increase epsilons for some sanity tests

modules/gpu/perf/perf_features2d.cpp

@@ -123,7 +123,7 @@ PERF_TEST_P(Image_NFeatures, Features2D_ORB,
 
         sortKeyPoints(gpu_keypoints, gpu_descriptors);
 
-        SANITY_CHECK_KEYPOINTS(gpu_keypoints);
+        SANITY_CHECK_KEYPOINTS(gpu_keypoints, 1e-10);
         SANITY_CHECK(gpu_descriptors);
     }
     else

modules/gpu/perf/perf_imgproc.cpp

@@ -1011,7 +1011,7 @@ PERF_TEST_P(Sz_Flags, ImgProc_MulSpectrums,
 
         TEST_CYCLE() cv::gpu::mulSpectrums(d_a, d_b, dst, flag);
 
-        GPU_SANITY_CHECK(dst);
+        GPU_SANITY_CHECK(dst, 2);
     }
     else
     {
@@ -1045,7 +1045,7 @@ PERF_TEST_P(Sz, ImgProc_MulAndScaleSpectrums,
 
         TEST_CYCLE() cv::gpu::mulAndScaleSpectrums(d_src1, d_src2, dst, cv::DFT_ROWS, scale, false);
 
-        GPU_SANITY_CHECK(dst);
+        GPU_SANITY_CHECK(dst, 1e-5);
     }
     else
     {

modules/gpu/perf/perf_video.cpp

@@ -340,8 +340,8 @@ PERF_TEST_P(ImagePair_WinSz_Levels_Iters, Video_PyrLKOpticalFlowDense,
 
         TEST_CYCLE() d_pyrLK.dense(d_frame0, d_frame1, u, v);
 
-        GPU_SANITY_CHECK(u);
-        GPU_SANITY_CHECK(v);
+        GPU_SANITY_CHECK(u, 0.5);
+        GPU_SANITY_CHECK(v, 0.5);
     }
     else
     {