JP2001041894A - Apparatus and method for inspecting sheet package - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply detect all of important flaws including the flaw in a pocket part with high probability. SOLUTION: A light source 3 and a two-dimensional sensor are provided above a packaging sheet 1 and a means 2 for inputting a reflected image is provided above the packaging sheet 1 while a light source 5 is provided under the packaging sheet 1 and a means 4 for inputting the transmitted image of the packaging sheet 1 is provided. The reflected image and the transmitted image are respectively binarized or multi-valued to calculate a plurality of binary or multi-valued images and a code distribution image representing the gray level distribution of a plurality of the images is formed and, thereafter, the flaws such as mixed foreign matter damage or staining in a part, the packaging sheet and a pocket part are detected from the code distribution image.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet packaging inspection apparatus and an inspection method for non-contact detection of foreign matter, damage and dirt generated during a tablet sheet packaging process by a visual inspection, and more particularly to reflected light and transmitted light. The present invention relates to an inspection apparatus and an inspection method for observing and inspecting with a television camera using both light.

[0002]

2. Description of the Related Art In this specification, the term "tablet inspection" refers to inspection of tablets and packaging sheets and inspection for defects such as foreign substances mixed in a space where tablets are placed, so-called pockets, unless otherwise specified. Will be used as a generic term including Unless otherwise specified, the term "sheet packaging inspection" is used as a general term including inspection of parts to be packaged and packaging sheets and inspection of defects such as foreign substances mixed in a space where parts called so-called pockets are placed. It shall be. Unless otherwise specified, the entire inspection target including the tablet and other parts and the sheet part that wraps it is simply referred to as a “packaging sheet”, and the sheet part consisting of only the sheet is used.
To be distinguished.

Hereinafter, a conventional tablet inspection which is important as one of inspections of a sheet package will be described. The inspection area in the tablet inspection is roughly divided into a tablet portion, a packaging sheet portion, and a portion commonly called a pocket for placing and securing the tablet. As inspection items, tablet shape, tablet shape,
Character symbols, cracks, cracks, folds, chips, dirt, stains, and deposits on the tablet surface. Further, the packaging sheet and the pocket portion include spots, dirt, foreign matter which is easily generated in the packaging process, tablet fragments, hair and fibers, and the like. In addition, foreign tablets may be mixed. On the other hand, as the inspection method, conventionally, a method called a reflection type and a method called a transmission type have been separately considered. The reflection type is a method of irradiating light from above the packaging sheet and detecting the defect by observing with a television camera placed above. This is a method for detecting defects by observing transmitted light with a television camera. In the reflection type inspection, it is possible to inspect the tablet shape, foreign substances on the tablet portion, and foreign substances mixed in the sheet. On the other hand, the transmission type is used for detecting a foreign substance mixed in a sheet and detecting a tablet shape.

[0004]

As described above, conventionally, two types of tablet inspection methods, a reflection type and a transmission type, have been considered. However, these methods have the following important problems. First, in the reflection method, highlights are often observed in pocket portions due to multiple reflection and specular reflection of light and a concave reflecting mirror effect, and the highlights are false defects. For this reason, the pocket portion is detected in advance, and the corresponding area on the image is logically masked and excluded from the inspection target. Therefore, the detection of the pocket part becomes complicated and the inability to inspect the pocket part is a serious problem. There is also a considerable specular reflection component on the sheet surface, which may appear as a highlight. Highlights appearing in such pockets and seats can cause serious false defects,
Conventionally, there is no method for identifying and removing only the false defect. Next, regarding the transmission method, an elongated foreign substance such as hair has a very low contrast in a transmission image due to a diffraction phenomenon or the like, which causes a serious omission of defect detection. Further, it is not possible to make an important distinction as to whether the defect mixed in the sheet is a tablet fragment generated due to tablet damage or a foreign substance due to dust. As described above, it is not possible to stably identify and detect all important defects including all defects in both the reflection type inspection and the transmission type inspection. Furthermore, it is impossible at all to detect all defects with high probability in all regions simply by combining both methods. Therefore, an object of the present invention is to solve these conventional problems and provide a sheet packaging inspection apparatus and an inspection method that can easily detect all important defects including defects in the pocket portion with a high probability. To provide.

