WO2011122584A1

WO2011122584A1 - Food quality inspection device and method of inspecting food quality

Info

Publication number: WO2011122584A1
Application number: PCT/JP2011/057707
Authority: WO
Inventors: 田村　守
Original assignee: 株式会社システムブレイン
Priority date: 2010-03-29
Filing date: 2011-03-28
Publication date: 2011-10-06
Also published as: JPWO2011122584A1

Abstract

Provided are a food quality inspection device and a method of inspecting food quality which are capable of inspecting food quality with high accuracy. A first near-infrared light with a first wavelength which is selected from absorption spectra specific to a substance to be measured and a second near-infrared light with a second wavelength which is absorbed less than the first near-infrared light by the substance to be measured are irradiated onto a food. The change in the first near-infrared light caused by the substance to be measured is detected on the basis of the difference between the first near-infrared light and the second near-infrared light in reflected light from the food, and the quality of the food is inspected.

Description

Food quality inspection apparatus and food quality inspection method

The present invention relates to a food quality inspection apparatus and a food quality inspection method, and more particularly to a food quality inspection apparatus and a food quality inspection method that are suitably used to determine the freshness of food.

∙ Freshness of fresh food is generally confirmed visually. For example, fresh fish meat is a beautiful red color but turns brown when it deteriorates. This is because the protein called myoglobin, which is a muscle red pigment contained in fish meat, is a fresh red color that is bound to oxygen (oxygenated myoglobin) when it is fresh, but it is oxidized and oxidized myoglobin when exposed to air for a long time. Because it becomes brown. By visually observing this color change, the freshness of the fish meat can be confirmed, but naturally only the surface change of the fish meat is known.

Therefore, a meat freshness measuring apparatus that irradiates light of different wavelengths and detects a change in meat pigment and measures freshness based on spectrum data for each wavelength obtained from meat has been proposed (for example, , See Patent Document 1).

Japanese Patent Laid-Open No. 03-96838

The apparatus for measuring freshness of meat described in Patent Document 1 was able to perform a spectrum analysis of changes in meat pigments in meat, but the actual measurement target substances (meat pigments Mb, MbO, MMb here) Absorption could not be determined. In the case of fish meat, unlike the solution, most of the light is reflected on the surface, and the light that has entered the interior also receives multiple scattering. The attenuation of light due to reflection on the surface and multiple scattering is several tens of times greater than the attenuation due to absorption of the measurement target substance (in this case, myoglobin). Therefore, the actual absorption of the measurement target substance could not be measured at all.

Such a problem exists not only in fish meat but also in other foods such as foods containing myoglobin such as ham and sausage. Similarly, when measuring other substances to be measured other than myoglobin, attenuation of light due to multiple scattering has been a problem.

In view of such circumstances, an object of the present invention is to provide a food quality inspection apparatus and a food quality inspection method capable of inspecting food quality with high accuracy.

The aspect of the present invention that solves the above problems includes a first light source that irradiates food with a first near-infrared light having a first wavelength selected from an absorption wavelength region unique to a measurement target substance, and a first near-red light. A second light source that irradiates the food with a second near-infrared light having a second wavelength that is less absorbed by the substance to be measured than external light; and the first near-red light among the reflected light reflected from the food A first spectroscopic unit that selectively transmits external light; a second spectroscopic unit that selectively transmits the second near-infrared light of the reflected light; and a reflected light that has passed through the first spectroscopic unit. A first image pickup device that picks up an image, a second image pickup device that picks up the reflected light that has passed through the second spectroscopic means, and an image processing unit, wherein the first light source and the second light source operate simultaneously, The image processing unit is configured to obtain a signal obtained from the first image sensor and a second image sensor. The food quality inspection apparatus is characterized in that a first near-infrared absorption image is formed on the basis of the difference between signals.

In this aspect, when detecting the absorption of the first near-infrared light by the substance to be measured for food, the influence of reflection on the food surface or multiple scattering inside the food can be eliminated. Thereby, the absorption of the first near infrared light can be detected with high accuracy, and the quality of the food can be inspected with high accuracy. Further, the absorption of the first near-infrared light can be confirmed from the image, that is, the quality of the food can be easily confirmed from the image, and the quality of the food can be inspected quickly and easily. Furthermore, a wide range of quality of food can be easily confirmed.

