Image-dependent sharpness enhancement
US5363209A · kind A · utility
175Cited by
6References
40Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 5, 1993 |
| Grant date | Nov 8, 1994 |
| Priority date | — |
| Expiry date | Nov 5, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/58
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of altering the sharpness in the reproduction of an electronically encoded natural scene image, including process steps of: a) converting the signals to a luminance-chrominance signal format, wherein at least one signal represents overall image intensity; b) determining the maximum local contrast within the image; c) determining a filter function applicable to the image which increases maximum local contrast to a predetermined target value, and all other contrast to an amount proportional thereto; and d) applying the determined filter function to the image to increase sharpness thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.