) and the hue circle, and the phase angle is often used to represent different colors.

Example one

As shown in FIG. 2, it is a schematic flowchart of an image saturation adjustment method according to an embodiment of the present invention, including the following steps:

Step S201: Convert a red, green, and blue (Red, Green, Blue, RGB) chromaticity space image into a luminance chrominance component YC _b C _r chromaticity space image.

The RGB chromaticity space is a color standard in the industrial world. RGB is called 3 primary colors. It realizes various colors by superimposing the numerical transformation of the three color channels of red R, green G, and blue B.

The luminance chrominance component YC _b C _r chrominance space image is converted from the RGB chrominance space image, where Y refers to the luminance component, C _b refers to the blue chrominance component, and _Cr refers to the red chrominance component is color A type of space, usually used for continuous processing of images in movies, or in digital photography systems.

Step S202: Calculate the saturation S of each primitive based on the chroma component C _b and the chroma component C _r of each primitive in the YC _b C _r chromaticity space image, and determine the YC _b C _r The maximum saturation S _max and the minimum saturation S _min in the color space image.

It should be noted that the YC _b C _r chromaticity space single-frame image includes multiple primitive points.

When step S102 is performed, converting the RGB chromaticity space image to the luminance chrominance component YC _b C _r chromaticity space image includes the following steps:

First, the chrominance component C _b and the chrominance component C _r of each primitive in the YC _b C _r chromaticity space image are determined.

In a specific implementation process, the chrominance components C _b and C _r in the YC _b C _r chromaticity space are obtained through conversion of R, G, and B components in the RGB chromaticity space, and the specific conversion process is:

C _b =0.439R+0.368G+0.071B

C _r =0.148R+0.291G+0.439B.

Secondly, the saturation S of each primitive is calculated according to formula (1).

Formula (1) is specifically:

It should be noted that S indicates saturation, and a larger S value indicates a more saturated color, and a smaller S value indicates a lower color saturation.

In the specific implementation process, calculate the saturation S of each primitive according to formula (1), and then compare the calculated saturation S of each primitive constituting the YC _b C _r chromaticity space image to determine the maximum saturation Degree S _max and minimum saturation S _min .

It should be noted that, taking the chrominance component C _b and the chrominance component C _r of each primitive as arguments, according to the definition domain of C _b and C _r , the range of the dependent variable S can be obtained, namely [S _min , S _max ] value.

Step S203: Correct the saturation S of each primitive based on the correction factor c of each primitive, respectively, to obtain an image after the saturation is corrected.

Among them, the correction factor c of each picture element is determined by formula (2).

c=k×△S _max (2)

Where ΔS _max is a saturation adjustment variable, ΔS _max is the difference between the maximum saturation S _max and the saturation S of the current primitive, k is a constant, and k is a positive number greater than 0.

As can be seen from the above formula (2), the correction factor c is determined by the product of the constant k and the saturation variable △S _max , where k takes a positive value greater than 0 and less than 1, △S _max is the saturation adjustment variable, and △ S _max value is the difference between the maximum saturation S _max and S is the saturation current.

During the execution of step S203, it is necessary to correct the saturation S of each primitive based on the correction factor c of each primitive, so as to obtain the image primitive after the saturation is corrected.

After calculating the correction factor c corresponding to the saturation S of the current primitive, the saturation S of the primitive is corrected based on the calculated correction factor c.

The specific correction method is: when the correction factor c is greater than 0, the saturation S of the current picture element is increased, and when the correction factor c is less than 0, the saturation S of the current picture element is reduced. The embodiment of the present invention calculates the saturation S based on the chroma component C _b and the chroma component C _{r in} the YC _b C _r chromaticity space image through the image processing method disclosed above to determine the YC _b C _r color The maximum saturation S _max and the minimum saturation S _min in the spatial image. Correct the saturation S of the image primitive by the correction factor c to obtain the corrected saturation image, and set the value range of k to solve the problem of color saturation during the adjustment of the image color saturation Image color distortion caused by excessive or insufficient adjustment.

