Method and system for bad pixel correction in image sensors
AssigneeSamsung Electronics Co., Ltd.
InventorsYONATHAN AFLALO, NATHAN HENRI LEVY
Life of this patent
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Abstract
A method of detecting a bad pixel in an image sensor includes: determining, a first color of a center pixel of a Bayer patch output by the image sensor; extracting, a main patch, a first auxiliary patch, and a second auxiliary patch from the Bayer patch, having the first color, a second other color, and a third other color, respectively; generating a normalized patch of the first color from the main patch and the auxiliary patches that brings a level of the auxiliary patches to a level of the main patch; and detecting whether the center pixel of the Bayer patch is a bad pixel using the normalized patch.
Claims20
A method of detecting a bad pixel in an image sensor, the method comprising:
- determining, a first color of a center pixel of a Bayer patch output by the image sensor;
- extracting, a main patch, a first auxiliary patch, and a second auxiliary patch from the Bayer patch, having the first color, a second other color, and a third other color, respectively;
- generating a normalized patch of the first color from the main patch and the auxiliary patches that brings a level of the auxiliary patches to a level of the main patch;
- and
- detecting whether the center pixel of the Bayer patch is a bad pixel using the normalized patch.
An apparatus to detect a bad pixel in an image sensor, the apparatus comprising:
- a digital signal processor (DSP) configured to determine a first color of a center pixel of a Bayer patch output by the image sensor, extract a main patch, a first auxiliary patch, and a second auxiliary patch from the Bayer patch, having the first color, a second other color, and a third other color, respectively, generate a normalized patch of the first color from the main patch and the auxiliary patches that brings a level of the auxiliary patches to a level of the main patch, and detect whether the center pixel of the Bayer patch is a bad pixel using the normalized patch.
A digital camera comprising:
- an image sensor;
- a Bayer filter;
- an analog to digital converter configured to convert intensity of light sensed by the image sensor that passes through the Bayer filter into a Bayer patch;
- a storage device storing a table indicating which pixels of the image sensor are corrupted;
- and
- a digital signal processor (DSP) configured to extract a main patch, a first auxiliary patch, and a second auxiliary patch from the Bayer patch, having a first color, a second other color, and a third other color, respectively, generate a normalized patch of the first color from the main patch and the auxiliary patches that brings a level of the auxiliary patches to a level of the main patch, and update the table based on the normalized patch.
Dependencies are inferred from the claim text.