In another aspect of the present invention, the first near-infrared light having a first wavelength selected from an absorption wavelength region unique to the measurement target substance and the absorption by the measurement target substance more than the first near-infrared light. A light source that irradiates the food with a second near-infrared light having a small second wavelength, and a first spectroscopic means that selectively transmits the first near-infrared light among the reflected light reflected from the food; , Second spectroscopic means for selectively transmitting the second near-infrared light in the reflected light, first image pickup device for imaging the reflected light transmitted through the first spectroscopic means, and the second spectroscopic means A second image pickup device that picks up the reflected light that has passed through and an image processing unit, wherein the image processing unit is a difference between a signal obtained from the first image pickup device and a signal obtained from the second image pickup device. A food product characterized by forming a first near-infrared absorption image based on In the inspection apparatus.

As a preferred embodiment of the present invention, the substance to be measured is oxidized myoglobin or oxidized hemoglobin, and the second wavelength is a wavelength for removing multiple scattering.

Furthermore, it is preferable that an image display unit for displaying the absorption image of the first near infrared light is further provided. According to this, the formed absorption image of the first near infrared light can be confirmed immediately, and the quality of the food can be inspected more easily.

In another aspect of the present invention, the first near-infrared light having a first wavelength selected from an absorption wavelength region unique to the measurement target substance, and the absorption by the measurement target substance more than the first near-infrared light. The food is irradiated with second near infrared light having a small second wavelength, and the difference between the first near infrared light and the second near infrared light in the reflected light reflected from the food The food quality inspection method is characterized by detecting a change in the first near-infrared light due to the substance to be measured and inspecting the quality of the food.

In this aspect, when detecting the absorption of the first near-infrared light by the substance to be measured for food, the influence of reflection on the food surface or multiple scattering inside the food can be eliminated. Thereby, the absorption of the first near infrared light can be detected with high accuracy, and the quality of the food can be inspected with high accuracy.

As a preferred embodiment of the present invention, the first image is obtained by irradiating the food with the first near-infrared light and photographing the reflected light of the first near-infrared light from the food. And obtaining the second image by irradiating the food with the second near-infrared light and photographing the reflected light of the second near-infrared light from the food. And what inspects the quality of the said food by forming the absorption image of the 1st near-infrared light based on the difference of the said 1st image and the said 2nd image is mentioned.

It is a block diagram which shows the quality inspection apparatus of the foodstuff which concerns on Embodiment 1. FIG. It is explanatory drawing of the quality inspection apparatus of the foodstuff which concerns on Embodiment 1. FIG. It is a figure which shows the result at the time of the measurement start of Test Example 1. It is a figure which shows the result after 12-hour progress of the test example 1. FIG. It is a figure which shows the result after 24 hours passage of Test Example 1. It is a figure which shows the result after 36 hours passage of Test Example 1. It is a figure which shows the result after 48-hour progress of the test example 1. FIG.

The food quality inspection method of the present invention includes a first near-infrared light having a first wavelength selected from an absorption wavelength region unique to a measurement target substance, and absorption by the measurement target substance rather than the first near-infrared light. Irradiating the food with the second near infrared light having a second wavelength with a small wavelength, based on the difference between the first near infrared light and the second near infrared light in the reflected light reflected from the food The absorption of the first near-infrared light by the substance to be measured is detected, and the quality of the food is examined. As described above, food such as fish is different from a solution, and even when irradiated with near-infrared light, most of the light is reflected on the surface, and the light that has entered the interior also receives multiple scattering. . The attenuation of light due to reflection on the surface and multiple scattering is several tens of times greater than the attenuation due to absorption of the substance to be measured, and it has been difficult to confirm the absorption of near-infrared light. By using the wavelength, it is possible to eliminate the influence of reflection and multiple scattering, and confirm the change (absorption) of near-infrared light by the measurement target substance of food.

