imgproc(test): add bit-exact tests for YUV cvtColor conversions

modules/imgproc/test/test_color.cpp

@@ -2812,6 +2812,83 @@ TEST(Imgproc_ColorLuv_Full, bitExactness)
     }
 }
 
+
+static
+void runCvtColorBitExactCheck(ColorConversionCodes code, int inputType, uint32_t hash, Size sz = Size(263, 255), int rngSeed = 0)
+{
+    RNG rng(rngSeed);
+
+    Mat src(sz, inputType, Scalar::all(0));
+    Mat dst;
+    rng.fill(src, RNG::UNIFORM, 0, 255, true);
+
+    cv::cvtColor(src, dst, code);
+
+    uint32_t dst_hash = adler32(dst);
+
+    EXPECT_EQ(hash, dst_hash) << cv::format("0x%08llx", (long long int)dst_hash);
+
+    if (cvtest::debugLevel > 0)
+    {
+        const ::testing::TestInfo* const test_info = ::testing::UnitTest::GetInstance()->current_test_info();
+        CV_Assert(test_info);
+        std::string name = (std::string(test_info->test_case_name()) + "--" + test_info->name() + ".xml");
+        cv::FileStorage fs(name, cv::FileStorage::WRITE);
+        fs << "dst" << dst;
+    }
+}
+
+TEST(Imgproc_cvtColor_BE, COLOR_BGR2YUV) { runCvtColorBitExactCheck(COLOR_BGR2YUV, CV_8UC3, 0xc2cbcfda); }
+TEST(Imgproc_cvtColor_BE, COLOR_RGB2YUV) { runCvtColorBitExactCheck(COLOR_RGB2YUV, CV_8UC3, 0x4e98e757); }
+TEST(Imgproc_cvtColor_BE, COLOR_YUV2BGR) { runCvtColorBitExactCheck(COLOR_YUV2BGR, CV_8UC3, 0xb2c62a3f); }
+TEST(Imgproc_cvtColor_BE, COLOR_YUV2RGB) { runCvtColorBitExactCheck(COLOR_YUV2RGB, CV_8UC3, 0x6d242a3f); }
+
+// packed input
+TEST(Imgproc_cvtColor_BE, COLOR_YUV2RGB_NV12) { runCvtColorBitExactCheck(COLOR_YUV2RGB_NV12, CV_8UC1, 0x46a1bb76, Size(262, 510)); }
+TEST(Imgproc_cvtColor_BE, COLOR_YUV2BGR_NV12) { runCvtColorBitExactCheck(COLOR_YUV2BGR_NV12, CV_8UC1, 0x3843bb76, Size(262, 510)); }
+TEST(Imgproc_cvtColor_BE, COLOR_YUV2RGB_NV21) { runCvtColorBitExactCheck(COLOR_YUV2RGB_NV21, CV_8UC1, 0xf3fdf2ea, Size(262, 510)); }
+TEST(Imgproc_cvtColor_BE, COLOR_YUV2BGR_NV21) { runCvtColorBitExactCheck(COLOR_YUV2BGR_NV21, CV_8UC1, 0x6e84f2ea, Size(262, 510)); }
+TEST(Imgproc_cvtColor_BE, COLOR_YUV2RGBA_NV12) { runCvtColorBitExactCheck(COLOR_YUV2RGBA_NV12, CV_8UC1, 0xb6a16bd3, Size(262, 510)); }
+TEST(Imgproc_cvtColor_BE, COLOR_YUV2BGRA_NV12) { runCvtColorBitExactCheck(COLOR_YUV2BGRA_NV12, CV_8UC1, 0xa8436bd3, Size(262, 510)); }
