Dynamic offset to increase the range of digitization of...

H - Electricity – 04 – N

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H04N 5/06 (2006.01) H04N 5/14 (2006.01) H04N 5/217 (2006.01) H04N 5/30 (2006.01) H04N 7/18 (2006.01) H04N 5/33 (2006.01) H04N 7/13 (1990.01)

Patent

CA 2078005

2078005 9212596 PCTABS00014 The assembly (10) utilizes real-time imaging for detecting radiation from an object field (12) which has a component which is periodic in time. A video camera (14) detects emitted and reflected radiation from the object field (12) and produces a video signal comprising a series of pixels representing a frame of the image. A dynamically averaged offset derived from the original video signal is subtracted from the video signal leaving only information from the time-varying component of the video object field. The resulting signal is digitized by a digitizer (18) contained in a processor (16). The processor (16) averages the successive frames as synchronous images based on the periodicity of the object field (12) to eliminate unsynchronous noise from the image and to display an image synchronous with the periodicity of the object field (12). Because the final video image is a digitization of the amplified difference, the dynamic range of the corrected image is greatly increased.

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