Conditional replenishment device for a video encoder

Details Conditional replenishment device for a video encoder Conditional replenishment device for a video encoder

1998-06-09

2000-12-12

Kelley, Chris S.

Pulse or digital communications

Bandwidth reduction or expansion

Television or motion video signal

382251, H04N 514

Patent

active

061608483

ABSTRACT:
Conditional replenishment device in a video encoder having a motion estimator (22) providing a predicted block for each predefined block based upon estimating the motion between the predefined block of the current image and the corresponding block in the previous image, transformer (16) for transforming a prediction error resulting from the difference between the predicted block and the predefined block into the frequency domain, and quantizer (20) for quantizing the coefficients of the prediction error and providing the quantized coefficients to a video multiplex coding unit (30). Such a conditional replenishment device includes a change detector for producing a segmentation map in which each pixel of the predefined block is marked as moving or stationary, a motion determinator for determining whether there is a group of moving pixels the number of which exceeds a predetermined threshold defining a moving object in the image, and a coder for encoding only blocks containing the group of moving pixels.

REFERENCES:
patent: 4958226 (1990-09-01), Haskell
patent: 5043810 (1991-08-01), Vreeswijk
"Video Coding for Low Bitrate Communication", Draft ITU-T Recommendation H.263, May 1996.

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