+TEST(Imgproc_cvtColor_BE, COLOR_YUV2RGBA_NV21) { runCvtColorBitExactCheck(COLOR_YUV2RGBA_NV21, CV_8UC1, 0x1c7fa347, Size(262, 510)); }
+TEST(Imgproc_cvtColor_BE, COLOR_YUV2BGRA_NV21) { runCvtColorBitExactCheck(COLOR_YUV2BGRA_NV21, CV_8UC1, 0x96f7a347, Size(262, 510)); }
+TEST(Imgproc_cvtColor_BE, COLOR_YUV2RGB_YV12) { runCvtColorBitExactCheck(COLOR_YUV2RGB_YV12, CV_8UC1, 0xc5da1651, Size(262, 510)); }
+TEST(Imgproc_cvtColor_BE, COLOR_YUV2BGR_YV12) { runCvtColorBitExactCheck(COLOR_YUV2BGR_YV12, CV_8UC1, 0x12161651, Size(262, 510)); }
+TEST(Imgproc_cvtColor_BE, COLOR_YUV2RGB_IYUV) { runCvtColorBitExactCheck(COLOR_YUV2RGB_IYUV, CV_8UC1, 0xb4e62ea5, Size(262, 510)); }
+TEST(Imgproc_cvtColor_BE, COLOR_YUV2BGR_IYUV) { runCvtColorBitExactCheck(COLOR_YUV2BGR_IYUV, CV_8UC1, 0xfa632ea5, Size(262, 510)); }
+TEST(Imgproc_cvtColor_BE, COLOR_YUV2RGBA_YV12) { runCvtColorBitExactCheck(COLOR_YUV2RGBA_YV12, CV_8UC1, 0x0db4c69f, Size(262, 510)); }
+TEST(Imgproc_cvtColor_BE, COLOR_YUV2BGRA_YV12) { runCvtColorBitExactCheck(COLOR_YUV2BGRA_YV12, CV_8UC1, 0x59e1c69f, Size(262, 510)); }
+TEST(Imgproc_cvtColor_BE, COLOR_YUV2RGBA_IYUV) { runCvtColorBitExactCheck(COLOR_YUV2RGBA_IYUV, CV_8UC1, 0xfe09def3, Size(262, 510)); }
+TEST(Imgproc_cvtColor_BE, COLOR_YUV2BGRA_IYUV) { runCvtColorBitExactCheck(COLOR_YUV2BGRA_IYUV, CV_8UC1, 0x4395def3, Size(262, 510)); }
+TEST(Imgproc_cvtColor_BE, COLOR_YUV2GRAY_420) { runCvtColorBitExactCheck(COLOR_YUV2GRAY_420, CV_8UC1, 0xf672b440, Size(262, 510)); }
+
+TEST(Imgproc_cvtColor_BE, COLOR_YUV2RGB_UYVY) { runCvtColorBitExactCheck(COLOR_YUV2RGB_UYVY, CV_8UC2, 0x69bea2c1, Size(262, 510)); }
+TEST(Imgproc_cvtColor_BE, COLOR_YUV2BGR_UYVY) { runCvtColorBitExactCheck(COLOR_YUV2BGR_UYVY, CV_8UC2, 0xdc51a2c1, Size(262, 510)); }
+TEST(Imgproc_cvtColor_BE, COLOR_YUV2RGBA_UYVY) { runCvtColorBitExactCheck(COLOR_YUV2RGBA_UYVY, CV_8UC2, 0x851eab45, Size(262, 510)); }
+TEST(Imgproc_cvtColor_BE, COLOR_YUV2BGRA_UYVY) { runCvtColorBitExactCheck(COLOR_YUV2BGRA_UYVY, CV_8UC2, 0xf7b1ab45, Size(262, 510)); }
+
+TEST(Imgproc_cvtColor_BE, COLOR_YUV2RGB_YUY2) { runCvtColorBitExactCheck(COLOR_YUV2RGB_YUY2, CV_8UC2, 0x607e8889, Size(262, 510)); }
+TEST(Imgproc_cvtColor_BE, COLOR_YUV2BGR_YUY2) { runCvtColorBitExactCheck(COLOR_YUV2BGR_YUY2, CV_8UC2, 0xfb148889, Size(262, 510)); }
