increase epsilons in some tests:

* MulSpectrums
* StereoConstantSpaceBP
* BruteForceNonLocalMeans

modules/cudaarithm/perf/perf_arithm.cpp

@@ -128,7 +128,7 @@ PERF_TEST_P(Sz_Flags, MulSpectrums,
 
         TEST_CYCLE() cv::cuda::mulSpectrums(d_a, d_b, dst, flag);
 
-        CUDA_SANITY_CHECK(dst);
+        CUDA_SANITY_CHECK(dst, 1e-6, ERROR_RELATIVE);
     }
     else
     {
@@ -162,7 +162,7 @@ PERF_TEST_P(Sz, MulAndScaleSpectrums,
 
         TEST_CYCLE() cv::cuda::mulAndScaleSpectrums(d_src1, d_src2, dst, cv::DFT_ROWS, scale, false);
 
-        CUDA_SANITY_CHECK(dst);
+        CUDA_SANITY_CHECK(dst, 1e-6, ERROR_RELATIVE);
     }
     else
     {

modules/cudastereo/test/test_stereo.cpp

@@ -163,7 +163,7 @@ CUDA_TEST_P(StereoConstantSpaceBP, Regression)
     cv::Mat h_disp(disp);
     h_disp.convertTo(h_disp, disp_gold.depth());
 
-    EXPECT_MAT_NEAR(disp_gold, h_disp, 1.0);
+    EXPECT_MAT_SIMILAR(disp_gold, h_disp, 1e-4);
 }
 
 INSTANTIATE_TEST_CASE_P(CUDA_Stereo, StereoConstantSpaceBP, ALL_DEVICES);

modules/photo/test/test_denoising.cuda.cpp

@@ -81,7 +81,7 @@ TEST(CUDA_BruteForceNonLocalMeans, Regression)
     cv::resize(bgr_gold, bgr_gold, cv::Size(256, 256));
     cv::resize(gray_gold, gray_gold, cv::Size(256, 256));
 
-    EXPECT_MAT_NEAR(bgr_gold, dbgr, 1e-4);
+    EXPECT_MAT_NEAR(bgr_gold, dbgr, 1);
     EXPECT_MAT_NEAR(gray_gold, dgray, 1e-4);
 }