JP7065755B2 - Goods inspection equipment - Google Patents

Description

The present invention relates to an article inspection device capable of acquiring a plurality of different wavelength Narrow Band Imaging (NBI) images.

Spectroscopy (ultraviolet spectroscopy, visible spectroscopy, near-infrared spectroscopy, infrared spectroscopy) that allows light (ultraviolet, visible, near-infrared, infrared, etc.) to pass through a sample and measures the absorption spectrum of the sample at each wave number. and so on. Since the absorption wavelength and intensity of this absorption spectrum are determined by the chemical structure of the target substance, it can be used for specifying and quantifying the components of the substance. This method is used for evaluation of the content and maturity of tomato lycopene, evaluation of freshness, sugar content, acidity and discoloration of fruits and vegetables, evaluation of cosmetics, and component analysis of pharmaceutical products.

In recent years, various techniques have been studied for the purpose of acquiring spectral images. For example, Patent Document 1 below discloses a technique in which light from a subject is separated into a plurality of wavelength regions by a spectroscope and the light in each wavelength region is received by an image sensor.

Further, the hyperspectral camera of Patent Document 1 disperses the light from the subject into a plurality of wavelength regions by a spectroscope, and causes the image pickup element to receive the light for each wavelength region to obtain a two-dimensional image of the subject. It acquires hyperspectral data in which spectral information is associated with each constituent pixel, and has a scanning mechanism that reflects light from the subject and scans the reflected light along a predetermined direction. A correction lens provided between the scan mechanism and the spectroscope that adjusts the focal position of the light scanned by the scan mechanism, and a correction lens that is placed at the focal position of the correction lens to inject light into the spectroscope and of the scan mechanism. It has a slit formed in the longitudinal direction along a direction substantially perpendicular to the scanning direction.

Further, Patent Document 2 below includes a real image having a first region for selecting a specific wavelength for incident light and a second region for not changing the optical characteristics, and an optical image in which the optical characteristics are not changed by one camera. A technique for simultaneously acquiring both optical spectrum images with changed characteristics is disclosed.

Further, in Patent Document 2, the light from the objective lens is received by the image sensor via the optical characteristic changing portion, and the optical characteristic changing portion has a plurality of divided portions and selectively selects one of the divided portions. Place it in the optical path. The dividing unit has a first region for selecting a specific wavelength and a second region for not changing the optical characteristics, and the optical characteristics changing unit changes the optical characteristics to a real image in which the optical characteristics are not changed by one camera. Both of the optical spectrum images that have been made can be acquired at the same time.

Further, in Patent Document 3 below, for a plurality of wavelength bands selected in advance, the wavelength selection filter is switched by changing the optical path. The technology to be used is disclosed.

Further, Patent Document 3 captures a two-dimensional image of a plurality of wavelength bands selected in advance according to the physical properties of the detection target, and detects a substance in each pixel of the two-dimensional image. In the step of capturing a two-dimensional image, the wavelength selection filter of the irradiation destination of the reflected light is switched by reflecting the received light and changing the optical path of the reflected light, and the light of a plurality of wavelength bands is transferred to the wavelength selection filter. Each of them is transmitted and irradiated to a plurality of image pickup elements.

Further, Patent Document 4 below includes a technique of acquiring a plurality of optical spectrum images to be measured by sequentially switching a set wavelength, which is composed of an image camera (frame image) and a spectrum camera (optical spectrum image). Is disclosed.

Further, in Patent Document 4, the optical spectrum image is acquired by the second camera, the frame image is acquired by the first camera in synchronization with the acquisition, and a plurality of feature points are extracted from one frame image to obtain the feature points. Multiple optical spectra are sequentially specified in the frame images that are continuous in time series, image matching is performed between the frame images based on the feature points for the multiple optical spectrum images and the corresponding frame images, and multiple optical spectra are performed based on the conditions obtained by the image matching. Images are combined to generate a hyperspectral image.