[0005]

In order to achieve the above object, a sheet packaging inspection apparatus according to the present invention comprises a light source and a two-dimensional sensor above a packaging sheet, and means for inputting a reflection image from above the packaging sheet. Means for inputting a transmission image of the packaging sheet below the packaging sheet, and binarizing or multi-leveling the reflection image and the transmission image to form a plurality of binary or multi-valued images. Then, a code distribution image representing the density distribution of the plurality of images is generated, and thereafter, from the code distribution, defects such as contaminants, damage, and dirt in parts, packaging sheets, and pockets are detected. Also disclosed is a method of performing a logical operation between images instead of adding a code and identifying a defect from the result. Further, region division is performed based on the density distribution of the input image or the code distribution, and thereafter, the code value of each divided region is added to the code value of the peripheral region of the region as an auxiliary code, Detect defects. Further, in order to avoid omission of defect detection, a half mirror or a reflector having a reflection component of at least 5% or more is provided immediately below the packaging sheet. On the other hand, in order to enhance the inspection efficiency, the lighting means simultaneously equipped with light sources having different color distribution emission characteristics above and below the packaging sheet, or the light sources are simultaneously arranged above and below the packaging sheet, and each of the light sources An illuminating means having a color filter having a different color distribution is arranged between the wrapping sheet and a two-dimensional sensor is arranged above the wrapping sheet, and thereafter, two directions above and below the wrapping sheet. A two-dimensional image is input while the light source is turned on, and in the input image, the reflected image component is made to correspond to the color distribution of the illumination light from above the packaging sheet, and the transmitted image component is the color of the illumination light from below. Means are provided for separating the reflected image and the transmitted image from the input image by making them correspond to the distribution. Further, a color filter containing components common to the transmission wavelength components is provided above and below the packaging sheet, and the common wavelength components of the illumination light from above and below are removed from the input image. And the transmitted image component. In addition, as a new method of detecting defects without separating the reflected image component and the transmitted image component, a dimming device is used to adjust the ratio of the amount of reflected light and the amount of transmitted light, input an image, and perform multi-value processing. Detect defects.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings. 2 and 3 are a plan structural view and a side sectional view of a packaged tablet to be tested according to the present invention. Generally, a packaged tablet contains several tablets of several mm.
The tablets are arranged at intervals of 10 to several mm, but one tablet T is shown in FIG. 2 for simplicity. FIG. 2 is a plan view when the packaged tablet T is viewed from above together with the pocket P. FIG. 3 shows a cross section of the pocket portion, and the tablet T is in a pocket P. In the packaging process, as shown in FIG.
One tablet T is placed in a concave portion of the sheet S called a pocket, and then another sheet S is attached to the upper surface as shown in FIG. This sheet S is also called a seal and is distinguished from the sheet S shown in FIG. 3A, but in this embodiment, both are called sheets and are not particularly distinguished. Also,
The inspection target areas shown in FIGS. 3A and 3B are both called packaging sheets. Fig. 3
This is performed in the states of (a) and (b). The position of the camera may be located either above or below FIG. In the example,
The camera was placed on the upper side, and as for (b), the packaging sheet S was turned upside down as shown in (c). In the inspection method, the position of the camera and the orientation of the packaging sheet S are treated as arbitrary.

