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US 8,797,426 B2Granted
Method of image noise reduction
AssigneeZakrytoe Akcionernoe Obshchestvo "Impul's"
InventorAleksey Anatol'evich Borisov
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Abstract
A method of noise reduction in an image obtained with the use of TV camera comprising a generation of a frame video flow out of frame groups, having timing interdependency; a generation of an image out of output frame series obtained by means of processing of the said frame groups by the use of averaging closely adjacent pixel values in at least one group of frames; and the use of average values considering weight coefficients to form an output frame.
Claims6
A method of reducing noise in a video produced using a TV camera, the method comprising
- generating in a video channel a video flow with at least one video frame group, the at least one video frame group comprising an odd number of 2N+1 video frames having time interdependence,
- wherein N is ≧1, and
- wherein the video frame to be processed for reducing noise to produce an output video frame is a middle video frame in the at least one video frame group, and wherein remaining video frames in the at least one video frame group are N pairs of video frames juxtaposed time-symmetrically with respect to the middle video frame;
- determining a pixel value of a corresponding pixel positioned in each of the 2N+1 video frames;
- calculating for each pair of video frames an average pixel value for corresponding pixels positioned in the video frames of the pair;
- calculating for each pair of video frames an absolute value of a difference between the calculated average pixel value and the determined pixel value of a corresponding pixel in the middle frame,
- calculating for each video frame of each pair an absolute value of a difference between the determined pixel value of a corresponding pixel positioned in a pair of video frames and the determined pixel value of a corresponding pixel positioned in the middle video frame;
- determining a minimal of all said absolute values;
- and
- selecting a pixel value for a corresponding pixel in the output frame as a weighted pixel value corresponding to the determined minimal absolute value.
7 more elements
Dependencies are inferred from the claim text.