Detection of Gaussian noise in video signals
First Claim
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1. A method of detecting Gaussian noise in a video signal comprising the steps of:
- finding best qualified blocks in an image of the video signal that are substantially uniform in luminance;
calculating an average standard deviation for the best qualified blocks;
temporally filtering the average standard deviation over other images of the video signal to obtain a smoothed average standard deviation; and
calibrating the smoothed average standard deviation into a scale of corresponding input noise levels to obtain the Gaussian noise in the video signal.
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Abstract
A method and apparatus for the detection of Gaussian noise in a video signal decomposes an image from the video signal to obtain best qualified blocks having a relatively uniform luminance. From the best qualified blocks an average standard deviation is calculated, and then smoothed by temporal filtering. The filtered average standard deviation is finally calibrated against a scale of corresponding input noise levels to obtain the Gaussian noise in the video signal.
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Citations
4 Claims
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1. A method of detecting Gaussian noise in a video signal comprising the steps of:
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finding best qualified blocks in an image of the video signal that are substantially uniform in luminance;
calculating an average standard deviation for the best qualified blocks;
temporally filtering the average standard deviation over other images of the video signal to obtain a smoothed average standard deviation; and
calibrating the smoothed average standard deviation into a scale of corresponding input noise levels to obtain the Gaussian noise in the video signal. - View Dependent Claims (2, 3, 4)
subjecting a luminance bit-map of an image to a spatial decomposition to find a significant number of flat blocks; and
applying local variance and local luminance criteria to the flat blocks to chose a set of representative flat blocks as the best qualified blocks.
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3. The method as recited in claim 2 wherein the finding step further comprises the step of selecting from the representative flat blocks a subset of representative flat blocks as the best qualified blocks.
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4. The method as recited in claims 1, 2 or 3 wherein the best qualified blocks have an overall size no smaller than a specified minimum.
Specification
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Current AssigneeProject Giants, LLC
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Original AssigneeTektronix Incorporated (Fortive Corp.)
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InventorsLi, Bei, Janko, Bozidar
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Primary Examiner(s)Kostak, Victor R.
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Application NumberUS09/457,411Time in Patent Office980 DaysField of Search348/180, 348/192, 348/607, 348/615, 348/618, 348/200, 382/224, 382/228, 382/260, 382/262, 382/274, 382/275US Class Current348/180CPC Class CodesH04N 17/00 Diagnosis, testing or measu...