FIG. 4 is an explanatory diagram showing types of defects.
Here, a false defect in the pocket portion is also shown. The tablet portion T is white in this embodiment. F
Are highlights caused by multiple reflections of light in the pocket, concave mirror efficiency, and specular reflection on the sheet surface, and particularly appear in pockets with high probability under ordinary lighting. J1 is a chipped portion on the side of the tablet, and J2 is a crack in the tablet. G1 is a white-system defect, which corresponds to a tablet fragment attached to the tablet. These are often impossible to detect visually.
However, if a black edge is observed in the outline of the fragments attached to the tablet, it is detected as a black foreign substance.
G2 is a black contaminant, which corresponds to dust or dirt on the tablet surface. Cracks on the tablet surface and contour patterns of tablet fragments as described above may also be observed as G2.
H1 is a white-based foreign substance, and a tablet fragment is one of the important defects corresponding thereto. H2 is a black-based foreign matter, and is also an important defect. Dirt and mixed dust generated in the packaging process correspond to this. I is an extra-fine linear foreign matter such as extra-fine hair or fiber, and is an important defect that has a high probability of being mixed in the packaging process. This foreign matter has a high risk of being overlooked in the reflection image due to low contrast in the conventional method. In a transmitted image, there is a high possibility that the image is not detected due to a diffraction phenomenon. N is a stain on the sheet portion. Although clear stains can be treated as foreign matter, stains of the same color system as the sheet color may not appear in the transmitted image like defect I. The notation N is expressed separately from dirt that can detect such a defect as a foreign substance.

FIGS. 5 and 6 are diagrams for explaining how bright each defect is observed in an input image in the present invention. FIG. 5 schematically shows an image when the tablet is observed from above. Note that a bright spot on the image is expressed as white, and a dark spot is expressed as black. Tablet T,
Only highlight F and white defect H1 are observed white. G
2 is observed black on a white background. As described above, I and N have a high risk of being overlooked due to a low contrast in a reflection image, and are likely not to be detected in a transmission image due to a diffraction phenomenon or a small transmittance difference. The above countermeasures will be described with reference to FIG. In the present invention, the half mirror M is provided directly below the packaging sheet 1. Part of the light L passing through the sheet portion is reflected by the half mirror M, and returns upward as a reflected light ray R. However, since light does not return at the place where the small defect I exists, the light is darker than the sheet portion, and therefore, the contrast of the defect is increased and the defect can be identified. In FIG. 5, for this reason, I and N are displayed in stronger black. According to the experiment, the reflectance of the half mirror was required to be 5% or more. Also, ground glass having surface reflection may be used as a half mirror in some cases. FIG.
Is a transmission image when illuminated from below the packaging sheet and observed with a camera above. Tablet T, defects H1 and H2 are observed in black. Highlights F, extra-fine hair and fibers I often do not appear in transmission images.

FIG. 1 is a diagram for explaining the principle of detecting a defect from the two image data shown in FIGS.
FIG. 1A shows a defect, and FIG.
When (a) is represented by three types of codes, the codes of each defect are shown, and there are a display method of a 2-bit code, an adjacent code, and a 4-bit code. In the two-bit code display method, the corresponding pixels in FIGS. 5 and 6 are represented by a 2-bit code with white portions being 1 and black portions being 0. The crack in J2 is represented by 01,
The missing portion of J1 is represented by 01. For example, tablet T
Is 1 in a reflection image and 0 in a transmission image, and is 10. Similarly, the defect H2 is 00 because both the reflection image and the transmission image are 0. Similarly, F is 11, J1 and J2 are 0.
1, G1 is 10, G2 is 00, H1 is 10, and I is 01. However, 01 of I and N is the same as 01 of the sheet portion S, but since it can be distinguished from the sheet portion as described above, it is particularly indicated as 0'1.

The presence of a defect is identified from the distribution map of the 2-bit code. However, it is not always possible to determine that J1 and J2 are defects without using the result of performing image processing of identifying the contour of the tablet contour based on the preliminary knowledge about the contour of the tablet. In the embodiment, it was possible to detect the change relatively easily by detecting the positional change in the edge direction. Next, the adjacent code method is an adjacent code distribution diagram in which codes of adjacent areas are described for each area having a relatively small area after area division by labeling processing. However, since J1 has both 10 and 01, it is set to 11. The 4-bit code scheme is a 4-bit code diagram obtained by adding an adjacent code to the code of each pixel. It is clear from this code diagram that it is possible to determine what all the defects fall into. Colors are assigned to each code and the position and type of the defect are displayed in color.
The center of gravity position, area, shape, and type feature amount are calculated and registered in the defect list. As described above, by creating a combination of light and shade information including both a reflection image and a transmission image, that is, a code, it is possible to easily detect the positions and defect classifications of all defects with high accuracy. Thus, in the present invention, a code representing the correlation between the light and dark distribution of both images is formed,
Detect defects from the code. As a result, the detection process is extremely clear and simple, and simple and highly accurate defect detection can be performed.

