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Class of algorithms for realtime subpixel registration

: Frischholz, R.W.; Spinnler, K.P.

Braggins, D.W. ; Society for Imaging Science and Technology -IS&T-; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.; European Optical Society -EOS-:
Computer vision for industry : 24-25 June 1993, Munich, FRG
Bellingham, Wash.: SPIE, 1993 (Europto series)
ISBN: 0-8194-1238-4
International Symposium on Electronic Imaging Device Engineering <1993, München>
Fraunhofer IIS A ( IIS) ()
Bildverarbeitung; Echtzeitanwendung; image processing; industrial application; industrielle Anwendung; real time application

In 1972, Barnea and Silverman presented a new approach to the wide field of template matching, the SSD-algorithm. Further work has been done to adapt the method to gain subpixel accuracy. Intense investigation of the proposed algorithms led to our new approach: by interpolating the template instead of reference image, and by applying sort of an error-correction to the resulting subpixel-value, both computation time and accuracy can be improved. Exhaustive experiments with a CCD-camera and various kinds of reference images showed that a maximum error of 10 per cent of the pixel period can be expected. Depending on the kind of image, mean square errors range from 0.4 per cent to 4 per cent.