Fast automatic compensation of under/over-exposured image regions

Authors:
Vassilios Vonikakis;Ioannis Andreadis
Affiliations:
Democritus University of Thrace, Department of Electrical and Computer Engineering, Laboratory of Electronics, Section of Electronics and Information Systems Technology, Xanthi, Greece;Democritus University of Thrace, Department of Electrical and Computer Engineering, Laboratory of Electronics, Section of Electronics and Information Systems Technology, Xanthi, Greece
Venue:
PSIVT'07 Proceedings of the 2nd Pacific Rim conference on Advances in image and video technology
Year:
2007

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Abstract

This paper presents a new algorithm for spatially modulated tone mapping in Standard Dynamic Range (SDR) images. The method performs image enhancement by lightening the tones in the under-exposured regions while darkening the tones in the over-exposured, without affecting the correctly exposured ones. The tone mapping function is inspired by the shunting characteristics of the center-surround cells of the Human Visual System (HVS). This function is modulated differently for every pixel, according to its surround. The surround is calculated using a new approach, based on the oriented cells of the HVS, which allows it to adapt its shape to the local contents of the image and, thus, minimize the halo effects. The method has low complexity and can render 1MPixel images in approximately 1 second when executed by a conventional PC.