Resolution conversion of bitmap images

Details Resolution conversion of bitmap images Resolution conversion of bitmap images

1992-11-25

1993-12-14

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358448, 382 54, 382 47, H04N 140

Patent

active

052708365

ABSTRACT:
A method for improving the quality of bitmap image includes repeated iterations of doubling the resolution of an image and smoothing the doubled image. The doubling and smoothing steps are repeated until the intermediate image has a resolution which is greater than a desired resolution of an output image. After generating such an intermediate resolution image, the intermediate resolution image has its resolution reduced to the desired resolution by area mapping to generate a pseudo-gray scale image. The pseudo-gray image is then further processed to further improve the image quality, and then is converted to a true gray scale image or a binary image having the desired resolution.

REFERENCES:
patent: 4484188 (1984-11-01), Ott
patent: 4486785 (1984-12-01), Lasher et al.
patent: 4742553 (1988-05-01), Irwin
patent: 4771471 (1988-09-01), Kitamura
patent: 4945351 (1990-07-01), Naiman
patent: 4970604 (1990-11-01), Coueignoux
patent: 4975785 (1990-12-01), Kantor

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