Defect correction for ccd and cid imagers

Details Defect correction for ccd and cid imagers Defect correction for ccd and cid imagers

H - Electricity

04

N

354/127

H04N 5/217 (2006.01)

Patent

CA 2038914

7615 Title: DEFECT CORRECTION FOR CCD AND CID IMAGERS ABSTRACT OF THE INVENTION: A defect correction apparatus for a solid state imaging device employs a frame buffer responsively coupled to the imaging device for storing digital values of shuttered dark pixel data from image locations of the imaging device. A register responsively coupled to the imaging device and having an output coupled to the frame buffer sequentially clocks digital values of image pixel data of the imaging device into the frame buffer. A comparator having an output operatively coupled to the register and being responsively coupled to the dark pixel data of the frame buffer produces enable and inhibit outputs. When any selected element of dark pixel data is less than a threshold, indicative of an operative pixel element in the imaging device, data stored in the register corresponding to the pixel is stored in the frame buffer in response to the enable signal. When the value of the dark pixel data in the frame buffer is greater than the threshold the comparator produces all inhibit signal. The value of image data of a previous operative pixel element is thereby entered into the register and frame buffer.

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