Further, as another method of this embodiment, instead of generating a code image, a logical operation is performed between each binary or multi-valued image of a reflection image and a transmission image, and the operation result obtained by the operation is obtained. Can be used to detect defects. The outline of the calculation method will be described below. For the reflection image of FIG. 5 and the transmission image of FIG. 6, the reflection image and the transmission image are binarized and subjected to AND processing.
Only the bright F region is extracted for both the reflection image and the transmission image. Also, after inverting the reflection image, AND
When the processing is performed, defects J1 and J2, which are dark areas in the reflection image and bright areas in the transmission image in the resulting image,
I, N and regions P and S are extracted brightly. Area T
Is darker in the result image, so that J1 and J2 can be distinguished. As described above, I and N can be identified by the contrast with S. Also, instead of inverting the reflection image, the transmission image is inverted and an AND process is performed. As a result, the defects G1 and H1, which are bright in the reflection image and dark in the transmission image, and the region T are extracted in the resulting image. Is done. Since G1 exists in the region T, its identification requires multi-value processing. The defect H1 is
Since the regions P and S are dark in this image, they are identifiable.
On the other hand, after inverting both the inverted image and the transparent image, AND
When processing is performed, only the defects G2 and H2 are extracted brightly,
It becomes identifiable. As described above, the defect can be detected by the four AND processes. Note that AN after inverting the image
Defects can also be identified by combining XOR processing, AND processing, and OR processing instead of D processing. For example, XOR and A
J1, J2, G1, and H1 can be identified by a combination of ND processing, and G2 and H2 can be identified by AND and NOT processing. However, since there is essentially no difference from the case of using a combination of inversion and AND, a detailed description is omitted.

FIG. 8 is a code distribution diagram in the case where the quantization of the reflection image and the transmission image is performed at four gradations and three gradations, respectively, instead of the binarization performed in FIG. When the light reflectance of the sheet portion is slightly higher, the reflected light amount of the pocket portion in the reflection image is smaller than that of the sheet portion. Similarly, the defects I and N have a smaller amount of reflected light than the sheet portion. Therefore, the reflection image is changed according to the brightness of the tablet, the pocket, the sheet, and the defect I.
Value. On the other hand, in the transmission image, ternarization is performed according to the light transmittance of the tablet, pocket, and sheet portion. And FIG.
A code in which a plurality of bits of reflection and transmission are created in the same procedure as in (1) is a code attached to a defect, and a code with adjacent codes is a code in parentheses () attached to each defect.
In this way, by making the reflection image and the transmission image multi-valued irrespective of binarization, the position of the defect can be identified in more detail using only the code.

FIG. 9 is a principle diagram of a sheet packaging inspection apparatus showing another embodiment of the present invention, and shows a method of simultaneously taking a reflection image and a transmission image into one image by using a color filter. ing. 1 shows a novel defect detection method of the present invention, in which a light source 3 with a green wavelength band-pass limited color filter 4 and a color camera 2 are placed above a packaging sheet 1 and a red wavelength below the packaging sheet. A light source 5 having a limited color filter 6 having a band pass function is placed, and both light sources 3 and 5 are in a continuous lighting state. A color separation circuit 7 is connected to the color camera 2, and performs green and red color separation from the camera output signal. In this figure, considering that the reflected image component of the camera signal corresponds to the green signal and the transmitted image component corresponds to the red signal, an image is formed from the green signal output from the color separation circuit 7. It can be generated and assigned to a reflection image, and similarly to an image from a red signal, and assigned to a transmission image. 2 separated
After one sheet of image is obtained, the position and classification of the defect are performed by the method of the first embodiment shown in FIG. As described above, since the reflection image and the transmission image can be simultaneously input using the limited color filter, the apparatus is simplified and the inspection time can be reduced by half. It should be noted that eliminating the overlap of the light transmission wavelength regions of the two filters 4 and 6 used at all may increase the cost of the filters and may actually reduce the light transmittance. For this reason, it is desirable to allow overlap.

