Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/6039
Title: Color demosaicking by local directional interpolation and nonlocal adaptive thresholding
Authors: Zhang, L 
Wu, X
Buades, A
Li, X
Keywords: Color image processing
Estimation
Interpolation
Pixels
Redundancy
Issue Date: Apr-2011
Publisher: SPIE-International Society for Optical Engineering
Source: Journal of electronic imaging, Apr. 2011, v. 20, no. 2, 023016, p. 1-16 How to cite?
Journal: Journal of electronic imaging 
Abstract: Single sensor digital color cameras capture only one of the three primary colors at each pixel and a process called color demosaicking (CDM) is used to reconstruct the full color images. Most CDM algorithms assume the existence of high local spectral redundancy in estimating the missing color samples. However, for images with sharp color transitions and high color saturation, such an assumption may be invalid and visually unpleasant CDM errors will occur. In this paper, we exploit the image nonlocal redundancy to improve the local color reproduction result. First, multiple local directional estimates of a missing color sample are computed and fused according to local gradients. Then, nonlocal pixels similar to the estimated pixel are searched to enhance the local estimate. An adaptive thresholding method rather than the commonly used nonlocal means filtering is proposed to improve the local estimate. This allows the final reconstruction to be performed at the structural level as opposed to the pixel level. Experimental results demonstrate that the proposed local directional interpolation and nonlocal adaptive thresholding method outperforms many state-of-the-art CDM methods in reconstructing the edges and reducing color interpolation artifacts, leading to higher visual quality of reproduced color images.
URI: http://hdl.handle.net/10397/6039
ISSN: 1017-9909
EISSN: 1560-229X
DOI: 10.1117/1.3600632
Rights: Zhang L, Wu X, Buades A and Li X, "Color demosaicking by local directional interpolation and nonlocal adaptive thresholding," J. Electron. Imaging., 20(2), 023016, p. 1-16 (2011)
Copyright 2011 Society of Photo-Optical Instrumentation Engineers & Society for Imaging Science and Technology. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
http://dx.doi.org/10.1117/1.3600632
Appears in Collections:Journal/Magazine Article

Files in This Item:
File Description SizeFormat 
Zhang_Color_Demosaicking_Local.pdf1.16 MBAdobe PDFView/Open
Access
View full-text via PolyU eLinks SFX Query
Show full item record

SCOPUSTM   
Citations

79
Last Week
0
Last month
0
Citations as of Aug 3, 2017

WEB OF SCIENCETM
Citations

53
Last Week
0
Last month
0
Citations as of Jul 28, 2017

Page view(s)

423
Last Week
1
Last month
Checked on Aug 14, 2017

Download(s)

350
Checked on Aug 14, 2017

Google ScholarTM

Check

Altmetric



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.