JP4358918B2 - Cavity fruit judging method and device by visual inspection of Saijo - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method and an apparatus for detecting the presence or absence of internal voids from the appearance inspection of Saijo.
[0002]
[Prior art]
Agricultural cooperatives or producer associations across the country, such as Saijo Shugo shipping facilities, comprehensively evaluate the quality of Saijo by the expert judge, such as the outer shape, scratches, and internal cavities. Based on this evaluation, they are graded and shipped to Saitama. If there is a problem with the appearance of Saijo's grade, for example, scratches and outlines can be clearly deducted depending on the degree, but in the case of a hollow fruit with a hollow inside, a sound test by a skilled worker is performed. The determination is extremely difficult.
[0003]
[Problems to be solved by the invention]
X-ray inspection equipment can be used to detect a void fairly accurately by taking a transmission image of the inside of Saijo. However, irradiating food with X-rays cannot be used because it gives consumers a bad impression. In addition, ultrasonic inspection can detect the void fairly accurately, but in the case of ultrasonic, it is necessary to apply a high-viscosity test solution to the surface of Saijo and wipe it off after the test, which increases the test time. It is not preferable to apply such a test solution to food.
[0004]
The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a hollow fruit determination device based on the appearance inspection of Saijo, which captures the appearance and analyzes the data to detect the hollow fruit.
[0005]
[Means for Solving the Problems]
To achieve the above object, in the invention of claim 1, the inside when the specular reflected light imaged by illuminating the vine root portion or the flower fall of watermelon from above, an image flashed substantially circular obtained cavity It is determined that it is not a fruit, and when an image shining in a ring shape is obtained, it is determined as a hollow fruit.
[0006]
In the case of hollow fruits with a void inside the watermelon, the root of the vine and the flower fallen part often dent, so the shape of these places is examined. When the images taken by applying illumination to these places have no dent and are spherical, an image shining in a substantially circular shape is obtained, and when there is a dent, an image shining in a ring shape is obtained. It is determined that there is a hollow fruit inside the ring-shaped image.
[0007]
In invention of Claim 2, the illuminating device which illuminates the vine root part or flower fall part of a western foot from above , the imaging device which images the regular reflection light from the western foot illuminated with this illuminating device, and from this imaging device An image processing device that generates a binary image from an image, and if the circular image appears in the binary image, it is determined that the interior is not a hollow fruit, and if a ring-shaped image appears , Comprises a determination device for determining a hollow fruit.
[0008]
The base of the vine or the flower fallen part of the vine is illuminated with the lighting device, and this place is imaged with the imaging device. The image processing device converts the captured image into a binary image, and the determination device determines that the inside is not a hollow fruit when a circle appears in the binary image, and the inside is a cavity when a ring-shaped image appears. Judge as fruit.
[0009]
According to a third aspect of the present invention, the determination device measures the maximum inner diameter of the ring-shaped image, and determines that it is a hollow fruit when it exceeds a predetermined reference.
[0010]
Since there is a correlation between the maximum inner diameter of the ring and the size of the void, when the maximum inner diameter of the ring is equal to or greater than a predetermined reference value, it is determined as a hollow fruit.
[0011]
According to a fourth aspect of the present invention, when the binary image is an image with a broken ring, the image processing device creates an image when the ring is formed by a fattening process, and the determination device is fattened. The maximum inner diameter of the ring-shaped image obtained by the processing is measured, and when it exceeds a predetermined reference , it is determined that it is a hollow fruit.
[0012]
The ring may be cut off due to unevenness on the surface of the west side. At this time, the maximum inner diameter of the ring when the ring is formed by thickening is obtained, and when this value is equal to or greater than a predetermined reference considering the amount of thickening, it is determined that the fruit is a hollow fruit.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows the configuration of this embodiment. The root part or flower drop part of the vine of the west side 1 is made upward, and a ring-shaped illuminator 2 is provided above this. In the present embodiment, a fluorescent lamp high-frequency lighting device is used, but this illumination is not required and may be ordinary illumination. The illuminator 2 is arranged so that the light regularly reflected by the western foot 1 enters the television camera 3. The television camera 3 captures the specularly reflected light from the western foot 1. The video capture card 4 converts image data captured by the television camera 3 from analog data to digital data and stores it in a memory. By using this, image processing can be performed by a normal personal computer. The personal computer 5 reads out the image data from the video capture card 4 and examines the dents at the base of the vine or the flower fallen portion of the ridge 1 as a binary image to detect the hollow fruit.
[0014]
FIG. 2 is a cross-sectional view of a normal western ridge 1 without voids. Saijo 1 has a striped pattern from the base 11 at the top of the vine to the flower drop 12 at the bottom. Inside, usually seeds 14 are dispersed in red fruits 13. In the normal Nishimuro 1 without the void 15 inside, the base part 11 of the vine and the flower drop part 12 at the bottom are not dented. FIG. 3 is a cross-sectional view of the western wall 1 having a void. Saijo 1 with a void 15 in it has a vine root 11 and a flower drop 12 recessed.
[0015]
FIG. 4 shows an image of the base 11 of the normal vine vine without dents. The base portion 11 of the vine appears as an image that reflects light and shines almost circularly. The same applies to the flower falling part 12.
[0016]
FIG. 5 shows an image of the base 11 of the ridge of the west side with a dent. The root portion 11 of the vine reflects light around the dent, and the dent portion becomes dark and appears as a ring-shaped image 17. The same applies to the flower falling part 12.
[0017]
FIG. 6 shows a binary image of the images of FIGS. (A) is the binary image of FIG. 4, and uses a value that clearly distinguishes the central circle from the other as the threshold for binarization. (B) is the binary image of FIG. 5, and a value that clearly distinguishes the central ring from the others is used as the threshold for binarization.
[0018]
When the root part 11 or the flower drop part 12 of the vine 1 is circular as shown in FIG. 6 (A), the inside is determined to be a normal west part without voids. In the case of a ring as shown in FIG. 6B, when the maximum inner diameter of the ring is equal to or greater than a predetermined value, it is determined that the fruit is a hollow fruit (a state having a void).
[0019]
FIG. 7 is a diagram showing the relationship between the inner diameter of the ring and the size of the void. The horizontal axis indicates the sample number, and the vertical axis indicates the maximum length of the void in the unit mm. The inner diameter of the ring indicates the maximum inner diameter. As the maximum ring inner diameter increases, the maximum length of the void increases. Even in the samples 1 and 2 having no voids, a ring with a small inner diameter appears. In this embodiment, when the maximum ring inner diameter is 20 mm or more, it is determined as a hollow fruit. However, this value can be set appropriately.
[0020]
FIG. 8 is a diagram showing a process when there is a break in the ring. Due to the local shape change of the dent portion, there may be a case where a cut is formed instead of a ring as shown in (A). In this case, the hollow fruit is judged by either of the following.
(1) Judgment is made on the basis of the maximum ring inner diameter at a position where no break is formed.
{Circle around (2)} As shown in (B), thickening processing is performed until there is no break, and determination is made based on the corrected value of the decrease in the ring inner diameter caused by making it thicker than the maximum ring inner diameter at this time.
(3) A thickening process is performed as shown in (B), and a thinning process is performed as shown in (C), and a determination is made based on the maximum ring inner diameter in this state.
[0021]
【The invention's effect】
As is clear from the above explanation, the present invention investigated the relationship between the dent generated at the root of the vine or the flower drop of the west and the internal void, and found that this dent appeared as a ring-shaped image. From the inner diameter, it is possible to accurately determine the samurai with hollow fruits. In addition, because it has no effect on Saijo and it can be judged quickly, it is suitable for tests that determine the presence or absence of pores in a short time, such as Saitama's shipping inspection. .
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of an exemplary embodiment of the present invention.
FIG. 2 is a view showing the inside of a normal Saijo.
FIG. 3 is a view showing the inside of a western wall with a void.
FIG. 4 is an image of a normal vine root or flower drop.
FIG. 5 is an image of the root or flower drop part of a vine with a void.
6 is a binary image of FIGS. 4 and 5. FIG.
FIG. 7 is a diagram showing the relationship between the inner diameter of the ring at the base of the vine or the flower drop and the size of the void.
FIG. 8 is a diagram illustrating a determination process when a ring has a break.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Saijo 2 Illuminator 3 Television camera 4 Video capture card 5 Personal computer 11 The base part of a vine 12 Flower fall part 13 Fruit 14 Seed 15 Pot (cavity part)
16 Circular image 17 Ring-shaped image