Japanese Patent No. 5632060 Japanese Patent No. 58025216 Japanese Patent No. 5845858 Japanese Patent No. 6188750

However, all of the above-mentioned conventional devices have a problem that they are large-scale, expensive, and take a long time to measure.

Therefore, the present invention has been made in view of the above problems, and is an article inspection device capable of detecting and inspecting the characteristics of an object to be inspected without requiring time for measurement with an inexpensive and simple configuration. Is intended to provide.

In order to achieve the above object, the article inspection apparatus according to the present invention has a transport means 3 for transporting the inspected object W along a predetermined transport path, and sequentially transports the inspected object to be conveyed by the transport means. In the article inspection device to be inspected
A light source unit 2 having light sources 2a, 2b, 2c having a plurality of arbitrary narrow wavelength components for outputting light having different wavelengths and irradiating the object W to be inspected.
A plurality of color filters 4a having different transmission wavelength bands that are arranged in a predetermined pattern and transmit the wavelengths of the plurality of light sources corresponding to each of the plurality of light sources, and the plurality of light sources that have passed through the plurality of color filters. A light source unit 4 having a two-dimensional image sensor 4b that outputs light intensity data corresponding to light in each wavelength band, and
A data acquisition unit 5 that acquires and stores the light intensity data output by the light receiving unit, and
An image data generation unit 6 that generates two-dimensional image data for each wavelength band of the plurality of light sources from the light intensity data stored in the data acquisition unit.
The characteristic data storage unit 7a for storing the light intensity data corresponding to the plurality of light sources and the characteristic data representing the characteristics of the article, and the characteristic data storage unit 7a.
Characteristics of the inspected object based on the characteristic data stored in the characteristic data storage unit and the intensity data of each pixel of the two-dimensional image data for each wavelength band of the plurality of light sources generated by the image data generation unit. The characteristic detection unit 8 that detects
It is characterized by being equipped with.

Further, the article inspection apparatus according to the present invention corresponds to the wavelength of the light source turned on with only one light source turned on for each of the plurality of light sources 2a, 2b, 2c. It is provided with a correction data storage unit 7b that stores in advance the ratio of the light intensity data that has passed through the color filter to be corrected and the light intensity data that has passed through other color filters as correction data.
The light intensity data read by the data acquisition unit 5 may be corrected by the correction data to generate two-dimensional image data for each wavelength band of the plurality of light sources.

According to the present invention, it is possible to detect the characteristics of an inspected object by acquiring an imaging image of light having a plurality of different wavelengths (wavelengths in a narrow band) at high speed with an inexpensive and simple configuration.

It is a figure which shows the schematic structure of the article inspection apparatus which concerns on this invention. (A) is a schematic configuration diagram when light of a plurality of wavelengths is simultaneously irradiated to an object to be inspected, and (b) is a diagram showing the emission timing of light of a plurality of wavelengths. (A) It is a figure which shows the absorption spectrum characteristic for each content of lycopene of tomato, and (b) is a figure which shows the wavelength sensitivity characteristic of a two-dimensional image sensor after passing through a color filter. It is a figure which shows the absorption spectrum characteristic for each sugar content of tomato. It is a figure which shows the reflection spectrum characteristic for each elapsed time of beef. It is a figure which shows the reflection spectrum characteristic for each elapsed time of tuna. It is a figure which shows the reflection spectrum characteristic by the elapsed time of a leaf vegetable. (A) is a schematic configuration diagram in the case of irradiating an object to be inspected with light of a plurality of wavelengths in a time-division manner, and (b) is a diagram showing the emission timing of light of a plurality of wavelengths.

Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the attached drawings.

As shown in FIG. 1, the article inspection device 1 of the present embodiment includes a light source unit 2, a transport unit 3, a light receiving unit 4, a data acquisition unit 5, an image data generation unit 6, a storage unit 7, and a characteristic detection unit 8. It is roughly configured in preparation for.

The light source unit 2 includes a plurality of light sources 2a, 2b, 2c that emit light of different wavelengths, and an irradiation unit 2b that irradiates the object W with light from the plurality of light sources 2a, 2b, 2c.

