JP3325191B2 - Shellfish identification method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for distinguishing shellfish by shell length or shell height (size).

[0002]

2. Description of the Related Art Shellfish C must be discriminated according to size when ear-cultured or shipped. The maximum shell length A of the shellfish C is slightly different from 100mm to 180mm depending on the locality,
In any case, since the shell length A increases as the size of the shell C increases, the size of the shell C can be determined by measuring the shell length A. Therefore, conventionally, FIG.
As shown, the shell C has a light L from its front H or back J.
, And the resulting shadow D is captured by the camera E
, The image is processed by the processing device F, and the shell length A is measured from the number of pixels in the vicinity of the maximum length of the shell length A (the hatched portion in FIG. 4B) G. And the size (size) of the shellfish C was determined, and the shellfish C was sorted for each desired size.

[0003]

The above-described conventional shellfish discriminating method involves projecting light from the front surface or the back surface J of the shellfish C, and thus has the following problems. . If there is a missing shell portion I at the periphery of the shell, the area of the shadow D near the maximum length G of the shell length A decreases by that amount (FIG. 4).
(C)) When the image is captured as an image by the camera E, the number of pixels is reduced as compared with the case where there is no missing shell portion I. For example, in the case of a shell C having a shell length A of 125 mm, if there is no missing shell portion I, the number of pixels around the maximum length G of the shell length A is about 15500, but 1
The number of pixels is about 15,000 when there is a shell part I of about 3 mm.
When the shell length A is measured based on this, the shell length A is 120
mm to 122 mm, an error occurs from the actual shell length A, and the discrimination accuracy decreases. . The position of the maximum shell length of the shell C differs depending on the size of the shell C. That is, the maximum shell length of the large shell C is the small shell C
Is located above the maximum shell length. Therefore, in order to capture the shadow D with a fixed camera and measure the number of pixels near the maximum shell length of the shell C of various sizes, the measurement range must be set wide, and in such a case, the measurement speed and the measurement accuracy are increased. , The discrimination speed and the discrimination accuracy also decrease. . As shown in FIG. 4 (d), if the deposit K is attached to the vicinity G of the maximum length G of the shell C, the area of the shadow D increases by that amount, so that the maximum shell length A becomes smaller than that of the actual Measurement is performed for a longer time, and the discrimination accuracy is reduced.

An object of the present invention is to provide a shellfish discriminating method capable of accurately discriminating a shellfish even if there is a missing shell portion.

[0005]

According to a first aspect of the present invention, a method for determining a shellfish according to the first aspect of the present invention is to project light from one side of a shell height direction of a shellfish 1 as shown in FIG. The image is captured as an image by the camera 3 arranged in the other direction, and the shell length A is measured from the number of pixels near the maximum shell length A in the image to determine the size of the shell 1.

According to a second aspect of the present invention, there is provided a method for determining a shellfish,
As shown in FIG. 2, light is projected from one side of the shell length direction of the shell 1, and the shadow 2 of the shell 1 is captured as an image by the camera 3 arranged on the other side in the shell length direction. The size of the shell 1 is determined by measuring the shell height B from the number of pixels.

[0007]

[First Embodiment] An example of an embodiment of a shellfish discriminating method according to the present invention will be described in detail with reference to FIG. . The light 8 projects light from below the connecting portion 6 of the shell 1 which is clamped by the holder 4 in a vertically standing state and conveyed on a carrier (for example, a roller conveyor or a chain conveyor) 5 toward the cutting edge 7. I do. . The shadow 2 generated by the light projection is captured as an image by the camera 3 arranged at a position facing the light 8. . In the image, the processing device 9 measures the number of pixels in the range of 5 mm to 7 mm on both sides of the seam of the shell 1 (the hatched portion in FIG. 1B), which is the maximum width portion of the shell length A. . The shell length A (FIG. 1B) is calculated from the measured number of pixels, and the size of the shell 1 is determined based on this. . The shellfish 1 is sorted out for each determined size.

The shell 1 is held by being held between openable and closable holding members 4 or by automatically opening and closing the holding members 4. At this time, the connecting portion 6 is held vertically upright. The light 8 is arranged below the carrier 5 so that when the conveyed shell 1 comes above the light 8, light is projected from the connecting portion 6 side of the shell 1 toward the cutting edge 7. . By this light projection, an elongated shadow 2 having the maximum shell length A of the shell 1 as a length is generated as shown in FIG.

The camera 5 is disposed at a position facing the light 8 with the shell 1 interposed therebetween, and captures a shadow 2 generated by the projection of light as an image. As the camera 5, a normal TV camera having about 240,000 pixels is used. The image captured by the camera 5 is processed by the processing device 9 and only the number of pixels in the range of 5 mm to 7 mm on both sides of the joint of the shell 1 which is the maximum shell length of the shell 1 is measured. The measurement range is set in advance, but if it is set too wide, the measurement speed and the measurement accuracy decrease, and the discrimination speed and the discrimination accuracy decrease accordingly. Therefore, it is desirable to make the measurement range as narrow as possible.

