Image analysis – Image enhancement or restoration – Variable threshold – gain – or slice level
Reexamination Certificate
2007-02-20
2007-02-20
Bali, Vikkram (Department: 2624)
Image analysis
Image enhancement or restoration
Variable threshold, gain, or slice level
C358S003220
Reexamination Certificate
active
10309328
ABSTRACT:
An image brightness level conversion method and apparatus which converts a multi-valued brightness level of an input pixel to a bi-valued brightness level using a threshold value. If the input pixel is determined to belong to an edge area, a predetermined reasonable distance by which dots should be isolated is reduced by a noise component and the threshold value is produced using the reduced distance. If the input pixel is determined not to belong to the edge area, the threshold value is produced without using the noise component. The method provides a uniform distribution of dots on the 2-dimensional space, a decrease in a generation of a void region where no dots appear around the edge area, a reduction of unpleasant appearing fixed patterns between dots, and a decrease in the generation of a typical pattern in which dots with a same color are diagonally arrayed.
REFERENCES:
patent: 5535019 (1996-07-01), Eschbach
patent: 5917614 (1999-06-01), Levien
patent: 6160921 (2000-12-01), Marcu
patent: 6671068 (2003-12-01), Chang et al.
patent: 6842267 (2005-01-01), Morimatsu
Cho Won-kyoung
Kang Ki-min
Bali Vikkram
LaRose Colin
Staas & Halsey , LLP
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