Luminance processing system for compressing and expanding video data

摘要

PCT No. PCT/US91/03817 Sec. 371 Date Oct. 23, 1992 Sec. 102(e) Date Oct. 23, 1992 PCT Filed May 30, 1991 PCT Pub. No. WO91/19394 PCT Pub. Date Dec. 12, 1991.A circuit for compressing and expanding video data comprises a FIFO line memory and an interpolator. A timing circuit generates control signals for writing data into the line memory and for reading data from the line memory to compress and expand the data. The interpolator smooths the data expanded or to be compressed in the FIFO line memory. A switching network selectively establishes a first signal path in which the line memory precedes the interpolator for implementing the data expansion and a second signal path in which the interpolator precedes the line memory for implementing the data compression. The switching network is controlled according to selected display formats requiring compression or expansion, for example by a microprocessor.