Frequency domain correlation semi-dense remote sensing image matching method

The invention belongs to the technical field of digital image processing, discloses a frequency domain correlation semi-dense remote sensing image matching method, and aims to obtain matching information between two images. The method comprises the steps of: twisting one of the two images according to the initial matching information to obtain an image to be matched; dividing the reference image and the to-be-matched image into a plurality of areas; taking four small regions as a group of region blocks, setting the centers of the region blocks as seed points, and counting histograms in gradient directions of the region blocks to obtain gradient amplitudes and angles corresponding to four angle ranges; setting four different levels of priority values; obtaining a new matching result combined with the four-neighborhood direction gradient information of the seed point; adding matching results of all the seed points into the sparse matching point set to obtain a semi-dense remote sensing image matching point set;