Revisiting the JPEG-LS prediction scheme

The authors investigate the prediction scheme of JPEG-LS, the latest JPEG s tandard for lossless/near lossless image compression. They show that it is not sufficient to consider only horizontal and vertical edges in constructi ng predictive values. As a result, they propose an additional diagonal edge detection scheme to achieve better prediction accuracy and hence provide p otential for further improvement. Experiments show that, in terms of mean-s quare-error values, the proposed scheme outperforms the existing JPEG-LS pr ediction for all images tested, while the complexity of the overall algorit hm is maintained at a similar level.