JP2729391B2 - Rice grain quality determination method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial applications]

The present invention relates to a rice grain quality determination method for determining the quality of brown rice, white rice, or paddy rice.

[Prior art]

Grains such as rice grains are inspected in accordance with agricultural product standards based on the agricultural products inspection method, and grades are determined in comparison with standard products. This inspection is performed by an agricultural inspector. Inspectors are dedicated to those who are familiar with grain inspections,
Trained to always make the right grades,
Not perfect due to visual inspection. Therefore, for example, Japanese Unexamined Patent Publication No.
There is 25664, and as the same method, it is disclosed in JP-A-57-153249 or JP-A-62-150141. That is, Japanese Unexamined Patent Publication No. 56-125664 discloses a method of irradiating brown light of each grain with visible light and measuring the amount of reflected light and transmitted light of the light, thereby regulating the grain size of brown rice. Milk white grain, blue rice, brown rice or brown rice is a grain quality discriminating device for trying to discriminate between brown rice, Japanese Patent Application Laid-Open No. 57-153249, irradiates a light of any wavelength to each grain of brown rice. In this method, the transmittance is measured, and the transmittance is compared with a predetermined threshold to determine whether or not the grains are defective. Japanese Unexamined Patent Publication No. Sho 62-150141 discloses a method of irradiating light to each grain of brown rice, the amount of diffuse transmitted light and the amount of diffuse reflected light, the amount of diffused reflected light at any two wavelengths, and two positions for each grain of brown rice. And calculates the ratio of the amount of diffuse transmitted light to the amount of diffuse reflected light, the ratio of the amount of light of any two wavelengths in the diffuse reflected light, and the ratio of the amount of transmitted light at two positions for each brown rice grain. Then, determine the ratio of each light amount and adjust the quality of brown rice, sizing, belly white, milky white grains, blue immature grains, body split grains, damaged grains,
This is a method for distinguishing between colored grains, blue dead grains and white dead grains.

[Problems to be solved by the invention]

However, in these conventional apparatuses and methods, a detection item serving as a criterion for quality determination is a single data element consisting only of the amount of reflected light and the amount of transmitted light, and accurate determination cannot be made. In other words, even if the grains are sized (normal grains), they may not be discriminated as sized from the variety, the production area, or the growth conditions, and high-precision determination cannot be expected. For example, the frequency distribution of brown rice of each grade, such as foreign matter, colored grains, and powdery substances, is shown in FIG. 8, and each brown rice overlaps in the X-axis direction (brightness = reflected light amount). However, it is not possible to make an accurate determination for each quality. SUMMARY OF THE INVENTION In view of the foregoing, it is a technical object of the present invention to provide a rice grain quality determination method that can more accurately determine the quality of rice grains.

[Means for Solving the Problems]

In order to solve the above problems, in the present invention, the rice grains supplied from the rice grain supply hopper are flowed by a vibrating grain trough, and a step is inclined in the traveling direction of the bottom surface of the grain feeding groove provided in the grain trough. When the rice grains pass through the slit of the grain trough by aligning and flowing the rice grains, the reflected light amount measurement unit using visible light and the transmitted light amount measurement unit using infrared light measure the reflected light and transmitted light of the rice grains at the same position. The measured value is digitally processed by the arithmetic and control unit, and the average value of the transmitted light, the average reflected light amount, the light amount of the brightest point, and the light amount of the darkest point are obtained based on the digitally processed values of the reflected light and the transmitted light obtained in the above processing. , The light amount of the difference between the brightest point and the darkest point, the area of a region brighter than the average transmitted light amount or the average reflected light amount by a certain amount or more, the area of the region darker than the average transmitted light amount or the average reflected light amount by a certain amount or more, the general shadow area And ellipse Measurement and calculated for each item of the shape, and a means for solving the above problems by rice grain quality determination method of determining a plurality of quality by combining these measurements and calculation values as appropriate.

