vendor: OpenCV 5.0.0 snapshot at 40738fb16ceddb5fb3fea747585f7ce6abb0605b

2026-08-22 00:10:33 +08:00
commit f7f077da11
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+// 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 "perf_precomp.hpp"
+
+#include "perf_bgfg_utils.hpp"
+
+namespace opencv_test { namespace {
+
+//////////////////////////// KNN//////////////////////////
+
+typedef tuple<std::string, int> VideoKNNParamType;
+typedef TestBaseWithParam<VideoKNNParamType> KNN_Apply;
+typedef TestBaseWithParam<VideoKNNParamType> KNN_GetBackgroundImage;
+
+PERF_TEST_P(KNN_Apply, KNN, Combine(Values("cv/video/768x576.avi", "cv/video/1920x1080.avi"), Values(1,3)))
+{
+    VideoKNNParamType params = GetParam();
+
+    const string inputFile = getDataPath(get<0>(params));
+
+    const int cn = get<1>(params);
+    int nFrame = 5;
+
+    vector<Mat> frame_buffer(nFrame);
+
+    cv::VideoCapture cap(inputFile);
+    if (!cap.isOpened())
+        throw SkipTestException("Video file can not be opened");
+    prepareData(cap, cn, frame_buffer);
+
+    Mat foreground;
+
+    TEST_CYCLE()
+    {
+        Ptr<cv::BackgroundSubtractorKNN> knn = createBackgroundSubtractorKNN();
+        knn->setDetectShadows(false);
+        foreground.release();
+        for (int i = 0; i < nFrame; i++)
+        {
+            knn->apply(frame_buffer[i], foreground);
+        }
+    }
+    SANITY_CHECK_NOTHING();
+}
+
+PERF_TEST_P(KNN_GetBackgroundImage, KNN, Values(
+        std::make_pair<string, int>("cv/video/768x576.avi", 5),
+        std::make_pair<string, int>("cv/video/1920x1080.avi", 5)))
+{
+    VideoKNNParamType params = GetParam();
+
+    const string inputFile = getDataPath(get<0>(params));
+
+    const int cn = 3;
+    const int skipFrames = get<1>(params);
+    int nFrame = 10;
+
+    vector<Mat> frame_buffer(nFrame);
+
+    cv::VideoCapture cap(inputFile);
+    if (!cap.isOpened())
+        throw SkipTestException("Video file can not be opened");
+    prepareData(cap, cn, frame_buffer, skipFrames);
+
+    Mat foreground, background;
+
+    TEST_CYCLE()
+    {
+        Ptr<cv::BackgroundSubtractorKNN> knn = createBackgroundSubtractorKNN();
+        knn->setDetectShadows(false);
+        foreground.release();
+        background.release();
+        for (int i = 0; i < nFrame; i++)
+        {
+            knn->apply(frame_buffer[i], foreground);
+        }
+        knn->getBackgroundImage(background);
+    }
+#ifdef DEBUG_BGFG
+    imwrite(format("fg_%d_%d_knn.png", frame_buffer[0].rows, cn), foreground);
+    imwrite(format("bg_%d_%d_knn.png", frame_buffer[0].rows, cn), background);
+#endif
+    SANITY_CHECK_NOTHING();
+}
+
+}}// namespace