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http://dx.doi.org/10.7840/kics.2013.38A.8.669

Enhanced High Contrast Image Rendering Method Using Visual Properties for Sharpness Perception  

Lee, Geun-Young (경북대학교 대학원 전자공학부, 오디오 비디오 신호처리 및 자동차 전자공학 연구실)
Lee, Sung-Hak (경북대학교 IT대학 전자공학부)
Kwon, Hyuk-Ju (경북대학교 대학원 전자공학부, 오디오 비디오 신호처리 및 자동차 전자공학 연구실)
Sohng, Kyu-Ik (경북대학교 IT대학 전자공학부, 오디오 비디오 신호처리 및 자동차 전자공학 연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.38A, no.8, 2013 , pp. 669-679 More about this Journal
Abstract
When an image is converted from HDR (high dynamic range) to LDR (low dynamic range), a tone mapping process is the essential component. Many TMOs (tone mapping operators) have been motivated by human vision which has lower physical luminance range than that in real scene. The representative of human vision properties which motivate TMOs is the local adaptation. However, TMOs are ultimately compressing image information such as contrast, saturation, etc. and the compression causes defects in image quality. In this paper, in order to compensate the degradation of the image which is caused by TMOs, the visual acuity-based edge stop function is proposed for applying the property of human vision to base-detail separation. In addition, using CSF (contrast sensitivity function) which represents the relationship among spatial frequency, contrast sensitivity, and luminance, the sharpness filter is designed and adaptively applied to the detail layer in regard to surround luminance.
Keywords
High dynamic range; Band Separation; Human visual system; Visual acuity; Contrast sensitivity function;
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