Video coder providing implicit coefficient prediction and scan adaptation for image coding and intra coding of video

Abstract From the Canadian patent

A predictive video coder performs gradient prediction based on previous blocks of image data. For a new block of image data the prediction determines a horizontal gradient and a vertical gradient from a block diagonally above the new block (vertically above a previous horizontally adjacent block). Based on these gradients the encoder predicts image information based on image information of either the horizontally adjacent block or a block vertically adjacent to the new block. The encoder determines a residual that is transmitted in an output bitstream. The decoder performs the identical gradient prediction and predicts image information without need for overhead information. The decoder …