vendor: OpenCV 5.0.0 snapshot at 755e50675d97db9b7d449d8bd6b09888646f6c6e

2026-08-22 00:11:13 +08:00
commit 12022378a3
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+/*
+ * C++ sample to demonstrate Niblack thresholding.
+ */
+
+#include <iostream>
+#include "opencv2/core.hpp"
+#include "opencv2/highgui.hpp"
+#include "opencv2/imgproc.hpp"
+#include "opencv2/ximgproc.hpp"
+
+using namespace std;
+using namespace cv;
+using namespace cv::ximgproc;
+
+Mat_<uchar> src;
+int k_ = 8;
+int blockSize_ = 11;
+int type_ = THRESH_BINARY;
+int method_ = BINARIZATION_NIBLACK;
+
+void on_trackbar(int, void*);
+
+int main(int argc, char** argv)
+{
+    // read gray-scale image
+    if(argc != 2)
+    {
+        cout << "Usage: ./niblack_thresholding [IMAGE]\n";
+        return 1;
+    }
+    const char* filename = argv[1];
+    src = imread(filename, IMREAD_GRAYSCALE);
+    imshow("Source", src);
+
+    namedWindow("Niblack", WINDOW_AUTOSIZE);
+    createTrackbar("k", "Niblack", &k_, 20, on_trackbar);
+    createTrackbar("blockSize", "Niblack", &blockSize_, 30, on_trackbar);
+    createTrackbar("method", "Niblack", &method_, 3, on_trackbar);
+    createTrackbar("threshType", "Niblack", &type_, 4, on_trackbar);
+    on_trackbar(0, 0);
+    waitKey(0);
+
+    return 0;
+}
+
+void on_trackbar(int, void*)
+{
+    double k = static_cast<double>(k_-10)/10;                 // [-1.0, 1.0]
+    int blockSize = 2*(blockSize_ >= 1 ? blockSize_ : 1) + 1; // 3,5,7,...,61
+    int type = type_;  // THRESH_BINARY, THRESH_BINARY_INV,
+                       // THRESH_TRUNC, THRESH_TOZERO, THRESH_TOZERO_INV
+    int method = method_; //BINARIZATION_NIBLACK, BINARIZATION_SAUVOLA, BINARIZATION_WOLF, BINARIZATION_NICK
+    Mat dst;
+    niBlackThreshold(src, dst, 255, type, blockSize, k, method);
+    imshow("Niblack", dst);
+}