JPH0844843A - Analyzer for fish flow in fishway - Google Patents

Abstract

PURPOSE:To obtain the number of fish passing a fixed line of a fishway by preparing timewise continuous images by lining up image data showing the passage of time for every line photographed by a line camera in the order of photographing, and measuring the number of moving objects to appear in this continuous image. CONSTITUTION:A line sensor built in a line camera 1 passes the image data of an analog amount corresponding to its image through as A/D converter 2, respectively records the prescribed amount of image data in an image memory 3 for each line as digital data and records them in a digital recorder as the digital data. These recorded image data are transferred to an image processing part 8, and a continuous image B is prepared by arranging these transferred image data for every line in the order of photographing. The standard pattern of a moving object A is extracted from this continuous image B, these extracted data are compared with the standard pattern stored in the image processing part 8 and when the moving object A is decided as fish, its number is measured so that the number of fish on the straight line of the fishway can be totalized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for automatically measuring the number of fish passing through a fishway.

[0002]

2. Description of the Related Art Conventionally, the number of fish passing through a fishway has been visually counted by placing a person at a measuring point. However, it is difficult to manually perform this accurately for a long time.

Therefore, a method of analyzing the image taken by using a video camera and measuring the number of fish passing through the fishway has been tried.

[0004]

However, since the image of the video camera is an intermittent image every 30th of a second, when measuring the number of fish, the images before and after are always compared to determine the solid image. You need to be aware of movement.

Further, since the video camera takes a picture of the surface, when the water surface is reflected like a fishway, it is necessary to take a measure such as covering the whole picture surface with something wide or using box glasses.

In view of these points, the present invention described above occurs when shooting with a video camera by analyzing and measuring the number of fish passing through the fishway using an image taken with a line camera. The purpose is to solve the problem.

[0007]

In order to achieve the above object, the present invention has the following constitution.

That is, a line camera for photographing the image data on a fixed line of the fishway for each line at a regular time interval and reading it into a memory, and the image data photographed by the line camera for a fixed time for each line. Continuous image creating means for arranging in sequence to create a continuous image for a fixed time, and movement for extracting an image of a moving body that has passed on the shooting line during a fixed time from the continuous image for the fixed time created by the continuous image creating means Body extracting means, determining means for determining whether or not the moving body extracted by the moving body extracting means is a fish, and counting the number of fish present in a continuous image for a certain time from the result of the determination for a certain time. And a fish number measuring means for counting the number of fish that have passed along a fixed line of the fishway, and a fish flow analysis device in the fishway.

[0009]

The line camera is installed on the fishway, and image data on a fixed line of the fishway is photographed at regular time intervals line by line and read into the memory.

The continuous image forming means arranges the image data, in which one line taken by the line camera shows a regular passage of time, in the shooting order every line for a fixed time to create a continuous image for a fixed time.

The moving body extracting means extracts the image of the moving body which has passed on the photographing line during the fixed time from the continuous image for the fixed time created by the continuous image creating means.

The determining means determines whether or not the moving body extracted by the moving body extracting means is a fish. The measuring means counts the number of fish existing in the continuous image for a certain time from the determination result, thereby measuring the number of fish that have passed along a certain line of the fishway during the certain time.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention. 1 to 6 of FIG. 1 show a recording unit for recording an image on a fixed line of the fishway, and 7 and 8 of FIG. 1 show an analyzing unit for analyzing the recorded image data.

In the figure, reference numeral 1 denotes a line camera, which is an apparatus for continuously taking a one-dimensional image. As the photoelectric conversion element of the line camera 1, a line sensor which is a signal transfer type image sensor in which light receiving elements such as CCDs are arranged in a straight line is used. The density color information on a fixed line of the fishway read by the line camera 1 is 1-dimensional image
It is output in time series for each line.

An image memory 3 is capable of recording a certain amount of image data. The density color information output from the line camera 1 is sent to the image memory 3 via the A / D converter 2.
Recorded in.

Reference numeral 5 denotes a digital recorder, which is an image memory 3
When the amount of the image data recorded in (1) reaches a predetermined amount, the image data is recorded as digital data. A display unit 4 displays the image data in the image memory 3. A controller 6 controls the line camera 1, the A / D converter 2, and the image memory 3 in a predetermined procedure.

Reference numeral 7 denotes an image processing unit, which is composed of a computer or the like, takes in the image data recorded in the digital recording device 5, and performs image analysis processing. The image processing unit 7
A standard pattern serving as a reference necessary for determining whether or not the moving body A passing through the fishway is a fish is stored in advance. A display unit 8 displays a continuous image of the fishway taken by the line camera 1 together with the measurement result.

