From 16ef01efdaa7bd13ad0a63f138dc8d705b9dcf68 Mon Sep 17 00:00:00 2001
From: Marina Kolpakova <no@email>
Date: Wed, 6 Jun 2012 16:05:31 +0000
Subject: [PATCH] set to linear interpolation type for upscaling with area
 interplation flag

---
 modules/gpu/perf/perf_imgproc.cpp     | 2 +-
 modules/gpu/perf_cpu/perf_imgproc.cpp | 2 +-
 modules/gpu/src/cuda/resize.cu        | 3 +++
 3 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/modules/gpu/perf/perf_imgproc.cpp b/modules/gpu/perf/perf_imgproc.cpp
index 3a714c2ee..b261ad086 100644
--- a/modules/gpu/perf/perf_imgproc.cpp
+++ b/modules/gpu/perf/perf_imgproc.cpp
@@ -88,7 +88,7 @@ INSTANTIATE_TEST_CASE_P(ImgProc, Resize, testing::Combine(
                     MatType(CV_32FC1), MatType(CV_32FC3), MatType(CV_32FC4)),
     testing::Values(Interpolation(cv::INTER_NEAREST), Interpolation(cv::INTER_LINEAR),
                     Interpolation(cv::INTER_CUBIC),   Interpolation(cv::INTER_AREA)),
-    testing::Values(Scale(0.5), Scale(0.3)/*, Scale(2.0)*/)));
+    testing::Values(Scale(0.5), Scale(0.3), Scale(2.0))));
 
 //////////////////////////////////////////////////////////////////////
 // WarpAffine
diff --git a/modules/gpu/perf_cpu/perf_imgproc.cpp b/modules/gpu/perf_cpu/perf_imgproc.cpp
index 68f38afa0..9fe9fd07a 100644
--- a/modules/gpu/perf_cpu/perf_imgproc.cpp
+++ b/modules/gpu/perf_cpu/perf_imgproc.cpp
@@ -78,7 +78,7 @@ INSTANTIATE_TEST_CASE_P(ImgProc, Resize, testing::Combine(
                     MatType(CV_32FC1), MatType(CV_32FC3), MatType(CV_32FC4)),
     testing::Values(Interpolation(cv::INTER_NEAREST), Interpolation(cv::INTER_LINEAR),
                     Interpolation(cv::INTER_CUBIC),   Interpolation(cv::INTER_AREA)),
-    testing::Values(Scale(0.5), Scale(0.3)/*, Scale(2.0)*/)));
+    testing::Values(Scale(0.5), Scale(0.3), Scale(2.0))));
 
 //////////////////////////////////////////////////////////////////////
 // WarpAffine
diff --git a/modules/gpu/src/cuda/resize.cu b/modules/gpu/src/cuda/resize.cu
index e1694db0c..a51c04306 100644
--- a/modules/gpu/src/cuda/resize.cu
+++ b/modules/gpu/src/cuda/resize.cu
@@ -241,6 +241,9 @@ namespace cv { namespace gpu { namespace device
                 ResizeDispatcher<CubicFilter, T>::call,
                 ResizeDispatcher<AreaFilter, T>::call
             };
+            // chenge to linear if area interpolation upscaling
+            if (interpolation == 3 && (fx <= 1.f || fy <= 1.f))
+                interpolation = 1;
 
             callers[interpolation](static_cast< DevMem2D_<T> >(src), static_cast< DevMem2D_<T> >(srcWhole), xoff, yoff, fx, fy, 
                 static_cast< DevMem2D_<T> >(dst), stream);