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I'm not a specialist of shape context extractor but reading source code I found this :

    double logmin=log10(innerRadius);
    double logmax=log10(outerRadius);
    double delta=(logmax-logmin)/(nRadialBins-1);
    double accdelta=0;

I think you can find some explanation in 3.1 Shape Context of paper: Shape Matching and Object Recognition Using Shape Contexts Serge Belongie, Jitendra Malik, Jan Puzicha IEEE PAMI, 24, 24, 2002