As shown in FIG. 3B, for example, the plurality of light sources in this example are a light source 2a that emits blue (450 nm) light of arrow A, a light source 2b that emits green (550 nm) light of arrow B, and an arrow. It is composed of a light source 2c that emits red (680 nm) light of C.

The light source unit 2 is a super luminescent diode, which is light obtained by passing blue, green, and red output light from a laser diode (LD) and blue, green, and red output light from a light emitting diode (LED) through an optical band path filter. The blue, green, and red output light produced by (SLD) is output as one of the light passed through the optical band path filter.

As each light source (first light source 2a, second light source 2b, third light source 2c), for example, the output light of a laser diode or the output light of a light emitting diode (LED: Light Emitting Diode) is passed through an optical bandpath filter. Light, light obtained by passing the output light of a super luminescent diode (SLD) through an optical band path filter, or the like can be selectively used.

The irradiation unit 2d irradiates the object W with light of a plurality of different wavelengths (blue, green, red) from the plurality of light sources 2a, 2b, and 2c.

The transport unit 3 sequentially transports the object W to be inspected on the transport path at predetermined intervals, and is composed of, for example, a belt conveyor arranged horizontally with respect to the main body of the apparatus.

The belt conveyor 3 as a transport unit is formed of a light transmitting belt that transmits light from a plurality of light sources 2a, 2b, 2c to which the transport belt is irradiated by the irradiation unit 2d, and inspects the object W to be inspected. At that time, the drive is controlled by a preset transfer speed. As a result, the object W to be inspected is conveyed on the belt conveyor 4 in the conveying direction X in FIG. 1 at predetermined intervals.

As shown in FIG. 2A, the light receiving unit 4 includes a color filter 4a and a two-dimensional image sensor 4b. The light receiving unit 4 corresponds to each of the plurality of light sources 2a, 2b, and 2c having the wavelengths of blue, green, and red of the light source unit 2, and a plurality of color filters 4a that transmit the wavelengths of blue, green, and red, respectively, have a predetermined pattern. Is arranged on the light receiving surface of the two-dimensional image sensor 4b. Specifically, three types of color filters 4a of R, G, and B are arranged on the light receiving surface of the two-dimensional image sensor 4b in a predetermined pattern having a ratio of, for example, R: G: B = 1: 2: 1. .. When the light receiving unit 4 irradiates the object W with blue, green, and red wavelengths of light from the light source unit 2 with the irradiation unit 2d, the light receiving unit 4 receives the transmitted light from the object W to be inspected and receives the light. Outputs light intensity data proportional to the intensity.

Although the light receiving unit 4 receives the transmitted light from the inspected object W, the light receiving unit 4 may receive the reflected light from the inspected object W. In this case, it is preferable that the belt conveyor 3 as the transport unit is made of a material that reflects light from a plurality of light sources 2a, 2b, 2c of the light source unit 2.

The data acquisition unit 5 reads and acquires the light intensity data output from the light receiving unit 4, and stores the acquired light intensity data.

The image data generation unit 6 generates two-dimensional image data for each of the blue, green, and red wavelength bands of the plurality of light sources 2a, 2b, and 2c from the light intensity data read by the data acquisition unit 5.

The storage unit 7 includes a characteristic data storage unit 7a and a correction data storage unit 7b. The characteristic data storage unit 7a has spectral characteristics (for example, FIG. 3A) according to the characteristics (for example, content, sugar content, freshness, etc.) of each known article when irradiated with light from a plurality of light sources 2, 2b, 2c. And the absorption spectrum characteristics of FIG. 4, the reflection spectrum characteristics of FIGS. 5, 6, 7, etc.) are stored as characteristic data.

The characteristic data includes data on the absorbance (absorption amount) and reflectance (reflection amount) near the wavelength where the characteristic change of the article (for example, content, sugar content, freshness, etc.) is small and the characteristic change is characteristic. At least it should be included.

