Video coder providing implicit or explicit prediction for image

Details Video coder providing implicit or explicit prediction for image Video coder providing implicit or explicit prediction for image

1997-08-11

1999-12-21

Le, Vu

Television

Bandwidth reduction system

Data rate reduction

348397, 348420, 348437, 348438, H04N 750

Patent

active

060056223

ABSTRACT:
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 computes the actual information based on the predicted information and the residual from the bitstream.

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