public FastRetinaKeypointDescriptor GetDescriptor() { if (descriptor == null || pattern == null) { if (pattern == null) pattern = new FastRetinaKeypointPattern(octaves, scale); descriptor = new FastRetinaKeypointDescriptor(grayImage, integral, pattern); descriptor.setExtended(featureType == FastRetinaKeypointDescriptorType.Extended); } return descriptor; }