JPS6159437A - Photographic base - Google Patents

Abstract

PURPOSE:To increase the contrast between an image of a fish body and its background and to hole the background at a uniform density level by forming the bottom surface of the photographic base in the shape of a U groove, and providing a specific-height reflecting surface to its flank. CONSTITUTION:The photographic base consists of a photographic base body 2, two reflecting surfaces 1, and a stopper 3 for fitting the photographic base body 2 and reflecting surfaces, and the main body 2 consists of a bottom surface 201 and a side plate 2-2. The bottom surface 2-1 is uniform in its lengthwise direction and the cross section line forms an arc which is downward convex at right angles of the lengthwise direction, and an opaque acryl plate which has a high light reflection factor is fitted as a reflecting surface 1 to the flank 2-2 of the photographic base body 2 by using the stopper 3. The height of the reflecting surface 1 is so set that no influence of an adjacent light source is exerted.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a photographing stand for photographing fish images, etc., and in particular, the present invention relates to a photographing stand for photographing fish body images, etc., and in particular, the present invention relates to a photographing stand for photographing fish body images, etc. The present invention relates to a photographing stand capable of obtaining an image.

[Conventional technology]

For example, when feeding freshly caught fish into a machine that produces minced fish such as walleye, it is necessary to align the fish in the correct direction. For this purpose, it is necessary to identify the direction of the fish, but conventionally this has been done manually or by mechanical contact detection means. When done manually, humans are forced to undergo very simple and painful labor. When done mechanically, the disadvantage is that the amount of equipment required is particularly large. It goes without saying that it would be desirable for Class W to be smaller.

For this reason, regarding a device for processing input fish, Japanese Patent Application No. 57-229480. Patent application 1974-]04745,
Japanese patent application No. 57-167380 has been proposed.

[Problem that the invention seeks to solve]

Although the present invention is not limited thereto, for example, in image processing of a fish body image, it is necessary to extract the contour line of the fish body image from the photographed image and to correctly extract only the fish body image. For this purpose, the photographed image must satisfy the following five conditions.

■ The fish body image is completely included in the photographed image.

■ The photographed image does not contain any extra images other than the fish image.

■ High contrast between the fish image and the background. (To extract the contour line correctly.) ■ There is no shadow in the fish image. (If shadows appear, correct boundaries cannot be obtained.) ■ The shading level of the background area is uniform. (If they are not uniform, the difference in level will appear as unnecessary edges.) FIG. 2 is a diagram showing examples of photographed images suitable and unsuitable for extracting fish body images. In the figure, ○ is a suitable image.

× is inappropriate (elephant).

That is, FIG. 2 (2) is an example of a suitable image, in which only a fish image with contrast with the background is completely included in the photographed image.

On the other hand, in Fig. 2 ■, the fish body image is missing in the photographed image, and Fig. 2 ■
includes images other than the fish image, and in Figure 2 ■, the contrast between the fish image and the background is such that a shadow of the fish image appears, and in Figure 2 ■, the density level of the background area is not uniform, both of which are inappropriate. This is an example of a statue.

A photographed image including a fish body image is obtained by the following procedure.

(b) Send the fish body to the photographing stand.

(Mouth) Shine a light on the fish on the shooting stand.

(c) Photograph the fish using a photographic device such as a TV camera.

Thereafter, the photographed image is recorded in a recording device such as an image memory.

The usage environment of the imaging stand in (a) to (c) above is as follows.

(al) The camera stand is installed in a place where there is turbulence, especially inside a ship.

(b) A camera and strobe light source are installed directly above the center of the bottom, with the camera located higher.

(The field of view of the Cl camera is narrower than the width of the bottom and wider than the width of the fish body, centered on the center of the bottom.

(d+ Fish bodies are fed into the photographing platform one by one from a certain direction, but the directional vector is not necessarily constant.

(el photographing stand. A set of cameras and strobe light sources are installed in parallel at a certain interval.

Figure 3 is a diagram showing the usage environment of the imaging stand.
a) is a plan view, FIG. 3(b) is a side view, and d is the distance between the photographing stands. In Fig. 3 (a), the direction vector in which the fish is sent is not constant, and in Fig. 3 (1)), although the relative relationships among the photographing platform, camera, and strobe light source remain unchanged, the overall situation is swaying. It's at the source.

Next, under such a usage environment, a photographing stand for obtaining a photographed image satisfying the conditions (1) to (4) described above will be considered.

Conventionally, the following devices have been considered as fish photography stands, but each had the following drawbacks.

(A) The bottom surface is flat and there are no side plates on both sides (as shown in Figure 4)) If the direction in which the fish is fed is not constant, the fish may deviate from the center line in the longitudinal direction, or the photographing platform may shake. If the fish moves out of the field of view of the camera or jumps out of the photographing platform, it is impossible to obtain an image of the fish suitable for image processing. (
(corresponding to that in Fig. 2) In Fig. 4, f8) is a plan view. (
b) is a sectional view of the bottom surface.

