Mixed Frequency domain and spatial of enhancement algorithm for infrared image

Homomorphic enhancement could eliminate the influence of uneven illumination in frequency domain algorithm. It could be made the dynamic range of image to compress and expanded the gray level image of the interested target and enhanced image detail; the top-hat and bot-hat can smooth the outline of the image in spatial domain. According to the background and the target exist on the problem of poor contrast in the infrared image. This paper presents a hybrid algorithm to enhance the image. It is use of the Gauss filter processing to enhance image details in the frequency domain and smooth the contours of the image by the top-hat and bot-hat transforms in spatial domain. Through the hybrid algorithm to enhanced the infrared image. Not only enhanced the infrared image of the details, but the outline of the image has also been smooth. Finally, the enhanced image is better than other algorithm of results.