Image forming device for enhancing tone reproduction by changing

Details Image forming device for enhancing tone reproduction by changing Image forming device for enhancing tone reproduction by changing

1991-10-07

1994-02-15

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358459, 358458, G06F 312, G06F 1566

Patent

active

052872092

ABSTRACT:
An image forming device which perform tone reproduction of a by changing the size of dots according to input image data comprising a plurality of pixels, each of which has an image density. A block partitioning portion partitions the input image data into blocks, each which has a predetermined number of pixels and each of the pixels having a predetermined position within each of the blocks. A tone modulation portion determines priorities corresponding to predetermined positions of the pixels within each of the blocks and changes the size of the dots according to the image densities of the pixels within the block. The tone modulation portion increases the size of the dots corresponding to the pixels in such a manner that the size of one of the dots corresponding to one of the pixels is larger than that of another one of the dots corresponding to another one of the pixels having a lower priority than one of the pixels but having the same image density. The degradation of resolution and moire effects are avoided.

REFERENCES:
patent: 4491875 (1985-01-01), Kawamura
patent: 4651287 (1987-03-01), Tsao
patent: 4701811 (1987-10-01), Moriguchi et al.
patent: 4709149 (1987-11-01), Takahashi et al.

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