Region-based histogram specification for dynamic range expansion

Young Ho Kim; Hyun Suk Jang; Kun Sop Kim; Byung Deok Nam

doi:10.1117/12.304571

1 April 1998 Region-based histogram specification for dynamic range expansion

Young Ho Kim, Hyun Suk Jang, Kun Sop Kim, Byung Deok Nam

Proceedings Volume 3302, Digital Solid State Cameras: Designs and Applications; (1998) https://doi.org/10.1117/12.304571
Event: Photonics West '98 Electronic Imaging, 1998, San Jose, CA, United States

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.

Citation Download Citation

Young Ho Kim, Hyun Suk Jang, Kun Sop Kim, and Byung Deok Nam "Region-based histogram specification for dynamic range expansion", Proc. SPIE 3302, Digital Solid State Cameras: Designs and Applications, (1 April 1998); https://doi.org/10.1117/12.304571

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