Under one embodiment, a first and a second similarly constituted detector, and an OR gate coupled to the two detectors, are provided to a digital video system. The first detector detects quantization errors of numerically adjacent values in vertically adjacent pixels of a current frame. The second detector...http://www.google.de/patents/US5335019?utm_source=gb-gplus-sharePatent US5335019 - Digital video data quantization error detection as applied to intelligent dynamic companding
