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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Vander Haeghen, Y. Naeyeart, J.M. Lemahieu, I. |
| Copyright Year | 1998 |
| Description | Author affiliation: Dept. of Eng., Ghent Univ., Belgium (Vander Haeghen, Y.) |
| Abstract | The authors propose a simple, quick and practical color calibration procedure that results in a precise (reproducible), albeit not very accurate (close to values obtained with a reference device), color description in a standard device-dependent color space (sRGB). The system consists of a 3-chip CCD camera, a continuous ring-light, frame grabber and PC. The calibration procedure involves building a profile of the acquisition system based on 24 color targets with known characteristics. This profile is easily checked before a set of image acquisitions and remains valid for a long period. The acquired images are transformed from the device-dependent RGB camera space to the gamma corrected sRGB (or ITU-R BT.709) space and are readily displayable on a CRT-based monitor. Moreover, sRGB tristimulus values are readily transformed to the CIE L*a*b* space, allowing perceptual color differences (/spl Delta/E/sub ab/*) to be computed. Although the accuracy of the proposed procedure is not very high (/spl Delta/E/sub ab/*>10 for some of the color targets), the precision or reproducibility is quite good. The short-term precision based on 20 consecutive measurements of a white patch is (/spl Delta/E/sub ab/*)=0.04, with /spl Delta/E/sub ab/*<0.1. The medium-term precision, based on 10 measurements of the 24 color patches made during different warm-up cycles of the acquisition system under one profile is (/spl Delta/E/sub ab/*)=0.34, with /spl Delta/E/sub ab/*<1.2. Long-term or inter-profile precision is of the same order, even when the color temperature of the light source is changed between profiles. |
| Starting Page | 944 |
| Ending Page | 949 |
| File Size | 586099 |
| Page Count | 6 |
| File Format | |
| ISBN | 0780351649 |
| ISSN | 1094687X |
| DOI | 10.1109/IEMBS.1998.745599 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 1998-11-01 |
| Publisher Place | China |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Color Skin Calibration Charge coupled devices Charge-coupled image sensors Cameras Monitoring Reproducibility of results Temperature Light sources |
| Content Type | Text |
| Resource Type | Article |
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