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Proceedings Paper

Region-based histogram specification for dynamic range expansion
Author(s): Young Ho Kim; Hyun Suk Jang; Kun Sop Kim; Byung Deok Nam
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Paper Abstract

In this paper, we propose a method of region based histogram specification resulting dynamic range expansion effect. Main goal of this paper is enhancement of the image captured in back light condition, in which the captured image contains tow extremely contrasted regions simultaneously. The proposed method has two steps. The first is region segmentation in the spatial domain by using threshold values derived from the histogram domain. The second step is execution of independent histogram modification for the segmented regions. The histogram modification for each region is similar to typical histogram equalization except the interval to be histogram equalized. The resulting regionally histogram specified image can be obtained by combining the results of the previous steps. The proposed segmentation algorithm has an advantage in computational cost in that it can be performed with simple neighborhood operation by using the thresholding intensity level derived fast from histogram domina. The proposed algorithm shows better result than the typical histogram equalization by referring to specific region of interest to be enhanced.

Paper Details

Date Published: 1 April 1998
PDF: 8 pages
Proc. SPIE 3302, Digital Solid State Cameras: Designs and Applications, (1 April 1998); doi: 10.1117/12.304571
Show Author Affiliations
Young Ho Kim, Samsung Aerospace Industries, Ltd. (South Korea)
Hyun Suk Jang, Samsung Aerospace Industries, Ltd. (South Korea)
Kun Sop Kim, Samsung Aerospace Industries, Ltd. (South Korea)
Byung Deok Nam, Samsung Aerospace Industries, Ltd. (South Korea)

Published in SPIE Proceedings Vol. 3302:
Digital Solid State Cameras: Designs and Applications
George M. Williams Jr., Editor(s)

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