In the food quality inspection method of the present invention, the absorption of the first near infrared light is performed based on the difference between the first near infrared light and the second near infrared light in the reflected light reflected from the food. To detect. Absorption of the first near-infrared light may be detected by the difference between the first near-infrared light and the second near-infrared light in the reflected light reflected from the food, or the difference is statistically processed. The absorption of the first near-infrared light may be detected by performing processing such as analysis processing and image processing. For example, the freshness of food can be graded using processed data.

As a food quality inspection method for performing image processing on the difference between the first near-infrared light and the second near-infrared light in the reflected light reflected from the food, for example, the first near-infrared light is used as the food. And irradiating the food with the first near-infrared light to obtain the first image by photographing the reflected light from the food, irradiating the food with the second near-infrared light, and the second near-infrared light A step of obtaining a second image by photographing reflected light from food of light, and forming an absorption image of the first near-infrared light based on the difference between the first image and the second image; Examples include inspecting food quality.

More specifically, for example, the first optical filter that irradiates the first near infrared light from the first light source to the food and selectively transmits the first near infrared light among the reflected light reflected from the food. The first image is obtained by taking a picture with a camera equipped with. Similarly, by a camera provided with a second optical filter that irradiates the second near-infrared light from the second light source onto the food and selectively transmits the second near-infrared light among the reflected light reflected from the food. A second image is obtained by shooting. Finally, a first near-infrared absorption image is formed based on the difference between the first image and the second image. According to this, the substance to be measured can be confirmed from the absorption image, and the quality of the food can be easily confirmed.

Here, the step of obtaining the first image and the step of obtaining the second image may be performed simultaneously or separately. In the case where the step of obtaining the first image and the step of obtaining the second image are performed separately, for example, the first image is obtained by the first camera having the first optical filter, and the second image is obtained by the second camera having the second optical filter. Although an image may be obtained, the first image and the second image may be obtained in order by exchanging the optical filter attached to the camera and switching the light source.

Hereinafter, the present invention will be described in detail based on embodiments.

(Embodiment 1)
FIG. 1 is a block diagram of a food quality inspection apparatus according to Embodiment 1 of the present invention. As shown in FIG. 1, a food quality inspection apparatus 100 includes a first light source 10A that irradiates food with a first near-infrared light having a first wavelength selected from an absorption wavelength region unique to a measurement target substance. The first spectroscopic means (first optical filter 20A described later) that selectively transmits the first near-infrared light out of the reflected light reflected from the food, and the absorption by the measurement target substance is smaller than the first wavelength, or A second light source 10B that irradiates the food with a second near-infrared light having a second wavelength selected from a region other than the absorption wavelength region, and a second that selectively transmits the second near-infrared light out of the reflected light. Spectroscopic means (second optical filter 20B described later).

The first light source 10A irradiates the food with the first near-infrared light having the first wavelength selected from the absorption wavelength region unique to the measurement target substance. The substance to be measured here refers to a substance that serves as an index for quality inspection of food, and examples thereof include a substance that serves as an index of freshness and a foreign substance. More specifically, examples of the measurement target substance include oxidized myoglobin and oxidized hemoglobin. Myoglobin and hemoglobin contained in fish and the like are oxidized with the passage of time to become oxidized myoglobin and oxidized hemoglobin. That is, in the case of fish meat, when the freshness deteriorates, oxidized myoglobin and oxidized hemoglobin are generated, and near infrared light having an absorption wavelength of oxidized myoglobin, an absorption wavelength of oxidized hemoglobin, and the like is absorbed. Therefore, the quality inspection of food can be performed by using these as substances to be measured.

The second light source 10B irradiates the food with the second near-infrared light having the second wavelength that is less absorbed by the measurement target substance than the first near-infrared light.

As described above, the second wavelength is different from the first wavelength in the absorptance due to the substance to be measured. That is, the second wavelength is a wavelength for removing multiple scattering. Specifically, it is preferable that the second near-infrared light has a smaller absorption than the first near-infrared light and is hardly absorbed by the measurement target substance (non-specific one). . Thereby, the second near-infrared light can be used as a comparative control of the first near-infrared light. In other words, the first near-infrared light can have a measurement wavelength, and the second near-infrared light can have a reference wavelength.

