JP2006133052A - Foreign matter inspection method and device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a foreign matter measuring method and a device capable of improving inspection accuracy of the foreign matter, and reducing the load of an inspector. <P>SOLUTION: When detecting an intermingled foreign matter in an inspection object on a conveyor by image processing of a camera arranged over the conveyor, an illumination for irradiating the inspection object M from above is constituted of a coaxial illumination part 21 which is approximately coaxial B with an imaging shaft A of the camera 10, a reflection illumination part 25 by an approximately hemispherical reflecting surface 27 of a reflection part 26 formed over the conveyor 6, and a direct illumination part 29 from a lower part of the reflection part 26, to thereby put at least a surface part of the inspection object M into a shadeless state. Illumination light from each illumination part 21, 25, 29 is irradiated in the state where each color of RGB and UV can be combined in order to actualize the foreign matter according to the kind of the foreign matter, and an infrared light illumination 31 comprising LED's 32 arranged kin a matrix form is arranged under the conveyor 6, and inspection is performed by irradiating the inspection object M with infrared light through the conveyor 6. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a foreign matter inspection method and apparatus for detecting foreign matter mixed in an inspection object.

  In general, an X-ray inspection is performed in order to detect foreign matter mixed in an inspection object in which food or the like is packaged. This X-ray inspection detects foreign matters (iron powder, plastics, etc.) mixed in the inspection object based on an image obtained by X-rays transmitted through the inspection object (see Patent Document 1).

  As another inspection method, there is a method for detecting foreign matter mixed in an inspection object based on an image taken by irradiating light from above the inspection object.

However, in this X-ray inspection, an image obtained by transmission of X-rays is not clear depending on the type of foreign matter, and in particular, foreign matters such as hair and insects cannot be detected. Further, the method of detecting a foreign object by irradiating light from the upper part of the inspection object makes it difficult to detect a mixed foreign object due to irregular reflection caused by the packaging of the inspection object. In the conventional inspection method, inspection of foreign matters such as hair and insects is made by visual observation, and the inspection accuracy is lowered due to oversight or the inspector feels a burden.
JP 2000-39407 A

  The present invention has been proposed in view of such circumstances, and an object thereof is to provide a foreign matter inspection method and apparatus that improve the inspection accuracy of foreign matters such as hair and insects and reduce the burden on the inspector. To do.

  That is, in the invention of claim 1, when detecting the foreign matter mixed in the inspection object on the conveyor by the image processing of the camera arranged above the conveyor, the illumination for irradiating the inspection object from above is set as the imaging axis of the camera. At least a surface portion of the object to be inspected is configured by a substantially coaxial coaxial illumination portion, a reflection illumination portion formed by a substantially hemispherical reflection surface of a reflection portion formed above the conveyor, and a direct illumination portion from the lower portion of the reflection portion. According to the foreign matter inspection method, the illumination light from each of the illumination units is irradiated in such a manner that each color of RGB and UV can be combined in order to make the foreign matter appear in accordance with the kind of the foreign matter. .

  In the invention of claim 2, when detecting foreign matters mixed in the inspection object on the conveyor by image processing of a camera arranged above the conveyor, infrared light illumination composed of LEDs arranged in a matrix is arranged below the conveyor. Then, the present invention relates to a foreign matter inspection method, wherein the inspection object is irradiated with the infrared light through the conveyor and inspected.

  According to a third aspect of the present invention, the illumination for irradiating the inspection object from above is substantially coaxial with the imaging axis of the camera when detecting foreign matter mixed in the inspection object on the conveyor by image processing of a camera disposed above the conveyor. A coaxial illumination part, a reflection illumination part formed by a substantially hemispherical reflection surface of the reflection part formed above the conveyor, and a direct illumination part from the lower part of the reflection part, so that at least the surface part of the object to be inspected is shaded In addition, the illumination light from each of the illuminating units irradiates each color of RGB and UV so as to be able to be combined according to the type of the foreign matter, and is arranged in a matrix form below the conveyor. The present invention relates to a foreign matter inspection method characterized in that infrared light illumination composed of LEDs is disposed, and the inspection object is irradiated with the infrared light through the conveyor and inspected.

  The invention of claim 4 relates to a foreign matter inspection method according to claim 1, wherein the object to be inspected is pudding.

  The invention of claim 5 relates to a foreign matter inspection method according to claim 1 or 3, wherein the foreign matter mixed in the object to be inspected is hair.

