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Journal of Electronic Imaging

Performance evaluation of mail-scanning cameras
Author(s): Umesh Rajashekar; Tony Vu; John E. Hooning; Alan Conrad Bovik
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Paper Abstract

Letter-scanning cameras (LSCs) form the front- end imaging systems for virtually all mail-scanning systems that are currently used to automatically sort mail products. As with any vision-dependent technology, the quality of the images generated by the camera is fundamental to the overall performance of the system. We present novel techniques for objective evaluation of LSCs using comparative imaging-a technique that involves measuring the fidelity of target images produced by a camera with reference to an image of the same target captured at very high quality. Such a framework provides a unique opportunity to directly quantify the camera's ability to capture real-world targets, such as handwritten and printed text. Noncomparative techniques were also used to measure properties such as the camera's modulation transfer function, dynamic range, and signal-to-noise ratio. To simulate real-world imaging conditions, application-specific test samples were designed using actual mail product materials.

Paper Details

Date Published: 1 April 2010
PDF: 10 pages
J. Electron. Imag. 19(2) 023008 doi: 10.1117/1.3421975
Published in: Journal of Electronic Imaging Volume 19, Issue 2
Show Author Affiliations
Umesh Rajashekar, New York Univ. (United States)
Tony Vu, Autim, Inc. (United States)
John E. Hooning, Autim, Inc. (United States)
Alan Conrad Bovik, The Univ. of Texas at Austin (United States)

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