vendor: OpenCV 5.0.0 snapshot at 755e50675d97db9b7d449d8bd6b09888646f6c6e

modules/ximgproc/test/test_niblack_threshold.cpp

@@ -0,0 +1,29 @@
+// This file is part of OpenCV project.
+// It is subject to the license terms in the LICENSE file found in the top-level directory
+// of this distribution and at http://opencv.org/license.html.
+#include "test_precomp.hpp"
+
+namespace opencv_test { namespace {
+
+TEST(ximgproc_niBlackThreshold, sauvola)
+{
+    Mat src = (Mat_<uchar>(3, 3) << 1, 1, 1, 2, 2, 2, 3, 3, 3);
+    Mat dst;
+    cv::ximgproc::niBlackThreshold(src, dst, 255, THRESH_BINARY, 3, 1, BINARIZATION_SAUVOLA, 1);
+
+    EXPECT_EQ(CV_8U, dst.type());
+    EXPECT_EQ(3, dst.rows);
+    EXPECT_EQ(3, dst.cols);
+
+    EXPECT_EQ(0, dst.at<uchar>(0, 0));
+    EXPECT_EQ(0, dst.at<uchar>(0, 1));
+    EXPECT_EQ(0, dst.at<uchar>(0, 2));
+    EXPECT_EQ(0, dst.at<uchar>(1, 0));
+    EXPECT_EQ(0, dst.at<uchar>(1, 1));
+    EXPECT_EQ(0, dst.at<uchar>(1, 2));
+    EXPECT_EQ(255, dst.at<uchar>(2, 0));
+    EXPECT_EQ(255, dst.at<uchar>(2, 1));
+    EXPECT_EQ(255, dst.at<uchar>(2, 2));
+}
+
+}} // namespace