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.
Type:
Grant
Filed:
June 14, 1991
Date of Patent:
July 13, 1993
Assignee:
Tektronix, Inc.
Inventors:
Regis J. Crinon, Ajay Luthra, Peter M. May, Stanley C. Edwards