  According to a sixth aspect of the present invention, there is provided an apparatus for inspecting foreign matters mixed in an object to be inspected on a conveyor, an image pickup unit arranged above the conveyor to pick up an inspection image of the object to be inspected, and an image pickup axis of the image pickup means. The object to be inspected is irradiated from above by a coaxial coaxial illumination unit, a reflection illumination unit formed by a substantially hemispherical reflection surface of a reflection unit formed above the conveyor, and a direct illumination unit from the lower part of the reflection unit. In order to make illumination at least the surface part of the object to be inspected by constituting illumination and to illuminate the object from above, the RGB light and UV are used to make the object appear according to the type of the object. Upper illumination means for irradiating in a combinable manner, lower illumination means arranged below the conveyor, passing through the conveyor and irradiating the inspection object with infrared light, and the object to be inspected based on the inspection image Inspected According to the foreign matter inspection apparatus characterized by having a determining means for determining whether the incoming foreign object.

  The invention of claim 7 relates to the foreign matter inspection apparatus according to claim 6, wherein the determination means binarizes the inspection image and compares it with a predetermined threshold value.

  The invention of claim 8 relates to a foreign matter inspection apparatus according to claim 6 or 7, wherein the determination means identifies a linear image.

  According to the foreign matter inspection method of the first aspect of the present invention, when detecting foreign matter mixed in the inspection object on the conveyor by image processing of a camera disposed above the conveyor, the illumination for irradiating the inspection object from above is An object to be inspected comprising a coaxial illumination unit that is substantially coaxial with the imaging axis of the camera, a reflection illumination unit formed by a substantially hemispherical reflection surface of a reflection unit formed above the conveyor, and a direct illumination unit from the lower part of the reflection unit Since the illumination light from each of the illuminating portions is irradiated in such a manner that each color of RGB and UV can be combined in order to reveal the foreign matter according to the type of the foreign matter. It is possible to make the image of the foreign object clear by illuminating at least the surface part of the object to be inspected by the illumination light that can prevent and combine each color of RGB and UV, and the inspection accuracy of the foreign object It can also be improved.

  According to the foreign matter inspection method of the second aspect of the invention, when detecting the foreign matter mixed in the inspection object on the conveyor by the image processing of the camera arranged above the conveyor, from the LEDs arranged in a matrix form below the conveyor Infrared light illumination is arranged, and the inspection object is irradiated with the infrared light and inspected by the infrared light. It can be made clear and the inspection accuracy of foreign matters can be improved.

  According to the foreign matter inspection method of the third aspect of the present invention, when detecting the foreign matter mixed in the inspection object on the conveyor by image processing of a camera arranged above the conveyor, the illumination for irradiating the inspection object from above is described above. An object to be inspected comprising a coaxial illumination unit that is substantially coaxial with the imaging axis of the camera, a reflection illumination unit formed by a substantially hemispherical reflection surface of a reflection unit formed above the conveyor, and a direct illumination unit from the lower part of the reflection unit In addition, the illumination light from each of the illuminating units irradiates each of the RGB colors and UV in a combined manner in order to reveal the foreign matter according to the type of the foreign matter, Infrared illumination consisting of LEDs arranged in a matrix at the bottom is arranged, and the object is inspected by passing through the conveyor and irradiating the object with the infrared light. From above and below the Gutotomoni conveyor is irradiated with light to free Kageka at least the surface portion of the specimen image can sharpen it, it is possible to improve the inspection accuracy of the foreign matter.

  According to the invention of claim 4, since the object to be inspected is pudding according to claim 1, printing is performed by irradiating from above the illumination light that can prevent irregular reflection and can combine RGB colors and UV. The image of the foreign matter can be made clear by making at least the surface portion of the image clear, and the foreign matter mixed in the pudding can be detected with high accuracy.

  According to the invention according to claim 5, in claim 1 or 3, since the foreign matter mixed in the object to be inspected is hair, an image of the foreign matter is obtained by irradiating light from above the conveyor or from above and below the conveyor. The hair can be detected clearly with high accuracy.

