| 摘要 |
PCT No. PCT/GB86/00799 Sec. 371 Date Oct. 5, 1987 Sec. 102(e) Date Oct. 5, 1987 PCT Filed Dec. 23, 1986 PCT Pub. No. WO87/04034 PCT Pub. Date Jul. 2, 1987.A video signal received from a source (10) is bandwidth-compressed by filters (12, 14, 16), filter (14) being a temporal filter and filter (16) being a spatial filter. Selection of the filter to be used is dependent upon picture content. The transmitter reconstitutes in interpolators (44, 46) the signal which would be regenerated at the receiver, determines which filter gives the best results, and transmits an indication of which filter has been used in a digital signal associated with the analogue video signal. Preferably a determination of motion vectors associated with the signal is made and the digital signal indicates which of the determined motion vectors is applicable to different areas of the picture. By transmitting the control signal digitally with the analogue video signal the receiver circuitry is greatly simplified while its reliability is improved. |
