Defective pixel correction device and method of operating the same
AssigneeSamsung Electronics Co., Ltd.
InventorsChang Hoon Choi, Hyunyup Kwak, Jaeuk Ahn, Yongmi Lee, Seungwon Choi
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Abstract
A defective pixel correction device is provided. The defective pixel correction device includes: a pixel grading circuit configured to output a grade map including a plurality of grades indicating defect levels and respectively corresponding to a plurality of pixels included in an input image; a pixel selection circuit configured to select one or more candidate pixels from among the plurality of pixels, based on whether the plurality of grades correspond to a correction level, in the grade map; and a correction circuit configured to correct the one or more candidate pixels.
Claims16
A defective pixel correction device comprising:
- a pixel grading circuit configured to output a grade map comprising a plurality of grades indicating defect levels and respectively corresponding to a plurality of pixels included in an input image, wherein the plurality of pixels comprises red pixels, green pixels and blue pixels arranged in a regular pattern;
- a pixel selection circuit configured to select one or more candidate pixels from among the plurality of pixels, based on whether the plurality of grades correspond to a correction level, in the grade map;
- and
- a correction circuit configured to:
- calculate one or more correction values based on the one or more candidate pixels and a plurality of neighboring pixels included in an image patch, wherein the image patch includes the one or more candidate pixels;
- correct the one or more candidate pixels based on the one or more correction values;
- and
- replicate the image patch for each of the one or more candidate pixels.
A method of operating a defective pixel correction device, the method comprising:
- assigning a plurality of grades, among grades indicating defect levels, to a plurality of pixels included in an input image, respectively, wherein the plurality of pixels comprises red pixels, green pixels and blue pixels arranged in a regular pattern;
- outputting a grade map comprising the plurality of grades;
- selecting one or more candidate pixels from among the plurality of pixels, based on whether the plurality of grades correspond to a correction level, in the grade map;
- correcting the one or more candidate pixels;
- replicating an image patch for each of the one or more candidate pixels;
- and
- calculating one or more correction values based on the one or more candidate pixels and a plurality of neighboring pixels included in the image patch.
An electronic device comprising:
- an image sensor comprising red pixels, green pixels and blue pixels arranged in a regular pattern;
- a pixel grading circuit configured to output a grade map comprising a plurality of pixels to which a grade, among a plurality of grades indicating defect levels, is assigned, based on the grade being assigned, wherein the plurality of pixels are included in an input image output from the image sensor;
- a pixel selection circuit configured to select one or more candidate pixels, having the grade corresponding to a correction level, in the grade map;
- and
- a correction circuit configured to:
- calculate one or more correction values based on the one or more candidate pixels and a plurality of neighboring pixels included in an image patch, wherein the image patch includes the one or more candidate pixels;
- correct the one or more candidate pixels based on the one or more correction values;
- and
- replicate the image patch for each of the one or more candidate pixels.
Dependencies are inferred from the claim text.