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Proceedings Paper

Dynamic exposure control in color scanners
Author(s): Giordano B. Beretta
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Paper Abstract

The lightness values of white papers cover an approximate range of fifteen jnd. The tone range of scanners is adjusted for the lightest possible substrate. Therefore, a scan is usually preceded by a preview operation in which the image is subsampled and the data is analyzed to determine the actual tone range. In color facsimile and sheet-fed scanners that do not buffer the entire image, such an operation is not possible. We present a technique in which statistical methods are used to estimate the tone level of the paper. This estimate is used to set the parameters for a tone reproduction curve. The technique is incremental, the statistical data is gathered during the scan. While the scan progresses. The estimate is refined based on the increased amount of data available from the accumulated histogram. This has also the advantage that artifacts due to lamp warming during slow scans are automatically compensated.

Paper Details

Date Published: 4 April 1997
PDF: 13 pages
Proc. SPIE 3018, Color Imaging: Device-Independent Color, Color Hard Copy, and Graphic Arts II, (4 April 1997); doi: 10.1117/12.271623
Show Author Affiliations
Giordano B. Beretta, Hewlett-Packard Labs. (United States)

Published in SPIE Proceedings Vol. 3018:
Color Imaging: Device-Independent Color, Color Hard Copy, and Graphic Arts II
Giordano B. Beretta; Reiner Eschbach, Editor(s)

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