Process for estimating the noise level in sequences of images and a device therefor
OwnerAntonio Maria Borneo, Lanfranco Salinariinventors
Life of this patent
Estimating the term…
Abstract
A process for estimating the noise level of a sequence of images comprises the operations of: producing a local estimate of the noise level of the said images, creating the histogram of the said estimate, deriving at least one parameter of the said histogram, and determining, by calculation or by means of an empirical relation, at least one noise level parameter on the basis of the said at least one parameter derived from the histogram. The corresponding device can be incorporated, for example, in an MPEG-2 encoder, where the parameter identifying the noise level is used for the adjustment of the internal variables of the encoding process.
Claims24
A process for estimating the noise level present in a sequence of images, of the process comprising:
- producing a local estimate of the noise level of the images;
- creating a histogram of the local estimate;
- deriving a first parameter from the histogram;
- and
- determining a second parameter indicating the noise level on the basis of the first parameter derived from the histogram.
A device for estimating the level present in a sequence of images, comprising:
- an estimation unit for producing a local estimate of the noise level of the images;
- a unit for generating a histogram of the local estimate;
- a unit for deriving a first parameter from the histogram;
- and
- a processing unit for determining a second parameter indicating the noise level on the basis of the first parameter derived from the histogram.
Dependencies are inferred from the claim text.