Adaptive spatio-temporal compression/decompression of video imag

Details Adaptive spatio-temporal compression/decompression of video imag Adaptive spatio-temporal compression/decompression of video imag

1991-06-14

1993-07-13

Razavi, Michael T.

Image analysis

Histogram processing

For setting a threshold

382 37, G06K 936

Patent

active

052280985

ABSTRACT:
An adaptive spatio-temporal compression/decompression algorithm for a video image uses a quadtree hierarchy to represent each frame of the image, the quadtree hierarchy including intermediary nodes and leaves. For each leaf a temporal bit is added indicative of whether a significant intensity change occurred between two frames of the video image. If the temporal bit indicates the significant intensity change occurred between frames, then a new intensity value also is added to that leaf. A decoder using a state machine extracts from the resulting compressed data stream a start address, a block size and the new intensity value for each leaf having the significant intensity change between frames to update a display memory with the new intensity value at each pixel within the area defined by the start address and block size.

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M7.8 "Space-Variant Regular Decomposition Quadtrees in Adaptive Interframe Coding" by P. Strobach, D. Schutt, W. Tengler; Siemens AG; CH2561-9/88/0000-1096; 1988 IEEE; pp. 1096-1099.

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