PURPOSE: To quantitatively measure the ecology of fishes without landing them by illuminating fishes only at the time of measurement to pick up the image of fishes with an underwater camera and performing the image recognition of results by pattern matching.
CONSTITUTION: In a breeding pond 10 of a fishes 11, the voltage of an illuminating light scattering plate 13 is released by the timing of a timer 21 of an image processing device 20 to make this plate 13 opaque, and the illuminating light is uniformized. Simultaneously, the image picked up by an underwater camera 15 is converted to a digital image by an A/D converter 22 and is binarized by a binarizing processing circuit 24. A template 25 is used to perform pattern matching of the binary image in a pattern matching circuit 26. When the image is judged to be correct, feature quantities such as the surface area and the peripheral length of the fish are quantitatively analyzed in accordance with the binary image and results are outputted to an F/D 40 or a typewriter 50.
KATORI TAKASHI
YODA MIKIO
HARA NAOKI
HITACHI ENG CO LTD