JPS6065681A - Dynamic information detecting system of picture - Google Patents

Abstract

PURPOSE:To simplify the constitution and to attain low cost by using an inter- frame difference signal of a video signal of the interlacing scanning and detecting the dynamic information with a value adding each difference signal at plural adjacent sampling points on a scanning line. CONSTITUTION:A luminance difference signal DELTAYd representing a difference between frames in a video signal of the interlacing scanning is given to one stage of a register 22 via a weighting coefficient device 20 having a coefficient l1 and an adder 21, and after the signal is stored in response to a clock pulse CLK of the same frequency, the result is transmitted to a register 23. The signal is added to the luminance difference signal DELTAYd at the adder 21 via a weighting coefficient device 24 having a coefficient l2, and this operation is repeated. A value as the result of addition of the difference of luminance signals between fields at adjacent plural sampling points belonging to different frames and on corresponding field and both scanning lines is obtained at an output of the register 22 and this represents the dynamic information of the picture.

Description

TECHNICAL FIELD The present invention relates to a method for detecting motion information of an image from a video signal when converting a video signal based on interlaced scanning such as the NTSC system into a video signal using a progressive scanning system.

Background technology In standard television systems (NTSC system, SECAM system, PAL system, etc.), the luminance signal and color signal are composite signals that overlap each other on the frequency axis. In the separation method, cross colors occur, the resolution of the luminance signal decreases in the horizontal and vertical directions, and good image quality cannot be obtained. In addition, these methods employ interlaced scanning, and based on this, line flicker interference.

The image quality of the image deteriorates due to the fact that the bearing interference and the scanning line are viewed separately.

As a countermeasure for this, the luminance signal and color signal are separated based on the correlation between frames and between scanning lines, and the interpolated signal is generated by line interpolation and field interpolation. 1 of interlaced scanning after compensating for
It has been proposed to perform sequential scanning corresponding to one frame, and a progressive scanning conversion device has been developed to convert an interlaced scanning video signal into a progressive scanning video signal. For the purpose of detecting motion, a motion detector is used.

However, as disclosed in "Television Society of Japan Technical Report J (TEBS83-4, published on September 27, 1989, P19-P24), conventional motion detectors have a coring circuit, an isolated point removal circuit, , a difference signal interpolation circuit, etc., which has the disadvantage of becoming expensive due to the complicated structure.

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks of the conventional art, and it is an object of the present invention to provide an image motion information detection method that has a simple and inexpensive configuration and has a noise removal effect.

In order to achieve this object, the present invention uses a signal indicating the difference between frames in an interlaced scanning video signal, adds each difference signal value at a plurality of adjacent sampling points on a scanning line, It is assumed that the motion information of the image is detected by the added value.

Further, in the present invention, each of the difference signal values and each sampling point of a portion corresponding to the center of the sampling points on each scanning line located before and after the scanning line The difference signal value is added, and the added value is used to detect whether the image is distorted.

Therefore, according to the present invention, a motion information detecting means having a noise removing effect is realized with a simple and inexpensive configuration, so that remarkable effects can be obtained in detecting motion information of images used for progressive scan conversion.

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in detail with reference to figures showing embodiments.

FIG. 1 is a block diagram showing a specific example of a motion information detector to which the present invention is applied.
A luminance signal Yy separated from a field based on the inter-frame correlation and a luminance signal YL separated from one scanning line to another based on the inter-scanning correlation in the same field are given. is delay element 1
, 2, and then multiplied by coefficients Kp and KL by coefficient multipliers 3 and 4, added by adder 5, and sent out as a luminance signal Yyt for sequential scanning.

On the other hand, the luminance difference signal ΔY indicating the difference between frames is supplied to the motion detector 6, and when the detector 6 detects a change in the luminance difference signal ΔY, a detection force is generated, which is transmitted to the coefficient generator 7.
The generator 7 changes the coefficient KF in a complementary manner to give
, Kz, and thereby controls the coefficient to be raised to the power of the coefficient multiplier 3.4.

Therefore, when the image displayed by Image 1 (No. 3) is a still image, the coefficient Ky is set large, and when the image is a moving image, the coefficient K is set large.
The dependence of the luminance signal YR on the luminance signals Yp and Yx is determined by setting t to a dog and selecting the ratio of both coefficients KF and Kl- accordingly when the image is in an intermediate state. .

