Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Video Enhancement Using Adaptive Spatio-Temporal Connective Filter and Piecewise Mapping | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2008 Article ID 165792 13 pages doi 2008 165792 Research Article Video Enhancement Using Adaptive Spatio-Temporal Connective Filter and Piecewise Mapping Chao Wang Li-Feng Sun Bo Yang Yi-Ming liu and Shi-Qiang Yang Department of Computer Science and Technology Tsinghua University Beijing 100084 China Correspondence should be addressed to Chao Wang w-c05@ Received 28 August 2007 Accepted 3 April 2008 Recommended by Bernard Besserer This paper presents a novel video enhancement system based on an adaptive spatio-temporal connective ASTC noise filter and an adaptive piecewise mapping function APMF . For ill-exposed videos or those with much noise we first introduce a novel local image statistic to identify impulse noise pixels and then incorporate it into the classical bilateral filter to form ASTC aiming to reduce the mixture of the most two common types of noises Gaussian and impulse noises in spatial and temporal directions. After noise removal we enhance the video contrast with APMF based on the statistical information of frame segmentation results. The experiment results demonstrate that for diverse low-quality videos corrupted by mixed noise underexposure overexposure or any mixture of the above the proposed system can automatically produce satisfactory results. Copyright 2008 Chao Wang et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. INTRODUCTION Driven by rapid development of digital devices camcorders and cameras are no longer used only for professional work but step into a variety of application areas such as surveillance and home video making. While capturing videos become much easier video defects such as blocking blur noises and contrast distortions are often introduced by
