minor fix of gpu performance sample

diff --git a/samples/gpu/performance/tests.cpp b/samples/gpu/performance/tests.cpp
index ddb77bb..e025d7d 100644 (file)
--- a/samples/gpu/performance/tests.cpp
+++ b/samples/gpu/performance/tests.cpp
@@ -929,7 +929,7 @@ TEST(GaussianBlur)
 \r
 TEST(filter2D)\r
 {\r
-    for (int size = 1000; size <= 4000; size += 1000)\r
+    for (int size = 512; size <= 2048; size *= 2)\r
     {\r
         Mat src;\r
         gen(src, size, size, CV_8UC4, 0, 256);\r