[Action]

Digital processing by the arithmetic and control unit of a time-varying value of the measurement value measured by the reflected light amount measuring unit and the transmitted light amount measuring unit, that is, the waveform measured by the measuring unit when the rice grain passes through the measuring unit is performed in minute units. The change in the waveform can be used as a plurality of pieces of information as a feature of the waveform. However, in the conventional analog system, one waveform can be regarded as only one information. Further, the plurality of pieces of information obtained by the digital processing are arithmetically processed, and the average transmitted light amount, the average reflected light amount, the light amount of the brightest point, the light amount of the darkest point, the light amount of the difference between the brightest point and the darkest point, and the average transmission metric Alternatively, there is an area of a region that is a certain amount or more than the average reflected light amount, an area of a region that is a certain amount or more darker than the average transmitted light amount or the average reflected light amount, a total projected area, an elliptical shape, and the like. By performing the above, it is possible to improve the accuracy in obtaining the ratio of skin misalignment grains, immature grains, and damage, which are the basis for determining the grade of rice.

【Example】

The configuration of the present embodiment will be described with reference to FIGS. 1 to 3, 7, and 10. FIG. First, the first embodiment will be described. Reference numeral 1 denotes a rice grain quality determination device of the present invention. A sample supply hopper 21 supported by a support frame 11 at the upper left side of the machine frame 10 and a valve 22 for discharging an appropriate amount of a sample below the hopper.
And a pulley 24 axially mounted on the rotary shaft 23 of the valve,
A pulley 27 mounted on a rotation shaft 26 of a drive motor 25 supported by the support frame 11, and a timing belt 28 wound around the pulley
And the valve 22 drives the drive motor 25
And the valve unit with the supply hopper 21
Form 20. Further, a scattering prevention cover 29 is provided so as to be in contact with the outer periphery of the valve 22 from below the supply hopper 21 inside the valve unit 20. The valve 22 has grooves at arbitrary intervals in the direction of the rotation axis on the circumference of the valve so as to intermittently discharge the sample.
Form 30. The sample discharged from the valve unit 20 is
A grain feed that flows to the supply side of a vibrating grain feed gutter (hereinafter referred to as “feed feeder”) 40 formed with a plurality of grain feed grooves 41 provided thereon, and is connected to the discharge side of the feed feeder 40 in a related manner. Gutter
50 are provided. The sample that has passed through the grain feed trough 50 flows to a vibrating grain feed trough (hereinafter, referred to as a “selection feeder”) 60 that is connected to the grain feed gutter 50 different from the feed feeder 40. At an arbitrary position of the sorting feeder 60, a sorting device 80 for sorting low quality, for example, skin shift grains, body split grains, colored grains, dead rice, etc., is suspended. The sample flowing through the sorting feeder 60 is discharged out of the machine from a discharge port 86 on the discharge side of the sorting feeder 60. The low-quality sample among the samples is sorted by the sorting device 80, and is discharged to the outside of the machine from a discharge port (not shown) different from the discharge side of the feeder 60 through the transport pipe 83. The feed feeder 40 and the sorting feeder 60 are respectively fixed to the bases 43 and 63 and the machine frame 10 with vibration-insulating rubbers 42 and 62 interposed therebetween, and are further inclined forward in the traveling direction to the feed feeder 40 and the sorting feeder 60. One or several steps 45, 65 to be bridged are formed. (FIG. 2) Next, the light quantity measuring device 120 will be described in detail. A light source 91 made of visible light is provided at a position before and after the slit 53 provided in the grain feeding gutter 50 at a position above the grain feeding gutter 50, and a cover 93 having a slit 92 provided on an outer periphery of an upper portion of the light source 91 is provided. Further, a light source 101 made of infrared light is provided below the feeding trough 50 below a slit 53 provided in the feeding trough 50. Further, a condensing lens 94, a reflected light amount detecting element 96 composed of a linear image sensor, and an orthogonally extending portion on a vertical line passing through the slit 53 and the center of the slit 92 with respect to the grain feeding gutter surface 52. Transmitted light amount detection element consisting of linear image sensor in direction
106, an infrared light cut filter 97 for the reflected light amount detecting element 96, a visible light cut filter 107 for the transmitted light amount detecting element 106, and a coarse 45 ° inclination with respect to the vertical line. There is provided a light quantity measuring unit 90 comprising a half mirror 102 placed at the intersection of the optical axis of the element 106 and the optical axis of the reflected light quantity detecting element 96. The light quantity detection elements 96 and 106 have a built-in linear image sensor array in which 4096 linear image sensors are arranged side by side, and the properties of the rice grains due to transmission and reflection when the rice grains pass through the slits of the grain feeding gutter 50 are linear images. An image is formed on the sensor. The light source 91, the light source 101, and the light amount measuring unit 90 form the light amount measuring device 120. Here, the condensing lens 94 is provided with the down stream groove 54 of the grain feeding trough 50.
