| 摘要 |
<p>A fish population counting device for counting the number of fish passing through the fish pass according to directions and fish sizes. Image data produced by the two-line camera (1) that takes pictures simultaneously on two shooting lines (A, B) is sent through the A/D converter (2) and stored one line at a time in image memories (3A, 3B). The image data is then transferred to the processing unit (6), where they are rearranged in the order of shooting for each shooting line (A, B) to generate two-line successive images (A, B). From these two-line successive images (A, B), the outlines of the areas whose label numbers are the same are traced to separate massive figures scattered in the images. The features of the massive figures are extracted and matched against a standard pattern to decide if the massive figures are fish or not. Then, the positions and shapes of all fish scattered in the two-line successive images (A, B) are identified one by one to count the number of fish that have passed through the shooting lines (A, B) during a predetermined length of time. Further, individual fish that are at displaceable positions are taken to be the same fish and, based on the displacements of these fish, the directions and speeds of these individual fish are calculated. From the fish speeds the size of each fish is determined. The number of fish is counted by the size and the direction.</p> |
