Offset, gain and bad pixel correction in electronic scanning arr

Details Offset, gain and bad pixel correction in electronic scanning arr Offset, gain and bad pixel correction in electronic scanning arr

1988-07-08

1990-04-24

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358163, 35821315, 35821316, 35821317, 35821318, H04N 140

Patent

active

049204289

ABSTRACT:
Method and apparatus to increase the range of correction of photosite offset and gain response. Each photosite is provided with a correction value for offset and gain response based on measured light intensity value, which is stored in memory. Each photosite correction value is also provided with an attribute value which indicates whether the correction values are to be used as stored, whether a shift of the values is appropriate, in accordance with a stored shift value, or whether the photosite is noncorrectable, and accordingly requires the implementation of a bad pixel routine. Depending on the attribute value, logic is enabled to vary the correction values in accordance with a stored routine for shifting the stored correction value, or implementing a bad pixel routine. If the attribute requires a shifted value, the correction value is shifted a number of places in accordance with a shift stored in the decoder, before it is applied. If the attribute indicates that the photosite response is not correctable, a bad pixel correction routine is enabled, to produce substitute data.

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