Interactive dynamic range adjustment system for printing digital images
US5012333A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 5, 1989 |
| Grant date | Apr 30, 1991 |
| Priority date | — |
| Expiry date | Jan 5, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/6011
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An interactive dynamic range adjustment method for printing digital images, and an implementation system, are disclosed. The method is based on experimental findings about visual photoreceptor adaption and human visual contrast sensitivity. The system adjusts the contrast of the low-frequency component only of the image, preserving (or if one wishes, enhancing) the high-frequency image component in its contrast. The adjustment is controlled by a mapping curve which the user manipulates interactively. The simulated optical print image and the dynamic range adjusted image are displayed side by side on a monitor screen so that the user can make proper selection of parameters to achieve the desired effect. For many images, the system automatically computes good parameters and no further adjustment is needed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.