tailieunhanh - Báo cáo hóa học: " Efficiency analysis of color image filtering"

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: Efficiency analysis of color image filtering | Fevralev et al. EURASIP Journal on Advances in Signal Processing 2011 2011 41 http content 2011 1 41 o EURASIP Journal on Advances in Signal Processing a SpringerOpen Journal RESEARCH Open Access Efficiency analysis of color image filtering Dmitriy V Fevralev 1 Nikolay N Ponomarenko1 Vladimir V Lukin1 Sergey K Abramov1 Karen O Egiazarian2 and Jaakko T Astola2 Abstract This article addresses under which conditions filtering can visibly improve the image quality. The key points are the following. First we analyze filtering efficiency for 25 test images from the color image database TID2008. This database allows assessing filter efficiency for images corrupted by different noise types for several levels of noise variance. Second the limit of filtering efficiency is determined for independent and identically distributed . additive noise and compared to the output mean square error of state-of-the-art filters. Third component-wise and vector denoising is studied where the latter approach is demonstrated to be more efficient. Fourth using of modern visual quality metrics we determine that for which levels of . and spatially correlated noise the noise in original images or residual noise and distortions because of filtering in output images are practically invisible. We also demonstrate that it is possible to roughly estimate whether or not the visual quality can clearly be improved by filtering. Keywords image filtering filter efficiency quality metrics color image database 1. Introduction A huge amount of color images is acquired nowadays by professional and consumer digital cameras mobile phones remote sensing systems etc. and used for various purposes 1-5 . A large percentage of these images are of appropriate quality and need no processing for enhancement. However there are quite many images which are degraded. One of the main factors affe cting color image quality is the noise that might be of different types and have various .

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