Internal change

PiperOrigin-RevId: 516179167

mediapipe/examples/desktop/autoflip/quality/padding_effect_generator_test.cc

@@ -138,7 +138,23 @@ void TestWithAspectRatio(const double aspect_ratio,
     std::string result_image;
     MP_ASSERT_OK(
         mediapipe::file::GetContents(result_string_path, &result_image));
-    EXPECT_EQ(result_image, output_string);
+    if (result_image != output_string) {
+      // There may be slight differences due to the way the JPEG was encoded or
+      // the OpenCV version used to generate the reference files. Compare
+      // pixel-by-pixel using the Peak Signal-to-Noise Ratio instead.
+      cv::Mat result_mat =
+          cv::imdecode(cv::Mat(1, result_image.size(), CV_8UC1,
+                               const_cast<char*>(result_image.data())),
+                       cv::IMREAD_UNCHANGED);
+      cv::Mat output_mat =
+          cv::imdecode(cv::Mat(1, output_string.size(), CV_8UC1,
+                               const_cast<char*>(output_string.data())),
+                       cv::IMREAD_UNCHANGED);
+      ASSERT_EQ(result_mat.rows, output_mat.rows);
+      ASSERT_EQ(result_mat.cols, output_mat.cols);
+      ASSERT_EQ(result_mat.type(), output_mat.type());
+      EXPECT_GT(cv::PSNR(result_mat, output_mat), 45.0);
+    }
   } else {
     std::string output_string_path = mediapipe::file::JoinPath(
         absl::GetFlag(FLAGS_output_folder),