System and method for reducing unwanted noise in digital data
AssigneeHewlett-Packard Company
InventorMark Alan Overton
Life of this patent
Estimating the term…
Abstract
A noise reduction system and method for reducing unwanted noise in digital data is disclosed. The system and method includes a noise reduction module having a noise estimation and reduction submodule. The noise estimation and reduction submodule can be any suitable submodule for receiving compressed data, estimating the amount of noise added due to data compression, and using the estimate to reset false gray pixels, thereby producing new data with reduced halos.
Claims31
A method for reducing noise from digital data comprised of data points, each data point having a value, the method comprising:
- estimating the noise by identifying and processing data points outside a valid range that is bounded by a maximum luminance value and a minimum value;
- using the noise estimate and the data point values to postulate noisy data points by selecting a portion of the data points with values near a boundary value of the valid range;
- and
- resetting the postulated data points to a value within the valid range by resetting the selected data points to the boundary value of the valid range.
A computer-readable medium having computer-executable components for reducing noise added by a compressor, comprising:
- a noise estimation component adapted to receive compressor produced decompressed data comprised of data points with values for estimating the amount of noise added by the compressor by defining a peak reference value and computing a peak range based on the peak reference value and defined by a window value and a value within the valid range;
- and
- a filter component for postulating data points erroneously set and using the estimate to reset the values of the postulated data points to a boundary value within a valid range by resetting data points having values within the peak range to a boundary value of the valid range.
A noise filter for reducing noise added by a compressor, comprising:
- a first processor for receiving compressor produced decompressed data comprised of data points with values;
- a second processor for estimating the amount of noise added by the compressor;
- and
- a third processor for postulating data points erroneously set and using the estimate to reset the values of the postulated data points to a boundary value within a valid range.
Dependencies are inferred from the claim text.