The correction data storage unit 7b lights only one light source (any of 2a, 2b, 2c) for each of the plurality of light sources 2a, 2b, 2c for each of the plurality of light sources 2a, 2b, 2c having different wavelengths. In this state, the ratio of the light intensity data that has passed through the color filter corresponding to the wavelength of the lit light source and the light intensity data that has passed through the other color filters is stored in advance as correction data.

The characteristic detection unit 8 reads the characteristic data of the article corresponding to the object W to be inspected from the characteristic data storage unit 7a, and the characteristic data of the read article and a plurality of two-dimensional image data generated by the image data generation unit 6 The characteristics of the inspected object W are detected based on the intensity data of each pixel.

Here, the light receiving unit 4 in the present embodiment corresponds to each of the plurality of light sources 2a, 2b, 2c of the light source unit 2, and a plurality of different transmission wavelength bands that transmit the wavelengths of the plurality of light sources 2a, 2b, 2c. It has a color filter 4a, that is, a two-dimensional image sensor 4b in which a blue, green, and red color filters 4a corresponding to a plurality of light sources 2a, 2b, and 2c in the blue, green, and red wavelength bands are arranged.

However, an error occurs when green or red light leaks into the blue color filter of the two-dimensional image sensor 4b or when blue or red light leaks into the green color filter of the two-dimensional image sensor 4b. ..

Therefore, in the present embodiment, only one of the plurality of light sources 2a, 2b, and 2c of the light source unit 2 is turned on, and the light intensity that has passed through the color filter of the two-dimensional image sensor 4b corresponding to the wavelength of the turned on light source. The ratio of the data to the light intensity data that has passed through another color filter is stored in the correction data storage unit 7b in advance as correction data, and the light intensity data read by the data acquisition unit 5 is stored in the correction data storage unit 7b. The error is eliminated by correcting with the correction data. Hereinafter, a specific description will be given.

(1) In advance, the leakage ratio from the light of other colors leaking into each of the red (R), green (G), and blue (B) detection elements is obtained and used as correction data.

a) When only the blue light source is turned on-The detection intensity of the green (G) detection element and the detection intensity of the blue (B) detection element are measured, and the ratio is corrected data (Cal (Gb) = green (G)). Detection intensity / blue (B) detection intensity).
-Measure the detection intensity of the red (R) detection element and the detection intensity of the blue (B) detection element, and measure the ratio to the correction data (Cal (Rb) = red (R) detection intensity / blue (B) detection intensity). And.

b) When only the green light source is turned on-The detection intensity of the blue (B) detection element and the detection intensity of the green (G) detection element are measured, and the ratio is corrected data (Cal (Bg) = blue (B)). Detection intensity / green (G) detection intensity).
-Measure the detection intensity of the red (R) detection element and the detection intensity of the green (G) detection element, and measure the ratio to the correction data (Cal (Rg) = red (R) detection intensity / green (G) detection intensity). And.

c) When only the red light source is turned on-The detection intensity of the blue (B) detection element and the detection intensity of the red (R) detection element are measured, and the ratio is corrected data (Cal (Br) = blue (B)). Detection intensity / red (R) detection intensity).
-Measure the detection intensity of the green (G) detection element and the detection intensity of the red (R) detection element, and measure the ratio to the correction data (Cal (Gr) = green (G) detection intensity / red (R) detection intensity). And.

Next, a method for correcting light intensity data in an actual measurement (a state in which the red light source, the green light source, and the blue light source are turned on at the same time) will be described.

The light intensity data detected by each of the blue (R), green (G), and blue (B) detection elements is M (R), M (G), and M (B), and the true light intensity of the red light source is set. Assuming that the true light intensity of T (R) and the green light source is T (G) and the true light intensity of the blue light source is T (B), it is expressed by the following equations (1), (2) and (3). ..

