APPARATUS FOR PROCESSING A TELEVISION SIGNAL INCLUDING A MOVEMENT DETECTOR

摘要

PCT No. PCT/GB85/00117 Sec. 371 Date Nov. 15, 1985 Sec. 102(e) Date Nov. 15, 1985 PCT Filed Mar. 26, 1985 PCT Pub. No. WO85/04542 PCT Pub. Date Oct. 10, 1985.A movement detector is included in television signal processing apparatus in order to improve the performance of the apparatus. The detector evaluates an absolute frame difference signal on a sample by sample basis and, after comparison with a threshold level signal in order to remove the effects of noise is fed to an isolated point removal circuit where samples deemed to indicate movement are compared with surrounding samples and if identified as isolated are ignored. Adaptive control is provided if the threshold, the isolated point removal circuit and a quantizer circuit for non-linearly altering the frame difference signal.