Method and device for detection of moving points in a television image for digital television systems providing conditional-replenishment bit- rate compression

摘要

In a method for detection of moving points in a television image for digital television systems providing conditional-replenishment bit-rate compression, the image is split-up into blocks of N×M points, the points of one block being located at the intersections of N lines and M columns of the image. The N×M inter-image differences between values of luminance and/or of chrominance are converted to N×M coefficients by means of an orthogonal transformation. The absolute values of the coefficients obtained are compared with one or a number of predetermined reference thresholds in order that the points placed at the center of a block should be stated as moving when the absolute value of at least one coefficient obtained as a result of this transformation is higher than at least one predetermined reference threshold.P PThe device comprises an array of shift registers for storing the inter-image differences, a matrixing element for calculating the coefficients and a decision element.