| 摘要 |
PROBLEM TO BE SOLVED: To reduce a memory space in an image forming apparatus having a quasi-intermediate tone processor wherein a threshold matrix possesses a screen angle. SOLUTION: A threshold matrix having a screen angle only in a minimum memory space is generated by controlling an address of the memory space of the threshold matrix consisting of a tetragonal lattice. As a result, a mesh point generating circuit is comprised ofγtables 1, 4, a threshold matrix memory 3 for generating a threshold value and control circuits 101-108 for controlling the operation of the threshold matrix memory 3. The control circuit 101-108 control the address of the threshold matrix memory 3 corresponding to the number of pixels in a basic cell size which is a target of a parameter for generating the threshold matrix and the number of pixels forming a region of repeating obtained from the screen angle.
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