Apparatus and method for adjusting sharpness of image

Details Apparatus and method for adjusting sharpness of image Apparatus and method for adjusting sharpness of image

2006-06-19

2009-06-09

Rogers, Scott A (Department: 2625)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S003270, C382S261000, C382S266000, C382S274000

Reexamination Certificate

active

07545539

ABSTRACT:
A method for adjusting a target gray level of a target pixel based on a spatial mask is provided. The target pixel is surrounded with N adjacent pixels; each of the N adjacent pixels respectively has an adjacent gray level. The method first multiplies the target gray level with a sharpness index to generate an amplified target gray level and respectively multiplies each of the adjacent gray level with an adjacent index to generate N modified adjacent gray levels. Then, the amplified target gray level and the N modified adjacent gray levels are added up to generate a first gray level sum. The method multiplies the first gray level sum with a multiplying parameter to generate a second gray level sum. At last, the method divides the second gray level sum by a dividing parameter to generate an adjusted gray level for the target pixel.

REFERENCES:
patent: 5481376 (1996-01-01), Kawashima
patent: 6016370 (2000-01-01), Hatakeyama et al.
patent: 7463785 (2008-12-01), Ebisawa
patent: 2008/0118176 (2008-05-01), Li et al.

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