Infrared image enhancing method

The embodiment of the invention discloses and provides an infrared image enhancing method. According to the method, images are used for histogram statistics, in addition, the histogram is calculated for obtaining the gray level array of the pixel point number extreme value, the array is used for judging whether the histogram distribution belongs to a single-peak type or a double-peak form or not, the respective unfolding regions and compressions are obtained according to different types of the histogram distribution, the linear conversion is utilized for unfolding and compressing the gray scale level in the unfolding regions and the compression regions by using linear conversion, and finally, the goal of enhancing the images is reached. The algorithm is simple, the complicated algorithm is avoided, and meanwhile, the method overcomes the defects that in the gray level direct linear conversion process, the background and the noise are enhanced, the target gray scale level cannot be effectively enhanced, the image brightness is dark, and the like.