RI-MINACE FILTERS TO AUGMENT SEGMENTATION OF TOUCHING OBJECTS

Abstract

RI-MINACE filters are described for a rotation-invariant distortion-invariant multi-object detection problem. The objects are agricultural products, pistachio nuts, and the sensor is X-ray. The nuts can have any orientation hence rotation invariance is necessary. Distortion invariance is needed because each nut varies in size and shape. To detect the separate correlation peaks, we use peaksorting with a window and minimum threshold. Design issues that arise in this application include: use of gray scale or binary images; the circular harmonic function order to use; selection of the reference object, the size of the filter, the MINACE control parameter c, and the peaksorting parameters.