Further, the first near-infrared light and the second near-infrared light preferably have substantially the same biological permeability. For example, the first near-infrared light and the second near-infrared light are It is preferable to have a close wavelength.

For example, the first near-infrared light is assumed to have the maximum absorption wavelength of the measurement target substance, and the second near-infrared light is selected from the absorption wavelength region of the measurement target substance but deviates from the maximum absorption wavelength. What is necessary is just to have a wavelength.

The first light source 10A and the second light source 10B generate predetermined near-infrared light as described above, and it is preferable that the wavelength can be set appropriately according to the substance to be measured. For example, an LD, a light emitting diode (LED), or the like can be used. LD and LED have a relatively strong light amount and can irradiate near infrared light having a desired wavelength. Moreover, there is no possibility of becoming a heat source.

In the present embodiment, it is assumed that the first light source 10A can irradiate near infrared wavelengths near 760 nm, and the second light source 10B can irradiate near infrared wavelengths near 850 nm.

The first spectroscopic means selectively transmits the first near-infrared light among the reflected light reflected from the food. In the present embodiment, the first optical filter 20A capable of selectively transmitting the first near-infrared light is used as the first spectroscopic means. That is, the first optical filter 20A capable of selectively transmitting a near-infrared wavelength of 760 nm was used as the first spectroscopic means.

The second spectroscopic means selectively transmits the second near-infrared light among the reflected light reflected from the food. In the present embodiment, the second optical filter 20B that can selectively transmit the second near-infrared light is used as the second spectroscopic means. That is, the second optical filter 20B that can selectively transmit a near-infrared wavelength of 850 nm was used as the second spectroscopic means.

The reflected light transmitted through the first spectroscopic means passes through the first lens 30A for image formation and is received by the first image sensor 40A. The reflected light transmitted through the second spectroscopic means passes through the first imaging lens 30B and is received by the second image sensor 40B.

The first image sensor 40A receives the reflected light that has passed through the first lens 30A and converts it into a signal, and the second image sensor 40B converts the reflected light that has passed through the second lens 30B into a signal. Examples of the first image sensor 40A and the second image sensor 40B include a CCD element and a CMOS element. In the present embodiment, CCD elements are used as the first image sensor 40A and the second image sensor 40B, respectively.

The signal obtained from the first image sensor 40A and the signal obtained from the second image sensor 40B are sent to the image processing unit 50. The image processing unit 50 uses the signal obtained from the first image sensor 40A as the first near infrared light measurement data, and uses the signal obtained from the second image sensor 40B as the second near infrared light measurement data. Based on these differences, an absorption image of the first near-infrared light is formed. That is, a two-wavelength absorption difference image is formed from the difference between the obtained measurement data of the first near infrared light and the measurement data of the second near infrared light. As described above, the second near-infrared light is less absorbed by the measurement target substance than the first near-infrared light or is not absorbed by the measurement target substance. For this reason, by taking the difference between the measurement data of the first near infrared light and the measurement data of the second near infrared light, the influence of reflection on the food surface, multiple scattering inside the food, and other environmental fluctuations, etc. It is possible to detect the change (absorption) of the first near-infrared light due to the substance to be measured without the influence of the above. Therefore, it is possible to detect the change of the first near infrared light due to the measurement target substance with high accuracy. In the present embodiment, it is possible to visualize the presence / absence and concentration of a measurement target substance in food.

The image processing unit 50 is connected to the image display unit 60 so that the first near-infrared absorption image obtained by the image processing unit 50 can be displayed on the image display unit 60. The image processing unit 50 is connected to the interface 70 so that the first near-infrared absorption image obtained by the image processing unit 50 can be output to an external personal computer (PC) 200 or the like. It has become.

