reformat image compare into video directory

common/BUILD

@@ -105,15 +105,4 @@ cc_test(
     "@bs_thread_pool",
     "@com_google_googletest//:gtest_main",
   ],
-)
-
-cc_library(
-    name = "video",
-    hdrs = ["video.hh"],
-    srcs = ["video.cc"],
-    deps = [
-        "@eigen",
-        "@opencv",
-    ],
-    visibility = ["//visibility:public"]
 )

common/video/BUILD

@@ -0,0 +1,21 @@
+package(features=["warning_compile_flags"])
+
+cc_library(
+  name = "image_compare",
+  hdrs = ["image_compare.hh"],
+  srcs = ["image_compare.cc"],
+  deps = [
+    "@eigen//:eigen",
+    "@opencv",
+  ],
+  visibility = ["//visibility:public"],
+)
+
+cc_test(
+  name = "image_compare_test",
+  srcs = ["image_compare_test.cc"],
+  deps = [
+    ":image_compare",
+    "@com_google_googletest//:gtest_main",
+  ]
+)

common/video.cc → common/video/image_compare.cc

@@ -1,6 +1,6 @@
 #include "opencv2/opencv.hpp"
 
-namespace robot::common {
+namespace robot::common::video {
 
 bool images_equal(const cv::Mat& img1, const cv::Mat& img2) {
     if (img1.size() != img2.size() || img1.type() != img2.type()) {
@@ -12,4 +12,4 @@ bool images_equal(const cv::Mat& img1, const cv::Mat& img2) {
     return cv::countNonZero(diff) == 0;
 }
 
-}  // namespace robot::common
+}  // namespace robot::common::video

common/video.hh → common/video/image_compare.hh

@@ -2,7 +2,7 @@
 
 #include "opencv2/opencv.hpp"
 
-namespace robot::common {
+namespace robot::common::video {
 
 bool images_equal(const cv::Mat& img1, const cv::Mat& img2);
 

common/video/image_compare_test.cc

@@ -0,0 +1,31 @@
+#include "common/video/image_compare.hh"
+#include "opencv2/opencv.hpp"
+#include <gtest/gtest.h>
+
+namespace robot::common::video {
+
+TEST(ImageCompareTest, ImagesEqual_SameImages) {
+    cv::Mat img1 = cv::Mat::zeros(100, 100, CV_8UC3);
+    cv::Mat img2 = img1.clone();
+    EXPECT_TRUE(images_equal(img1, img2));
+}
+
+TEST(ImageCompareTest, ImagesEqual_DifferentSizes) {
+    cv::Mat img1 = cv::Mat::zeros(100, 100, CV_8UC3);
+    cv::Mat img2 = cv::Mat::zeros(200, 200, CV_8UC3);
+    EXPECT_FALSE(images_equal(img1, img2));
+}
+
+TEST(ImageCompareTest, ImagesEqual_DifferentTypes) {
+    cv::Mat img1 = cv::Mat::zeros(100, 100, CV_8UC3);
+    cv::Mat img2 = cv::Mat::zeros(100, 100, CV_8UC1);
+    EXPECT_FALSE(images_equal(img1, img2));
+}
+
+TEST(ImageCompareTest, ImagesEqual_DifferentContent) {
+    cv::Mat img1 = cv::Mat::zeros(100, 100, CV_8UC3);
+    cv::Mat img2 = cv::Mat::ones(100, 100, CV_8UC3);
+    EXPECT_FALSE(images_equal(img1, img2));
+}
+
+}  // namespace robot::common::video