Marker method is a model that can be used as a counter of a passing object through video processing. Actually, this method has a good performance, but the performance will decrease if there is imperfect binary image. Because of this Marker method’s weakness, we propose another algorithm in this paper which is called as Catcher method. This method has gray box effect which can make currentobject always 1 so the impact of imperfect binary image will not come. And the object is calculated when currentobject changes from 0 to 1.

catcher method, algorithm, count a passing object, video signal processing.