Pixel density converting apparatus

Details Pixel density converting apparatus Pixel density converting apparatus

1993-11-30

1994-09-27

Brinich, Stephen

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358456, G06K 900

Patent

active

053511379

ABSTRACT:
In a pixel density converting apparatus according to the present invention, a pixel density conversion element for converting a pixel density by a factor of an arbitrary value, such as an element of the projection method or the linear interpolation method, a pixel density conversion element for increasing or decreasing a pixel density by a factor of an integer, such as an element of the majority or logical OR method, and a binarization element for conducting binarization while correcting quantizing errors, such as an element of the error diffusion method or the average error minimizing method, are combined with each other with the advantages and disadvantages of the respective elements taken into consideration, so as to achieve excellent conversion whether or not the image on which pixel density conversion is conducted or an image area is a pseudo half-tone processed image. In consequence, excellent pixel density conversion is achieved on a binary image in which a pseudo half-tone processed image and characters or line drawings are present in a mixed state.

REFERENCES:
patent: 4389677 (1983-06-01), Rushby et al.
patent: 4633326 (1986-12-01), Endoh et al.
patent: 5008950 (1991-04-01), Katayama et al.
patent: 5050000 (1991-09-01), Ng
patent: 5068746 (1991-11-01), Ohsawa et al.
patent: 5077810 (1991-12-01), D'Luna
"Digital Halftoning of Images" IBM Journal of Research & Development, vol. 26, No. 6, pp. 687-697.

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