08259198 is referenced by 27 patents and cites 96 patents.

Various techniques are provided for the detection and correction of defective pixels in an image sensor. In accordance with one embodiment, a static defect table storing the locations of known static defects is provided, and the location of a current pixel is compared to the static defect table. If the location of the current pixel is found in the static defect table, the current pixel is identified as a static defect and is corrected using the value of the previous pixel of the same color. If the current pixel is not identified as a static defect, a dynamic defect detection process includes comparing pixel-to-pixel gradients between the current pixel a set of neighboring pixels against a dynamic defect threshold. If a dynamic defect is detected, a replacement value for correcting the dynamic defect may be determined by interpolating the value of two neighboring pixels on opposite sides of the current pixel in a direction exhibiting the smallest gradient.

Title
System and method for detecting and correcting defective pixels in an image sensor
Application Number
12/582400
Publication Number
8259198 (B2)
Application Date
October 20, 2009
Publication Date
September 4, 2012
Inventor
Jeffrey E Frederiksen
Sunnyvale
CA, US
Guy Cote
San Jose
CA, US
Agent
Fletcher Yoder PC
Assignee
Apple
CA, US
IPC
H04N 9/68
H04N 9/64
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