vendor: OpenCV 5.0.0 snapshot at 755e50675d97db9b7d449d8bd6b09888646f6c6e

modules/img_hash/test/test_phash.cpp

@@ -0,0 +1,60 @@
+// 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"
+
+#include <bitset>
+
+namespace opencv_test { namespace {
+
+class CV_PHashTest : public cvtest::BaseTest
+{
+public:
+    CV_PHashTest();
+    ~CV_PHashTest();
+protected:
+    void run(int /* idx */);
+};
+
+CV_PHashTest::CV_PHashTest(){}
+CV_PHashTest::~CV_PHashTest(){}
+
+void CV_PHashTest::run(int )
+{
+    cv::Mat input(32, 32, CV_8U);
+    cv::Mat hash;
+
+    uchar value = 0;
+    uchar *inPtr = input.ptr<uchar>(0);
+    for(size_t i = 0; i != 32*32; ++i)
+    {
+        inPtr[i] = value++;
+    }
+
+    cv::img_hash::pHash(input, hash);
+    bool const expectResult[] =
+    {
+        1,0,1,1,1,1,1,1,
+        0,1,1,1,1,1,1,1,
+        1,1,1,1,1,1,1,1,
+        0,1,1,1,1,1,1,1,
+        1,1,1,1,1,1,1,1,
+        0,1,1,1,1,1,1,1,
+        1,1,1,1,1,1,1,1,
+        0,1,1,1,1,1,1,1,
+    };
+    uchar const *hashPtr = hash.ptr<uchar>(0);
+    for(int i = 0; i != hash.cols; ++i)
+    {
+        std::bitset<8> const bits = hashPtr[i];
+        for(int j = 0; j != 8; ++j)
+        {
+            EXPECT_EQ(bits[j], expectResult[i*8+j]);
+        }
+    }
+}
+
+TEST(average_phash_test, accuracy) { CV_PHashTest test; test.safe_run(); }
+
+}} // namespace