Method and apparatus for representing image granularity by one or more parameters
AssigneeThomson Licensing
InventorsCristina Gomila, Alexander Kobilansky
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Abstract
To simulate film grain in a compressed video signal, a decoder (15, 28) receives a message containing information that contains a set of one or more parameters, each specifying certain attribute associated with the film grain. For example, one of the parameters will specify the model used to simulate the film grain, whereas other parameters each specify a particular factor associated with that model. Upon receipt of the message, the decoder selects the model, and simulates the film grain for addition to the video signal following decompression.
Claims22
A method for simulating film grain comprising the steps of:
- receiving image information representative of an image from which film grain has been at least attenuated;
- receiving film grain information that includes at least one parameter among a set of possible parameters specifying different attributes of the film grain previously in the image;
- selecting a model for simulating grain;
- simulating the film grain in accordance with the selected model and the at least one parameter;
- and
- merging the simulated film grain into the image.
Apparatus for simulating film grain, comprising:
- first means for:
- (1) receiving image information representing an image from which film grain has been substantially attenuated;
- (2) receiving film grain information that includes at least one parameter among a set of possible parameters specifying different attributes of the film grain;
- (3) selecting a model for simulating grain;
- and (4) simulating the film grain in accordance with the selected model and the at least one parameter;
- and
- second means for merging the simulated film grain with the image.
Dependencies are inferred from the claim text.