In order to research the specific applications of a CMOS image sensor with a rolling shutter,this paper researches the specific CMOS image sensor.Firstly, the principle and characteristics of the global shutter and rolling shutter of the CMOS imager are introduced,and the impact of the rolling shutter on measurement precision of the imaging system is analyzed.An imaging experiment is taken to analyze the rolling shutter.Then,a new method for computing instantaneously 3D poses and velocities of fast moving objects is presented by using a single view.Finally,a general perspective projection model of a moving 3D point is presented,and a method to estimate the pose and velocity is discussed.Experimental results indicate that distortion appears when moving objects are imaged by the CMOS imager,and the degree of distortion has close relations with some parameters of CMOS imager such as integration.Moreover,the post and velocity parameters of a motion object can be obtained which shows in the case of minimizing errors. The calculation error is under 2.5% and the measurement accuracy is 0.01 rad/s.After analysis,the experimental results have proved that not only the approach is practicable but also it can transform a low cost and low power CMOS camera into a new velocity sensor.