Smear reduction in CCD images

Details Smear reduction in CCD images Smear reduction in CCD images

2004-07-21

2010-10-05

Aggarwal, Yogesh K (Department: 2622)

Television

Camera, system and detail

Solid-state image sensor

C348S295000, C348S296000, C348S297000, C348S312000

Reexamination Certificate

active

07808534

ABSTRACT:
Vertical and horizontal smear in images produced by a CCD imager can be compensated for by detecting the boundaries of the smear and substituting data from an alternative part of the image, or interpolated data within those boundaries. Vertical, or frame transfer, smear can also be compensated for by producing an error signal from charge accumulated during frame transfer and corresponding to one or more masked rows of the CCD imager. This error signal can be subtracted from the line signals corresponding to each row of the CCD images receiving radiation during image acquisitions. The CCD imager includes a multiplication register. The dynamic range of the imager may be extended by varying the gain of the multiplication register, for example on a line-by-line or frame-by-frame basis.

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Mylonas S. et al., “Adaptive Noise Canceling and Edge Detection In Images Using PVM on a NOW”, 10th Mediterranean Electrotechnical Conference, vol. 2, May 29, 2000, pp. 681-684.
British Search Report dated Nov. 18, 2003 issued in GB 0316994.3.

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