(B) A device with a flat bottom and side plates on both sides 1) When the field of view is narrower than the size of the bottom (as shown in Figure 5) The fish will not jump out from the photographing platform, but there is a possibility that it will be out of the field of view. (Corresponding to Figure 2 ■) In Figure 5, (al
is a plan view, and (b) is a sectional view of the bottom surface.

ii) When the field of view is wider than the size of the bottom (as shown in Figure 6) The fish is within the field of view, but the bottom and side beams are not included in the photographed image (al is a plan view, (b) is a cross-sectional view of the bottom) It is.

(C) A type with a 7-shaped bottom (as shown in Figure 7).The fish body is centered and falls within the field of view, but the bending line on the bottom is included in the photographed image as an unnecessary line. (Same properties as in FIG. 2 ■) In FIG. 7, +al is a plan view, and (b) is a sectional view of the bottom surface.

(D) Photographing tables without reflective surfaces on both sides Independently of the shape of the bottom of the photographing tables (A) to (C), photographing tables without reflective surfaces on the side surfaces have the following drawbacks.

1) Since there is light escaping to the outside of the photographing stand, the illuminance within the field of view does not increase, resulting in a photographed image with low contrast, and the boundaries of the fish body becoming unclear. (Corresponds to Figure 2 ■) 2) Since there is no reflected light, the shadow of the fish enters the photographed image, making the boundaries of the fish unclear. (See figure 2 ■).

For details, see Figure 12 below) FIG. 8 is a diagram showing an example of a photographing stand without a reflective surface.

3) If there is no reflective surface on the side, the strobe irradiation light from the adjacent photographing stand will directly hit a part of the field of view, and only that area will become bright, resulting in a difference in density level in the background of the photographed image. (Corresponds to Fig. 2 ■, see Fig. 9) In Fig. 9, (al is a cross-sectional view, and (b) is a photographed image. As shown in Fig. 9 (a), in the area A of the visual field As a result of being hit by neighboring light, the area toward the background becomes a brighter density level, as shown in the same figure (bl).

[Failure to solve the problem]

The purpose of the present invention is to facilitate image processing of fish bodies, etc.
The fish body, etc. is closer to the center of the bottom surface, edge lines, shadows, etc. other than the image of the fish body, etc. are not captured in the photographed image, and the contrast between the image of the fish body, etc. and the background is high, and the background has a uniform density level. Our goal is to provide such a photography stand.

For this purpose, the light source and photographic means are provided on the top.
A photographing stand for photographing an image of a subject placed thereon, the bottom surface of which is smooth in the longitudinal direction, and whose cross-sectional line has a unique minimum point in a direction perpendicular to the longitudinal direction;
This is achieved by a photographing stand that is differentiable at points other than both end points, and is further configured with a reflective surface of a constant height on the side surface.

[For production]

The present invention has a U-shaped groove (to express it mathematically, it is smooth in the longitudinal direction, and its cross-sectional line has a unique minimum point and both end points in the longitudinal direction). By making the bottom surface shape differentiable at all points except for the bottom surface and providing reflective surfaces of a certain height on the sides, it is possible to obtain photographed images suitable for image processing of fish bodies, etc.

(1) Shape of the bottom surface of the photographing stand A U-shaped groove is adopted as the bottom surface shape of the photographing stand which simultaneously satisfies the above-mentioned conditions (1) and (2).

By adopting such a shape, the following features arise.

■) Ensure that the fish body is centered on the bottom.

Even if the fish body tries to move out of the field of view due to force exerted outward from the center of the bottom surface due to shaking of the photographing platform, etc., the fish body always approaches the center of the bottom surface because a centripetal force acts toward the center of the bottom surface. Therefore, when the center of the field of view of the camera and the center of the bottom surface coincide, the fish image will be included in the photographed image. (See FIG. 10) In FIG. 10, (al is an external view, and (b) is a sectional view.

2) Since the shape is smooth, unnecessary edge lines etc. are not included in image processing.

Therefore, by making the bottom surface a U-shaped groove,
The two conditions (2) can be satisfied at the same time.

(IT) To install reflective surfaces, install reflective surfaces on both sides of the photographing stand. The reflective surface is opaque and has a high light reflectance. Height of reflective surface 3)
Set it to the height described in .

By providing a reflective surface, the following features arise.

1) Illumination efficiency can be increased by directing light into the photographing table by utilizing light reflection without letting the irradiated light escape to the outside. (
(See Figure 11) In Figure 11, (al is an external view, and (b) is a cross-sectional view. In the figure, light A escapes to the outside of the photographing stand when there is no reflective surface, but when a reflective surface is installed) It is reflected inward by Kokichi and added to direct light B, increasing the illuminance.

2) The shadow of the fish body can be removed due to the wraparound effect of reflected light. (See FIG. 12) It is a figure.

At +8+, when the light source is lower than the camera, there is a portion (background region C) in the field of view that is not illuminated and appears as a shadow of the fish body in the photographed image.

Therefore, a clear boundary line between the fish bodies cannot be obtained.

(Corresponding to Figure 2 (2)) On the other hand, in fbl, the light reflected by the reflective surface also goes around to area C, so the shadow of the fish body does not sometimes appear in the photographed image.

