Vorrichtung und Verfahren zur Überblendungsdetektion und Überblendungsinformationscodierung

摘要

An fade detection device (100) detects fade transitions in a image data signal used for image data compression provided with: an inter-frame difference calculation device (12) calculates the absolute value of the difference at each pixel between two frames, and the sum of the absolute values at all pixels of one frame; a pixel block detection device calculates (3) the absolute value of the difference at each pixel between two pixel blocks, each of which is subdivided from one frame, and detecting a pair of blocks to obtain the minimum value for the sum total of the absolute values at all pixels of one block; an predictive difference calculation device (4) calculates the one frame total of said sum total of the absolute values at all pixels of one block in each pair of blocks detected by said pixel block detection device; a judging device (13) judges whether said fade transitions is generated or not, using said sum total of the absolute values at all pixels of one frame and the one frame total.