| 摘要 |
PURPOSE:To obtain a binary image in which dots are disposed in slant line with a simple control by dividing a variable density image into matrix from binarizing with different thresholds, then storing the result, and adding an offset value to one read address to read it. CONSTITUTION:In an offset register 20, a quantity D to be offset is set. A load signal S1 is generated during a blank period during which the X-direction scanning ends and shifts to the subsequent row for odd-th matrix rows, so that the offset value D from the register is set as the initial value of an X- address generator 22. The generator 22, in synchronism with the read of a memory(not shown in the figure) to store a multi-level image data, outputs an X-address Xa, while an Y-address generator 24 outputs a Y-address Ya. A memory 26 is accessed with the addresses Xa, Ya, and a corresponding threshold S3 is outputted from there. A read signal S2 is supplied to a comparator 28, where it is binarized by using the threshold S3 read out from the memory 26 and outputted as a binary image signal S4.
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