Based on the image saturation adjustment method disclosed in the embodiment of the above application, when step S203 shown in FIG. 2 is executed, the correction of the saturation S of the image primitive of one frame is used to explain the saturation of the image primitive of the current frame The specific process of correcting degree S is shown in Figure 3, including:

Step S301: Obtain the saturation S of the current image primitive, calculate the difference between the maximum saturation _{Smax of the} primitive and the saturation S of the current image primitive, and determine the saturation adjustment variable △S _{max of the} current primitive .

Step S302: Adjust the product of the variable ΔS _max and the constant k based on the saturation of the current picture element to obtain the correction factor c of the current picture element.

Step S303: Correct the saturation S of the current picture element according to formula (3). Formula (3) is specifically:

In the process of executing step S301, if the maximum saturation S _{max is} greater than the saturation S of the current picture element, the difference between the two is a positive value, and according to formula (2), the correction factor c of the current picture element obtained is greater than At 0, at this time, the saturation S of the image primitive is increased.

If the minimum saturation S _{min is} less than the saturation S of the current picture element, the difference between the two is a negative value. According to formula (2), when the obtained correction factor c of the current picture element is less than 0, the current picture is reduced Like the saturation S of the picture element.

It should be noted that the constant k is defined as any real number in formula (2). Preferably, if 0<k<1, based on the description in formula (2), the product of the constant k and ΔS _max can be used to linearly adjust the change in saturation, so as to control the increase and decrease of saturation, while avoiding Oversaturated and undersaturated phenomena occurred.

When the image saturation S is processed through the above steps, when the image saturation S is increased or when the image saturation S is decreased, the problems of oversaturation and undersaturation can be avoided.

Optionally, in order to provide a better subjective feeling for the human eye. The embodiment of the present invention further proposes to control the saturation S by using the luminance component Y. Specifically, in the YC _b C _r chromaticity space, the correction factor c is controlled using the luminance component Y.

It should be noted that the luminance component Y is obtained by converting the R, G, and B components of the RGB color space. The specific conversion process is:

Y=0.257R+0.504G+0.098B.

Based on the constant k described in formula (2), its value is the product of the control factor k1 and the control factor k2. The control factor k1 and the control factor k2 are set by the luminance component Y. The setting process of the control factor k1 and the control factor k2 will be described in detail below. The setting process of the control factor k1 includes:

First, divide the saturation interval formed from the minimum saturation S _min to the maximum saturation S _max according to N equal divisions to obtain N saturation intervals, where N is a positive integer greater than or equal to 5.

Secondly, the value of the control factor k1 corresponding to the first saturation interval is set to M, and the value of M is a positive number greater than 0 and less than 1.

Then, the control factor k1 corresponding to the second saturation interval to the Nth saturation interval is set to increase on the basis of the M value by a preset value m, and the value of the preset value m is a positive number greater than 0 and less than 1.

The setting process based on the above-mentioned control factor k1 will be exemplified here.

For example, when dividing the [S _min , S _max ] interval into N equal parts, take N equal to 5, and obtain 5 saturation intervals by dividing, by setting the value of the control factor k1 corresponding to the first saturation interval as M , Set M to 0.04, set the second saturation interval after obtaining the first saturation interval, and set the preset value m to 0.02, then the second saturation interval k1 is 0.06.

The setting process of the control factor k2 includes:

First, the luminance component Y of each primitive in the YC _b C _r chromaticity space image is acquired.

Then, the intensity range of [20,220] is divided into N equal divisions based on the luminance component Y of each primitive to obtain N luminance intervals, and the value of the control factor K2 corresponding to the N luminance intervals is determined by the corresponding luminance component Y The interval is determined.

