Abstract: A gun slaving speed measuring method based on image perspective distortion correction is proposed to solve the complicated operation and low measurement accuracy of traditional measuring method. In the proposed measuring method, a gun slaving speed measuring system composed of laser, target plate, CCD camera and computer is established. The CCD camera is responsible for real-time recording of positions of laser spot on the target plate. The gun slaving speed could be calculated according to the displacement and time of laser spot. Based on feature point imaging, a transformation matrix is built according to the perspective transformation principle, through which an image correction model is acquired, thus enabling to realize the perspective distortion correction of laser spot images on the target plate. Laser spot on the corrected image is extracted, and its barycenter is computed to get the displacement and time of the barycenter. The gun slaving speed is calculated. Experimental results show that the proposed measuring method has 10 times higher measuring accuracy of gun slaving speed than that of the traditional method. The method is applicable to range test and other measuring engineering of gun slaving speed.

Key words: ordnance science and technology, image processing, gun slaving speed, perspective transformation, distortion correction