Invention Grant
- Patent Title: Pixel defect preprocessing in an image signal processor
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Application No.: US14841345Application Date: 2015-08-31
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Publication No.: US09787922B2Publication Date: 2017-10-10
- Inventor: Sheng Lin , Suk Hwan Lim
- Applicant: Apple Inc.
- Applicant Address: US CA Cupertino
- Assignee: Apple Inc.
- Current Assignee: Apple Inc.
- Current Assignee Address: US CA Cupertino
- Agency: Meyertons, Hood, Kivlin, Kowert & Goetzel, P.C.
- Agent Robert C. Kowert
- Main IPC: H04N5/367
- IPC: H04N5/367 ; G06T5/00 ; H04N9/73

Abstract:
An image signal processor may include a sensor interface that includes a pixel defect preprocessing (PDP) component that performs an initial adjustment of pixel values for patterned defect pixels in raw pixel data captured by an image sensor. To adjust a patterned defect pixel, the PDP component may apply an interpolation technique to values in a gain lookup table according to the pixel's location in the image frame to determine the gain value for the pixel, and then apply the gain value to the pixel. The PDP component may provide the raw pixel data with the adjusted patterned defect pixels to two or more other modules for additional processing. The other modules may include an image processing pipeline that may detect other defective pixels in the raw pixel data and correct the patterned defect pixels and the other defective pixels, for example using a weighted combination of neighboring pixels.
Public/Granted literature
- US20170064227A1 PIXEL DEFECT PREPROCESSING IN AN IMAGE SIGNAL PROCESSOR Public/Granted day:2017-03-02
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