| 摘要 |
PURPOSE:To increase the accuracy of data for position shift detection by adding statistical processing of smoothing to position shift processing and optimizing the quantity of a shift. CONSTITUTION:Nine-bit squares 9 and 10 are extracted from the entire planes of images 7 and 8 at the same positions and data 11 at the center point of one square 9 is ORed exclusively with all data of the other square 10. Data of the square 10 which have the same value with the data 11 at the center position of the square 9 are given a value 1 through said logical operation and an integral counter 13 counts up by one. This logical operation is carried out (512-9)X(512-9) times for the entire planes of the images 7 and 8 to extract 9-bit squares while the squares are shifted by one bit longitudinally and laterally, so that the value of the integral counter is graphed as shown in 14. Data of the graph 14 are smoothed to obtain a graph 17 and there is only one counter having a minimum value, so that accurate position shift detection is performed.
|
