Black pattern correction for charge transfer sensor

Details Black pattern correction for charge transfer sensor Black pattern correction for charge transfer sensor

1997-12-22

2000-11-07

Flynn, Nathan

Television

Camera, system and detail

Combined image signal generator and general image signal...

348243, 348245, 348251, H04N 964

Patent

active

061444081

ABSTRACT:
An electronic imaging device employs black pattern correction for dark current in a charge transfer image sensor. The sensor is composed of image pixels having a characteristic black pattern of dark current in which the amplitude of the dark current for each pixel is dependent upon exposure time. A reference dark frame exposure is captured from the image sensor in the absence of light and dark frame pixel values are obtained. An exposure section regulates the exposure time of image light upon the image sensor and provides a corresponding plurality of image frame exposures; the image sensor thus generates a corresponding plurality of image frames each comprised of image frame pixel values. A processor then generates a correction factor from the dark frame pixel values and applies the correction factor to the image frame pixel values for the plurality of image frames to obtain corrected image frame pixel values that are modified for the black pattern. As a result, performance efficiency is increased by using a single reference dark frame exposure in the correction of many image frame exposures.

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