3) By setting the height of the reflective surface as shown below, the background level of the photographed image can be made uniform without being affected by adjacent illumination light.

FIG. 13 is an explanatory diagram for determining the height of a reflecting surface to avoid interference between adjacent light sources, and in the figure, d is the distance between the centers of the photographing tables.

a is the width of the shooting platform.

b is the distance between the light source and the top of the bottom surface.

W is the width of the field of view.

h is the distance from the bottom edge to the height of the field of view.

1 (is the height of the reflective surface.

In Fig. 13, when the bottom shape is symmetrical about the center line of the bottom, in the diagonally shaded triangle, (b-1-h): (
H-1-h)= (d+w/2): (a/2+w/
2) holds true.

therefore, When the following conditions are met, neighboring lights do not directly enter the field of view.

If the height of the reflective surface is made higher than necessary, the photographing platform will become large and it will be inconvenient to handle, so the height of the reflective surface is preferably set to I] in equation (1).

〔Example〕

FIG. 1 is a diagram showing an embodiment of the present invention. Figure 1 (a
) is an external view, and FIG.

The photographing table in this embodiment is composed of a photographing table main body 2, two reflective surfaces 1, and a stopper 3 for attaching the photographing table main body 2 and the reflective surfaces 1. Furthermore, the main body 2 has a bottom surface 2-1 and a side plate 2-2. consists of parts.

The bottom surface 2-1 is uniform in the longitudinal direction, and the cross-sectional line is a downwardly convex arc in the direction perpendicular to the longitudinal direction. An opaque acrylic plate with high light reflectivity is attached as the reflective surface 1 using a fastener 3. The height of the reflective surface 1 satisfies the above-mentioned formula (1), so that it is not affected by adjacent light sources.

The imaging stand in this embodiment has the following features.

[1] Since the cross section of the bottom surface 2-1 is a downwardly convex circular arc, it does not jump out of the field of view even if the fish body is displaced or the photographing platform is tilted. (See Figure 14 (al, (bl)) Figure 14+
At al, depending on the direction in which the fish is being fed, a force is exerted on the fish that tries to move it out, but since the bottom surface is an arc, it is pulled toward the center.

Furthermore, in FIG. 14(b), even if the photographing platform is tilted somewhat due to the rocking of the ship, it will not go out of the field of view because the bottom surface is an arc.

[2] Since the bottom surface is smooth, unnecessary images other than the fish body image are not captured in the field of view.

[3] Since the reflective surface is attached, the lighting efficiency is increased, the contrast between the fish image and the background is increased, and the shadow of the fish can be removed. (See FIGS. 11 and 12) [4] Since the height of the reflective surface satisfies the above equation (1), it is not photographed by the illumination light from the adjacent photographing stand. (See Fig. 13) In the photographing stand in this embodiment, the above []] to [4]
] Because of these functions and features, it is possible to obtain captured images suitable for image processing of fish bodies.

〔Effect of the invention〕

According to the present invention, the fish body is moved to the center of the photographing platform, unnecessary lines are not captured, lighting efficiency is improved, shadows of the fish body can be removed, and the image of the fish body is not affected by neighboring illumination light. This has the effect that a captured image suitable for processing can be obtained. Although the above description deals with fish bodies, it is clear that the present invention is not limited to fish bodies and can be applied to other subjects.

[Brief explanation of drawings]

FIG. 1 is a diagram showing one embodiment of the present invention, FIG. 2 is a diagram showing an example of a photographed image that leads to the extraction of a fish body image, and an example of an unsuitable photographed image.
The figure shows the environment in which the photographing stand is used. 4 to 9 are diagrams showing a conventional photographing table, and FIG. 10 is a diagram showing a photographing table having a U-shaped groove on the bottom and its effects. Figures 11 and 12 are diagrams showing the photographing stand with a reflective surface attached and its effects, Figure 13 is a diagram showing the height of the reflective surface to avoid interference with adjacent light sources, and Figure 14 is an example. It is a figure which shows the effect of the imaging stand in . ■ Figure 2 [4th # system 3rd flash Cb] Cod a diagram ((L) (b) Figure 9 IO diagram

Claims (3)

[Claims] (1) A photographing stand with a light source and a photographing means provided on its upper part and for photographing an image of a placed subject, the bottom surface of which is smooth with respect to the longitudinal direction, and whose bottom surface is perpendicular to the longitudinal direction. A photographing stand characterized in that a cross-sectional line has a unique minimum point, is differentiable at points other than both end points, and is further configured with a reflecting surface of a constant height on the side surface. (2) When a plurality of the photographing stands are installed in parallel, the distance between the centers of the adjacent photographing stands is d, the width of the photographing stands is a,
The vertical distance between the light source and the top of the bottom of the imaging table is b, and the horizontal width of the field of view of the imaging means with respect to the bottom of the imaging table is w.
, where h is the vertical distance from the upper end of the bottom of the imaging platform to the upper limit position of the field of view within the bottom of the imaging platform, the height H of the reflecting surface is H≧[(a+w)(b+h)]/( 2d+w)-h
Photography stand mentioned in ). (3) The photographing stand according to claim (1) or (2), wherein the subject is a fish.