The same number as above, or one for a plurality of the
It can also be provided at the rate of individual pieces. Next, the sorting device 80 will be described in detail (see FIG. 3).
The sorting device 80 makes the suction port 82 of the suction pipe 81 face each groove of the sorting feeder 60. The suction pipe 81 is provided so as to hang at a right angle to the transport surface of the sorting feeder 60. Each suction tube 81
The upper end of the is connected to the transport pipe 83 which is laid substantially horizontally,
Both the suction pipe 81 and the transport pipe 83 have an inner diameter through which rice grains can pass. In addition, one end of each transport pipe 83 is connected to an air compressor (not shown), and the other end faces a rice grain receiving box placed in an appropriate space inside and outside the machine frame 10. Each transfer pipe 83 is provided with an electromagnetic valve 84 on the air compressor side of the suction pipe 81, and each electromagnetic valve 84 is formed so as to be operated by an output signal from the arithmetic and control unit 113. In each transfer pipe 83, there is a solenoid valve
A nozzle portion 85 is provided immediately before the compressed air blown by the operation of 84 to reach the mounting portion of the suction pipe 81, and an ejector (ejec) is provided.
tor). Accordingly, the arithmetic and control unit 113 analyzes the measurement value of the light quantity measuring device 120, and when a certain rice grain is determined to be a low-quality grain, the solenoid valve 84 is operated by a signal from the arithmetic and control unit 113, and compressed air is discharged from the nozzle. Pass through part 85.
At this time, the pressure in the suction pipe 81 becomes low, and the rice grains are sucked into the suction port.
It sucks in from 82 and conveys it to a rice grain receiving box by a conveying pipe 83. A large number of ventilation holes 51 may be provided at the bottom of each groove of the sorting feeder 60, and air may be sucked from below the groove so that rice grains other than the split kernels are not sucked. Next, the configuration of the arithmetic and control unit will be described with reference to FIG.
The reflected light amount measuring element 96 and the transmitted light amount measuring element 106 are A
It is connected to the arithmetic and control unit 113 via the / D conversion 111 and the differentiation circuit 112. The arithmetic and control unit 113, the A / D converter 111 and the differentiating circuit 112 constitute an arithmetic and control unit 110. Also an arithmetic and control unit
The selection device 80, the drive motor 25 of the supply valve 22, the feed feeder 40 and the selection feeder 60 are connected to 113. Here, the A / D converter 111 will be described in detail with reference to the block diagram of FIG. 10 .The linear image sensor array 90 draws a cut surface of rice grains on the slit 53 of the grain feeding gutter 50 at a certain moment. The linear image sensor array 90 is connected to a whiteness measurement A / D converter 70 and a general A / D converter 71, and the whiteness measurement A / D The D converter 70 is connected to a gray value averaging device 73 via an image normalizing device 72, and the general A / D converter 71 is connected to a general comparator 75 via an image normalizing device 74. The general comparator 75 and the gray value averaging device 73 are connected to the arithmetic and control unit 113 via the encoder 76. The operation in the above configuration will be described. Supply hopper 21
And the arithmetic and control unit 113 activates the valve 22, the feeder 40 and the sorting feeder 60. The rice grains of the sample are discharged to the input section of the feeder 40 by the rotation of the valve 22, and the light amount measuring device 12 is
Flows to zero. Next, the rice grains are thrown into the grain trough 50 of the light quantity measuring device 120. At this time, the rice grains pass on the slit 53 of the grain feeding gutter 50 in the longitudinal direction. The time required at this time is 10 ms. When the light quantity measuring section 100 starts the measurement, the light quantity measuring section measures the transmission and reflection light quantity of the slit 92 provided in the light quantity measuring section in each of the grooves in a predetermined order.
Here, the feeder 50, feeder 40, and feeder for sorting
Although it depends on the number of grooves provided in each of the grooves 60, the time required to measure the light amount of each groove from the slit 92 once is 1.5 ms. That is, one rice grain is slit 9
