Method and apparatus employing composite transforms of intermediary image data metrics for achieving imaging device/media compatibility and color appearance matching
US5786823A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 29, 1995 |
| Grant date | Jul 28, 1998 |
| Priority date | — |
| Expiry date | Sep 29, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/6055
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image signal transform mechanism employs one or more composite transforms that convert image bearing-signals corresponding to unrendered input images into output device-associated colorimetry values. Through a first sequence of transformations, the image bearing signals are related to database color encoding values. The database color encoding values incorporate corresponding colorimetric values required to match, in an encoding viewing environment, the appearance of the images in the input viewing environment. Through a second transformation sequence the database color encoding values are transformed into modified colorimetry values in terms of a viewing environment. Through a third transformation sequence, the modified colorimetry values are related to the output device-associated colorimetry values. The at least one composite transform (e.g., a single transform) is representative of plural transformations (all or some) within the first, second and third transformations sequences.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.