| 摘要 |
PURPOSE:To obtain the information on the picture structure of a specific direction by obtaining a distribution on a specific line passing through the center on a 2-dimensional Fourier space exclusively by performing a 1-dimensional Fourier transform for a projection waveform from a picture having variable density supplied to a picture processor. CONSTITUTION:A straight line to be projected is shown in an equation ax+by+ c=0, and l1-l3 of this projection waveform mean the cumulative values of each density level of the picture. Thus the density level is obtained for an area a picture f (x, y) overlaps an equation bx-ay+d+pi=0 which is vertical to the first equation. An operator 1 obtains cumulative values (x) and (y) of each clock number every time clocks (x) and (y) are applied for raster scan. At the same time, pi=ay-bx-d is also obtained. The pi is applied to a memory 3 through an MPX2 in the form an address (n), and the contents D(n) are sent to a latch 4 to be added with the density level of a picture having variable density given from a line 8. The result of this addition is written again to an (n) address. Hereafter this procedure is carried out to the entire part of a screen. |
