Detecting errors in video images
First Claim
Patent Images
1. A method of detecting an error in a signal representing a video image, said method comprising:
- receiving blocks of frequency related coefficients representing respective blocks of the image; and
analyzing the statistical distribution of said coefficients within a block to detect the presence of corrupted data.
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Abstract
An error is identified in a video image by calculating frequency-related coefficients for blocks of the image and considering the statistical distribution of said coefficients. The variance of the coefficients is calculated and a block of original image data is concealed if the variance calculated is significantly higher than a stored threshold and/or if said variance calculated is significantly different from variance values derived for similarly positioned blocks within a previous frame. Concealment is effected by selecting image data from a previous frame, displaced in response to transmitted motion vectors.
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13 Claims
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1. A method of detecting an error in a signal representing a video image, said method comprising:
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receiving blocks of frequency related coefficients representing respective blocks of the image; and analyzing the statistical distribution of said coefficients within a block to detect the presence of corrupted data. - View Dependent Claims (2, 3, 4, 5)
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6. Apparatus for identifying the presence of an error in a signal representing a video image, said apparatus comprising:
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means for receiving blocks of frequency related coefficients representing respective blocks of the image; and means for analysing the statistical distribution of said frequency related coefficients representing respective blocks of the image to identify corrupted data. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13)
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Specification