Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1990-05-24
1991-09-10
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Recording apparatus
35821317, H04N 314
Patent
active
050478630
ABSTRACT:
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 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 an 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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Pape David D.
Reiss Wanda T.
Britton Howard W.
Greening Wendy R.
Polaroid Corporation
Roman Edward S.
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