Next, an example of the image processing of the embodiment thus constructed will be described with reference to the flowchart of FIG. As shown in FIG. 2, the line camera 1 is installed on the fishway so as to photograph a fixed line of the fishway from directly above.
Moreover, the number of times of photographing is about 30 to 50 times per second. Only the line camera 1 needs to be installed on the fishway, but other devices can be installed in a place away from the camera (even a distance of several hundred meters is possible). The most important thing to be aware of when shooting is the installation location of the line camera 1. The shooting range of the line camera 1 is a width of the fishway in the horizontal direction (right angle to the direction of the fishway) and a range of several mm to 1 cm (depending on the width of the fishway and required accuracy) in the vertical direction (flow direction of the fishway). In this photographing range, in order to suppress unnecessary reflection as much as possible, it is preferable to mount it on a support tool having a width of about 20 cm. The weight of the line camera 1 is 2
Since it is relatively light weight of less than kg, it can be installed by considering only the strength of the support itself for mounting. If there is a bridge on the fishway, it may be possible to install the line camera 1 under the girder of the bridge, depending on the height of the bridge. Although the installation height of the camera 1 varies depending on the fishway width, surrounding conditions, etc., an appropriate height is naturally determined by determining the focal length of the lens to be used.

First, at the time of recording, the line camera 1 captures an image for one line. (S1) The line sensor built in the line camera 1 outputs image data of an analog amount corresponding to the image in time series. The output image data is stored in the image memory 3 line by line as digital data through the A / D converter 2. When a predetermined amount of image data is stored in the image memory 3, the image data is recorded in the digital recorder 5 as digital data.

Next, at the time of analysis, the image data recorded in the digital recorder 5 is transferred to the image processing section 7. The image processing unit 7 arranges the transferred image data for each line in the order of photographing to create a continuous image B as shown in FIG.
(S2) When creating the continuous image B, the image data of one line before is subtracted for each line and only the difference from the image of one line before is displayed. Therefore, the continuous image B
, Only the part of the difference from the image one line before, that is, the data relating to the moving body is extracted, and the data relating to the part where there is no change such as the background is erased. (S3)

The image processing unit 7 extracts from the continuous image B detection data corresponding to a standard pattern (a standard pattern for discriminating whether the moving body is a fish or a fish) that is known in advance for the moving body A. Then, by comparing the extracted detection data with the standard pattern stored in the image processing unit 7, it is determined whether or not the moving body A is a fish based on the degree of similarity with the standard pattern. (S4)

When it is determined that the moving body A is a fish,
The number of fish is counted by setting it to 1. (S5) In this way, the number of fish is counted for all the moving bodies A in the continuous image B while determining whether or not they are fish, and the results are totaled. (S6) This tabulation result is
It is output to the display device 8 together with information such as time. (S
7)

As described above, in this embodiment, the continuous image B is created by arranging the one-dimensional images (image data for each line) taken by the line camera 1 in the order of shooting, and the moving body A is based on this continuous image B. Get information about.

In the present embodiment, since the line sensor of the signal transfer system is used as the image sensor of the line camera 1, there is an advantage that the resolution is high and the detected image data is output in time series. There is an advantage that a processing step of rearranging data is not required and recording and analysis can be speeded up.

[0026]

As described above, according to the present invention, the image data showing the passage of time for each line taken by the line camera is arranged in the order of shooting to create a temporally continuous image, and the movement that appears in the continuous image is displayed. By measuring the number of bodies, the number of fish passing along a fixed line of the fishway is obtained. Therefore, in the case of measuring the number of fish using a video camera, it is necessary to always recognize the moving object while comparing the front and back of intermittent images. Then, it is possible to count the number. Further, since the video camera shoots a surface, it is necessary to take measures such as widely covering the entire shooting surface with something or using box glasses when the object has reflection such as a water surface. Since the shooting surface is very narrow, there is an effect that such measures are unnecessary.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is a front view showing a shooting range of the line camera in the embodiment of the present invention.

FIG. 3 is a plan view showing an installation state of the line camera in the embodiment of the present invention.

FIG. 4 is a flowchart showing a procedure of analysis according to the embodiment of the present invention.

FIG. 5 is a diagram showing continuous images and image data regarding a moving object according to the embodiment of the present invention.

[Explanation of symbols]

 1 Line Camera 2 A / D Converter 3 Image Memory 4 Display 5 Digital Recorder 6 Controller 7 Image Processor 8 Display

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ichiro Matsuo 4-9-11 Nihonbashi Honcho, Chuo-ku, Tokyo Inside the Research Institute of Construction Technology (72) Inventor Yoshitaka Matsumoto 3-4-15 Mita, Minato-ku, Tokyo −903 In stock company core (72) Inventor Osamu Murakami 3-4-15-903 Mita, Minato-ku, Tokyo In stock company core

Claims (1)

[Claims] 1. A line camera that captures image data on a fixed line of a fishway for each line at regular time intervals and reads it into a memory; and image data captured by the line camera for a fixed period of time.
Continuous image creating means for arranging line by line in order of shooting to create a continuous image for a fixed time, and an image of a moving object that has passed on the shooting line for a fixed time from the continuous image for a fixed time created by the continuous image creating means A moving body extracting means for extracting the moving body extracting means, a determining means for determining whether or not the moving body extracted by the moving body extracting means is a fish, and counting the number of fish existing in a continuous image for a certain time from the determination result. An apparatus for analyzing fish flow in a fishway, comprising: a fish count measuring means for counting the number of fish that have passed along a fixed line of the fishway during a fixed time.