Hybrid error diffusion pattern shifting reduction using programm

Details Hybrid error diffusion pattern shifting reduction using programm Hybrid error diffusion pattern shifting reduction using programm

1996-06-06

1998-09-15

Moore, David K.

Image analysis

Image compression or coding

Quantization

382237, 358456, G06K 936

Patent

active

058091777

ABSTRACT:
A process eliminates pattern shifting artifacts in a printed image rendered using a hybrid high addressable error diffusion process by perturbing a threshold/image signal value relationship when a multi-level grey level is binarized. The process utilizes a programmable multi-level grey signal modifying circuit for modifying the multi-level grey signal by a predetermined value according to its grey level. The modified multi-level grey signal is binarized to a binary pixel signal according to a relationship between the modified multi-level grey signal and a threshold value. The process further generates an error corresponding to the relationship and diffuses the error to neighboring pixels. The multi-level grey signal is modified with either random noise multiplied by a grey level dependent coefficient or by a predetermined value from a checkerboard or vertical line pattern. The value from the pattern is dependent upon the grey level and pixel location of the image data.

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