105 lines
2.4 KiB
C++
105 lines
2.4 KiB
C++
#include <opencv2\opencv.hpp>
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#include <opencv2\photo.hpp>
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#include <iostream>
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#include <map>
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using namespace cv;
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using namespace std;
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// https://stackoverflow.com/a/34734939/5008845
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void reducecolor_quantization(const mat3b& src, mat3b& dst)
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{
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uchar n = 64;
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dst = src / n;
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dst *= n;
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}
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// https://stackoverflow.com/a/34734939/5008845
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void reducecolor_kmeans(const mat3b& src, mat3b& dst)
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{
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int k = 8;
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int n = src.rows * src.cols;
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mat data = src.reshape(1, n);
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data.convertto(data, cv_32f);
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vector<int> labels;
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mat1f colors;
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kmeans(data, k, labels, cv::termcriteria(), 1, cv::kmeans_pp_centers, colors);
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for (int i = 0; i < n; ++i)
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{
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data.at<float>(i, 0) = colors(labels[i], 0);
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data.at<float>(i, 1) = colors(labels[i], 1);
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data.at<float>(i, 2) = colors(labels[i], 2);
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}
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mat reduced = data.reshape(3, src.rows);
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reduced.convertto(dst, cv_8u);
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}
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void reducecolor_stylization(const mat3b& src, mat3b& dst)
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{
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stylization(src, dst);
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}
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void reducecolor_edgepreserving(const mat3b& src, mat3b& dst)
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{
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edgepreservingfilter(src, dst);
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}
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struct lessvec3b
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{
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bool operator()(const vec3b& lhs, const vec3b& rhs) const {
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return (lhs[0] != rhs[0]) ? (lhs[0] < rhs[0]) : ((lhs[1] != rhs[1]) ? (lhs[1] < rhs[1]) : (lhs[2] < rhs[2]));
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}
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};
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map<vec3b, int, lessvec3b> getpalette(const mat3b& src)
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{
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map<vec3b, int, lessvec3b> palette;
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for (int r = 0; r < src.rows; ++r)
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{
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for (int c = 0; c < src.cols; ++c)
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{
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vec3b color = src(r, c);
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if (palette.count(color) == 0)
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{
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palette[color] = 1;
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}
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else
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{
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palette[color] = palette[color] + 1;
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}
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}
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}
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return palette;
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}
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int main()
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{
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mat3b img = imread("path_to_image");
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// reduce color
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mat3b reduced;
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//reducecolor_quantization(img, reduced);
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reducecolor_kmeans(img, reduced);
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//reducecolor_stylization(img, reduced);
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//reducecolor_edgepreserving(img, reduced);
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// get palette
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map<vec3b, int, lessvec3b> palette = getpalette(reduced);
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// print palette
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int area = img.rows * img.cols;
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for (auto color : palette)
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{
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cout << "color: " << color.first << " \t - area: " << 100.f * float(color.second) / float(area) << "%" << endl;
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}
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return 0;
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} |