A novel technique for reducing demosaicing artifacts
D. Menon, S. Andriani, and G. Calvagno
Proc. of the 14th European Signal Processing Conference
(Eusipco), Sept. 2006
Demosaicing is the process of reconstructing the full dimension representation of an image captured by
a digital camera with a color filter array. The color filter array allows for only one color measuring
for each pixel and the missing two colors have to be estimated. In literature many demosaicing
techniques have been proposed but the reconstructed images are affected by some visible and annoying
artifacts. In this paper we propose a new effective algorithm to reduce these artifacts. This algorithm
improves the performances of the demosaicing reconstruction, increasing the visual quality of the
resulting images. It can be applied directly after the color interpolation, or as a off-line
post-processing to improve the image acquired by the digital camera.
In this site various demosaicked images refined with the algorithm proposed in the paper are available
for an analysis of its performance.
The original images are taken from www.cipr.rpi.edu.
We downsampled them according to the Bayer
pattern and we reconstructed them with some known demosaicing techniques. Afterwards we applied the
proposed algorithm to reduce the demosaicing artifacts.
Go to a visual comparison of some resulting images (the PNG graphic format
Click here to download the demosaicked images (the uncompressed
TIFF format is used).
We compared the performance of the refining algorithm over the following demosaicing approaches:
- Bilinear Interpolation (BI);
- Edge-Directed Approach (ED): see Hamilton and Adams, "Adaptive color plane
interpolation in single sensor color electronic camera", U.S. Patent 5 629 734, May 1997;
- Homogeneity-Directed Demosaicing (HD): see Hirakawa and Parks, "Adaptive
homogeneity-directed demosaicing algorithm", IEEE Trans. Image Proc., Mar. 2005;
- Primary-Consistent Demosaicing (PC): see Wu and Zhang, "Primary-consistent
soft-decision color demosaicking for digital cameras", IEEE Trans. Image Proc.,
Instead, if you search a new demosaicing algorithm, you can see
Demosaicing with directional filtering and a posteriori decision