It should be noted that the RGB color intensity range is [0,255], and the luminance component Y belongs to the RGB color intensity range. The preferred range of the luminance component Y to the RGB color intensity in the embodiment of the present invention is [20,220], but it is not limited to the RGB color intensity range.

Based on the above setting process of the control factor k2, an example will be described here.

For example, the setting of K2 is that the luminance component Y is divided into N equal parts in the [20,220] interval, and the value of N is 5 to obtain 5 intervals, so the control factor K2 corresponding to Y in 5 intervals is 0.2 , 1.8, 2.4, 1.0, 0.2.

Finally, based on the above steps, the saturation adjustment formula (4) can be finally obtained.

The embodiment of the present invention calculates the saturation of the primitive point based on the chroma component C _b and the chroma component C _r of the primitive point in the YC _b C _r chromaticity space image through the above disclosed image saturation adjustment method Degree S, determine the maximum saturation S _max and the minimum saturation S _{min in} the YC _b C _r chromaticity space image, correct the saturation by the correction factor c, and introduce the adjustment of the saturation S during the correction process Adjustment factor k, and finally get the image after saturation correction. The image saturation adjustment method disclosed in the present invention solves the saturation adjustment method in the prior art where the image cannot be oversampled in the low brightness and low contrast parts, thereby solving the color saturation in the process of adjusting the image color saturation Image color distortion caused by excessive or insufficient adjustment.

Example 2

Based on the image saturation adjustment method disclosed in the above embodiments of the present invention, an embodiment of the present invention also correspondingly discloses an image saturation adjustment device. As shown in FIG. 4, the image saturation adjustment device includes: a conversion unit 401 , Calculation unit 402 and correction unit 403.

The conversion unit 401 is configured to convert the red, green, and blue RGB chromaticity space image into the luminance chrominance component YC _b C _r chromaticity space image.

The calculating unit 402 is configured to calculate the saturation S of each primitive based on the chroma component C _b and the chroma component C _r of each primitive in the YC _b C _r chromaticity space image to determine the YC _b The maximum saturation S _max and the minimum saturation S _min in the image of the C _Cr color space.

The calculation unit 402 includes:

The determining module 404 is configured to determine the chrominance component C _b and the chrominance component C _r of each primitive in the YC _b C _r chromaticity space image.

計算每個圖元的飽和度S。 The first calculation module 405 is used according to the formula

Calculate the saturation S of each primitive.

The correction unit 403 is configured to correct the saturation of each primitive based on the correction factor c of each primitive, respectively, to obtain an image after saturation correction; wherein, the correction factor c=k×ΔS _max , △S _max is a saturation adjustment variable, △S _max is the difference between the maximum saturation S _max and the saturation S of the current picture element, k is a constant, and k is a positive number greater than 0.

Optionally, the correction unit 403 includes:

The second calculation module 406 is used to obtain the saturation S of the current primitive, calculate the difference between the maximum saturation S _max and the saturation S of the current primitive, and determine the saturation adjustment variable △S _{max of the} current primitive .

The third calculation module 407 is used to adjust the product of the variable ΔS _max and the constant k based on the saturation of the current picture element to obtain the correction factor c of the current picture element.

對當前圖元的飽和度S進行修正；其中，當所述當前圖元的修正因數c大於0時，提高所述當前圖元的飽和度S，當所述當前圖元的修正因數小於0時，降低所述當前圖元的飽和度S。 Modification module 408, used according to the formula

Correct the saturation S of the current picture element; wherein, when the correction factor c of the current picture element is greater than 0, increase the saturation S of the current picture element, when the correction factor of the current picture element is less than 0 To reduce the saturation S of the current primitive.

Optionally, the present invention may further include a first setting unit, which is used to set the value range of the constant k to be a positive number greater than 0 and less than 1.

Optionally, the present invention may further include a second setting unit, configured to set the value of the constant k as the product of the control factor k1 and the control factor k2.