Each light quantity measurement unit can obtain 20 measurement signals during 10 ms passing through 2. These 20 measurement signals are used as a measurement signal for one rice grain, which is significantly different from a known rice grain quality determination device. Now, the mixed light amount of reflection and transmission obtained through the slit 92 is divided by the half mirror 102 into the optical axis direction and the direction perpendicular to the optical axis. The light amount divided in the optical axis direction passes only visible light by the infrared light cut filter 97 and is measured by the reflected light amount detecting element 96 as the reflected light amount of rice grains.
On the other hand, the light amount divided in the direction perpendicular to the optical axis passes only infrared light by the visible light cut filter 107 and is measured by the transmitted light amount detecting element 106 as the transmitted light amount of rice grains. Here, items to be detected by the linear image sensor array 51 will be described. First, the reflected light is A: average reflected light amount, B: light amount of the brightest point, C: light amount of the darkest point, D: light amount of the difference between the brightest point and the darkest point, E
... Area of a region brighter than the average reflected light amount by a certain amount or more, F ...
The area of a region darker than the average reflected light amount by a certain amount or more, G: total projection area, and H: elliptical shape. The transmitted light is a: average transmitted light amount, b: light amount of the brightest point, c: light amount of the darkest point, d: light amount of the difference between the brightest point and the darkest point, e: lighter than the average transmitted light amount by a certain amount or more. Area of the area, f: Area of the area darker than a certain amount from the average transmitted light amount The analysis category for judging rice grain (brown rice) quality obtained by combining these detection values is:
Perfectly good, non-skinned, non-skinned particles: brown rice peeled or released, with an area of 1
the area of one side of mm ² or more at 8 mm ² following ones (1 grain is 14
15 mm ² and is), immature grains ... white opaque portion to the central portion (powdery substance) of certain white core particle, the area of the ventral white particle (both powdery substance which is white opaque portion to the abdomen and the back is 4 mm ² ~ 8 mm ² ) or insufficiently full grains, the fruit part is green and the powder is green, immature blue immature grains, damaged grains ... Damaged grains other than body split grains described below, insect damage grains, germinated grains, disease Tablets, bud rot grains, tea rice refers to such砕粒(1 / 3-2 / 3 to sizing area), the size of the colored portion or 0.5 to 1.0 mm ^2, or the particle size is sieved 1/4 ~ 2/3
(4 to 10 mm ² ), dead rice: The size of the granular part is more than 1/2 (8 mm ² ) of the grain, and there are white dead and blue dead rice. Colored grains: insect, heat , all or part of the grain surface by molds or bacteria refers to one exhibiting a brown or black color, the size of the colored portion is 1 mm ² or more of, or the amount of reflected light than 70% of normal grains (i.e., whole grain Colored)),
Foreign matter: grains other than rice grains to be measured, earth and sand, and the like. The relationship between the detection items and the analysis categories is as shown in Tables 1 and 2, wherein the sized and skin misaligned grains are analyzed by all the detection items, and the other analysis categories are formed by appropriately combining the detection items. It is done together. As described above, each light quantity measuring element digitally processes one of the 20 measurement signals of one rice grain obtained from the slit 92, and plots the time t on the horizontal axis and the signal level V of the measurement signal on the vertical axis. Then, it becomes as shown in FIG. The time T is obtained by the length of the rice grain in the width direction. Vd o'clock display T ₀ in the figure is shown that the amount of transmitted light only the portion that is decreasing, this alone is determine by what whether split or coloring due to skin displacement is impossible. FIG. 6 shows the reflected light amount measurement signals simultaneously obtained from the same rice grain. Ve at T _{0 in the} figure
Shows that the amount of reflected light is increased only in that part, so it can be understood that the rice grain surface in that part looks whiter than other rice grain surfaces, and in combination with FIG. It can be determined that there is. Further, when the signal of the same reflected light amount measuring unit is to be had been Figure 6, part of the time in the drawing T ₀ can understand that the same Vf only reflected light and transmitted light quantity measurement signal is reduced, the fifth transmitted light quantity In combination with the figure, this rice grain can be found to be a colored grain. As described above, while one rice grain passes through the slit, the signals obtained from the reflected light quantity measurement signal and the transmitted light quantity measurement signal are each digitally processed, the waveform is analyzed, and the rice grain is determined by the combination of the two light quantity measurement signals. Is easy and accurate. FIG. 6 shows an example of a cross-sectional measurement signal of the rice grain of the amount of reflected and transmitted light when each of the sized, skin-displaced, broken and colored grains has passed. The above description is merely a cross-sectional view of a rice grain, and the gist of the present invention is to process a signal of 20 times of one rice grain captured by each linear image sensor as an image of the whole rice grain. . In other words, when the signals shown in FIG. 5 are continuously analyzed for one rice grain (in this case, 20 times), which part of the whole rice grain has any skin shift or coloring, and the size of the whole rice grain Well,
