Image calibration method and image processing system utilizing the method
AssigneePixart Imaging Inc.
InventorsCheng-Chung Chou, Yi-Hsien Ko, Wei-Ting Chan
Life of this patent
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Abstract
An image calibration method includes: (a) sensing at least one target pixel of a sensing row from an effective pixel region of an image sensor to generate at least one target pixel value; (b) sensing at least one reference pixel of a shading region in the image sensor to generate a calibration value, wherein the reference pixel and the sensing row do not belong to the same row; and (c) referring to the calibration value to calibrate and output the target pixel value.
Claims10
An image calibration method, for calibrating an image sensed by an image sensor including a pixel array having an effective pixel region and a shading region, wherein the effective pixel region includes at least one target pixel and the shading region includes at least one reference pixel, where each row of the pixel array includes at least one of the target pixel and at least one of the reference pixel, comprising:
- (a) sensing at least one of the target pixel to generate at least one target pixel value;
- (b) at a same time point when step (a) is executed, sensing at least one of the reference pixel to generate a calibration value, wherein the reference pixel and the target pixel sensed at the same time point do not belong to the same row, wherein the reference pixel is located in a row N, and the target pixel is located in a row N+X, where X is a non-zero integer having a fixed value and N is a positive integer;
- and
- (c) referring to the calibration value to calibrate and output the target pixel value.
An image processing system, comprising:
- a pixel array, comprising:
- an effective pixel region, including at least one target pixel;
- and
- a shading region, including at least one reference pixel;
- wherein each row of the pixel array includes at least one of the target pixel and at least one of the reference pixel;
- a row sensor, for sensing at least one of the target pixel to generate at least one target pixel value, and at a same time point when sensing the target pixel, sensing at least one of the reference pixel to generate a reference pixel value, wherein the reference pixel and the target pixel sensed at the same time point do not belong to the same row, wherein the reference pixel is located in a row N, and the target pixel is located in a row N+X, where X is a non-zero integer having a fixed value and N is a positive integer;
- and
- a calculating unit, for referring to the reference pixel value to generate a calibration value and for calibrating the target pixel value according to the calibration value.
Dependencies are inferred from the claim text.