FIG. 10 is a frequency transmittance characteristic diagram when the light transmission wavelength region of the filter according to the present invention is overlapped. In the transmission wavelength region of the limited color filters 4 and 6, there is a common region. The reflection image component is made to correspond to a signal in a region obtained by removing the common wavelength region from the wavelength region of the illumination for transmission. According to this method, an inexpensive color filter having a high transmittance can be used.

Next, a description will be given of an embodiment of an apparatus and a method for identifying a defect without classifying a reflection image and a transmission image by inputting an image while turning on the illumination on both sides of the packaging sheet. A dimmer is connected to the power supply of each of the two lighting devices placed above and below the packaging sheet. Thus, the ratio of the intensity of the reflection illumination to the intensity of the transmission illumination can be freely selected by adjusting the dimmer. As the light control device, an ND filter and a color filter can be used in addition to the Slidac.
Here, in consideration of the case where the sheet has a color and light absorption and scattering, the amount of light reflected and entering the camera is compared with the amount of light transmitted and entering the camera. The former is simply called the amount of reflected light, and the latter is simply called the amount of transmitted light. First, dimming is performed so that the amount of transmitted light is sufficiently larger than the amount of reflected light. At this time, the density distribution of the observed input image is roughly divided into the following four stages. In order of brightness, level 1 has F, level 2 has J1, J2, I, N,
P and S are classified into levels 3, G1, H1, and T, and the darkest level 4 is classified into G2 and H2.
Therefore, a process of calculating a quaternized image of the input image and classifying it into four levels is performed. Since only F is included in level 1, F can be detected. Since T is not included in level 2, J1 and J2 can be detected. However, for I and N, P and S are included in level 2 and the reflection component is relatively small, so that detection is not possible. Can not. At level 3, since areas S, P, and T are not included, G2 and H2 can be detected. Therefore, this method has a weak point in detecting dirt, thin hair and fibers of the same color on the sheet. Next, when the amount of reflected light and the amount of transmitted light are almost the same, defects detectable in the same manner as described above are F, G2, and H2. Although I and N are within the detectable range for the time being, there is a risk of missing detection. Similarly, when the amount of reflected light is sufficiently larger than the amount of transmitted light, F, G2, H1, and H2 can be detected, and I and N can also be detected.

FIG. 11 is a diagram showing the detection probabilities in the above cases in four stages of 〇, △, △ ′, and ×. The amount of reflected light and the amount of transmitted light are shown as large, medium, and small, and five patterns between them. F, G2, and H2 are relatively detectable without depending on the light amount ratio, but the others greatly depend on the light amount ratio. Therefore, it is necessary to input a plurality of images with different light intensity ratios.
In addition, as shown in FIG. 11, when the amount of transmitted light is slightly increased, J1, J2, and H1 can be detected. Although I and N can be expected to be detectable by dimming, the risk of missing detection is quite high. Therefore, it is clear that a defect can be stably detected by inputting a plurality of images in which the light amount ratio is combined. As described above, a defect can be detected by adjusting the ratio between the amount of reflected light and the amount of transmitted light without separating the reflected image and the transmitted image. Note that this method
This is equivalent to inputting the weighted addition image of the reflection image and the transmission image of the first embodiment, and adjusting the weighting factor by the dimmer at that time. A half mirror or a reflecting mirror corresponding to the ratio between the amount of reflected light and the amount of transmitted light can be used instead of the second light source. In this case, a half mirror or a reflecting mirror may be used while the second light source is kept on. In the latter case, there is an effect that the contrast of the reflection component increases in the detection of the defects I and N.