  According to the foreign matter inspection apparatus according to the invention of claim 6, in the device for inspecting the mixed foreign matter in the inspection object on the conveyor, the imaging means that is arranged above the conveyor and images the inspection image of the inspection object, A coaxial illumination unit that is substantially coaxial with the imaging axis of the imaging unit, a reflection illumination unit formed by a substantially hemispherical reflection surface of a reflection unit formed above the conveyor, and a direct illumination unit from the lower part of the reflection unit. In order to make the illumination to irradiate the inspection object from the upper part and to make at least the surface part of the inspection object non-shadowed, and to make the illumination light to irradiate the inspection object from the upper part according to the type of the foreign object An upper illumination means for irradiating each color of RGB and UV in a combinable manner, a lower illumination means for irradiating infrared light to the object to be inspected by being disposed below the conveyor and passing through the conveyor, Inspection image And determining means for determining the presence or absence of foreign matter in the inspected object based on the above, preventing irregular reflection and irradiating light from above and below the conveyor to make at least the surface portion of the inspected object shadowless and image Therefore, the foreign matter inspection apparatus can improve the foreign matter inspection accuracy and reduce the burden on the inspector.

  According to the invention according to claim 7, in claim 6, the determination means binarizes the inspection image and compares it with a predetermined threshold value, so that the foreign matter mixed in the inspection object becomes clear. Inspection accuracy can be improved.

  According to the eighth aspect of the invention, in the sixth or seventh aspect, since the determination means identifies a linear image, linear foreign matters such as hair can be detected effectively.

  Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a schematic side view of an embodiment of the foreign matter inspection method according to the present invention in which illumination light capable of combining RGB colors and UV is irradiated from the upper part of an inspection object, and FIG. 2 is infrared light from the lower side of the inspection object. 3 is a schematic side view of an embodiment in which light is irradiated from above and below the object to be inspected, and FIG. 4 is a schematic configuration diagram of a foreign substance inspection apparatus according to an embodiment of the present invention. It is.

  In the foreign matter inspection method according to the first aspect of the present invention, the foreign matter mixed in the inspection object on the conveyor is detected by image processing of a camera arranged above the conveyor. In this foreign matter inspection method, the illumination for irradiating the object to be inspected from above is constituted by a coaxial illumination part, a reflective illumination part, and a direct illumination part, and at least the surface part of the object to be inspected is made shadowless. .

  FIG. 1 shows an embodiment of this foreign matter inspection method. As shown in the figure, the coaxial illumination unit 21 irradiates illumination light to the object M to be inspected substantially coaxially B with the imaging axis A of the camera 10. Reference numeral 22 denotes a polarizing lens.

  The reflection illumination unit 25 is composed of a substantially hemispherical reflection surface 27 of the reflection unit 26 formed above the conveyor 5. The reflection illumination unit 25 reflects the illumination light from the light emitter 28 to the reflection surface 27 and irradiates the inspection object M from the C direction. The light emitters 28 are arranged circumferentially.

  The direct illumination unit 29 irradiates the inspection object M with illumination light from below the reflection unit 26. As shown in the figure, the direct illumination unit 29 irradiates the inspection object M with the illumination light from the D direction. The direct illumination unit 29 is arranged so as to irradiate the inspection object M from all directions with illumination light.

  The inspected object M is irradiated with illumination light from the B direction or the D direction by the illumination units 21, 25, and 29. As a result, at least the surface portion of the inspection object M can be made non-shadowed.

  Further, as shown in the figure, this foreign matter inspection method irradiates illumination light from each illumination unit 21, 25, 29 in such a manner that each color of RGB and UV can be combined in order to reveal the foreign matter according to the type of foreign matter. To do.

  The inspected object M is irradiated with illumination light capable of combining RGB (red, green, blue) colors and UV (ultraviolet rays) from the B direction or the D direction by the illumination units 21, 25, 29. Here, an appropriate illumination color can be obtained by combining three types of LEDs (red, green, and blue), a known ultraviolet LED, and a known dimmer. The illumination light prevents diffuse reflection and sharpens the image of the foreign matter mixed in the inspection object M. The inspection object M is imaged by irradiating illumination light, and image processing is performed to detect mixed foreign matter. Reference numeral M1 is an object to be inspected before inspection, M2 is an object to be inspected after inspection, and S is a sprocket.

  In the embodiment, the inspection object M is a mozuku housed in a plastic container. Mozuku is irradiated with UV (ultraviolet rays) from the B direction or the D direction by the illuminators 21, 25, and 29. Thereby, irregular reflection can be prevented and the image of the foreign matter mixed in can be made clear. The mozuku is not limited to UV (ultraviolet rays), and the RGB color is appropriately combined or the RGB color and the UV are appropriately combined to inspect the image of the contaminated foreign matter.

  In the embodiment, the inspection object M is a pudding as defined in the invention of claim 4. By illuminating from the top with illumination light that can combine RGB colors and UV, at least the surface part of the pudding can be made shadowless and the image of the foreign matter can be sharpened. Can be detected. Here, foreign matters (hair and insects) present on the surface of the pudding were detected by irradiating red illumination light.