Here, FIG. 2 is a schematic cross-sectional view and a schematic front view of the food quality inspection apparatus of the present embodiment. As shown in FIG. 2, the quality inspection apparatus 100 according to the present embodiment includes a first lens 30A, a first image sensor 40A that captures an image formed through the first lens 30A, a second lens 30B, A second imaging device 40B that captures an image formed through the two lenses 30B and an image processing unit 50 are provided therein, and the first light source 10A, the second light source 10B, the first optical filter 20A, and the second optical filter This is a compound eye camera provided with 20B outside. Specifically, a first optical filter 20A is provided on the front surface of the first lens 30A, and a first light source 10A including four irradiation units 10a is provided so as to surround the first optical filter 20A. ing. In addition, a second optical filter 20B is provided in front of the second lens 30B, and a second light source 10B including four irradiation units 10b is provided so as to surround the second optical filter 20B. Since the quality inspection apparatus 100 according to the present embodiment has the above-described configuration, the focal length of the part to be detected can be arbitrarily adjusted.

When the first near-infrared light and the second near-infrared light are simultaneously irradiated from the first light source 10A and the second light source 10B of the quality inspection apparatus 100 having the above-described configuration, the first near-infrared light is irradiated. A part of the light and the second near-infrared light is absorbed by the food, and a part thereof is reflected. Of the reflected light, only the first near-infrared light passes through the first optical filter 20A, is converted into a signal in the first image sensor 40A via the first lens 30A for image formation, and the second Only near-infrared light passes through the second optical filter 20B and is converted into a signal in the second imaging element 40B via the second lens 30B for imaging. The image processing unit 50 forms a first near-infrared absorption image based on the difference between the signal obtained from the first image sensor 40A and the signal obtained from the second image sensor 40B. The first near-infrared absorption image is displayed on the image display unit 60 (not shown).

Here, the quality inspection using the quality inspection apparatus 100 according to the present embodiment will be briefly described by taking the freshness inspection of raw fish as an example. When fresh fish deteriorates in freshness, oxygenated myoglobin is oxidized into oxidized myoglobin. When the freshness of the raw fish is maintained, the amount of oxygenated myoglobin in the raw fish is large and the amount of oxidized myoglobin is small. However, when the freshness of the raw fish falls, the amount of oxygenated myoglobin in the raw fish changes and is oxidized. The amount of myoglobin increases. Therefore, the raw fish oxidized myoglobin can be used as a measurement target substance and can be used as an index of freshness.

The maximum absorption wavelength of oxidized myoglobin is around 760 nm. That is, the presence of oxidized myoglobin absorbs near infrared wavelengths near 760 nm. In the quality inspection apparatus 100 of the present embodiment, the first light source 10A irradiates the first near infrared light in the vicinity of 760 nm, which is the absorption wavelength peak of oxidized myoglobin, and the second light source 10B has the second light in the vicinity of 850 nm. Near-infrared light was irradiated. Thus, the degree of oxidation of oxygenated myoglobin, that is, the degree of presence of oxidized myoglobin, can be determined from the first near-infrared absorption image, and the freshness of raw fish can be easily inspected.

In this embodiment, the quality inside food can be inspected by using near-infrared light having high biological permeability. And by taking the difference between the measurement data of the first near-infrared light and the measurement data of the second near-infrared light, it is influenced by reflection on the food surface, multiple scattering inside the food, and other environmental fluctuations. It is possible to detect the change (absorption) of the first near-infrared light due to the measurement target substance with high accuracy by eliminating the influence. Therefore, the quality of food can be inspected with high accuracy.

In this embodiment, the absorption image data of the first near-infrared light can be obtained with one operation, and the quality can be inspected by confirming the absorption image immediately after the measurement. As described above, the quality of the food can be easily confirmed by the image, and the quality of the food can be inspected quickly and easily. Therefore, the quality can be inspected without selecting a place.

In this embodiment, a wide range of food quality can be easily confirmed.

In addition, since the quality of food can be inspected continuously, it is possible to easily inspect changes in freshness with time.

Since the quality inspection apparatus 100 of this embodiment is a non-contact type, it can be reduced in size and weight. The downsized and lighter quality inspection device is easy to carry and can easily inspect food quality at any time during transportation, storage, store display, etc. of food.