Claims (4)

Illuminating the vine root or flower fall part of Saijo from above and capturing specularly reflected light, when an image that is lit in a circular shape is obtained, it is determined that the inside is not a hollow fruit, and the image that shines in a ring shape Cavity fruit judging method by appearance inspection of Saijo, characterized in that when obtained, it is judged as a hollow fruit fruit. An illuminating device that illuminates the vine root or flower fall part of Saijo from above ;
An imaging device for imaging specularly reflected light from the western foot illuminated by the lighting device;
An image processing device for generating a binary image from an image from the imaging device;
When the binary image shows a circle, it is determined that the inside is not a hollow fruit, and when a ring-shaped image appears, a determination device is provided that determines that the inside is a hollow fruit. Cavity fruit judging device by appearance inspection of Saijo characterized by. 3. The apparatus according to claim 2 , wherein the determination device measures the maximum inner diameter of the ring-shaped image and determines that the image is a hollow fruit when a predetermined reference value is exceeded. When the binary image is an image with a ring cut, the image processing device creates an image when the ring is formed by a fattening process, and the determination device determines the maximum of the ring-shaped image by the fattening process. the inner diameter is measured, when more than a predetermined reference, the cavity result determination device according to the visual inspection of the watermelon according to claim 2, wherein determining that a cavity results.

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