54 lines
1.3 KiB
C++
54 lines
1.3 KiB
C++
#include <iostream>
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#include "opencv2/opencv.hpp"
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using namespace cv;
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using namespace std;
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void on_trackbar(int pos, void* userdata);
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int main(int argc, char* argv[]) {
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Mat src;
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if (argc < 2)
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src = imread("../../resources/images/neutrophils.png", IMREAD_GRAYSCALE);
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else
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src = imread(argv[1], IMREAD_GRAYSCALE);
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if (src.empty()) {
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cerr << "Image load failed!" << endl;
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return -1;
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}
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namedWindow("dst");
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createTrackbar("Threshold", "dst", 0, 255, on_trackbar, (void*)&src);
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setTrackbarPos("Threshold", "dst", 128);
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cv::waitKey();
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cv::destroyAllWindows();
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}
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void on_trackbar(int pos, void* userdata) {
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Mat src = *(Mat*)userdata;
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Mat hist;
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int channels[] = { 0 };
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int dims = 1;
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const int histSize[] = { 256 };
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float graylevel[] = { 0, 256 };
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const float* ranges[] = { graylevel };
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calcHist(&src, 1, channels, noArray(), hist, dims, histSize, ranges);
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double histMax;
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minMaxLoc(hist, 0, &histMax);
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Mat imgHist(100, 256, CV_8UC1, Scalar(255));
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for (int i = 0; i < 256; i++) {
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line(imgHist, Point(i, 100), Point(i, 100 - cvRound(hist.at<float>(i, 0) * 100 / histMax)), Scalar(0));
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}
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line(imgHist, Point(pos, 0), Point(pos, 100), 0, 1, LINE_AA);
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Mat dst;
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threshold(src, dst, pos, 255, THRESH_BINARY);
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imshow("dst", dst);
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imshow("hist", imgHist);
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} |