The setting unit includes: a control factor k1 setting module and a control factor k2 setting module. The control factor k1 setting module is used to divide the saturation interval formed from the minimum saturation S _min to the maximum saturation S _max according to N equal divisions to obtain N saturation intervals, where N is a positive integer greater than or equal to 5. Set the value of the control factor k1 corresponding to the first saturation interval to M, and the value of M is a positive number greater than 0 and less than 1; set the control factor k1 corresponding to the second saturation interval to the Nth saturation interval to The preset value m increases, and the value of the preset value m is a positive number greater than 0 and less than 1.

The control factor k2 setting module is used to obtain the luminance component Y of each primitive in the YC _b C _r chromaticity space image; based on the luminance component Y of each primitive, a defined interval [20, 220] according to N etc. Divide into points to obtain N sub-intervals. The value of the control factor K2 corresponding to the N interval is determined by the corresponding current luminance component Y.

For the specific execution process and execution principle of the conversion unit 401, the calculation unit 402, and the correction unit 403 in the image saturation adjustment apparatus disclosed in the above embodiments of the present invention, please refer to the image processing methods and methods disclosed in the above embodiments of the present invention. The corresponding parts of the conversion unit 401, the calculation unit 402, and the correction unit 403 will not be repeated here.

In the embodiment of the present invention, through the image saturation adjustment device disclosed above, the calculation module is based on the chroma component C _b and the chroma component C _r of each primitive in the YC _b C _r chromaticity space image of the conversion module Calculate the saturation S of each picture element, determine the maximum saturation S _max and the minimum saturation S _min in the YC _b C _r chromaticity space image through the calculation module, and the correction module passes the correction factor c of each picture element Correct the saturation of each primitive, and finally get the corrected image. The above device solves the image color distortion caused by excessive or insufficient adjustment of the color saturation during the adjustment of the image color saturation.

The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown in this document, but should conform to the widest scope consistent with the principles and novel features disclosed in this document.

S201, S202, S203‧‧‧ steps

Claims (10)

An image saturation adjustment method, characterized in that the method includes: Convert the red, green and blue RGB chromaticity space image to the luminance chrominance component YC _b C _r chromaticity space image; The saturation S of each primitive is calculated based on the chroma component C _b and the chroma component C _r of each primitive in the YC _b C _r chromaticity space image, and the YC _b C _r chromaticity space is determined The maximum saturation S _max and the minimum saturation S _{min in the image} ; Correct the saturation S of each primitive based on the correction factor c of each primitive, respectively, to obtain the image after correction of saturation; Wherein, the correction factor c=k×△S _max , △S _max is the saturation adjustment variable, △S _max is the difference between the maximum saturation S _max and the saturation S of the current primitive, k is Constant, the value of k is a positive number greater than 0. The method as defined in claim 1 in the range of item, wherein, based on said calculated for each chrominance component and a chrominance component C _b C _r component of the luminance-chrominance color space YC _b C _r image Saturation S of primitives, including: Determine the chrominance component C _b and the chrominance component C _r of each primitive in the YC _b C _r chromaticity space image; According to the formula

Calculate the saturation S of each primitive. The method as described in item 1 of the patent application range, wherein the correction of the saturation S of each primitive based on the correction factor c of each primitive is performed on the saturation S of the current image The revision process includes: Obtain the saturation S of the current image primitive point, calculate the difference between the maximum saturation S _max and the current primitive saturation S, and determine the saturation adjustment variable △S _{max of the} current image; Adjust the product of the variable ΔS _max and the constant k based on the saturation of the current primitive to obtain the correction factor c of the current primitive; According to the formula

