Method and apparatus for non-linear dithering of digital images

Details Method and apparatus for non-linear dithering of digital images Method and apparatus for non-linear dithering of digital images

1989-09-28

1994-12-06

Hjerpe, Richard

Computer graphics processing and selective visual display system

Display peripheral interface input device

Light pen for fluid matrix display panel

358457, G09G 510

Patent

active

053715152

ABSTRACT:
The method and apparatus of the present invention takes into consideration that the eye is more sensitive to intensity variations at low levels of intensity than at high levels of intensity and produces higher quality dithered images by employing a sectioned or piecewise linear quantization strategy which sacrifices the fineness of interval spacing at the high end of the intensity scale in order to achieve greater accuracy of reproduction at the low end. The input intensity values are divided into a plurality of sub-ranges indicative of low intensities and high intensities. The number of input intensity levels allocated to the low intensity sub-ranges is small and the number of quantized or output intensity levels allocated to the low intensity sub-ranges is large compared to those allocated to the high intensity sub-ranges such that the interval spacing at the low intensity sub-ranges is small to provide greater accuracy at the low intensity levels where the eye is most sensitive.

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patent: 3997719 (1976-12-01), Judice
patent: 4651293 (1987-03-01), Kato
patent: 4706077 (1987-11-01), Roberts et al.
patent: 4736254 (1988-04-01), Kotera et al.
patent: 4796094 (1989-01-01), van Dorsselaer
patent: 4823189 (1989-04-01), Haines et al.
Gerald Goertzel, Gerald R. Thompson, "Digital half-toning on the IBM 4250 printer" IBM General of Research and Development vol. 31 No. 1 Jan. 1987.

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