private float getDistance(Document d, ColorLayout cl, ScalableColor sc, EdgeHistogram eh) {
float distance = 0f;
int descriptorCount = 0;
if (cl != null) {
String[] cls = d.getValues(DocumentBuilder.FIELD_NAME_COLORLAYOUT);
if (cls != null && cls.length > 0) {
ColorLayout clsi = new ColorLayout();
clsi.setStringRepresentation(cls[0]);
distance += cl.getDistance(clsi) * colorDistributionWeight;
descriptorCount++;
}
}
if (sc != null) {
String[] scs = d.getValues(DocumentBuilder.FIELD_NAME_SCALABLECOLOR);
if (scs != null && scs.length > 0) {
ScalableColor scsi = new ScalableColor();
scsi.setStringRepresentation(scs[0]);
distance += sc.getDistance(scsi) * colorHistogramWeight;
descriptorCount++;
}
}
if (eh != null) {
String[] ehs = d.getValues(DocumentBuilder.FIELD_NAME_EDGEHISTOGRAM);
if (ehs != null && ehs.length > 0) {
EdgeHistogram ehsi = new EdgeHistogram();
ehsi.setStringRepresentation(ehs[0]);
distance += eh.getDistance(ehsi) * textureWeight;
descriptorCount++;
}
}
if (descriptorCount > 0) {
// TODO: find some better scoring mechanism, e.g. some normalization. One thing would be
// linearization of the features!
// For now: Averaging ...
distance = distance / (float) descriptorCount;
}
return distance;
}
