| 摘要 |
PURPOSE: To accurately find out a moving vector by finding out a peak point related to a corresponding sampling point in a correlation function of high resolution from a sampling point in a correlation function of low resolution as a function of the moving variables of two pictures. CONSTITUTION: A luminance signal is inputted to an input terminal 1 in each frame, the signal is delayed only by one frame in a picture memory 2 and the delayed signal is processed by two-dimensional (2D) Fourier transformation on a processing stage 3. On the other hand, 2D Fourier transformation is applied to the luminance signal inputted to the input terminal 1 on a processing stage 4. The contents of these transformed information are inputted to a phase subtractor 5, a phase difference is determined and inputted to a processing stage 6 and a correlation function of low resolution is outputted. An output from the subtractor 5 is inputted to a changing unit 7 and extended, the extended output is processed by inverted Fourier transformation on a processing stage 8 and a correlation function of high resolution is outputted to a peak locator 10. On the other hand, an output from the processing stage 6 is inputted to a maximum sample locator 9, the prescribed number of sampling points of maximum amplitude is inputted from the locator 9 to the locator 10, a corresponding peak position in the correlation function of high resolution is determined by using the coordinates of these inputs and a moving vector is selected by a vector limiter 11 and outputted from an output terminal 12. |
