Image analysis – Image compression or coding – Gray level to binary coding
Patent
1996-03-18
1998-08-04
Rogers, Scott A.
Image analysis
Image compression or coding
Gray level to binary coding
382252, 358456, 358458, H04N 7405
Patent
active
057907048
ABSTRACT:
An image processing apparatus includes a circuit for correcting a first image data of a target pixel corresponding to a correction amount, a circuit for generating a third image data on the basis of the second image data and a preset threshold value, the third image data having a gradation value less than one of the second image data, a circuit for comparing the second image data with the third image data to output a difference value therebetween, and a circuit for deriving the correction amount. based on the difference value to randomly diffuse the difference value to the peripheral portion of the target pixel and supplying the correction amount to the correcting circuit.
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patent: 5530561 (1996-06-01), Shimazaki
patent: 5577136 (1996-11-01), Tanioka et al.
Robert Ulichney, "Digital Halftoning", The MIT Press, 1987.
1995 General Meeting of Institute of Electronic Information and Communication. Fukuoka, Japan, Mar. 1995. "Error Diffusion Method By Bit-Mask Error Filtering", D-473, G. Rao et al.
Kanno Hiroki
Rao Gururaj
Kabushiki Kaisha Toshiba
Rogers Scott A.
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