| 摘要 |
PURPOSE:To execute highly reliable smoothing by obtaining first the histogram of a density value in a local area, and making the density value processed by non-linear processing corresponding to the frequency of this histogram the output density value of the central position of the local area. CONSTITUTION:This system consists of a multi-level picture 11 inputted for smoothing, an nXn-local area read-out circuit 12, a histogram generation circuit 13, a weighted mean circuit 14, and a smoothed multi-level picture. Then, the density value of the local area of size mXn smaller than the multi-level picture of the size MXN is read out from the multi-level picture of the size MXN, and thus, the density histogram of optical density value width is obtained. After the density histogram is obtained, weight corresponding to the value of the historgram is added to the density value read out from the local area, and the mean value of these is calculated, and this mean value of the density is made the output density value of the central position of the local area, and it becomes the element of the smoothed multi-level picture. Thus, the highly reliable smoothing of the multi-level picture is executed. |
