/**
* Compare protos p1 and p2 and return an estimate of the
* worst evidence rating that will result for any part of p1
* that is compared to p2. In other words, if p1 were broken
* into pico-features and each pico-feature was matched to p2,
* what is the worst evidence rating that will be achieved for
* any pico-feature.
*
* @param p1, p2 protos to be compared
*
* Globals: none
*
* @return Worst possible result when matching p1 to p2.
* @note Exceptions: none
* @note History: Mon Nov 26 08:27:53 1990, DSJ, Created.
*/
FLOAT32 CompareProtos(PROTO p1, PROTO p2) {
FEATURE Feature;
FLOAT32 WorstEvidence = WORST_EVIDENCE;
FLOAT32 Evidence;
FLOAT32 Angle, Length;
/* if p1 and p2 are not close in length, don't let them match */
Length = fabs (p1->Length - p2->Length);
if (Length > MAX_LENGTH_MISMATCH)
return (0.0);
/* create a dummy pico-feature to be used for comparisons */
Feature = NewFeature (&PicoFeatDesc);
Feature->Params[PicoFeatDir] = p1->Angle;
/* convert angle to radians */
Angle = p1->Angle * 2.0 * PI;
/* find distance from center of p1 to 1/2 picofeat from end */
Length = p1->Length / 2.0 - GetPicoFeatureLength () / 2.0;
if (Length < 0) Length = 0;
/* set the dummy pico-feature at one end of p1 and match it to p2 */
Feature->Params[PicoFeatX] = p1->X + cos (Angle) * Length;
Feature->Params[PicoFeatY] = p1->Y + sin (Angle) * Length;
if (DummyFastMatch (Feature, p2)) {
Evidence = SubfeatureEvidence (Feature, p2);
if (Evidence < WorstEvidence)
WorstEvidence = Evidence;
} else {
FreeFeature(Feature);
return 0.0;
}
/* set the dummy pico-feature at the other end of p1 and match it to p2 */
Feature->Params[PicoFeatX] = p1->X - cos (Angle) * Length;
Feature->Params[PicoFeatY] = p1->Y - sin (Angle) * Length;
if (DummyFastMatch (Feature, p2)) {
Evidence = SubfeatureEvidence (Feature, p2);
if (Evidence < WorstEvidence)
WorstEvidence = Evidence;
} else {
FreeFeature(Feature);
return 0.0;
}
FreeFeature (Feature);
return (WorstEvidence);
} /* CompareProtos */
/*---------------------------------------------------------------------------*/
FLOAT32 CompareProtos(PROTO p1, PROTO p2) {
/*
** Parameters:
** p1, p2 protos to be compared
** Globals: none
** Operation: Compare protos p1 and p2 and return an estimate of the
** worst evidence rating that will result for any part of p1
** that is compared to p2. In other words, if p1 were broken
** into pico-features and each pico-feature was matched to p2,
** what is the worst evidence rating that will be achieved for
** any pico-feature.
** Return: Worst possible result when matching p1 to p2.
** Exceptions: none
** History: Mon Nov 26 08:27:53 1990, DSJ, Created.
*/
FEATURE Feature;
FLOAT32 WorstEvidence = WORST_EVIDENCE;
FLOAT32 Evidence;
FLOAT32 Angle, Length;
/* if p1 and p2 are not close in length, don't let them match */
Length = fabs (p1->Length - p2->Length);
if (Length > MAX_LENGTH_MISMATCH)
return (0.0);
/* create a dummy pico-feature to be used for comparisons */
Feature = NewFeature (&PicoFeatDesc);
Feature->Params[PicoFeatDir] = p1->Angle;
/* convert angle to radians */
Angle = p1->Angle * 2.0 * PI;
/* find distance from center of p1 to 1/2 picofeat from end */
Length = p1->Length / 2.0 - GetPicoFeatureLength () / 2.0;
if (Length < 0) Length = 0;
/* set the dummy pico-feature at one end of p1 and match it to p2 */
Feature->Params[PicoFeatX] = p1->X + cos (Angle) * Length;
Feature->Params[PicoFeatY] = p1->Y + sin (Angle) * Length;
if (DummyFastMatch (Feature, p2)) {
Evidence = SubfeatureEvidence (Feature, p2);
if (Evidence < WorstEvidence)
WorstEvidence = Evidence;
} else {
FreeFeature(Feature);
return 0.0;
}
/* set the dummy pico-feature at the other end of p1 and match it to p2 */
Feature->Params[PicoFeatX] = p1->X - cos (Angle) * Length;
Feature->Params[PicoFeatY] = p1->Y - sin (Angle) * Length;
if (DummyFastMatch (Feature, p2)) {
Evidence = SubfeatureEvidence (Feature, p2);
if (Evidence < WorstEvidence)
WorstEvidence = Evidence;
} else {
FreeFeature(Feature);
return 0.0;
}
FreeFeature (Feature);
return (WorstEvidence);
} /* CompareProtos */