M (R) = {T (R) -T (R) x Cal (Br) -T (R) x Cal (Gr)} + T (B) x Cal (Rb) + T (G) x Cal (Rg) ... Equation (1)

M (G) = {T (G) -T (G) x Cal (Bg) -T (G) x Cal (Rg)} + T (B) x Cal (Gb) + T (R) x Cal (Gr) ... Equation (2)

M (B) = {T (B) -T (B) x Cal (Rb) -T (B) x Cal (Gb)} + T (G) x Cal (Bg) + T (R) x Cal (Br) ... Equation (3)

Therefore, the light intensity data detected by each of the red (R), green (G), and blue (B) detection elements leaks to each of the red (R), green (G), and blue (B) detection elements in advance. Leakage ratio from light of other colors to enter Cal (Gb), Cal (Rb), Cal (Bg), Cal (Rg), Cal (Br), Cal (Gr) by obtaining the equation (1). )-(3), the true light intensities T (R), T (G), and T (B) of the light source can be obtained.

Next, a method for detecting the characteristics of the object to be inspected W, which is configured as described above and uses the article inspection device 1, will be described.

First, for each of the first light source 2a, the second light source 2b, and the third light source 2c, with only one light source lit, the light intensity passed through the color filter corresponding to the wavelength of the lit light source. The ratio between the data and the light intensity data that has passed through the other color filters is stored in advance in the correction data storage unit 7b as correction data.

Then, the object W to be inspected is transported in the transport direction X by the transport unit 3, and the first light source 2a, the second light source 2b, and the third light source 2c having different peak wavelengths with respect to the subject W to be inspected. Light is irradiated through the irradiation unit 2d.

When the light from the light sources 2a, 2b, 2c is applied to the inspected object W via the irradiation unit 2d, the transmitted light or the reflected light from the inspected object W passes through the color filter 4a and is a two-dimensional image sensor 4b. Is entered in.

The two-dimensional image sensor 4b corresponds to each of the light sources 2a, 2b, and 2c, and a plurality of color filters 4a having different transmission wavelength bands that transmit the wavelengths of the light sources 2a, 2b, and 2c are arranged in a predetermined pattern. , Outputs light intensity data according to the transmitted light or reflected light from the object W to be inspected. The light intensity data output from the two-dimensional image sensor 4b is read and stored by the data acquisition unit 5.

Then, the image data generation unit 6 corrects the light intensity data read by the data acquisition unit 5 with the correction data stored in the correction data storage unit 7b, and the first light source 2a, the second light source 2b, and the third light source 2c Generates two-dimensional image data for each wavelength band.

Then, the characteristic detection unit 8 has the characteristic data of the article corresponding to the object W to be inspected read from the characteristic data storage unit 7a, and the intensity data of each pixel of the plurality of two-dimensional image data generated by the image data generation unit 6. The characteristics of the inspected object W are detected based on the above.

[Concrete example]
Next, specific examples of evaluation of the characteristics (content, sugar content, freshness) detected by the above-mentioned article inspection device 1 will be described with reference to FIGS. 3 to 7.

First, as an example of the content evaluation of tomato lycopene, FIG. 3 (a) shows the absorption spectrum characteristics for each tomato lycopene content, and FIG. 3 (b) shows the wavelength sensitivity characteristics of the two-dimensional image sensor 4b after passing through the color filter. show. In FIG. 3A, the absorption spectrum having a lycopene content of 9.1 mg / 100 g is shown by a thick line, the absorption spectrum having a lycopene content of 7.5 mg / 100 g is shown by a dotted line, and the absorption spectrum having a lycopene content of 0 mg / 100 g is shown by a thin line.

As shown in FIG. 3A, the relationship of the absorption spectrum with respect to the content of lycopene in tomato is characterized by absorption characteristics near 550 nm and around 680 nm. That is, the larger the content of lycopene, the larger the absorption near 550 nm and the smaller the absorption around 680 nm.

