Abstract
Pigeons have causing lot of problems. As one of the solution of these bird problems, we have carried out to search for the birds by using the robot which is installed the camera. The camera is in outside environment, so the input image is so changeable by time and seine change. To adapt outside environmet, we have seeked the pigeons using the model of environmental form and the method of frame subtraction. We use Hough transform to search for the model of environment. And to adapt the seine change, we have used the method of interpolating background using frame subtraction.