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

Kohji Mitani; Masayuki Sugawara; Fumio Okano

doi:10.1117/1.2155338

1 January 2006 Real-time gain correction method using a reference light for an area-parallel-type frame-transfer charge-coupled device with multi-output taps

Kohji Mitani, Masayuki Sugawara, Fumio Okano

Author Affiliations +

Journal of Electronic Imaging, Vol. 15, Issue 1, 013001 (January 2006). https://doi.org/10.1117/1.2155338

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.

©(2006) Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation Download 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," Journal of Electronic Imaging 15(1), 013001 (1 January 2006). https://doi.org/10.1117/1.2155338

Published: 1 January 2006

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KEYWORDS

Charge-coupled devices

Image sensors

Sensors

Light sources

Cameras

Prisms

Light emitting diodes

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