The color of the whole rice grain can be found from the signal. This is because the digitally processed signal is regarded as one pixel, and the whole rice grain is transferred to a sensor as if viewed by human eyes, and the signal is processed. The signal obtained by the light quantity measurement is processed by the arithmetic and control unit 113 as described above to determine the quality of rice grains. For example, the measurement of the average reflected light amount (A) is performed by using data from the linear image sensor array 90 as an A / D for whiteness measurement.
After being processed by the converter 70 and the image normalizing device 72, they are averaged by the gray value averaging device 73 and input to the arithmetic and control unit 113 via the encoder 76, and the average of the reflected light amount of the whole rice grain is calculated. The signals processed by the general-purpose A / D converter 71 and the image normalizing device 74 are processed by the general-purpose comparator 75 in accordance with the data from the linear image sensor array 51, in accordance with the analysis categories in Table 1. And arithmetic and control unit
The whole rice grain is analyzed by 13 and discriminated into one of the analysis categories. These are processed at the same speed as the scanning of the linear image sensor array 90. Next, when the rice grains determined to be of low quality based on this result pass under the sorting device 80, the order of the passing rice grains and the average passing time are stored.
The electromagnetic valve 84 is actuated by the signal from 3, and is sucked from the suction port 82 and is conveyed to the rice grain receiving box by the conveying pipe 83. Next, another embodiment of the light quantity measuring device 120 will be described with reference to FIG. However, the same parts as those in the first embodiment are denoted by the same reference numerals, and the different parts from the first embodiment, that is, the configuration and operation of the light amount measuring device will be described. First, a slit 53 provided in the grain feeding gutter 50 is provided above the grain feeding gutter 50.
A light source 91 made of visible light and a light source
Cover 93 with slit 92 surrounding the upper periphery of 91
In addition, a light source 101 made of infrared light is provided below the feeding trough 50 below a slit 53 provided in the feeding trough 50. Further, the condenser lens 94, the reflected light amount detecting element 96, and the transmitted light amount detecting element 106 in a direction perpendicular to the perpendicular line passing through the slit 53 and the center of the slit 92 on an arbitrary perpendicular line to the inclined surface 52. And has a coarse inclination of 45 ° with respect to the perpendicular,
A light quantity measuring unit 100 including a dichroic mirror 103 whose center is located at the intersection of the optical axis of the transmitted light quantity detecting element 106 and the optical axis of the reflected light quantity detecting element 96 is provided. The light source 91, the light source 101, and the light amount measuring unit 100 form a light amount measuring device 120. Next, the operation of the light quantity measuring device 120 in the second embodiment will be described. The mixed light amount of the reflection and transmission obtained through the slit 92 is divided by the dichroic mirror 103 into an optical axis direction and a direction perpendicular to the optical axis.In the optical axis direction, for example, light of 400 nm to 700 nm is emitted. The light of 1000 nm to 1500 nm is respectively split in the direction perpendicular to. The light amount divided in the optical axis direction is visible light, and is measured by the reflected light amount detecting element 96 as the reflected light amount of the rice grain. On the other hand, the light amount divided in the direction perpendicular to the optical axis is infrared light, and is measured by the transmitted light amount detecting element 106 as the transmitted light amount of rice grains. The respective amounts of reflected and transmitted light measured in this way are subjected to arithmetic processing by the arithmetic processing unit in the same manner as in the first embodiment to determine the quality. In the embodiment according to the present invention, the light amount measuring unit has been shown as an integral structure with one condensing lens using a half mirror or a dichroic mirror. However, one point on the grain feeding gutter is used for transmission and reflection. 2 using separate condenser lenses
Needless to say, it is also possible to measure from several places. The rice grain quality discrimination method of the above configuration and action makes it possible to provide many discrimination criteria by incorporating a large number of data for discriminating rice grains at the same position on the grain feeding gutter,
The method of discriminating by taking in one signal from one rice grain as in a known device is a method in which the discrimination accuracy is greatly improved.

