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histogram.cpp
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histogram.cpp
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/*
* Copyright (C) 2012 Jorge Aparicio <[email protected]>
*
* This file is part of ImageQ.
*
* ImageQ is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
* ImageQ is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with ImageQ. If not, see <http://www.gnu.org/licenses/>.
*/
#include "histogram.h"
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/imgproc/imgproc.hpp>
Histogram::Histogram(cv::Mat const& image, int const numberOfBins)
{
cv::Mat histogram;
std::vector<cv::Mat> images;
std::vector<int> channels;
std::vector<int> histSize;
std::vector<float> ranges;
images.push_back(image);
channels.push_back(0);
histSize.push_back(numberOfBins);
ranges.push_back(0);
ranges.push_back(256);
cv::calcHist(images, channels, cv::Mat(), histogram, histSize, ranges);
QVector<QwtIntervalSample> samples(numberOfBins);
for (int i = 0; i < numberOfBins; i++)
samples[i] = QwtIntervalSample(histogram.at<float>(i),
QwtInterval(i, i + 1));
QColor color(Qt::blue);
color.setAlpha(0);
setPen(QPen(color));
color.setAlpha(96);
setBrush(QBrush(color));
setData(new QwtIntervalSeriesData(samples));
}