largestconvexarea.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 <opencv2/imgproc/imgproc.hpp>
#include <openbr/plugins/openbr_internal.h>
using namespace cv;
namespace br
{
/*!
* \ingroup transforms
* \brief Set the template's label to the area of the largest convex hull.
* \author Josh Klontz \cite jklontz
*/
class LargestConvexAreaTransform : public UntrainableTransform
{
Q_OBJECT
Q_PROPERTY(QString outputVariable READ get_outputVariable WRITE set_outputVariable RESET reset_outputVariable STORED false)
BR_PROPERTY(QString, outputVariable, "Label")
void project(const Template &src, Template &dst) const
{
std::vector< std::vector<Point> > contours;
findContours(src.m().clone(), contours, RETR_EXTERNAL, CHAIN_APPROX_SIMPLE);
double maxArea = 0;
foreach (const std::vector<Point> &contour, contours) {
std::vector<Point> hull;
convexHull(contour, hull);
double area = contourArea(contour);
double hullArea = contourArea(hull);
if (area / hullArea > 0.98)
maxArea = std::max(maxArea, area);
}
dst.file.set(outputVariable, maxArea);
}
};
BR_REGISTER(Transform, LargestConvexAreaTransform)
} // namespace br
#include "imgproc/largestconvexarea.moc"