METHOD AND APPARATUS FOR COUNTING MOBILE OBJECTS

摘要

A fish counting method for counting the number of fish by emitting an ultrasonic wave or an electromagnetic wave to a predetermined area where fish pass in a fish farming pool, a river, or the like and receiving reflected waves from fish bodies, wherein, the reflected waves received from a cross section of the predetermined area are periodically stored and an ultrasonic wave fish shade image that shows changes of fish shades is produced, and fish are counted by carrying out an image processing for discriminating the ultrasonic wave fish shade image based on a predetermined fish shade decision rule. With this arrangement, errors due to muddiness and dusts in water can be reduced and an automatic continuous measuring for a long term can be achieved.