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Journal of Electronic Imaging

Real-time gain correction method using a reference light for an area-parallel-type frame-transfer charge-coupled device with multi-output taps
Author(s): Kohji Mitani; Masayuki Sugawara; Fumio Okano
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Paper Abstract

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.

Paper Details

Date Published: 1 January 2006
PDF: 8 pages
J. Electron. Imag. 15(1) 013001 doi: 10.1117/1.2155338
Published in: Journal of Electronic Imaging Volume 15, Issue 1
Show Author Affiliations
Kohji Mitani, NHK Science & Technical Research Labs. (Japan)
Masayuki Sugawara, Japan Broadcasting Corp. (Japan)
Fumio Okano, NHK Science & Technical Research Labs. (Japan)

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