Method for mismatch detection between the frequency of...

Details Method for mismatch detection between the frequency of... Method for mismatch detection between the frequency of...

2006-11-28

2006-11-28

Vu, Ngoc-Yen (Department: 2622)

Television

Camera, system and detail

Combined image signal generator and general image signal...

C348S308000

Reexamination Certificate

active

07142234

ABSTRACT:
A method for achieving flickerless operation of imagers using a rolling shutter, including the steps of detecting flicker in an image frame and adjusting an integration time such that the integration time is an integer multiple of a light intensity period, is described. The method reduces the task of detecting flicker to detecting a spatial sine wave in the image frame by subtracting two image frames from each other. The subtraction reduces or eliminates image content from the image frames and makes the detection process independent of image content. This method can be practiced based on a very short sequence of image frames (as few as two image frames) and is virtually insusceptible to motion of the image content. Adjustments to the integration time are made by changing the horizontal blanking time of the imager and, thereby extending the duration time of each row of said image frame.

REFERENCES:
patent: 2003/0067546 (2003-04-01), Asano
patent: 2004/0201729 (2004-10-01), Poplin et al.

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