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Threshold matrix generation device and method for generating threshold matrix for generating threshold matrix of predetermined size used for halftone processing of multitone image data using dithering method
Threshold matrix generation device and method for generating threshold matrix for generating threshold matrix of predetermined size used for halftone processing of multitone image data using dithering method
A threshold generation device sets a ratio of a length along a main scanning direction to a length along a sub-direction based on a relation between image reproducibility in the main scanning direction and image reproducibility in the sub-direction of an image processing device for forming an image on a paper based on an image data obtained by the halftone processing. The device determines spatial frequency characteristics having a domain of an ellipse shape having set major axis and minor axis as peak values. The device sets a threshold value of each pixel of the threshold matrix in accordance with the determined spatial frequency characteristics.
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