Circuit for correction of white pixel defects and an image...

Details Circuit for correction of white pixel defects and an image... Circuit for correction of white pixel defects and an image...

2006-09-12

2006-09-12

Ahmed, Samir (Department: 2624)

Image analysis

Image enhancement or restoration

Intensity, brightness, contrast, or shading correction

C382S166000, C382S275000, C358S003260, C358S003270

Reexamination Certificate

active

07106912

ABSTRACT:
A circuit for correction of white pixel defects capable of complementing white pixel faults without using a storage device for holding white pixel fault spots, and an image sensor using the circuit for correction of white pixel defects. Pixels constituting a pixel section are sequentially subjected to white pixel fault complementation process. A nearby pixel data holding section acquires pixel data from a readout circuit and holds the data. A comparison-determination section compares lightness of a target pixel with that of a nearby pixel and determines, based on the comparison result, whether or not the target pixel is associated with a white pixel fault having a lightness higher than that of the nearby pixel by a predetermined value or more. When it is judged by the comparison-determination section that the target pixel is associated with a white pixel fault, a complementary calculation section performs a complementary calculation by using the pixel data of the target and nearby pixels held by the nearby pixel data holding section, to generate complemented data.

REFERENCES:
patent: 5737453 (1998-04-01), Ostromoukhov
patent: 6111981 (2000-08-01), Tsubusaki et al.
patent: 6483606 (2002-11-01), Klassen et al.
patent: 6671068 (2003-12-01), Chang et al.
patent: 6847732 (2005-01-01), Sakatani

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