+TEST(Imgproc_cvtColor_BE, COLOR_YUV2RGB_YVYU) { runCvtColorBitExactCheck(COLOR_YUV2RGB_YVYU, CV_8UC2, 0x239b13d4, Size(262, 510)); }
+TEST(Imgproc_cvtColor_BE, COLOR_YUV2BGR_YVYU) { runCvtColorBitExactCheck(COLOR_YUV2BGR_YVYU, CV_8UC2, 0x402b13d4, Size(262, 510)); }
+TEST(Imgproc_cvtColor_BE, COLOR_YUV2RGBA_YUY2) { runCvtColorBitExactCheck(COLOR_YUV2RGBA_YUY2, CV_8UC2, 0xf6af910d, Size(262, 510)); }
+TEST(Imgproc_cvtColor_BE, COLOR_YUV2BGRA_YUY2) { runCvtColorBitExactCheck(COLOR_YUV2BGRA_YUY2, CV_8UC2, 0x9154910d, Size(262, 510)); }
+TEST(Imgproc_cvtColor_BE, COLOR_YUV2RGBA_YVYU) { runCvtColorBitExactCheck(COLOR_YUV2RGBA_YVYU, CV_8UC2, 0x14481c58, Size(262, 510)); }
+TEST(Imgproc_cvtColor_BE, COLOR_YUV2BGRA_YVYU) { runCvtColorBitExactCheck(COLOR_YUV2BGRA_YVYU, CV_8UC2, 0x30d81c58, Size(262, 510)); }
+TEST(Imgproc_cvtColor_BE, COLOR_YUV2GRAY_UYVY) { runCvtColorBitExactCheck(COLOR_YUV2GRAY_UYVY, CV_8UC2, 0x228e669c, Size(262, 510)); }
+TEST(Imgproc_cvtColor_BE, COLOR_YUV2GRAY_YUY2) { runCvtColorBitExactCheck(COLOR_YUV2GRAY_YUY2, CV_8UC2, 0x125c62fd, Size(262, 510)); }
+
+TEST(Imgproc_cvtColor_BE, COLOR_RGB2YUV_I420) { runCvtColorBitExactCheck(COLOR_RGB2YUV_I420, CV_8UC3, 0x44bb076a, Size(262, 254)); }
+TEST(Imgproc_cvtColor_BE, COLOR_BGR2YUV_I420) { runCvtColorBitExactCheck(COLOR_BGR2YUV_I420, CV_8UC3, 0xf908ff52, Size(262, 254)); }
+TEST(Imgproc_cvtColor_BE, COLOR_RGBA2YUV_I420) { runCvtColorBitExactCheck(COLOR_RGBA2YUV_I420, CV_8UC3, 0x44bb076a, Size(262, 254)); }
+TEST(Imgproc_cvtColor_BE, COLOR_BGRA2YUV_I420) { runCvtColorBitExactCheck(COLOR_BGRA2YUV_I420, CV_8UC3, 0xf908ff52, Size(262, 254)); }
+
+TEST(Imgproc_cvtColor_BE, COLOR_RGB2YUV_YV12) { runCvtColorBitExactCheck(COLOR_RGB2YUV_YV12, CV_8UC3, 0x1b0d076a, Size(262, 254)); }
+TEST(Imgproc_cvtColor_BE, COLOR_BGR2YUV_YV12) { runCvtColorBitExactCheck(COLOR_BGR2YUV_YV12, CV_8UC3, 0xda8aff52, Size(262, 254)); }
+TEST(Imgproc_cvtColor_BE, COLOR_RGBA2YUV_YV12) { runCvtColorBitExactCheck(COLOR_RGBA2YUV_YV12, CV_8UC3, 0x1b0d076a, Size(262, 254)); }
+TEST(Imgproc_cvtColor_BE, COLOR_BGRA2YUV_YV12) { runCvtColorBitExactCheck(COLOR_BGRA2YUV_YV12, CV_8UC3, 0xda8aff52, Size(262, 254)); }
+
+
 static void test_Bayer2RGB_EdgeAware_8u(const Mat& src, Mat& dst, int code)
 {
     if (dst.empty())