Patent ID: 8319890
Filing Date: 2012-11-27
Classification: H04N

Abstract:
1. An arrangement for generating a pull-down switch-off signal for a video compression encoder, which signal is determined by the arrangement in dependence on a converted signal which is produced from an NTSC signal by means of an inverse 3:2 pull-down conversion, wherein the circuit arrangement includes a Mean Absolute Distortion detector and a circuit for determining Hadamard coefficients, wherein the MAD detector produces a MAD signal which indicates for each block of predefined size the difference between the picture contents of two consecutive frames, wherein the circuit for determining the Hadamard coefficients delivers two coefficients in blocks per frame, from which coefficients a first coefficient indicates the sum of the differences of the pixels of adjacent scanning lines i and i+1 and a second coefficient indicates the sum of the differences of the pixels of scanning lines i and i+2, and wherein the pull-down switch-off signal is generated in dependence on the values of the MAD signal summed for all the blocks of a frame and in dependence on the two Hadamard coefficients summed for all the blocks of a frame.