Computer graphics processing and selective visual display system – Computer graphics processing – Attributes
Reexamination Certificate
2005-09-16
2010-10-05
Mengistu, Amare (Department: 2629)
Computer graphics processing and selective visual display system
Computer graphics processing
Attributes
C345S596000, C345S598000, C345S599000, C345S605000
Reexamination Certificate
active
07808510
ABSTRACT:
An image processing apparatus, an image transmission apparatus, a display, an image processing method and an image transmission method, capable of suppressing tone or gray-level distortion before and after dithering as well as reducing and then increasing the number of bit-planes of an image. An image processing apparatus comprises a first image processor for performing multi-level dithering based on a two-dimensional dither matrix to reduce the bit-plane number of a raster image as an original image, a memory for storing image data of the raster image whose bit-plane number has been reduced by the first image processor, and a second image processor for performing bit addition for the image data read out from the memory to increase the bit-plane number thereof. The first image processor applies to the multi-level dithering the sum of threshold values generated by a threshold generator and offset values generated by an offset generator for minimizing the difference between the signal value of the original image and the average of all the dither values of the raster image whose bit-plane number has been increased. A threshold matrix is obtained by changing matrix values of the two-dimensional dither matrix corresponding to matrix values of an offset matrix not being “0” (zero) to values other than their original values, respectively.
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patent: 5815286 (1998-09-01), Matsuba et al.
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patent: 2004/0061904 (2004-04-01), Bradburn
patent: 2003-162272 (2003-06-01), None
“The New Image Electron Handbook” (Tokyo, Corona Publishing Co. Ltd., 1993), pp. 41-51.
Mengistu Amare
NEC Corporation
Rainey Robert R
Sughrue & Mion, PLLC
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