Method and system for reducing correlated noise in image data
AssigneeVarian Medical Systems, Inc.
InventorsIvan P. Mollov, Richard E. Colbeth, Christopher Webb, Jiann M. Yu
Life of this patent
Estimating the term…
Abstract
A method and system for reducing correlated noise in imagers is disclosed. Methods are described for determining a pixel correction value. Correlated noise in data generated by imagers can be reduced by applying the pixel correction value to adjust image data before being displayed.
Claims40
A method for reducing correlated noise in image data, comprising:
- receiving a set of correlated data from an imaging device, the set of correlated data corresponding to a set of two or more correlated image pixels for a present image frame;
- determining a composite value for the set of correlated data;
- receiving a prior composite value corresponding to the set of two or more correlated image pixels from a prior image frame;
- determining a new filtered composite value for the set of two or more correlated image pixels for the present image frame;
- determining a pixel correction value based upon the new filtered composite value for the set of two or more correlated image pixels for the present image frame;
- and
- applying the pixel correction value to the set of correlated data to reduce correlated noise in the set of two or more image pixels for the present image frame.
A system for reducing correlated noise in image data, comprising:
- an input for receiving a set of correlated data from an imaging device, the set of correlated data corresponding to a set of two or more correlated image pixels for a present image frame;
- a memory, the memory configurable to store a prior composite value corresponding to the set of two or more correlated image pixels from a prior image frame, the memory configurable to store a new filtered composite value for the set of two or more correlated image pixels for the present image frame;
- and
- a noise reduction processing module comprising a processor component that is configured to generate a composite value for the set of correlated data, configured to generate the new filtered composite value, and configured to generate a pixel correction value based upon the new filtered composite value for the set of two or more correlated image pixels for the present image frame;
- and
- an output to output an adjusted set of the correlated data based upon the pixel correction value.
A computer program product that includes a medium usable by a processor, the medium having stored thereon a sequence of instructions which, when executed by the processor, causes the processor to execute a process for reducing correlated noise in image data, the process comprising:
- receiving a set of correlated data from an imaging device, the set of correlated data corresponding to a set of two or more correlated image pixels for a present image frame;
- determining a composite value for the set of correlated data;
- receiving a prior composite value corresponding to the set of two or more correlated image pixels from a prior image frame;
- determining a new filtered composite value for the set of two or more correlated image pixels for the present image frame;
- determining a pixel correction value based upon the new filtered composite value for the set of two or more correlated image pixels for the present image frame;
- and
- applying the pixel correction value to the set of correlated data to reduce correlated noise in the set of two or more image pixels for the present image frame.
Dependencies are inferred from the claim text.