Correct the saturation S of the current primitive; Wherein, when the correction factor c of the current picture element is greater than 0, increase the saturation S of the current picture element, and when the correction factor c of the current picture element is less than 0, decrease the saturation degree of the current picture element S. The method according to any one of items 1 to 3 of the patent application range, wherein the value range of the constant k is a positive number greater than 0 and less than 1. The method according to any one of items 1 to 3 of the patent application range, wherein the value of the constant k is the product of the control factor k1 and the control factor k2; The setting process of the control factor k1 includes: Divide the saturation interval formed from the minimum saturation S _min to the maximum saturation S _max according to N equal divisions to obtain N saturation intervals, where N is a positive integer greater than or equal to 5; Set the value of the control factor k1 corresponding to the first saturation interval to M, and the value of M is a positive number greater than 0 and less than 1; Set the control factor k1 corresponding to the second saturation interval to the Nth saturation interval to increase on the basis of the M value by a preset value m, and the value of the preset value m is a positive number greater than 0 and less than 1; The setting process of the control factor k2 includes: Acquiring the luminance component Y of each primitive in the YC _b C _r chromaticity space image; The intensity range of [20,220] is divided into N equal parts based on the luminance component Y of each primitive to obtain N luminance intervals, and the value of the control factor K2 corresponding to the N luminance intervals is determined by the interval where the corresponding luminance component Y is located determine. An image saturation adjustment device, characterized in that the device includes: The conversion unit is used to convert the red, green and blue RGB chromaticity space image into the luminance chrominance component YC _b C _r chromaticity space image; A calculation unit for calculating the saturation S of each primitive based on the chroma component C _b and the chroma component C _r of each primitive in the YC _b C _r chromaticity space image, to determine the YC _b The maximum saturation S _max and the minimum saturation S _min in the image of _Cr color space; The correction unit is used to correct the saturation of each primitive based on the correction factor c of each primitive, respectively, to obtain an image after the correction of saturation; Wherein, the correction factor c=k×△S _max , △S _max is the saturation adjustment variable, △S _max is the difference between the maximum saturation S _max and the saturation S of the current primitive, k is Constant, the value of k is a positive number greater than 0. The device according to item 6 of the patent application range, wherein the calculation unit includes: A determination module for determining the chrominance component C _b and the chrominance component C _r of each primitive in the YC _b C _r chromaticity space image; The first calculation module, used according to the formula

Calculate the saturation S of each primitive. The device according to item 6 of the patent application range, wherein the correction module includes The second calculation module is used to obtain the saturation S of the current primitive, calculate the difference between the maximum saturation S _max and the saturation S of the current primitive, and determine the saturation adjustment variable △S _{max of the} current primitive; The third calculation module is used to adjust the product of the variable ΔS _max and the constant k based on the saturation of the current primitive to obtain the correction factor c of the current primitive; Modification module for formula

Modify the saturation S of the current picture element; wherein, when the correction factor c of the current picture element is greater than 0, increase the saturation S of the current picture element, when the correction factor c of the current picture element is less than 0 , The saturation S of the current picture element is reduced. The device according to any one of items 6-8 of the patent application scope, further comprising: a first setting unit; The setting unit is used to set the value range of the constant k to be a positive number greater than 0 and less than 1. The device according to any one of items 6-8 of the patent application range, further comprising: a second setting unit for setting the value of the constant k as the product of the control factor k1 and the control factor k2; The setting unit includes: a control factor k1 setting module and a control factor k2 setting module; The control factor k1 setting module is used to divide the saturation interval formed from the minimum saturation S _min to the maximum saturation S _max according to N equal parts to obtain N saturation intervals, where N is equal to or greater than 5. Positive integer; set the value of the control factor k1 corresponding to the first saturation interval to M, and the value of M is a positive number greater than 0 and less than 1; set the control factor corresponding to the second saturation interval to the Nth saturation interval k1 is incremented by a preset value m, and the value of the preset value m is a positive number greater than 0 and less than 1; The control factor k2 setting module is used to obtain the luminance component Y of each primitive in the YC _b C _r chromaticity space image; based on the luminance component Y of each primitive, the luminance of [20,220] N equal divisions are performed to obtain N brightness intervals, and the value of the control factor K2 corresponding to the N intervals is determined by the current brightness component Y.

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