In addition, by using near-infrared light with high biological permeability, the strength of the light source and the sensitivity of image sensors such as CCD elements can be increased even for foods that are frosted or in food in a styrofoam tray. Therefore, quality inspection can be performed even for food in a display state or a packaged state.

Hereinafter, specific examples will be described, but the present invention is not limited thereto.

(Test Example 1)
The quality inspection of beef (sirloin) was performed by the food quality inspection method of the present invention. In addition, beef (sirloin), which has a shelf life of 48 hours, was purchased and stored in a control room temperature controlled at 20 ° C., and quality inspection was performed at 12 hour intervals after purchase.

Specifically, first, 760 nm CCD camera images were obtained by irradiating beef with near-infrared light of 760 nm from the first light source and photographing the reflected light transmitted through the first optical filter with a CCD camera. The first optical filter can selectively transmit a near-infrared wavelength of 760 nm.

Next, 850 nm CCD camera images were obtained by irradiating beef with near-infrared light of 850 nm from a second light source and photographing the reflected light transmitted through the second optical filter with a CCD camera. The second optical filter can selectively transmit a near infrared wavelength of 850 nm.

Finally, a 760 nm absorption image was formed by subtracting the 760 nm CCD camera image and the 850 nm CCD camera image.

As described above, the maximum absorption wavelength of oxidized myoglobin is 760 nm, and the reference wavelength (second wavelength) is 850 nm where the absorption of oxidized myoglobin is small.

[Quality inspection measurement conditions]
1. By arranging a circular reflector (calcium carbonate plate with high reflectivity) on the beef surface and equalizing the brightness of the reflectors in the spectrum profile graphs of 760 nm and 850 nm, the image of the 760 nm CCD element (first image sensor 40A) and A quality inspection was performed by creating an absorption image so that the luminance of the image of the 850 nm CCD element (second imaging element 40B) was equal.
2. Quality inspection was performed at 20 ° C.
[Image processing]
1. The pseudo color display image is a pseudo color image for the purpose of making the absorption image easier to see.
2. Image capturing, subtraction processing, and creation of a pseudo color display image were performed in 12 bits by image processing software (Image Pro Plus Ver. 6.3.1; manufactured by Media Cybernetics, USA).

The color camera images in the table were taken with a general color camera different from the food quality inspection apparatus according to the first embodiment.

3 to 7 show color camera images, 760 nm CCD camera images, 850 nm CCD camera images, absorption images, and pseudo color display images after the start of measurement, after 12 hours, 24 hours, 36 hours, and 48 hours. Show. In addition, the spectral profile graph of the brightness | luminance of each image was attached | subjected to the 760 nm CCD camera image and the 850 nm CCD camera image.

3 to 7 are absorption images having a near infrared wavelength having a wavelength of 760 nm obtained from a difference between a signal obtained from a 760 nm CCD element and a signal obtained from an 860 nm imaging element. That is, an absorption image of oxidized myoglobin.

By comparing FIG. 3 with FIGS. 4 to 7, it can be confirmed that the oxidized myoglobin increases even within 48 hours of the shelf life. In particular, the pseudo color display image can clearly determine the increase in oxidized myoglobin, and can easily determine the freshness of the meat.

Specifically, by comparing FIG. 3 and FIG. 4, it can be seen that a slight increase in oxidized myoglobin after 12 hours can also be determined. Further, by comparing FIG. 3 and FIG. 5, it can be seen that the oxidized myoglobin increased significantly after 24 hours. In particular, in the pseudo color display image, red is strong and it can be clearly determined that the oxidized myoglobin is greatly increased.

From the above, it was confirmed that according to the food quality inspection apparatus of the present invention, the quality of food can be easily inspected with high accuracy.

(Other embodiments)
As mentioned above, although one Embodiment of this invention was described, this invention is not limited to what was mentioned above. For example, the quality inspection apparatus 100 according to the first embodiment includes the image display unit 60, but may not include the image display unit. In this case, what is necessary is just to comprise so that an absorption image can be confirmed by other image display parts, such as an external personal computer (PC). In the present embodiment, an optical filter is used as the spectroscopic means. However, the present invention is not limited to this. For example, a spectroscope including a condensing lens and a diffraction grating may be used.

