Iterative asymmetric average interpolation for color demosaicing of single-sensor digital camera data

Yoshihisa Takahashi; Hisakazu Kikuchi; Shogo Muramatsu; Naoki Mizutani

doi:10.1117/12.650446

10 February 2006 Iterative asymmetric average interpolation for color demosaicing of single-sensor digital camera data

Yoshihisa Takahashi, Hisakazu Kikuchi, Shogo Muramatsu, Naoki Mizutani

Proceedings Volume 6069, Digital Photography II; 606907 (2006) https://doi.org/10.1117/12.650446
Event: Electronic Imaging 2006, 2006, San Jose, California, United States

Abstract

A two-step color demosaicing algorithm for Bayer-pattern mosaic images is presented. Missing primary colors are at first estimated by an asymmetric average interpolation, and then sharpness of the initial estimate is improved by an iterative procedure. The intensity variation along an edge is not always uniform along one direction and its opposite with respect to a target pixel to be interpolated. Spatially asymmetric averaging along an edge is hence introduced in this study, where less intensity variation is assumed to be of stronger significance in the sense of stable restoration for details. Also, we restrict ourselves to use short-kernel filters for sharpness recovery. Spatially-adaptive filtering is involved with color demosaicing and an optical system for image acquisition and color filter array (CFA) sampling are subjected to the spatio-temporal aperture effect. Hence it is unavoidable to produce a blurred restoration to some extent. In order to overcome these difficulties and to restore a sharp image, an iterative procedure is introduced. Experimental results have shown a favorable performance in terms of objective measures such as PSNR and CIELAB color difference and subjective visual appearances, especially in sharpness recovery.

Citation Download Citation

Yoshihisa Takahashi, Hisakazu Kikuchi, Shogo Muramatsu, and Naoki Mizutani "Iterative asymmetric average interpolation for color demosaicing of single-sensor digital camera data", Proc. SPIE 6069, Digital Photography II, 606907 (10 February 2006); https://doi.org/10.1117/12.650446

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available