Infrared image splicing method

The invention relates to an infrared image splicing method. The technical problems that according to spliced images obtained through three common image gray scale consistency correction methods in the prior art, the gray scale values of the same target in the spliced images are inconsistent, the gray scale consistency of the images is affected, and consequently obvious splicing seam areas exist in the spliced images are solved. The method specifically comprises the following steps: step 1, arranging a first camera and a second camera, controlling the first camera and the second camera to shoot a scene to be spliced at the same time, and outputting infrared images UA and UB; the method comprises the following steps: step 1, setting a collimator, obtaining a homonymy point set PA and a homonymy point set PB, and obtaining a gray scale mapping function relation f (g) by using a D-term fitting method, step 2, mapping each pixel gray scale in UB according to the gray scale mapping function relation f (g), and obta