Pre-lightening enhancement processing method and device for infrared weak point target

The invention relates to an infrared weak point target pre-lightening enhancement processing method and device, and relates to the field of thermal infrared imager image preprocessing. The method comprises the following steps: acquiring an infrared image, and traversing the image to obtain a 3 * 3 neighborhood extreme point; multi-level gradients of neighborhoods such as 3 * 3, 5 * 5, 7 * 7 and 9 * 9 of the extreme points are calculated; calculating a change rate between multistage gradients of extreme points, and estimating weak target similarity features; detecting and marking the weak point targets according to the weak point target similarity features; and the detected weak point targets located in different gradient feature intervals are processed by adopting a pre-lightening enhancement processing method, so that a pre-lightening enhanced and noise-reduced image is obtained, and meanwhile, image details are better protected. According to the method, the infrared thermal imaging characteristic and the di