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 |
Issue Date: | Apr-2011 | Source: | Journal of electronic imaging, Apr. 2011, v. 20, no. 2, 023016, p. 1-16 | 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. | Keywords: | Color image processing Estimation Interpolation Pixels Redundancy |
Publisher: | SPIE-International Society for Optical Engineering | Journal: | Journal of electronic imaging | 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 | Size | Format | |
---|---|---|---|---|
Zhang_Color_Demosaicking_Local.pdf | 1.16 MB | Adobe PDF | View/Open |
Page views
205
Last Week
0
0
Last month
Citations as of Sep 22, 2024
Downloads
960
Citations as of Sep 22, 2024
SCOPUSTM
Citations
395
Last Week
3
3
Last month
0
0
Citations as of Sep 26, 2024
WEB OF SCIENCETM
Citations
242
Last Week
2
2
Last month
0
0
Citations as of Sep 26, 2024
Google ScholarTM
Check
Altmetric
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.