attribute.cpp
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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright 2012 The MITRE Corporation *
* *
* Licensed under the Apache License, Version 2.0 (the "License"); *
* you may not use this file except in compliance with the License. *
* You may obtain a copy of the License at *
* *
* http://www.apache.org/licenses/LICENSE-2.0 *
* *
* Unless required by applicable law or agreed to in writing, software *
* distributed under the License is distributed on an "AS IS" BASIS, *
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. *
* See the License for the specific language governing permissions and *
* limitations under the License. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
#include <openbr/plugins/openbr_internal.h>
namespace br
{
/*!
* \ingroup distances
* \brief Attenuation function based distance from attributes
* \author Scott Klum \cite sklum
*/
class AttributeDistance : public UntrainableDistance
{
Q_OBJECT
Q_PROPERTY(QString attribute READ get_attribute WRITE set_attribute RESET reset_attribute STORED false)
BR_PROPERTY(QString, attribute, QString())
float compare(const Template &target, const Template &query) const
{
float queryValue = query.file.get<float>(attribute);
float targetValue = target.file.get<float>(attribute);
// TODO: Set this magic number to something meaningful
float stddev = 1;
if (queryValue == targetValue) return 1;
else return 1/(stddev*sqrt(2*CV_PI))*exp(-0.5*pow((targetValue-queryValue)/stddev, 2));
}
};
BR_REGISTER(Distance, AttributeDistance)
} // namespace br
#include "distance/attribute.moc"