Adaptive raster scan for slice/frame coding

In this paper, new raster scan orders other than the conventional horizontal scan from the top-left corner of the image/slice are proposed to fully exploit content correlation from the regions right to and below the current coding unit. By being applied to each slice/frame adaptively with the conventional one, features influencing the scan order selection are investigated. Different adaptive scan schemes are tested and compared. Up to 3.4% bit-rate reduction can be achieved for Intra coding with limited increase in complexity.