That is, in the case of a still image, the brightness of each frame does not change, so the brightness signal Yp can be used as the brightness signal Yn, but in the case of a moving image, the brightness of each frame changes,
Since using the luminance signal Yy will lead to inaccurate results, the luminance signal YL must be used as the luminance signal, and in an intermediate state between a still image and a moving image, the luminance signal YF is changed depending on the degree of movement.
and YL are required to be mixed in a suitable ratio,
These operations are realized by the configuration shown in FIG.

By the way, recursive filters and transversal filters are used as means for noise removal.
The figure shows an example of a transversal filter. Also,
Figure 4 shows an example of a two-dimensional filter and will be described below.

The coefficient generator 1 has a plurality of threshold levels, and after determining the bell detected by the motion detector 6, sends signals indicating the coefficients @Ky and Kt. is used.

Furthermore, interpolated luminance No. 48 is requested by a separate circuit based on signals equivalent to the luminance signals Yp and YL, and
This signal is temporarily stored together with R in a memory or the like, and then sent out at a scanning speed twice that of interlaced scanning, resulting in a progressive scanning luminance signal.

Additionally, the motion detector 6 and coefficient generator 7 are used not only to control the circuit that generates the luminance signal YR, but also to control the circuit that generates the interpolated luminance signal, the circuit that generates the color signal for sequential scanning, etc. can also be used.

FIG. 2 is a block diagram of an embodiment of the motion information detection circuit, and the luminance difference signal ΔYd indicating the difference between frames digitized according to the sampling clock pulse is weighted by the coefficient 11 by the coefficient multiplier 20. It is applied to the first stage register 22 via the adder 21, stored in the register 22 in response to the clock pulse CLK having the same frequency as the sampling clock pulse, and then sent to the next stage register 23. The weighting is added to the brightness difference signal ΔYd in the adder 21 via the coefficient unit 24, and this Dr operation is repeated, and the output of the register 22 contains information of fields belonging to different frames and corresponding to each other. , a value is obtained by adding the inter-field differences of each luminance signal at a plurality of sampling points adjacent to each other on both corresponding scanning hexes, and this value represents the movement information of the founding team.

The output of the register 22 is accumulated in the register 23 in response to a clear pulse CLR that is generated in synchronization with the horizontal scanning period of interlaced scanning or every period shorter than the horizontal scanning period, and this is sent out as the detection output DO, and the clear pulse The register 22 is cleared in response to CLR, and the above-described operation is resumed as the clear pulse CLR disappears.

The output of the register 22 is the accumulated value of the luminance difference signal ΔYd, and is in an integral state, so the luminance difference signal ΔY
The noise component in d is reduced, and false detection due to sudden noise is prevented.

FIG. 3 is a block diagram of a case where the same function as in FIG. 2 is realized by a delay element, and includes multiple registers each storing and transmitting data with a time difference corresponding to one period of a sampling clock pulse. 318-31d
are connected in series, and the luminance difference signal ΔY is sent to these input sides.
d, and there is a delay equivalent to one sampling period between the input and output of registers 318 to 31d.
Each output of 31d ((weighted by coefficients h1 to h5, respectively, is added by an adder 32 via coefficient units 331 to 335, similar to the example in which a clear pulse is generated every 5 samples in Fig. 2). As a result, the detection output Do can be obtained from the addition output.

FIG. 4 is a block diagram of an embodiment for detecting motion information from a sample image as shown in FIG. The luminance difference signal ΔYd is applied to these inputs 1111, and a register 41 connected in series is connected via a memory 43 that applies a delay corresponding to the period of one scanning line of interlaced scanning (hereinafter referred to as H).
The luminance difference signal ΔYd is applied to registers 44a and 44b similar to those of memory 43 and 412 and 41b.
A luminance difference signal ΔYd delayed by IH is applied to a series circuit consisting of registers 468 to 48d similar to the memory 46b, and the output of the register 46b is sent to a memory 47a similar to the memory 43,
47b to the serial circuit, and register 41b.
, 44b, 46b, memory 47a, 47btD each output u
The weighting by multiplying each coefficient by 1 to 5 is done by the coefficient unit 51.
55 and is added by an adder 48, and the memory 45
．． Each output of the registers 46a146C and 146d is weighted by multiplying coefficient 19 by 6 to 9 by coefficient units 56 to 59.
and then added by an adder 49. Furthermore, these respective addition outputs are added by an adder 50, and this addition output is sent out as a detection output DO.

