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US 6,307,888 B1Granted
Method for estimating the noise level in a video sequence
AssigneeThomson Licensing
InventorFrançois Le Clerc
Life of this patent
Estimating the term…
Abstract
In noise measurement for video sequences it is difficult to distinguish between picture content and noise. In order to improve the measurement reliability the results of two different noise level computing methods are combined. One computation relies on the analysis of displaced field or frame differences, the other is based on the values of the field or frame differences over static picture areas.
Claims14
Method for estimating the noise level for a current source field or frame of a video sequence, including the following step:
- calculating differences between pixel values of blocks in a previous field or frame and corresponding pixel values of corresponding blocks in a future field or frame, wherein either said previous or said future field or frame can be said current field or frame itself and wherein at least one block of each corresponding couple of blocks
- is a motion-compensated pixel block or
- is mapped to the other block by an associated motion vector estimate;
- and
- translating the detected distribution of pixel difference values of a block into a noise level estimate using a predetermined noise model.
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Dependencies are inferred from the claim text.