Counting method of fry using a line image sensor.

Abstract

In the recent field of the fishery, the improvement of the efficiency, automation and labor deduction are needed. A counting task in this field is very important in many cases. In this paper, we present a system which enables a real-time measurement of the number and also the body length of the fry using a line image sensor. Here, we consider a situation that fry are transported from one pond to another pond through a pipe. In our system at one position of the pipe a transparent rectangular channel is mounted. The images of the fry, which run through this rectangular channel, are detected with a line image sensor. The image signals are digitized to binary ones and the contour of the fry are detected. After that, a real-time image analysis is executed with DSP (Digital Signal Processor). Overlapping of two fry images is also analysed. Whenever the fry pass the rectanglar channel, the DSP gives us the number and projection area surrounding length of fry images.