There is a time difference corresponding to IH between the input and output of Kono&a6, memory 43, 45, 47a, and 47b, and register 4Ta+4
A time difference corresponding to one sampling cycle is created between each input and output of 1b, 44a, 44b+46a748d,
Each output added by the adders 48 and 49 is Pl-P9.
Then, each sampling point Pl in FIG. 5 indicating the scanning line
-Po corresponds to the reference point PO in FIG. 5, and the inputs to the register 41a and the memory 43 correspond to the reference point PO in FIG.

Therefore, the output of the adder 50 includes each luminance difference signal value at a plurality of mutually adjacent sampling points P8 to P7 on the scanning line Sa, and each scanning line located before and after the scanning 1fi S8. Sampling points P8 to P? on Si, Sz, S+, Sr+? P5 located in the center of
Each sampling point P11P2 of the corresponding part. P8.
A value is obtained by adding each luminance difference signal value at P9,
This indicates the movement of the image.15 Incidentally, accumulation is performed in the same way as in Figures 2 and 3, and false detection is prevented by removing noise components. Objects are visually sharp in the horizontal direction n+1
In contrast, the one in Figure 4 detects not only the horizontal direction but also the vertical direction! The detection status is more accurate because it also detects the movement.

In Fig. 2, a memory or the like may be used instead of the register, and in Figs. 3 and 4, a delay line such as an ultrasonic delay line or a COD may be used instead of the register and memory. However, the number and position d of each sampling point can be determined according to the maximum moving area of the screen, and the brightness; Various modifications are possible, such as being configured by a circuit and using an inter-frame color difference signal instead of a single-frame difference signal.

Furthermore, regarding the synthesis of signals related to the inter-frame difference signals corresponding to each sample point, the inter-frame difference signals (including signals in which part of the signal processing has been applied to the U signal) are also included.

In the case of the pure summation of these signals, synthesis requires extracting the 7Nf band necessary for motion information and realizing low-pass filtering characteristics that effectively removes unnecessary bands beyond that (noise, etc.). In the case of a weighted combination of direct i! There is an example of symmetric weighted synthesis to obtain 1g1 place 4d.

For example, each coefficient unit 331 to 331 in FIG. 3 and FIG.
335 and 51 to 59 have their coefficients h 1 = h
2-...h5=l, kx=kz-...
...kg-1, the processing is a simple summation, and in the example of Fig. 3, h 1 = ll 5. h2=h
4, and in the example of FIG. 4, kl=5. 9 = 4. 6 =
9, when kt=ka, the process forms a phase linear filter.

In addition, the input signal only needs to be an inter-frame difference signal that includes the required motion information in its low-frequency components, and although the inter-frame luminance difference signal has characteristics as motion information and is suitable for upper signal processing layers, inter-frame composite The difference signal may be used as the input signal.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an example of application of the present invention, FIGS. 2 and 3 are block diagrams of an embodiment of the main part of the invention, and FIG. 4 is a block diagram of the main part of another embodiment of the invention. FIG. 5 is a diagram showing sampling points on the scanning line in correspondence with the bacteria diagram 4. 21.32.48,49.5() @ Adder, 22
．． 23.31a to 31d, 41a, 41b, 44a,
44b, 46a to 46d...delay device (register),
43゜” + 47 a + 47 b * e e
m memory, ΔYd --. - Luminance difference signal, P1 to P9... sampling points. Figure 1 Figure 2 Figure 3

Claims (2)

[Claims] (1) Based on the correlation between frames and between scanning lines,
In a device that converts an interlaced scanning video signal into a progressive scanning video signal, all interframe difference signals are input, and the current sampling point on the screen and multiple sampling points symmetrical and close to the sampling point are The feature is that the motion information of the video signal corresponding to the current sampling point is generated by extracting and combining signals related to the interframe difference signal using a plurality of delay devices corresponding to the time difference between the sampling points. mh information detection method for images. (2) Signals related to the inter-frame difference signals at each sample point are weighted and combined so as to form a low-frequency wave filter having a linear phase and a predetermined frequency characteristic with respect to the current sample point. An image motion information detection method according to claim 1.