Therefore, the amount of absorption with respect to the content of lycopene in the vicinity of 550 nm and 680 nm and the wavelength of 500 nm or less where the change in the amount of absorption due to the content of lycopene in tomato is small is measured in advance, and the measured data is stored in the characteristic data storage unit 7a as characteristic data. I'll do it. Then, the absorption amount with respect to the content of lycopene in the vicinity of 550 nm (arrow B in FIG. 3B) and around 680 nm (arrow C in FIG. 3B) when the absorption amount of the wavelength of 500 nm or less is used as a reference, and in advance. The content of lycopene in tomato can be detected and evaluated based on the stored characteristic data.

Next, as an example of the sugar content evaluation of tomato, FIG. 4 shows the absorption spectrum characteristics for each sugar content of tomato. In FIG. 4, the absorption spectrum having a sugar content of 9.4 is shown by a thick line, the absorption spectrum having a sugar content of 6.6 is shown by a dotted line, and the absorption spectrum having a sugar content of 3.9 is shown by a thin line.

Similar to the above-mentioned content of lycopene in tomato, the sugar content can be determined from the relationship between the absorption amounts near 550 nm and around 680 nm, which have a characteristic absorption spectrum. Therefore, the absorption amount for the sugar content of tomatoes at a wavelength of 500 nm or less and around 550 nm and 680 nm, in which the change in the absorption amount due to the sugar content of the tomato is small, is measured in advance, and the measured data is stored in the characteristic data storage unit 7a as characteristic data. back. Then, the sugar content of tomato can be detected and evaluated based on the absorption amount for the sugar content in the vicinity of 550 nm and 680 nm based on the absorption amount in the wavelength of 500 nm or less and the characteristic data stored in advance.

Next, as an example of evaluation of freshness of beef and tuna, FIG. 5 shows the reflection spectrum characteristics of beef for each elapsed time, and FIG. 6 shows the reflection spectrum characteristics of tuna for each elapsed time. In FIG. 5, the reflection spectrum after 0 hours is shown by a thick line, the reflection spectrum after 1 hour is shown by a dotted line, and the reflection spectrum after 5 hours is shown by a thin line. Further, in FIG. 6, the reflection spectrum after 0 minutes is shown by a dotted line, and the reflection spectrum after 60 minutes is shown by a solid line.

As shown in FIGS. 5 and 6, the freshness can be determined from the region where the reflection spectrum intensity changes depending on the freshness (600-630 nm) and the region where the reflection spectrum intensity does not change depending on the freshness (550-560 nm). Therefore, the reflection amount for the freshness of beef and tuna around 550 nm and 630 nm and the wavelength of 500 nm or less where the change in the reflection amount due to the freshness of beef and tuna is small is measured in advance, and the measured data is used as characteristic data in the characteristic data storage unit 7a. Remember in. Then, the freshness of beef and tuna can be detected and evaluated based on the reflection amount for freshness near 550 nm and 630 nm when the reflection amount of 500 nm or less is used as a reference, and the characteristic data stored in advance.

Next, FIG. 7 shows the reflection spectral characteristics of the leafy vegetables for each elapsed time as an example of the freshness evaluation of the leafy vegetables. In FIG. 7, the reflection spectrum after 0 minutes is shown by a dotted line, and the reflection spectrum after 30 minutes is shown by a solid line.

The outermost part of the epidermal structure of the plant is the glossy cuticle layer. The Kuchikura layer is a transparent, water-impermeable layer made of cutin (a polymerized substance of unsaturated fatty acids) and wax (an ester compound of higher fatty acids and higher alcohols) on the outside of the cell wall. The surface of plant leaves, stems, fruits and seeds repels water because of this layer, which helps prevent water ingress and evaporation of water. As time goes by, the cuticle layer deteriorates and the reflectance characteristics also change.

For example, in the case of leafy vegetables, as shown in FIG. 7, the light absorption by chlorophyll decreases with the passage of time, the reflectance near 680 nm increases, and the near-infrared reflectance at 700 to 800 nm increases. It shows a tendency to gradually decrease. With this change, the NDVI (Normalized Difference Vegetation Index) decreases over time. Then, as the reflectance near 680 nm increases, the ratio of red to green of the leaves increases, so that the apparent color gradually changes to yellow.

