| 摘要 |
PURPOSE:To execute high speed processing by extracting the local characteristic of an image with a concentration value statistic and selecting a weighting function in accordance with a local characteristic. CONSTITUTION:At the time of the weighted average, instead of making all picture element points in a window as a calculating object, by executing suitability the thinning and processing in accordance with a window size, in case, the image size, which is especially an object, is large, the window size comes to be also large, and therefore, substitution can be executed by the average of the thinned picture element point. Instead of executing the weighted average of all windows with the same weighting function, by changing over the weighting function in accordance with the local characteristic, the average in the most part of the window can be executed by a simple average calculation according to the image. Concretely, when the weighted average of a central picture element 32 is obtained, a slanting line part 310 only is calculated and the calculation of the white part 320 is omitted. At a window 410 which is not influenced, the simple average processing may be executed and the weighted average may be obtained only for an area 420 with a large influence. |