The processing apparatus 9 has a shell 1 to be determined in advance.
The shell length A and the number of pixels in the measurement range corresponding to the shell length A are input as data for each size, and the measured number of pixels is compared with the number of pixels input as data. Is calculated, and the shell length 1 is calculated from the shell length A.
Determine the size of

The light may be projected from the direction of the cutting edge 7 of the shell 1 toward the connecting portion 6. In this case, the cutting edge 7 of the shell 1
Is held vertically, and light is projected from below the cutting edge 7 toward the connecting portion 6 by the light 8 or the holding state of the shell 1 is the same as that shown in FIG. Light 8
And the position of the camera 5 is reversed.

[0012]

Second Embodiment Another example of the embodiment of the shellfish discriminating method of the present invention will be described in detail with reference to FIG. The basic configuration of the shellfish determination method shown in FIG. 2 is the same as that shown in FIG. The difference is that the shell length A is measured by projecting light from below the connecting portion 6 of the shell 1 toward the cutting edge 7 in the shellfish determination method shown in FIG. 1, whereas the shell shell determination shown in FIG. The method is to measure the shell height B by projecting light from one side of the shell length direction of the shell 1 (right side of the figure) and capturing the resulting shadow 2 by the camera 5 arranged on the other side of the shell length direction (left side of the figure). is there. Although the shell height B also differs somewhat depending on the place of origin, similarly to the shell length A, the shell height B increases as the shell 1 becomes larger. Therefore, the size of the shell 1 can also be determined by measuring the shell height B.

[0013]

The present invention has the following effects. . When light is projected from the front or back of shell 1, shell 1
Even if there is no shell portion in the maximum shell length of the shell, if there is a shell portion around the shell portion, the shadow 2 generated will be smaller by that amount, but if light is projected from the shell length direction or shell height direction of the shell 1, The size of the shadow 2 changes as long as there is no missing shell at the maximum shell length or the maximum shell height of 1; therefore, there is almost no influence of the missing shell and no discrimination error occurs. . If the maximum width portion of the shell length A is captured from the surface or the back of the shell 1, its position changes depending on the size of the shell 1, so the number of pixels of the maximum width portion of the shell length A must be set unless the measurement range is set wide. It cannot be measured, but if it is viewed from the shell length direction or shell height direction of the shell 1, its position does not change depending on the size of the shell 1, so the pixel of the maximum width portion of the shell length A without setting a wide measurement range. The number can be measured. Therefore, the measuring speed and the measuring accuracy are increased by the narrower measuring range, and accordingly, the determining speed and the determining accuracy are also increased. . Even if the attached matter is attached to the peripheral portion of the shell 1, it is hardly affected by the attached matter, so that the determination accuracy is high.

[Brief description of the drawings]

FIG. 1 (a) is an explanatory view showing a first embodiment of a shellfish discrimination method of the present invention, and FIG. 1 (b) shows a state of a shadow 2 when light is projected from a connecting portion 6 direction of the shell 1; FIG.

FIG. 2A is an explanatory view showing a second embodiment of the shellfish discriminating method of the present invention, and FIG. 2B is an explanatory view showing a state of a shadow 2 when light is projected from a shell length direction of the shell 1; FIG.

FIG. 3A is a side view showing a transport state of the shell 1, and FIG.
FIG. 2 is a plan view showing a transport state of the shell 1.

FIG. 4 (a) is an explanatory diagram showing a light projection state in a conventional shellfish discriminating method, FIG. 4 (b) is an explanatory diagram showing a measurement range in a conventional shellfish discriminating method, and FIG. FIG. 3D is an explanatory diagram showing a measurement range when a part is present, and FIG. 4D is an explanatory diagram showing a measurement range when an extraneous substance is attached to a shellfish.

[Explanation of symbols]

 1 shellfish 2 shadow 3 camera A shell length B shell height

──────────────────────────────────────────────────続 き Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G01B 11/00-11/30 102 B07C 1/00-9/00

Claims (2)

(57) [Claims] 1. Light is projected from one side of a shell height direction of a shell (1),
The shadow (2) of the shell (1) is captured as an image by the camera (3) arranged on the other side in the shell height direction, and the shell length in the image (A)
A shell length (A) is measured from the number of pixels near the maximum length to determine the size of the shell (1). 2. A light is projected from one side of the shell length direction of the shell (1),
The shadow (2) of the shell (1) is captured as an image by the camera (3) arranged on the other side in the shell length direction, and the shell height (B) in the image is captured.
A shell height (B) is measured from the number of pixels near the maximum width of the shell to determine the size of the shell (1).