In the above-described embodiment, the first light source 10A that irradiates the food with the first near-infrared light having the first wavelength selected from the absorption wavelength region unique to the measurement target substance, and the first near-infrared light The second light source 10B that irradiates the food with the second near-infrared light having the second wavelength, which is less absorbed by the measurement target substance, is not limited thereto. For example, one light source that can irradiate the first near infrared light having the first wavelength and the second near infrared light having the second wavelength may be used.

The food quality inspection apparatus of the present invention can be suitably used for quality inspection of foods such as meat, fish, fruits, vegetables, and grains. The quality inspection apparatus of the present invention can perform other freshness inspections, protein distribution inspections, foreign object inspections, and the like. For example, it is assumed that the first near-infrared light has a first wavelength selected from the absorption wavelength region of a specific protein, and the second near-infrared light has a second wavelength that is less absorbed by the protein than the first wavelength. By having it, it is possible to perform a protein protein distribution test. Further, the first near infrared light has a first wavelength selected from the absorption wavelength region of the foreign matter, and the second near infrared light has a second wavelength that is less absorbed by the foreign matter than the first wavelength. By doing so, it is possible to inspect for the presence of foreign matter.

10A,

10B Light source

10a,

10b Irradiation unit

20A,

20B Optical filter

30A,

30B Lens

40A, 40B Image sensor 50 Image processing unit 60 Image display unit 70 Interface 100 Quality inspection device

Claims

A first light source that irradiates food with a first near-infrared light having a first wavelength selected from an absorption wavelength region specific to the substance to be measured;
A second light source that irradiates the food with a second near-infrared light having a second wavelength that is less absorbed by the substance to be measured than the first near-infrared light;
A first spectroscopic means for selectively transmitting the first near-infrared light among the reflected light reflected from the food;
Second spectroscopic means for selectively transmitting the second near-infrared light of the reflected light;
A first image sensor that images reflected light transmitted through the first spectroscopic means;
A second imaging element that images reflected light transmitted through the second spectroscopic means;
An image processing unit,
The first light source and the second light source operate simultaneously;
The image processing unit forms a first near-infrared absorption image based on a difference between a signal obtained from the first image sensor and a signal obtained from the second image sensor. Quality inspection equipment.
First near-infrared light having a first wavelength selected from an absorption wavelength region peculiar to the measurement target substance and a second wavelength having a second wavelength that is less absorbed by the measurement target substance than the first near-infrared light. A light source for irradiating the food with two near infrared lights;
A first spectroscopic means for selectively transmitting the first near-infrared light among the reflected light reflected from the food;
Second spectroscopic means for selectively transmitting the second near-infrared light of the reflected light;
A first image sensor that images reflected light transmitted through the first spectroscopic means;
A second imaging element that images reflected light transmitted through the second spectroscopic means;
An image processing unit,
The image processing unit forms a first near-infrared absorption image based on a difference between a signal obtained from the first image sensor and a signal obtained from the second image sensor. Quality inspection equipment.
The food quality inspection apparatus according to claim 1 or 2, wherein the measurement target substance is oxidized myoglobin or oxidized hemoglobin, and the second wavelength is a wavelength for removing multiple scattering.
The food quality inspection apparatus according to any one of claims 1 to 3, further comprising an image display unit that displays an absorption image of the first near-infrared light.
A first near-infrared light having a first wavelength selected from an absorption wavelength region unique to the measurement target substance, and a second wavelength having a second wavelength that is less absorbed by the measurement target substance than the first near-infrared light. The measurement object substance based on a difference between the first near-infrared light and the second near-infrared light in the reflected light reflected from the food. Detecting a change in the first near-infrared light according to the above, and inspecting the quality of the food.
Irradiating the food with the first near-infrared light and obtaining a first image by photographing the reflected light from the food of the first near-infrared light; and
Irradiating the food with the second near-infrared light, and obtaining a second image by photographing the reflected light from the food of the second near-infrared light,
6. The food quality according to claim 5, wherein the quality of the food is inspected by forming a first near-infrared absorption image based on the difference between the first image and the second image. Inspection method.