A molded invariant value of the difference image based on image matching sift

The present invention discloses a molded SIFT invariant value of the difference image based on the image matching method, mainly solves the prior art tracking and recognition, image matching method of a high real-time requirement, and a target mirror inversion match occurs where an error occurs during movement . A method for image matching weak and poor real-time situation, the present method provides an efficient mirroring process direction, while overcoming the mirroring effect dimensionality reduction reached. Which process is implemented: the input image information, extracts feature points calculated gradient magnitude and direction, to determine a main direction, which coordinates to the main rotational direction. The 16 * 16 pixel neighborhood is divided into 16 seed points, and two seed points axisymmetric calculating the difference modulo Eight seed points. Each seed point of the four-directional histogram plotted, the final composition of 8 * 4 = 32 sub-dimensional drawing. This invention not only solves the problem of image matching method of transformation, the original 128-dimensional vector will also Descriptors reduced dimension 32, greatly enhance the real-time method.