High-speed binary image compression method

Details High-speed binary image compression method High-speed binary image compression method

2006-03-14

2010-12-14

Ishrat, Sherali (Department: 2624)

Image analysis

Image compression or coding

Reexamination Certificate

active

07853087

ABSTRACT:
A high-speed binary image compression method, the method including calculating an estimation value of a current pixel based on a context value derived from neighboring pixels of the current pixel, determining whether a pixel value of the current pixel, the context value of the current pixel, and the estimation value of the current pixel are identical to one another, and determining whether the current pixel is a continuous pixel having a pixel value that is continuously identical to previous pixels input prior to the current pixel, determining whether the previous pixels are continuous pixels, if the current pixel is determined not to be continuous with the previous pixels, and coding the continuous pixels using a block unit having more than one pixel if the previous pixels are determined to be the continuous pixels, and determining block by block whether pixels input after the current pixel are continuous pixels if the current pixel is a continuous pixel, and coding the continuous pixels block by block. The method can enhance a coding speed by detecting and coding blocks each having continuous and identical pixel values in a binary image by the block unit.

REFERENCES:
patent: RE37272 (2001-07-01), Ochi et al.
patent: 6343157 (2002-01-01), Yada
patent: 10-191068 (1998-07-01), None
patent: 2001-238087 (2001-08-01), None
patent: 2003-069834 (2003-03-01), None
patent: WO 01/29771 (2001-04-01), None

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