Adjusting film grain properties in digital images
AssigneeEastman Kodak Company
InventorsRobert T. Gray, David R. Cok
Life of this patent
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Abstract
A method is disclosed of operating on a stored digital image produced by scanning the photographic element to smooth film-grain noise. The method includes extracting and storing a set of statistics of the grain pattern of the film type carrying the image, such statistics being representative of local, spatial, and spectral properties of a photographic grain pattern of that type of film; and using the stored set of statistics to operate upon the stored digital image to change such stored digital image so as to smooth film-grain noise when an image is produced.
Claims16
A method of operating on a stored digital image produced by scanning a photographic element to smooth film-grain noise, comprising the steps of:
- a) extracting and storing a set of statistics representative of local spatial and local spectral properties of a photographic grain pattern of the film carrying the image and for a condition of a scanner used with that film;
- and
- b) using the stored set of statistics to operate upon the stored digital image to change such stored digital image so as to smooth film-grain noise when an image is produced.
A method of reducing the effects of film grain noise from a scanned photographic film image, comprising the steps of:
- a) scanning the film image to produce a digital image;
- b) extracting and storing a set of statistics representative of local spatial and local spectral properties of a photographic grain pattern of the film carrying the image for a scanner condition;
- and
- c) reducing the effects of film grain noise in such scanned image by using such stored statistics.
A method of simulating the effects of film grain noise in a digital image, comprising the steps of:
- a) extracting and storing a set of statistics representative of local spatial and local spectral properties of a photographic grain pattern of the film as scanned using a specified set of scanner conditions;
- and
- b) simulating the effects of film grain noise in such digital image by using such stored statistics whereby such simulated film grain noise digital image is adapted for use in producing an image with film grain noise.
Dependencies are inferred from the claim text.