|Table of Contents|

Shadow Detection and Removal in Single Outdoor Nature Scenes

《南京理工大学学报》(自然科学版)[ISSN:1005-9830/CN:32-1397/N]

Issue:
2011年01期
Page:
1-5
Research Field:
Publishing date:

Info

Title:
Shadow Detection and Removal in Single Outdoor Nature Scenes
Author(s):
HU YongZHAO Chun-xia
School of Computer Science and Technology,NUST,Nanjing 210094,China
Keywords:
shadow detection shadow removal Gaussian distribution Retinex
PACS:
TP391
DOI:
-
Abstract:
In order to improve the ability of Retinex algorithm in shadow removal,a novel algorithm is proposed to detect and remove shadows based on Gaussian distribution and Retinex model. Using gray distribution information,original images are segmented to three regions: shadow,penumbrae and umbra regions. The Retinex algorithm is adopted in shadow and umbra regions separately to extract and eliminate the effect of the illuminant. After the bilinear interpolation is used for filling up the penumbra region,a shadow-free image is finally obtained. The proposed algorithm achieves good performances in shadow detection and removal,and the halo artifacts generated by the Retinex algorithm in the high dynamic range area is avoided. Experimental results demonstrate the effectiveness of this algorithm.

References:

[1] Finlayson G D,Hordley S D,Lu C,et al. On the removal of shadows from images[J]. IEEE Transactions on Pattern Analysis and Machine Intelligence,2006, 28( 1) : 59-68.
[2] Finlayson G D,Hordley S D,Drew M S. Removing shadows from images using retinex[A]. Proceedings of IS & T/SID 10th Color Imaging Conference: Color Science,Systems and Applications[C]. Scottsdale: IS&T,2002: 73-79.
[3] Land E H. The Retinex theory of color vision[J]. Scientific American,1977,237( 6) : 108-129.
[4] Sun J,Tian J,Du Y,et al. Retinex theory-based shadow detection and removal in single outdoor image[J]. Industrial Robot,2009,36( 3) : 263-269.
[5] 唐亮,谢维信. 城市航空影像中基于模糊Retinex 的阴影消除[J]. 电子学报,2005,33( 3) : 500-503.
[6] 唐磊,赵春霞,王鸿南,等. 基于各向异性Retinex 的路面图像阴影消除[J]. 中国图象图形学报,2008, 13( 2) : 264-268.
[7] Baba M,Mukunoki M,Asada N. Shadow removal from a real image based on shadow density[A]. International Conference on Computer Graphics and Interactive Techniques[C]. California: ACM,2004: 60-61.
[8] He Q,Chu C H. Shadow removal from textured images [A]. Airborne Intelligence,Surveillance,Reconnaissance ( ISR) Systems and Applications VI[C]. Orlando: SPIE, 2009: 1-7.
[9] Jobson D J,Rahman Z,Woodell G A. Properties and performance of a center /surround Retinex[J]. IEEE Transactions on Image Processing,1997,6 ( 3 ) : 451 -462.
[10] Jobson D J,Rahman Z,Woodell G A. A multiscale Retinex for bridging the gap between color images and the human observation of scenes [J]. IEEE Transactions on Image Processing: Special Issue on Color Processing,1997,6( 7) : 965-976.
[11] 章毓晋. 过渡区和图象分割[J]. 电子学报,1996, 24( 1) : 12-17.

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Last Update: 2012-02-28