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Performance evaluation of mail-scanning cameras

[+] Author Affiliations
Umesh Rajashekar

The University of Texas at Austin, Department of Electrical and Computer Engineering, Laboratory for Image and Video Engineering, 1 University Station C0803, Austin, Texas 78712-0240

Tony Tuan Vu

Autim, Inc., 4001 Kennett Pike, Suite 134-245, Greenville, Delaware 19807

John E. Hooning

Autim, Inc., 4001 Kennett Pike, Suite 134-245, Greenville, Delaware 19807

Alan Conrad Bovik

The University of Texas at Austin, Department of Electrical and Computer Engineering, Laboratory for Image and Video Engineering, 1 University Station C0803, Austin, Texas 78712-0240

J. Electron. Imaging. 19(2), 023008 (May 11, 2010). doi:10.1117/1.3421975
History: Received November 03, 2009; Revised March 10, 2010; Accepted March 23, 2010; Published May 11, 2010; Online May 11, 2010
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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.

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© 2010 SPIE and IS&T

Citation

Umesh Rajashekar ; Tony Tuan Vu ; John E. Hooning and Alan Conrad Bovik
"Performance evaluation of mail-scanning cameras", J. Electron. Imaging. 19(2), 023008 (May 11, 2010). ; http://dx.doi.org/10.1117/1.3421975


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