Marcel Birthelmer wrote: > One way of detecting symmetric objects is convolution. There is no need for objects to be symmetric to detect their signature with convolution. It does, however, alleviate orientation issues. ******************************************************************** Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products (978) 742-9014. Gold level PIC consultants since 2000. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist