fixed gpu::graphcut preconditions

modules/gpu/src/graphcuts.cpp

@@ -50,18 +50,22 @@ void cv::gpu::graphcut(GpuMat&, GpuMat&, GpuMat&, GpuMat&, GpuMat&, GpuMat&, Gpu
 
 void cv::gpu::graphcut(GpuMat& terminals, GpuMat& leftTransp, GpuMat& rightTransp, GpuMat& top, GpuMat& bottom, GpuMat& labels, GpuMat& buf)
 {
-    CV_Assert(leftTransp.type() == CV_32S && rightTransp.type() == CV_32S);
-    CV_Assert(terminals.type() == CV_32S && bottom.type() == CV_32S && top.type() == CV_32S);
-    CV_Assert(terminals.size() == leftTransp.size());
-    CV_Assert(terminals.size() == rightTransp.size());
-    CV_Assert(terminals.size() == top.size() && terminals.size() == bottom.size());
-    CV_Assert(top.step == bottom.step && top.step == terminals.step && rightTransp.step == leftTransp.step);
-
-    labels.create(terminals.size(), CV_8U);
+    Size src_size = terminals.size();
+    CV_Assert(terminals.type() == CV_32S);
+    CV_Assert(leftTransp.size() == Size(src_size.height, src_size.width));
+    CV_Assert(leftTransp.type() == CV_32S);
+    CV_Assert(rightTransp.size() == Size(src_size.height, src_size.width));
+    CV_Assert(rightTransp.type() == CV_32S);
+    CV_Assert(top.size() == src_size);
+    CV_Assert(top.type() == CV_32S);
+    CV_Assert(bottom.size() == src_size);
+    CV_Assert(bottom.type() == CV_32S);
+
+    labels.create(src_size, CV_8U);
 
     NppiSize sznpp;
-    sznpp.width = terminals.cols;
-    sznpp.height = terminals.rows;
+    sznpp.width = src_size.width;
+    sznpp.height = src_size.height;
 
     int bufsz;
     nppSafeCall( nppiGraphcutGetSize(sznpp, &bufsz) );