Image compression method, decompression method thereof and...

Details Image compression method, decompression method thereof and... Image compression method, decompression method thereof and...

2007-08-21

2007-08-21

Lee, Thomas D. (Department: 2625)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S426010

Reexamination Certificate

active

10326980

ABSTRACT:
In a method of image compression in which vertical and horizontal white skipping are performed, data compression is performed in the regions containing black pixels other than the skipped regions. While vertical and horizontal white skipping being performed, in the other regions, regions are detected in which pixel values change in smooth fashion, such as the outlines of letters and encoding is performed using the pixel value of the leading column of the region, number of columns and amount of change of the pixel values. As a result, the compression factor of the image can be increased and a considerable contribution made to reduce the storage capacity for storage of data and reduce the time required for data transmission.

REFERENCES:
patent: 5777749 (1998-07-01), Noda et al.

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