As described above, in the present invention, the wrapped portion, the sheet portion, and the pocket portion have different reflectivities and transmissivities, so that the brightness distribution observed by the television camera is of the reflective type and the transmissive type. The reflectivity and transmissivity differ greatly depending on the type, size, and position of the foreign matter even for the defective portion. Therefore, the reflection image and the transmission image have different brightness distribution characteristics. The present invention makes full use of this property. In the present invention, the reflection type and the transmission type are used simultaneously, in which the observation image in the reflected light and the observation image in the transmitted light are input without changing the positional relationship between the camera and the packaging sheet. In order to use the method of detecting the defect by obtaining the logical correlation in the above, the attached foreign matter, the mixed foreign matter, the deformation of the packaged part, the fragment, the dirt, and the smaller, It is possible to identify and detect very fine hair, fibers, and the like with high accuracy. In addition, in order to increase the efficiency of simultaneous use of the reflection type and the transmission type, as described above, simultaneous input of the reflection type and the transmission type under the limited color illumination conditions enables switching between the two types and the multiple images. It is possible to avoid the complexity of the device due to the input, and also to avoid the defect detection omission and false defect output due to the deviation of the local position correspondence between the reflected image and the transmitted image. Can be inspected.

Although two band-pass limited color filters are used in the embodiment, a low-pass or high-pass limited color filter may be used. Further, in the embodiment, a color limiting filter that passes green and red wavelengths is used, but other color combinations may be used. According to the color of the sheet or the color of the tablet itself, a limited color filter is selected so as to obtain the best contrast. Instead of a color filter, a light source having a different emission wavelength, such as a light emitting diode capable of emitting various wavelengths, may be used. In the embodiment, a television camera is used to obtain an image. However, a two-dimensional sensor such as a far-infrared camera, an X-ray camera, and a silver halide film can be used. On the other hand, in the embodiment, the position of the camera is set above the packaging sheet. However, it goes without saying that there is no problem even if the camera is arranged upside down or rotated in the rotating direction. Furthermore, although the present invention has been described with reference to the inspection of defects occurring in the tablet packaging process, the present invention is not limited to this, and can be applied to the inspection of various packaged parts.

[0019]

As described above, according to the present invention,
It illuminates the packaging sheet sequentially or simultaneously from above and below, and observes it with a television camera to obtain a reflection image and a transmission image. Since a code is formed and a defect is detected from the code, the detection process is extremely clear and simple, and the defect can be detected simply and with high accuracy. In addition, by proposing a method in which regions are divided and codes of adjacent regions are added, defects can be classified. In addition, by installing a reflection plate or a half mirror immediately below the packaging sheet, it becomes possible to detect the mixing of extra-fine hair or fibers. Further, by proposing a method of simultaneously inputting a reflection image and a transmission image illuminating the inspection target with two color-limited lights as one image, temporal control of the light source becomes unnecessary,
In addition, the number of input images can be halved, and defect detection can be performed easily, in a short time, and stably. Furthermore, a method for detecting a defect without separating a reflected image and a transmitted image is disclosed, so that it is possible to cope with a case where separation is difficult.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating the principle of detecting a defect from two image data according to an embodiment of the present invention.

FIG. 2 is a plan view showing the structure of a packaged tablet to be inspected according to the present invention.

FIG. 3 is a sectional view of a pocket portion to be inspected according to the present invention.

FIG. 4 is a diagram showing types of defects to be inspected according to the present invention.

FIG. 5 is a diagram for explaining how bright each defect is observed in an input image in the present invention, and is a schematic diagram when a tablet is observed from above.

FIG. 6 is a transmission diagram when the package sheet is illuminated from below and observed with an upper camera in the present invention.

FIG. 7 is an explanatory diagram of a method for detecting an extremely fine defect or stain-like stain.

FIG. 8 is a code diagram in a case where the quantization of the reflection image and the transmission image is performed at 4 gradations and 3 gradations, that is, the coding method of the present invention.

FIG. 9 is a structural view of a sheet packaging inspection apparatus according to a second embodiment of the present invention.

FIG. 10 is a characteristic diagram in the case where inspection is performed while allowing overlap of light transmission wavelength regions according to the present invention.

FIG. 11 shows the third embodiment of the present invention, and is a diagram showing detection probabilities when a dimmer is connected to a power supply unit.

