Bild-Bewegungsmessung.

摘要

A region from two frames of a television picture is subjected to Fourier transform in processing stages (3 and 4) one via a picture memory (2), and the resulting transforms compared in a comparator (5) whose output is subjected to inverse Fourier transform in a processing stage (6). The output of comparator (5) is also applied to a sample rate modifier (7) in which this output is enlarged prior to being subjected to inverse Fourier transform in a further processing stage (8). The outputs of processing stages (6 and 8) are respectively low and higher correlation functions of one pixel and one-quarter pixel resolution respectively. A given number, say 20, of sample points of greatest magnitude in the low resolution correlation function are selected in a largest vector selector (9) whose coordinates are used in a peak locator (10) which locates the peaks in the higher resolution correlation function associated with the selected samples to produce coordinates for these peaks to quarter pixel accuracy. A limited number of these, say 10, can be selected by a vector limiter (11) if used with a system having limited data capacity for motion vectors.