Therefore, the reflection amount for the freshness of the leafy vegetables is measured in advance at a wavelength of 500 nm or less and the freshness of the leafy vegetables around 450 nm and 680 nm, and the measured data is used as characteristic data in the characteristic data storage unit 7a. Remember in. Then, the freshness of the leafy vegetables can be detected and evaluated based on the reflection amount for the freshness around 450 nm and 680 nm when the reflection amount of 500 nm or less is used as a reference and the characteristic data stored in advance.

As described above, according to the present embodiment, it is possible to acquire an imaging image by light of a plurality of different wavelengths (wavelengths in a narrow band) at high speed with an inexpensive and simple configuration. In addition, the intensity of the characteristic wavelength to be measured can be accurately measured from the acquired imaging image.

By the way, in the above-described embodiment, a case where a plurality of different wavelengths (λ1, λ2, λ3) are simultaneously output from the first light source 2a, the second light source 2b, and the third light source 2c and measured is described as an example. As shown in FIGS. 8A and 8B, the light sources 2a, 2b, and 2c having different wavelengths (λ1, λ2, λ3) are controlled to be turned on / off, and a plurality of different wavelengths (λ1, λ2, λ3) are covered. It is also possible to adopt a time-divided measurement method in which the inspection object W is sequentially irradiated as intermittent light and the transmitted light (or reflected light) from the inspection object W is detected.

Although the best form of the article inspection apparatus according to the present invention has been described above, the present invention is not limited by the description and drawings in this form. That is, it goes without saying that all other forms, examples, operational techniques, and the like made by those skilled in the art based on this form are included in the scope of the present invention.

1 Article inspection device 2 Light source 2a, 2b, 2c Light source 2d Irradiation 3 Transport 4 Light receiving 4a Color filter 4b 2D image sensor 5 Data acquisition 6 Image data generation 7 Storage 7a Characteristic data storage 7b Correction data Storage unit 8 Characteristic detection unit W Inspected object X Transport direction

Claims (2)

In an article inspection device having a transport means (3) for transporting an object to be inspected (W) along a predetermined transport path and sequentially inspecting the object to be inspected to be conveyed by the transport means.
A light source unit (2) having a light source (2a, 2b, 2c) having a plurality of arbitrary narrow wavelength components for outputting light of different wavelengths and irradiating the object (W) to be inspected.
A plurality of color filters (4a) having different transmission wavelength bands that are arranged in a predetermined pattern and transmit the wavelengths of the plurality of light sources corresponding to each of the plurality of light sources, and the plurality of color filters that have passed through the plurality of color filters. A light receiving unit (4) having a two-dimensional image sensor (4b) that outputs light intensity data corresponding to light in each wavelength band of a light source, and
A data acquisition unit (5) that acquires and stores the light intensity data output by the light receiving unit, and
An image data generation unit (6) that generates two-dimensional image data for each wavelength band of the plurality of light sources from the light intensity data stored in the data acquisition unit, and
A characteristic data storage unit (7a) that stores the light intensity data corresponding to the plurality of light sources and characteristic data representing the characteristics of the article, and
Characteristics of the inspected object based on the characteristic data stored in the characteristic data storage unit and the intensity data of each pixel of the two-dimensional image data for each wavelength band of the plurality of light sources generated by the image data generation unit. The characteristic detection unit (8) that detects
An article inspection device characterized by being equipped with. Light intensity data that has passed through a color filter corresponding to the wavelength of the lit light source with only one light source lit for each of the plurality of light sources (2a, 2b, 2c). It is equipped with a correction data storage unit (7b) that stores in advance the ratio of light intensity data that has passed through other color filters to the light intensity data as correction data.
The article inspection according to claim 1, wherein the light intensity data read by the data acquisition unit (5) is corrected by the correction data, and two-dimensional image data for each wavelength band of the plurality of light sources is generated. Device.

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