INTRA-FRAME PREDICTIONWITH LAPPED TRANSFORMS FOR IMAGE CODING

In this paper we propose the use of intra-frame prediction with lapped transforms for image coding. Both lapped transforms and intra prediction exploit the redundancies of neighboring blocks and the combination of the two techniques results in a very efficient image coding scheme. The difficulty to com-bine them comes from the necessity to use for the prediction of the current block pixels in the causal neighborhood that have not been completely processed by the overlapping trans-form. We show how to overcome this difficulty, and thus the system presented here outperforms the traditional one, using intra-prediction and DCT, and the direct application of lapped transforms in all tested images. Index Terms — Lapped transforms, intra-frame predic-tion, image coding, H.264/AV