accept multiple channels image for threshold on cuda

  * modify test, too

modules/cudaarithm/src/cuda/threshold.cu

@@ -101,10 +101,12 @@ double cv::cuda::threshold(InputArray _src, OutputArray _dst, double thresh, dou
 
     const int depth = src.depth();
 
-    CV_Assert( src.channels() == 1 && depth <= CV_64F );
+    CV_Assert( depth <= CV_64F );
     CV_Assert( type <= 4 /*THRESH_TOZERO_INV*/ );
 
     GpuMat dst = getOutputMat(_dst, src.size(), src.type(), stream);
+    src = src.reshape(1);
+    dst = dst.reshape(1);
 
     if (depth == CV_32F && type == 2 /*THRESH_TRUNC*/)
     {

modules/cudaarithm/test/test_element_operations.cpp

@@ -2532,11 +2532,12 @@ INSTANTIATE_TEST_CASE_P(CUDA_Arithm, AddWeighted, testing::Combine(
 CV_ENUM(ThreshOp, cv::THRESH_BINARY, cv::THRESH_BINARY_INV, cv::THRESH_TRUNC, cv::THRESH_TOZERO, cv::THRESH_TOZERO_INV)
 #define ALL_THRESH_OPS testing::Values(ThreshOp(cv::THRESH_BINARY), ThreshOp(cv::THRESH_BINARY_INV), ThreshOp(cv::THRESH_TRUNC), ThreshOp(cv::THRESH_TOZERO), ThreshOp(cv::THRESH_TOZERO_INV))
 
-PARAM_TEST_CASE(Threshold, cv::cuda::DeviceInfo, cv::Size, MatType, ThreshOp, UseRoi)
+PARAM_TEST_CASE(Threshold, cv::cuda::DeviceInfo, cv::Size, MatType, Channels, ThreshOp, UseRoi)
 {
     cv::cuda::DeviceInfo devInfo;
     cv::Size size;
     int type;
+    int channel;
     int threshOp;
     bool useRoi;
 
@@ -2545,8 +2546,9 @@ PARAM_TEST_CASE(Threshold, cv::cuda::DeviceInfo, cv::Size, MatType, ThreshOp, Us
         devInfo = GET_PARAM(0);
         size = GET_PARAM(1);
         type = GET_PARAM(2);
-        threshOp = GET_PARAM(3);
-        useRoi = GET_PARAM(4);
+        channel = GET_PARAM(3);
+        threshOp = GET_PARAM(4);
+        useRoi = GET_PARAM(5);
 
         cv::cuda::setDevice(devInfo.deviceID());
     }
@@ -2554,7 +2556,7 @@ PARAM_TEST_CASE(Threshold, cv::cuda::DeviceInfo, cv::Size, MatType, ThreshOp, Us
 
 CUDA_TEST_P(Threshold, Accuracy)
 {
-    cv::Mat src = randomMat(size, type);
+    cv::Mat src = randomMat(size, CV_MAKE_TYPE(type, channel));
     double maxVal = randomDouble(20.0, 127.0);
     double thresh = randomDouble(0.0, maxVal);
 
@@ -2570,7 +2572,8 @@ CUDA_TEST_P(Threshold, Accuracy)
 INSTANTIATE_TEST_CASE_P(CUDA_Arithm, Threshold, testing::Combine(
     ALL_DEVICES,
     DIFFERENT_SIZES,
-    testing::Values(MatType(CV_8UC1), MatType(CV_16SC1), MatType(CV_32FC1)),
+    testing::Values(MatDepth(CV_8U), MatDepth(CV_16S), MatDepth(CV_32F)),
+    ALL_CHANNELS,
     ALL_THRESH_OPS,
     WHOLE_SUBMAT));