Ghost-free high-dynamic range imaging using layered exposed images based on local histogram equalization

Jaehyun Im; Hyuncheol Kim; Taekyung Kim; Sanghoon Lee; Jongsue Bae; Joonki Paik

doi:10.1117/12.920589

7 May 2012 Ghost-free high-dynamic range imaging using layered exposed images based on local histogram equalization

Jaehyun Im, Hyuncheol Kim, Taekyung Kim, Sanghoon Lee, Jongsue Bae, Joonki Paik

Proceedings Volume 8399, Visual Information Processing XXI; 83990I (2012) https://doi.org/10.1117/12.920589
Event: SPIE Defense, Security, and Sensing, 2012, Baltimore, Maryland, United States

Abstract

In this paper, we present a novel high dynamic range (HDR) imaging method using a single input image. Conventional multiple image-based HDR methods are successful only on condition that there is no motion in the scene during the acquisition of multiple, differently exposed low dynamic range (LDR) images. If these constraints are not satisfied, a ghost artifact is produced in the resulting HDR image. In order to overcome these limitations, we generate multiple, differently exposed LDR images from a single input image. We call these multiple images a set of layered exposed (LE) images. In order to generate an appropriate set of LE images, the proposed method divides input image into 9 subregions and computes local mean in each subregion to estimate the minimum and maximum local mean. The estimated local means become ranges of histogram equalization (HE). HDR image is generated by fusing differently exposed LE images. More specifically, given a set of LE images, we perform weighted fusion to produce the resulting HDR image, which is inherently free from ghost artifacts since all LE images are geometrically identical. Experimental results show that the proposed method outperforms the existing algorithms in the sense of both removing ghost artifacts and enhancement of image contrast.

Citation Download Citation

Jaehyun Im, Hyuncheol Kim, Taekyung Kim, Sanghoon Lee, Jongsue Bae, and Joonki Paik "Ghost-free high-dynamic range imaging using layered exposed images based on local histogram equalization", Proc. SPIE 8399, Visual Information Processing XXI, 83990I (7 May 2012); https://doi.org/10.1117/12.920589

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