A locally adaptive algorithm for shadow correction in color images

The paper deals with correction of color images distorted by spatially nonuniform illumination. A serious distortion occurs in real conditions when a part of the scene containing 3D objects close to a directed light source is illuminated much brighter than the rest of the scene. A locally-adaptive algorithm for correction of shadow regions in color images is proposed. The algorithm consists of segmentation of shadow areas with rank-order statistics followed by correction of nonuniform illumination with human visual perception approach. The performance of the proposed algorithm is compared to that of common algorithms for correction of color images containing shadow regions.

[1]  Guang Deng,et al.  A Generalized Unsharp Masking Algorithm , 2011, IEEE Transactions on Image Processing.

[2]  Gabriel Thomas,et al.  Histogram Specification: A Fast and Flexible Method to Process Digital Images , 2011, IEEE Transactions on Instrumentation and Measurement.

[3]  I. A. Ovseyevich,et al.  Unsharp Masking by the Rank-Order Filters with Spatially Adaptive Neighborhoods , 2002 .

[4]  A. Oppenheim,et al.  Nonlinear filtering of multiplied and convolved signals , 1968 .

[5]  Zia-ur Rahman,et al.  Retinex processing for automatic image enhancement , 2004, J. Electronic Imaging.

[6]  E. Land,et al.  Lightness and retinex theory. , 1971, Journal of the Optical Society of America.

[7]  Giovanni Ramponi,et al.  Image enhancement via adaptive unsharp masking , 2000, IEEE Trans. Image Process..

[8]  Manjunatha Mahadevappa,et al.  Brightness preserving dynamic fuzzy histogram equalization , 2010, IEEE Transactions on Consumer Electronics.

[9]  Vitaly Kober,et al.  Nonlinear filters with spatially-connected neighborhoods , 2001 .

[10]  I. A. Ovseyevich,et al.  Rank Image Processing Using Spatially Adaptive Neighborhoods 1 , 2001 .

[11]  Vitaly Kober.  Robust and efficient algorithm of image enhancement , 2006, IEEE Transactions on Consumer Electronics.

[12]  Rafael C. González,et al.  Local Determination of a Moving Contrast Edge , 1985, IEEE Transactions on Pattern Analysis and Machine Intelligence.

[13]  Sankar K. Pal,et al.  Non-parametric modified histogram equalisation for contrast enhancement , 2013, IET Image Process..

[14]  E. Land.  Recent advances in retinex theory , 1986, Vision Research.

[15]  Hai-Miao Hu,et al.  Naturalness Preserved Enhancement Algorithm for Non-Uniform Illumination Images , 2013, IEEE Transactions on Image Processing.

[16]  Zia-ur Rahman,et al.  Properties and performance of a center/surround retinex , 1997, IEEE Trans. Image Process..

[17]  Sangkeun Lee,et al.  Efficient naturalness restoration for non-uniform illumination images , 2015, IET Image Process..

[18]  Alvy Ray Smith,et al.  Color gamut transform pairs , 1978, SIGGRAPH.

[19]  Vitaly Kober,et al.  Adaptive correction of nonuniform illumination of multispectral digital images , 2016 .

[20]  William F. Schreiber.  Wirephoto quality improvement by unsharp masking , 1970, Pattern Recognit..

[21]  Zia-ur Rahman,et al.  A multiscale retinex for bridging the gap between color images and the human observation of scenes , 1997, IEEE Trans. Image Process..

[22]  Werner Frei,et al.  Image Enhancement by Histogram Hyperbolization , 1977 .

[23]  Azeddine Beghdadi,et al.  Natural Enhancement of Color Image , 2010, EURASIP J. Image Video Process..