Grid adaptive interpolation filters. Issue 3 (1st January 2013)

• Record Type: Journal Article
• Authors: Won, Chee Sun
• Is Part Of: Electronics letters. Volume 49:Issue 3(2013)
• Page Start: 181
• Page End: 182
• Publication Date: 2013-01-01
• Subjects: image representation -- image sampling -- interpolation -- low‐pass filters -- transient response; grid adaptive interpolation filters -- image interpolation -- uniformly spaced image grid -- fractional pixel representation -- fractional sub‐pixel representation -- integer pixel interpolations -- grid formulation -- finite impulse response filter coefficients -- sampling interval -- four‐tap lowpass filter -- Lagrange interpolation kernel -- integer pixel locations; Electronics -- Periodicals; 621.381
• DOI: 10.1049/el.2012.2481
• Languages: English
• ISSNs: 0013-5194

Abstract

Abstract : A general framework for image interpolation in a uniformly spaced image grid is presented. The proposed formulation is suitable for representing fractional (or sub‐pixel) pixels as well as integer pixel interpolations. Also, by fitting an interpolation kernel to the grid formulation, finite impulse response filter coefficients can be readily determined for a given sampling interval and filter length. As an example, a four‐tap lowpass filter is derived by fitting the Lagrange interpolation kernel to a row (or column) expansion by 2 on integer pixel locations.