NDLI: Simple median-based EP PP scheme for enhancement of reconstructed Bayer colour filter array images

Content Provider	IET Digital Library
Author	Yang, Yi Hong Wang, Peng Hua Chen, Po Ning
Abstract	In this study, the median-based edge-preserving (EP) modification is revisited and has been shown to improve effectively the quality of a reconstructed Bayer colour filter array image in terms of the composite peak signal-to-noise ratio (CPSNR) performance index. Along this research direction, the authors propose an EP-modified signal-correlation-based (SCB) post-processing (PP), called EP-SCB, as an enhancement to any existing interpolation method. The Bayer image reconstruction system they consider thus consists of two operational phases. The first phase performs an initial estimation of the missing red, green and blue colours by using an existing interpolation method, whereas the second phase applies EP-SCB PP. Since a certain class of images may not fulfil the premise of having small variations in local colour difference, which is assumed by SCB-type interpolation, thereby resulting in a deterioration in CPSNR after EP-SCB PP, a threshold test on local variance ratio is also devised to conditionally switch off the second phase. Experimental results show that the EP-SCB PP with variance-ratio test gives a worst average CPSNR than the original interpolation methods tested in none of the Kodak and IMAX image groups experimented.
Starting Page	943
Ending Page	951
Page Count	9
ISSN	17519659
Volume Number	10
e-ISSN	17519667
Issue Number	Issue 12, Dec (2016)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-ipr/10/12
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-ipr.2015.0815
Journal	IET Image Processing
Publisher Date	2016-07-11
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Composite Peak Signal-to-noise Ratio Computer Vision And Image Processing Technique CPSNR EP-modified Signal-correlation-based Post-processing Image Colour Analysis Image Enhancement Image Filtering IMAX Image Group Interpolation Interpolation And Function Approximation Interpolation Method Kodak Median Filter Median-based Edge-preserving Modification Numerical Analysis Optical, Image And Video Signal Processing Reconstructed Bayer Colour Filter Array Image Enhancement SCB PP Simple Median-based EP PP Scheme Variance-ratio Test
Content Type	Text
Resource Type	Article
Subject	Signal Processing Electrical and Electronic Engineering Computer Vision and Pattern Recognition Software

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