| 摘要 |
An image display system forms an output video signal which is composed of successive frames, the output video signal including a plurality of windows, each of which contains image information from an own input video signal in each frame. The image information from the input video signals is written into a memory wherefrom subsequently successive frames of an output video signal are read, each time from a respective series of locations of the memory. Upon reading, a concatenation of the respective series of the successive frames is formed. The locations are periodically repeated in this concatenation with a period of recurrence which is longer than a single series, the locations of the respective series of each frame at an end being coincident in an overlapping fashion with the locations at the beginning of the series of a directly preceding frame. Despite the overlap, no image information of the windows will be overwritten before it has been read, provided that the overlap is smaller than the minimum number of locations used in a series between the beginning and the end of a window. In the case of rectangular windows, the minimum height of the windows thus defines the overlap. |