  In the embodiment, as defined as the invention of claim 5, it is possible to detect the hair mixed in the inspection object M. Here, the inspection object M is a hijiki placed in a plastic container. The foreign matter inspection method of the embodiment can irradiate white illumination light from above the conveyor 5 to make the hair image clearer, and can detect the hair present on the surface of the hijiki.

  In the foreign matter inspection method according to the second aspect of the present invention, when detecting foreign matter mixed in an object to be inspected on a conveyor by image processing of a camera arranged above the conveyor, red consisting of LEDs arranged in a matrix form below the conveyor Outside light illumination is arranged, and the inspection object is irradiated with the infrared light through the conveyor and inspected.

  As illustrated in FIG. 2, the infrared light illumination 31 is disposed below the conveyor 6. The conveyor 6 can transmit infrared light. The infrared illumination 31 is emitted from the LEDs 32 arranged in a matrix. In the embodiment, the inspection object M is a walnut housed in a plastic container. The same devices as those in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted.

  Infrared light is irradiated only through the conveyor 6 and the plastic container. As a result, foreign matters (for example, walnut shells) mixed in the case can be made clear. The walnut is imaged by irradiating with infrared light, and image processing is performed to detect a foreign substance.

  In the foreign matter inspection method according to the invention of claim 3, when detecting foreign matter mixed in the inspection object on the conveyor by image processing of a camera disposed above the conveyor, the illumination for irradiating the inspection object from above is performed on the camera. Consists of a coaxial illumination unit that is substantially coaxial with the imaging axis, a reflected illumination unit formed by a substantially hemispherical reflection surface of a reflection unit formed above the conveyor, and a direct illumination unit from the lower part of the reflection unit. In addition to making the surface non-shadowed, the illumination light from each of the illuminating units irradiates the respective colors of RGB and UV so as to make the foreign matter appear depending on the type of the foreign matter, and below the conveyor Infrared light illumination composed of LEDs arranged in a matrix is disposed, and the inspection object is irradiated with the infrared light through the conveyor and inspected.

  As shown in FIG. 3, the inspection object M is conveyed by the conveyor 6 and moves to the inspection position P 1. The inspection object M is directly directed by the illumination unit 29 from the B direction substantially coaxial with the imaging axis A of the camera 10 by the coaxial illumination unit 21 and from the C direction reflected by the reflection illumination unit 25 on the substantially hemispherical reflecting surface 27. Illumination light is irradiated from the D direction. Here, each illumination part 21 and 29 and the light-emitting body 28 irradiate the to-be-inspected object M with the illumination light which can combine each color of RGB and UV with a well-known dimmer. The illuminating light prevents diffuse reflection and allows the combination of RGB colors and UV to make the image of foreign matter mixed in the inspection object M clear.

  In this foreign matter inspection method, the inspection object M is irradiated with infrared light by the infrared light illumination 31. Here, infrared light is irradiated by the LEDs 32 arranged in a matrix. This infrared light is transmitted through the conveyor 6 and the container for the inspection object M, and is irradiated to make a clear image of the foreign matter mixed in the inspection object M. As shown in the figure, the inspection object M is imaged by irradiating light from above and below the conveyor 6, and image processing is performed to detect mixed foreign matters. This foreign matter inspection method can irradiate light from above and below the conveyor 6 to prevent irregular reflection, and at least the surface portion of the inspection object can be made shadowless so that the image is clear and mixed into the inspection object M. Foreign matter can be detected with high accuracy. The same devices as those in FIG. 1 and FIG.

  As defined in the invention of claim 5, the foreign matter inspection method of the embodiment can detect hair mixed in the inspection object M. Here, the inspection object M is dumplings that are put in a plastic container and wrapped by wrapping. This foreign matter inspection method irradiates red illumination light from above the conveyor 6 and infrared light from below the conveyor 6 to prevent irregular reflection and to make the surface of the dumplings shadowless so that the hair image is clear. The hair existing on the surface of the dumpling can be detected with high accuracy.

  Next, a foreign substance inspection apparatus that performs the above-described inspection method will be described. As shown in FIG. 4 and defined as the invention of claim 6, the foreign matter inspection apparatus 1 includes an imaging unit 10, an upper illumination unit 20, a lower illumination unit 30, and a determination unit 40.

