Extracted common test helper functions out from the unittest into a sharable

library. Also migrated away from OpenCVX.

PiperOrigin-RevId: 490074410

mediapipe/util/BUILD

@@ -368,3 +368,21 @@ cc_test(
         "//mediapipe/framework/port:gtest_main",
     ],
 )
+
+cc_library(
+    name = "image_test_utils",
+    testonly = 1,
+    srcs = ["image_test_utils.cc"],
+    hdrs = ["image_test_utils.h"],
+    visibility = ["//visibility:public"],
+    deps = [
+        "//mediapipe/framework:packet",
+        "//mediapipe/framework:timestamp",
+        "//mediapipe/framework/formats:image",
+        "//mediapipe/framework/formats:image_frame",
+        "//mediapipe/framework/formats:image_frame_opencv",
+        "//mediapipe/framework/port:opencv_core",
+        "//mediapipe/framework/port:opencv_imgcodecs",
+        "//mediapipe/framework/port:opencv_imgproc",
+    ],
+)

mediapipe/util/image_test_utils.cc

@@ -0,0 +1,57 @@
+#include "mediapipe/util/image_test_utils.h"
+
+#include "mediapipe/framework/formats/image_frame.h"
+#include "mediapipe/framework/formats/image_frame_opencv.h"
+#include "mediapipe/framework/port/opencv_core_inc.h"
+#include "mediapipe/framework/port/opencv_imgcodecs_inc.h"
+#include "mediapipe/framework/port/opencv_imgproc_inc.h"
+#include "mediapipe/framework/timestamp.h"
+
+namespace mediapipe {
+
+cv::Mat GetRgb(const std::string& path) {
+  cv::Mat bgr = cv::imread(path);
+  cv::Mat rgb;
+  cv::cvtColor(bgr, rgb, cv::COLOR_BGR2RGB);
+  return rgb;
+}
+
+cv::Mat GetRgba(const std::string& path) {
+  cv::Mat bgr = cv::imread(path);
+  cv::Mat rgb;
+  cv::cvtColor(bgr, rgb, cv::COLOR_BGR2RGBA);
+  return rgb;
+}
+
+cv::Mat GetGray(const std::string& path) {
+  cv::Mat bgr = cv::imread(path);
+  cv::Mat gray;
+  cv::cvtColor(bgr, gray, cv::COLOR_BGR2GRAY);
+  return gray;
+}
+
+mediapipe::ImageFormat::Format GetImageFormat(int image_channels) {
+  if (image_channels == 4) {
+    return ImageFormat::SRGBA;
+  } else if (image_channels == 3) {
+    return ImageFormat::SRGB;
+  } else if (image_channels == 1) {
+    return ImageFormat::GRAY8;
+  }
+  LOG(FATAL) << "Unsupported input image channles: " << image_channels;
+}
+
+Packet MakeImageFramePacket(cv::Mat input, int timestamp) {
+  ImageFrame input_image(GetImageFormat(input.channels()), input.cols,
+                         input.rows, input.step, input.data, [](uint8*) {});
+  return MakePacket<ImageFrame>(std::move(input_image)).At(Timestamp(0));
+}
+
+Packet MakeImagePacket(cv::Mat input, int timestamp) {
+  mediapipe::Image input_image(std::make_shared<mediapipe::ImageFrame>(
+      GetImageFormat(input.channels()), input.cols, input.rows, input.step,
+      input.data, [](uint8*) {}));
+  return MakePacket<mediapipe::Image>(std::move(input_image)).At(Timestamp(0));
+}
+
+}  // namespace mediapipe

mediapipe/util/image_test_utils.h

@@ -0,0 +1,32 @@
+#ifndef MEDIAPIPE_UTIL_IMAGE_TEST_UTILS_H_
+#define MEDIAPIPE_UTIL_IMAGE_TEST_UTILS_H_
+
+#include <string>
+
+#include "mediapipe/framework/formats/image.h"
+#include "mediapipe/framework/packet.h"
+#include "mediapipe/framework/port/opencv_core_inc.h"
+
+namespace mediapipe {
+
+// Reads the image file into cv::Mat with RGB channels.
+cv::Mat GetRgb(const std::string& path);
+
+// Reads the image file into cv::Mat with RGBA channels.
+cv::Mat GetRgba(const std::string& path);
+
+// Reads the image file into cv::Mat with Gray channel.
+cv::Mat GetGray(const std::string& path);
+
+// Converts the image channels into corresponding ImageFormat.
+mediapipe::ImageFormat::Format GetImageFormat(int image_channels);
+
+// Converts the cv::Mat into ImageFrame packet.
+Packet MakeImageFramePacket(cv::Mat input, int timestamp = 0);
+
+// Converts the cv::Mat into Image packet.
+Packet MakeImagePacket(cv::Mat input, int timestamp = 0);
+
+}  // namespace mediapipe
+
+#endif  // MEDIAPIPE_UTIL_IMAGE_TEST_UTILS_H_