[Explanation of symbols]

T: tablet, P: pocket, S: sheet, M: half mirror, 1: packaging sheet, L: incident light, R: reflected light, 2
... color camera, 3,5 ... light source, 4,6 ... color filter,
7 ... Color separation circuit.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2G051 AA02 AB01 AB02 BA01 BB07 BC01 CA03 CB01 CB02 EA11 EA16 EA17 EC01 EC06 ED07 ED23

Claims (8)

[Claims] 1. A sheet packaging inspection device for detecting a defect such as a mixed foreign substance, damage, or dirt present in a packaging sheet including a part to be packaged and a packaging sheet, wherein the inspection apparatus is arranged above the packaging sheet. A first light source for irradiating the packaging sheet; a two-dimensional sensor disposed above the packaging sheet to observe the packaging sheet; a unit for inputting a reflection image from above the packaging sheet; And a means for inputting a transmission image irradiated from below the packaging sheet, wherein the reflection image and the transmission image are respectively binarized or multi-valued. Calculate the values to calculate a plurality of binary or multi-valued images, generate a code distribution image indicating the density distribution of the plurality of images, and then convert the code distribution image into a sheet-wrapped component or a wrapping sheet. Existence Sheet wrapping inspecting device characterized by detecting the above defects. 2. A sheet packaging inspection apparatus for detecting defects such as contaminants, damage, dirt, etc., present in a packaging sheet comprising a part to be packaged and a packaging sheet, arranged above and below the packaging sheet. Illumination means comprising a light source having different color distribution emission characteristics from each other, or illumination means comprising a color filter having a different transmission wavelength distribution between each light source and the packaging sheet, disposed above the packaging sheet, A two-dimensional sensor for inputting a two-dimensional image of the packaging sheet while the light source is turned on, and a reflection image component input by the two-dimensional sensor corresponding to a color distribution of illumination light from above the packaging sheet; Color separation means for separating the reflected image and the transmitted image from the two-dimensional image by associating the transmitted image component with the color distribution of illumination light from below. Sheet packaging inspection equipment. 3. The sheet packaging inspection apparatus according to claim 2, wherein the color filters disposed above and below the packaging sheet include components common to transmission wavelength components, and are illuminated from above and below the input image. A sheet packaging inspection apparatus for removing a common wavelength component of light and thereafter separating a reflected image component and a transmitted image component. 4. A sheet packaging inspection device for detecting defects such as contaminants, damage, dirt, etc., present in a packaging sheet comprising a part to be packaged and a packaging sheet, the inspection device being disposed above the packaging sheet, A first light source that irradiates the packaging sheet; a second light source that is disposed below the packaging sheet and irradiates the packaging sheet; a two-dimensional sensor that observes the packaging sheet; and inputs an image of the packaging sheet. Means for simultaneously turning on the light sources 1 and 2 and performing binarization or multi-value processing on the density distribution of the input image and then presenting the sheet-packed parts or the packaging sheet. A sheet packaging inspection device for detecting a defect. 5. The sheet packaging inspection device according to claim 4, wherein at least one of the first light source and the second light source is a light control device capable of changing illumination intensity, or a transmission amount or transmission. A sheet packaging inspection device comprising an optical filter capable of changing a wavelength band, wherein a ratio between a reflected light amount and a transmitted light amount is adjusted according to a color distribution, a reflectance, and a transmittance of the packaging sheet. 6. The sheet packaging inspection device according to claim 1, wherein a reflection is provided in addition to each of the means according to claim 1 or instead of the second light source according to claim 4. A sheet packaging inspection device, wherein a half mirror or a reflection plate having at least 5% or more of components is disposed directly below the packaging sheet. 7. The sheet packaging inspection device according to claim 1, wherein instead of generating the code distribution image, a logical operation is performed between each binary or multi-valued image of the reflection image and the transmission image.
A sheet packaging inspection device for detecting a defect from a calculation result obtained by the calculation. 8. A light source and a two-dimensional sensor are arranged above the packaging sheet, a reflected image from above the packaging sheet is input by the two-dimensional sensor, and a light source is arranged below the packaging sheet. A transmission image illuminated from below the packaging sheet is input by the two-dimensional sensor, and the reflection image and the transmission image are binarized or multi-valued to calculate a plurality of binary or multi-value images. A code distribution image representing the density distribution of the plurality of images is generated, and the density distribution or the code distribution of the input image is divided into regions. A sheet packaging inspection method, wherein a defect is detected by giving a code value of an area as an auxiliary code.