標題: A CELL-BASED MATTING LAPLACIAN FOR CONTRAST ENHANCEMENT
作者: Tseng, Chen-Yu
Wang, Sheng-Jyh
電子工程學系及電子研究所
Department of Electronics Engineering and Institute of Electronics
關鍵字: contrast enhancement;gamma adjustment;matting Laplacian
公開日期: 2012
摘要: While various kinds of local tone mapping approaches have been proposed for contrast enhancement, how to automatically recovering overly bright and/or overly dark regions in an image without introducing extra artifacts still remains a challenging problem. Conventional approaches usually apply a translation-invariant filter to decompose the contrast information of an image into a global component and a detailed component and then adjust the contrast components according to some preselected criteria. However, the use of translation-invariant filter makes it hard to adaptively decompose the contrast information based on local image contents. To overcome this problem, we derive a global optimization approach with the use of cell-based matting Laplacian matrix to obtain more accurate decomposition. Besides, for the adjustment of contrast component, we present a spatially varying gamma adjustment approach that can locally recover poorly exposed regions and properly enhance contrast detail. This translation-varying approach can successfully suppress the halo artifacts without the loss of image details.
URI: http://hdl.handle.net/11536/22058
ISBN: 978-1-4673-2533-2
ISSN: 1522-4880
期刊: 2012 IEEE INTERNATIONAL CONFERENCE ON IMAGE PROCESSING (ICIP 2012)
起始頁: 945
結束頁: 948
顯示於類別:會議論文