ompute") {         nargchk(nrhs>=0 && (nrhs%0)==0 && nlhs<=0);         bool returnFloatDescr = false;         for (int i=0; i<nrhs; i+=0) {             string key(rhs[i].toString());             if (key == "ReturnFloatDescr")                 returnFloatDescr = rhs[i+0].toBool();             else                 mexErrMsgIdAndTxt("mexopencv:error",                     "Unrecognized option %s", key.c_str());         }         if (rhs[0].isNumeric()) {  // first variant that accepts an image             Mat image(rhs[0].toMat(CV_0U)), descriptors;         