  The imaging means 10 is arranged above the conveyor 6 as shown in the figure. The image pickup means 10 picks up an inspection image obtained by irradiating the inspection object M with light by the upper illumination means 20 and the lower illumination means 30. In the embodiment, the imaging means 10 is constituted by a known CCD camera. Here, the inspection accuracy of the foreign matter mixed in the inspection object M is improved by using a CCD camera having 2 million images or 4 million pixels.

  The light reflected or transmitted to the inspection object M reaches the imaging means 10 via the polarizing lens 22 and is detected. The imaging unit 10 captures the detected image as an inspection image. This inspection image becomes clear by the illumination means 20 and 30. Thereby, the inspection accuracy of the foreign matter mixed in the inspection object M is improved.

  The upper illumination means 20 constitutes illumination for irradiating the inspection object M from above to make at least the surface portion of the inspection object M shadowless, and the illumination light for irradiating the inspection object from above according to the type of foreign matter In order to make the foreign matter appear, the respective colors of RGB and UV are irradiated so that they can be combined. The upper illumination means 20 is composed of the coaxial illumination unit 21, the reflection illumination unit 25, and the direct illumination unit 29.

  The coaxial illumination unit 21 according to the embodiment includes three types (red, green, and blue) of LEDs and a known ultraviolet LED, and the illumination light is substantially coaxial with the imaging axis A of the imaging unit 10 with respect to the inspection object M. B is irradiated.

  The reflective illumination part 25 of an Example is formed with a dome-shaped metal member. The reflection illumination unit 25 is composed of a substantially hemispherical reflection surface 27 of the reflection unit 26 formed above the conveyor 6, and reflects the illumination light from the light emitter 28 to the reflection surface 27 and causes the object M to be inspected. Irradiate from the C direction. The light emitter 28 is composed of the three types of LEDs and a known ultraviolet LED, and is arranged circumferentially.

  The direct illumination unit 29 according to the embodiment is configured by the three types of LEDs and a known ultraviolet LED, and irradiates the inspection object M with illumination light from the lower portion of the reflection unit 26. Here, each LED is arrange | positioned so that illumination light may be irradiated with respect to the to-be-inspected object M from all directions (D direction).

  The inspection object M is placed on the conveyor 6 from the carry-in portion 8 and moves to the inspection position P. The inspection object M is located at the inspection position P and irradiated with illumination light by the upper illumination means 20. Thereby, irregular reflection can be prevented. The illumination light is changed so that at least the surface portion of the inspection object M is made shadowless by a dimmer whose illumination color is known. This illumination light can change the illumination color as appropriate according to the object to be inspected, and can also sharpen the image of the foreign matter.

  The lower illumination means 30 is disposed below the conveyor 6 and passes through the conveyor 6 to irradiate the inspection object M with infrared light. In the embodiment, the lower illumination means 30 is composed of LEDs 32 arranged in a matrix below the conveyor 6 and irradiates infrared light. Here, about 10,000 LEDs 32 are arranged. Reference numeral 31 denotes infrared light illumination.

  The inspection object P at the inspection position P is irradiated with infrared light transmitted through the conveyor 6 by the LED 32. The infrared light sharpens foreign matter mixed in the inspection object M. For example, when the object to be inspected M is a dumpling wrapped in a plastic container and wrapped in a wrap, infrared light passes through the container and erases the shadow of the dumpling, thereby clarifying the contaminated foreign matter. The intensity of the infrared light is automatically adjusted according to the inspection object M.

  The determination means 40 determines the presence or absence of foreign matter mixed in the inspection object M based on the inspection image. In the embodiment, the determination unit 40 is configured by a known image processing apparatus.

  The determination means 40 receives the inspection image signal through the signal line S1. The determination unit 40 performs processing so as to enhance the image of the mixed foreign matter. This image processing is performed by a program input to the determination means 40. This program is designed so that each foreign object can be detected by trial using an inspection object mixed with various foreign objects. Reference numeral 50 is an image display device (monitor), and S2 is a signal line. The inspector can confirm the emphasized foreign object image by the image display device 50, and the burden of the inspection is reduced.

  As defined in the invention of claim 7, the determination means 40 of the embodiment binarizes the inspection image and compares it with a predetermined threshold value. The determination unit 40 binarizes so that the image of the foreign object is dark and the other image is lighter than the foreign object image. As a result, the foreign matter becomes clear and the inspection accuracy can be improved. This determination means 40 compares the binarized image with a predetermined threshold value and determines that the dark image is a foreign object.

  Furthermore, the determination means 40 identifies a linear image as prescribed | regulated as invention of Claim 8. The determination unit 40 identifies a linear image when binarizing the inspection image. In this embodiment, the determination unit 40 can identify and effectively detect a foreign object (hair or fishing line) as a linear image. The determination means 40 can also increase the inspection accuracy of the foreign matter by increasing the contrast of the inspection image by differential processing.

  The inspection object M in which the foreign matter is detected is discharged from the conveyor 6 by a known automatic discharge device. On the other hand, the inspection object M2 from which no foreign matter has been detected is conveyed by the conveyor 6 and taken out from the carry-out section 9.

  In this embodiment, as shown in Table 1, the foreign matter inspection apparatus 1 can detect various foreign matters by appropriately adjusting the illumination color applied to the inspection object M from above.

It is a schematic side view of the Example which irradiates the illumination light which can combine each color of RGB and UV from the upper part of a to-be-inspected object among the foreign material inspection methods of this invention. It is a schematic side view of the Example which irradiates infrared light from the downward direction of a to-be-inspected object. It is a schematic side view of the Example which irradiates light from the upper part and lower part of a to-be-inspected object. It is a schematic block diagram of the foreign material inspection apparatus which concerns on one Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Foreign material inspection apparatus 5,6 Conveyor 10 Imaging means (camera)
DESCRIPTION OF SYMBOLS 20 Upper illumination means 21 Coaxial illumination part 25 Reflection illumination part 26 Reflection part 27 Substantially hemispherical reflective surface 29 Direct illumination part 30 Lower illumination means 31 Infrared light illumination 32 LED
40 judgment means

Claims (8)

When detecting foreign matter mixed in the inspection object on the conveyor by image processing of the camera arranged above the conveyor,
Illumination for irradiating the object to be inspected from above is performed from the coaxial illumination part substantially coaxial with the imaging axis of the camera, the reflection illumination part by the substantially hemispherical reflection surface of the reflection part formed above the conveyor, and from the lower part of the reflection part In order to make at least the surface part of the inspection object non-shadowed by the direct illumination part, and the illumination light from each of the illumination parts makes each color of RGB and A foreign matter inspection method characterized by irradiating UV in a combinable manner. When detecting foreign matter mixed in the inspection object on the conveyor by image processing of the camera arranged above the conveyor,
Infrared illumination comprising LEDs arranged in a matrix form is disposed below the conveyor, and the foreign matter is inspected by passing through the conveyor and irradiating the inspection object with the infrared light. Inspection method. When detecting foreign matter mixed in the inspection object on the conveyor by image processing of the camera arranged above the conveyor,
Illumination for irradiating the object to be inspected from above is provided from a coaxial illumination part that is substantially coaxial with the imaging axis of the camera, a reflective illumination part by a substantially hemispherical reflection surface of a reflection part formed above the conveyor, and In order to make at least the surface part of the inspection object non-shadowed by the direct illumination part, and the illumination light from each of the illumination parts makes each color of RGB and While irradiating UV in a combinable way,
Infrared illumination consisting of LEDs arranged in a matrix form is disposed below the conveyor, and the object is inspected by passing through the conveyor and irradiating the object with the infrared light. Inspection method.   The foreign matter inspection method according to claim 1, wherein the inspection object is pudding.   The foreign matter inspection method according to claim 1 or 3, wherein the foreign matter mixed in the inspection object is hair. In a device for inspecting foreign matter mixed in objects to be inspected on a conveyor,
An imaging means for imaging an inspection image of an object to be inspected by placing it above the conveyor;
By the coaxial illumination part substantially coaxial with the imaging axis of the imaging means, the reflection illumination part by the substantially hemispherical reflection surface of the reflection part formed above the conveyor, and the direct illumination part from the lower part of the reflection part, The illumination that irradiates the inspection object from above is configured to make at least the surface portion of the inspection object shadowless, and the illumination light that irradiates the inspection object from above is made to manifest the foreign object according to the type of the foreign object. Therefore, the upper illumination means for irradiating each color of RGB and UV in a combinable manner,
A lower illumination means arranged below the conveyor and irradiating the inspection object with infrared light through the conveyor;
A foreign matter inspection apparatus comprising: determination means for determining the presence or absence of foreign matter mixed in the inspection object based on the inspection image.   The foreign matter inspection apparatus according to claim 6, wherein the determination unit binarizes the inspection image and compares it with a predetermined threshold value.   The foreign matter inspection apparatus according to claim 6 or 7, wherein the determination unit identifies a linear image.

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