Noise reduction circuit and image processing device
US8165420B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 19, 2007 |
| Grant date | Apr 24, 2012 |
| Priority date | — |
| Expiry date | Feb 21, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/20021
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A representative-value calculator calculates a representative value of signal values of pixels included in each of divided regions of a neighboring region of a pixel of interest. The divided regions are obtained by dividing the neighboring region into the predetermined number of divisions. The number of divisions is determined based on a frequency band in an input image signal. A difference-absolute-value calculator calculates a difference absolute value between a signal value of the pixel of interest and each of the representative values of the respective divided regions. A weight calculator calculates a weight for each of the representative values of the respective divided regions according to the difference absolute value. A normalization processor normalizes the sum of products of the representative values of the respective divided regions and the weights for the representative values of the respective divided region.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.