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Recently, users can get countless images and videos by network. So, the compression technology of image and video is researched more and more. However, the situation which is the interested range of the image is occurred. For instance, since the region of face is more important than background, the image compression technology bases on the region of interest (ROI) is necessary, in the ATM environment. In this research, given the human visual system, which are not sensitive to illumination variations at very dark and light regions of image, we calculate the standard deviation of block and use this value to define the ROI. In encoding process, the relatively high quality can be obtained at the ROI and the relatively low quality can be obtained at the non ROI. In proposed scheme, the feature which is the encoding process according to subjectively image quality can be demonstrated. Finally, this proposed scheme is applied to JPEG standard. The experimental results demonstrate that proposed scheme can achieve better image quality at the high compression ratio.  : , , JPEG,   Key word : ROI, Non ROI, JPEG, Image compression Journal of the Korea Institute of Information and Communication Engineering (J. Korea Inst. Inf. Commun. Eng.) Vol. 18, No. 3 : 679~686 Mar. 2014

The Study about the Differential compression based on the ROI(Region Of Interest)