Signal restoration and gain control for image viewing devices

Details Signal restoration and gain control for image viewing devices Signal restoration and gain control for image viewing devices

H - Electricity

04

N

350/54

H04N 1/40 (2006.01) H04N 3/15 (2006.01) H04N 5/217 (2006.01) H04N 5/335 (2006.01)

Patent

CA 1132244

- 1 - ABSTRACT OF THE DISCLOSURE A system for restoring image signal levels and setting signal gain for charge coupled imaging devices (CCDs). Following the last image signal or pixel in a line of image data, a predetermined sequence of dark level signals (D) and light level signals (L) are shifted out of the CCD. The dark level signals are the absence of all image information, while the light level signals represent signals introduced at the appropriate time early in the shifting cycle. At the CCD output, the dark and light level signals are isolated and processed by an MPU in accordance with pre-established functions to provide an offset potential and gain multiplicand. The offset poten- tial and gain multiplicand determined are used to remove the offset and set signal gain for the next succeeding line of image signals. The process is repeated as each line of image signals are output from the CCD.

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