Technique for simulating film grain on encoded video
AssigneeThomson Licensing
InventorsCristina Gomila, Jill Boyce
Life of this patent
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Abstract
Simulating film grain in an encoded image occurs by extracting the film grain and then characterizing the film grain for encoding in a video stream to enable the film grain restoration upon decoding. Typically, the film grain is characterized based either on the type of film, or by using a particular model. In practice, the film grain particulars are transmitted as parallel information to the video coded stream, typically as a film grain Supplemental Enhancement Information (SEI) message when using the ITU T H.264 video coding standard.
Claims21
A method for simulating film grain, comprising the steps of:
- receiving an encoded image
- receiving film grain characterization information indicative of grain in a film on which the encoded image was originally recorded,
- decoding at least the encoded image;
- simulating a pattern of film grain in accordance with the received film grain characterization information;
- and
- blending the simulated film grain pattern with the decoded image.
A method for simulating film grain, comprising the steps of:
- encoding an image originally recorded on film;
- identifying the film grain present in the input image;
- and
- establishing film grain characterization information for the film in accordance with a predefined modeling process so that upon decoding the encoding image, a pattern of film grain can be simulated in accordance with the film grain characterization information and blended with the decoded image.
Apparatus for simulating film grain in an image, comprising of:
- a decoder for receiving an encoded image and for receiving film grain characterization information indicative of grain in a film on which the encoded image was originally recorded and for decoding the image;
- and
- a film grain restoration processor for simulating a pattern of film grain in accordance with the received film grain parameter information;
- and for blending the simulated film grain pattern to the decoded image.
Dependencies are inferred from the claim text.