Hybrid algorithm for low contract image and image sequence enhancement

In order to improve the visual quality of images and image sequence in low contrast, amplifying the difference of foreground target, a method based on the combination of non-linear luminance commutation and strengthened algorithm of improved Logarithmic Image Processing (LIP) and interframe light compensation is proposed. At first, low contrast images are classified as over-bright and over-dark. Then an improved non-linear luminance commutation method and improved self-adjusting LIP factor method are proposed separately, achieving a better effect in increasing contrast. To strengthen the vision effect of movement image in low contrast, further adjust of luminance is executed partially, according to movement image sequence with inter-frame correlation. Experiment result indicates that, this easy and rapid algorithm will not only guarantee better vision quality, but also provides great vision quality in RGB color space.