chore: import upstream snapshot with attribution

2026-07-13 12:06:04 +08:00
commit 86c9b1c39f
7743 changed files with 3316339 additions and 0 deletions
@@ -0,0 +1,46 @@
+// 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(Features2d_SIFT, descriptor_type)
+{
+    Mat image = imread(cvtest::findDataFile("features2d/tsukuba.png"));
+    ASSERT_FALSE(image.empty());
+
+    Mat gray;
+    cvtColor(image, gray, COLOR_BGR2GRAY);
+
+    vector<KeyPoint> keypoints;
+    Mat descriptorsFloat, descriptorsUchar;
+    Ptr<SIFT> siftFloat = cv::SIFT::create(0, 3, 0.04, 10, 1.6, CV_32F);
+    siftFloat->detectAndCompute(gray, Mat(), keypoints, descriptorsFloat, false);
+    ASSERT_EQ(descriptorsFloat.type(), CV_32F) << "type mismatch";
+
+    Ptr<SIFT> siftUchar = cv::SIFT::create(0, 3, 0.04, 10, 1.6, CV_8U);
+    siftUchar->detectAndCompute(gray, Mat(), keypoints, descriptorsUchar, false);
+    ASSERT_EQ(descriptorsUchar.type(), CV_8U) << "type mismatch";
+
+    Mat descriptorsFloat2;
+    descriptorsUchar.assignTo(descriptorsFloat2, CV_32F);
+    Mat diff = descriptorsFloat != descriptorsFloat2;
+    ASSERT_EQ(countNonZero(diff), 0) << "descriptors are not identical";
+}
+
+TEST(Features2d_SIFT, regression_26139)
+{
+    auto extractor = cv::SIFT::create();
+    cv::Mat1b image{cv::Size{300, 300}, 0};
+    std::vector<cv::KeyPoint> kps {
+        cv::KeyPoint(154.076813f, 136.160904f, 111.078636f, 216.195618f, 0.00000899323549f, 7)
+    };
+    cv::Mat descriptors;
+    extractor->compute(image, kps, descriptors); // we expect no memory corruption
+    ASSERT_EQ(descriptors.size(), Size(128, 1));
+}
+
+
+}} // namespace