Color Filter Array Demosaicking Using High-Order Interpolation Techniques With a Weighted Median Filter for Sharp Color Edge Preservation

Demosaicking is an estimation process to determine missing color values when a single-sensor digital camera is used for color image capture. In this paper, we propose a number of new methods based on the application of Taylor series and cubic spline interpolation for color filter array demosaicking....

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Bibliographic Details
Published in:IEEE transactions on image processing 2009-09, Vol.18 (9), p.1946-1957
Main Authors: Li, J.S.J., Randhawa, S.
Format: Article
Language:English
Subjects:
Applied sciences
Arrays
Color
Color filter array
cubic spline
demosaicking
Detection, estimation, filtering, equalization, prediction
Digital cameras
Digital filters
Exact sciences and technology
Humans
Image processing
Image sensors
Information, signal and communications theory
Interpolation
Orientation
Preserves
Sensor arrays
Signal and communications theory
Signal processing
Signal representation. Spectral analysis
Signal, noise
Spline
Splines
Taylor series
Telecommunications and information theory
Visual system
weighted median filter
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Summary:Demosaicking is an estimation process to determine missing color values when a single-sensor digital camera is used for color image capture. In this paper, we propose a number of new methods based on the application of Taylor series and cubic spline interpolation for color filter array demosaicking. To avoid the blurring of an edge, interpolants are first estimated in four opposite directions so that no interpolation is carried out across an edge. A weighted median filter, whose filter coefficients are determined by a classifier based on an edge orientation map, is then used to produce an output from the four interpolants to preserve edges. Using the proposed methods, the original color can be faithfully reproduced with minimal amount of color artifacts even at edges.
ISSN:1057-7149
1941-0042
DOI:10.1109/TIP.2009.2022291