NEW DEMOSAICING ALGORITHM ESPECIALLY FOR MEASUREMENT OF GEOMETRIES BY IMAGE PROCESSING

Martin Correns, Maik Schumann, Holger Weissensee, Maik Rosenberger, Mathias Schellhorn, Gerhard Linß

Abstract

Most cost-effective colour cameras have single image sensors with a fixed repeating pattern of colour filters with transmission spectra analogous to the human eye. To reconstruct a full colour image a process often referred to as "demosaicing" is necessary. Almost every past method for demosaicing had the intention to create the most pleasant image for the human observer. For dimensional measurement the priority is to create images without geometric errors, while the aesthetics of an image should only be the second priority. From a metrological point of view, the most important issue with this type of raw image data is that the three channels all have different pixel-grid positions and two different resolutions. This paper presents a new demosaicing method that is especially designed for applications of dimensional measurement and compares its application to common demosaicing methods.

Keywords

demosaicing, colour images, geometric measurement

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IMEKO-WC-2009-TC14-113.pdf

DOI

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IMEKO TC

TC14 - Measurement of Geometrical Quantities

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