| 摘要 |
<P>PROBLEM TO BE SOLVED: To extremely reduce memory access frequency at the time of calculating the image edge histogram of an attention area from the differential binary image data of a photographic image ahead its own vehicle, and to reduce an image processing load for quickly calculating the image edge histogram of the attention area. <P>SOLUTION: The differential binary image data of each pixel of a photographic image ahead of its own vehicle are formed, and the cumulative frequency data of the differential binary image data are formed by repeating the addition and accumulation of the differential binary image data, and the cumulative frequency data of each pixel of at least the set attention region of the photographic image are written in a memory so that cumulative frequency data can be formed, and the cumulative frequency data of the respective accumulation start and terminal pixels of the attention region are read from the cumulative frequency table, and a difference is calculated, and the image edge histogram of the cumulative direction of the attention region is calculated with a few memory access frequency. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
