A single-camera high dynamic range technique by using contrast enhancement and exposure control

Abstract

This paper presents a single-camera HDR imaging algorithm, which is able to solve all the extreme conditions by controlling the exposure time to get a well-exposed image and then enhancing it. The proposed system is divided into two parts, i.e. single-image HDR imaging technique and an exposure control method. The single-image HDR imaging technique integrates two methods, i.e. Dynamic Local Contrast Enhancement (DLCE) and fuzzy enhancement. The integrated result can handle both glaring region and dark region to exhibit good visibility for extreme conditions. In exposure control method, we utilize local average, camera response function and main object detection to achieve a well-exposed image. Finally, we implement our system on TI OMAP4430 embedded platform. The optimized program is able to achieve about 13 frames per second with VGA resolution. A. Dynamic Local Contrast Enhancement (DLCE)

Analysis of Image Enhancement Methods for Outdoor-Applications

“…To prevent pictures with not trustworthy information a lot of algorithms for digital image processing and contrast enhancement have been proposed [7]- [11]. Especially automotive suppliers are very interested in video cameras which can cope with varying lightning conditions.…”