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Real-time gain correction method using a reference light for an area-parallel-type frame-transfer charge-coupled device with multi-output taps

[+] Author Affiliations
Kohji Mitani

NHK (Japan Broadcasting Corporation), Advanced Television Systems Division, Science & Technical Research Laboratories, 1-10-11 Kinuta, Setagaya-ku, Tokyo 157-8510, Japan

Masayuki Sugawara

NHK (Japan Broadcasting Corporation), Advanced Television Systems Division, Science & Technical Research Laboratories, 1-10-11 Kinuta, Setagaya-ku, Tokyo 157-8510, Japan

Fumio Okano

NHK (Japan Broadcasting Corporation), Advanced Television Systems Division, Science & Technical Research Laboratories, 1-10-11 Kinuta, Setagaya-ku, Tokyo 157-8510, Japan

J. Electron. Imaging. 15(1), 013001 (February 01, 2006). doi:10.1117/1.2155338
History: Received August 31, 2004; Revised July 11, 2005; Accepted July 15, 2005; Published February 01, 2006
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The authors propose a technique for performing real-time correction of the gain nonuniformity at output taps in an area-parallel-type frame transfer CCD (FT-CCD) by incorporating a reference optical signal. This technique activates a reference light source every vertical blanking (V-blanking) period, during which time the image sensor is shielded from incident light, and uses that output signal level to automatically adjust the gain of each block. For this method, a color-separation prism with reference light sources has been developed. In addition, to obtain a reference signal from the reference light source emitting for about 11% of the V-blanking period, a new method of accumulating the electron signal generated by the reference light source is described for the CCD. The results of a camera experiment using an 8-million-pixel CCD are described, and the compensation accuracy of this method is discussed.

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© 2006 SPIE and IS&T

Citation

Kohji Mitani ; Masayuki Sugawara and Fumio Okano
"Real-time gain correction method using a reference light for an area-parallel-type frame-transfer charge-coupled device with multi-output taps", J. Electron. Imaging. 15(1), 013001 (February 01, 2006). ; http://dx.doi.org/10.1117/1.2155338


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