CCD imager with many dummy pixels

Details CCD imager with many dummy pixels CCD imager with many dummy pixels

1985-08-27

1987-03-10

Rubinson, Gene Z.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358221, H04N 518, H04N 314

Patent

active

046494308

ABSTRACT:
A CCD imager having one or more serial output shift registers 16, wherein the dark reference area 10 prime at the edge of the image area 10 is located so that it will be clocked into the opposite end 16 prime of the serial shift register 16 from the output amplifier 18. After a line of image information is clocked through the output amplifier 18, the dark reference information is left in dummy pixel area 16 double prime. At the next line transfer, the dark reference information stored in the portion 16 double prime is the first clocked into the output amplifier 18, and thus provides the reference information.
Standard TV formats have a limited amount of time available for horizontal blanking; this time limit, together with the CCD well clock rate, restricts the number of CCD wells which can separate the amplifier from the edge of the array. The present invention permits the amplifier to be located at a greater distance away from the array, because the clock cycles required for the dummy elements 16 double prime are used to load the dark reference information. This is particularly useful when the amplifier 18 is a correlated double sampling amplifier, or another amplifier which takes up a large amount of space.

REFERENCES:
patent: 4237383 (1980-12-01), Kosonocky et al.
patent: 4496982 (1985-01-01), Levine
patent: 4498105 (1985-02-01), Crawshaw
patent: 4513313 (1985-04-01), Kinoshita et al.
patent: 4584656 (1986-04-01), Sakai et al.
patent: 4587563 (1986-05-01), Bendell et al.
patent: 4589025 (1986-05-01), Monahan et al.

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