【The invention's effect】

As described above, according to the present invention, the signal of the measuring unit, which is also referred to as the heart of the rice grain quality discriminating apparatus, is doubled by a plurality of pieces of information by digital processing and further two kinds of information by reflection and transmission. The whole rice grain is very accurate as compared with the discrimination based on a single data, and it is possible to quickly perform accurate classification discrimination instead of the inspection by the rice inspector.

[Brief description of the drawings]

FIG. 1 is a block diagram of the present invention, FIG. 2 is a side view of a feed and sorting feeder, FIG. 3 is a perspective partial view of a sorting device, FIG. 4 is a block diagram, and FIG. 6, FIG. 6 is a pattern diagram based on a combination of reflected light and transmitted light, FIG. 7 is a sectional view taken along the line AA of the feeder and sorting feeder, FIG. 8 is a frequency distribution diagram, and FIG. 9 is a diagram of the second embodiment. FIG. 10 is a detailed block diagram of A / D conversion. 1 ... rice grain quality discriminating device, 10 ... machine frame, 20 ... valve unit, 21 ... supply hopper, 22 ... valves, 23, 26 ...
... Rotary shaft, 24,27 ... Pulley, 25 ... Drive motor, 28
…… Timing belt, 29 …… Splash prevention cover, 30 ……
Groove, 40 …… Feed feeder, 41,61 …… Grain feed groove, 42,62
…… Vibration isolation rubber part, 43,63 …… Base part, 45,65 …… Step, 50…
… Graning gutter, 51… Ventilation hole, 52… Groughing gutter surface, 53 …… Slit, 60 …… Sorting feeder, 70 …… A / D converter for whiteness measurement, 71 …… General A / D converter, 72 …… Image normalizing device, 73 …… Gray value averaging device, 74 …… Image normalizing device,
75: General comparator, 76: Encoder, 80: Sorting device,
81: Suction tube, 82: Suction port, 83: Conveying tube, 84: Solenoid valve, 85: Nozzle unit, 86: Discharge port, 90: Light intensity measuring unit, 91, 101: Light source, 92: ... Slit, 93 ... Cover,
94: Condensing lens, 96: Reflected light amount detecting element, 97: Infrared light cut filter, 100: Light amount measuring unit, 102: Half mirror, 103: Dichroic mirror, 106: Transmitted light amount detecting element , 107 ... Visible light cut filter, 110
…… Calculation control unit, 111 …… A / D conversion, 112 …… Differentiation circuit, 1
13 ... Calculation control device, 120 ... Light amount measurement device.

Claims (1)

(57) [Claims] 1. A vibrating grain gutter provided with a grain feeding groove for flowing rice grains is installed horizontally, and a rice grain supply section is provided on a supply side of the vibrating grain gutter. A light source composed of visible light that irradiates rice grains from above the grain sending gutter in front of and behind the grain sending gutter relative to the slit, and a slit below the grain sending gutter below the grain sending gutter below the grain sending gutter. A light source composed of infrared light to be irradiated through the light source, a light amount measuring unit including a reflected light amount measuring unit and a transmitted light amount measuring unit in the upper part of the grain sending trough in relation to the slit of the grain sending trough, and a measured value of each of the measuring units. The arithmetic control unit that performs arithmetic processing on the rice grains to determine the quality of the plurality of rice grains, irradiates the rice grains sequentially conveyed by the grain feeding gutter with light, and sets the linear image sensor of the light amount measurement unit to be orthogonal to the direction in which the rice grains are transported. Computational System of Rice Grain Quality Discriminator Scanning Linearly in One Direction In the unit, the temporal change of each signal of the reflected light amount measuring unit and the transmitted light amount measuring unit obtained from one rice grain by the scanning is digitally processed, and the average value of the transmitted light, the average reflected light amount, Light point light amount, darkest point light amount, light amount of difference between brightest point and dark point, area of area brighter by a certain amount or more than the average transmitted light amount or average reflected light amount, and also fixed amount more than average transmitted light amount or average reflected light amount Measurement and measurement of the dark area, total projected area, and elliptical items
Calculate, and perform the analysis for each judgment category that is the basis of the quality judgment by appropriately combining these measured and calculated values,
A method for determining the quality of rice grains, wherein the quality of the sample is determined based on the analysis result.