Adaptive Contrast Enhancement in DCT Domain
Yong‐Joon Jeon, Minyoung Eom, Yoonsik Choe · Journal of the Institute of Electronics Engineers of Korea · 2005
Images coded by DCT based compression contain several quality degradations by quantization process. Among them contrast distortion is the important one because human eyes are sensitive to contrast. In case of low bit-rate coded image, we can not get an image having good quality due to quantization error. In this paper, we suggest a new scheme to enhance image's contrast in DCT domain. Proposed method enhances only edge regions. Homogeneous regions are not considered in this method. DCT coefficient blocks are decomposed to sub-blocks for detail edge region discrimination. we could apply this scheme to real-time application because proposed scheme is DCT based method.