This paper presents a method for motion detection from image sequences with a moving camera. The most important problem is how to cancel the motion of backgrounds caused by the motion of camera. Existing methods can be divided into two groups. First group is using information about the motion of camera. Second group is using only image sequences. First group can be used only in restricted environment. Second group is free from environmental condition. But calculated accuracy of this method is not so high, and complex preprocessing is necessary for the detection of moving objects. In this paper, we proposed a method which can detect a moving object by using precise geometric transformation for background. Experimental results showed the effectiveness of this method.