cudnn: added OpenCV libs to Linux build.

DataReader/ImageReader/ImageReader.cpp

@@ -432,6 +432,8 @@ bool ImageReader<ElemType>::GetMinibatch(std::map<std::wstring, Matrix<ElemType>
     {
         const auto& p = files[i + m_mbStart];
         cv::Mat img{ cv::imread(p.first, cv::IMREAD_COLOR) };
+        if (!img.data)
+            RuntimeError("Cannot read image file " + p.first);
         for (auto& t: m_transforms)
             t->Apply(img);
        

Makefile

@@ -405,9 +405,12 @@ IMAGEREADER:=$(LIBDIR)/ImageReader.so
 ALL += $(IMAGEREADER)
 SRC+=$(IMAGEREADER_SRC)
 
+INCLUDEPATH += $(OPENCV_PATH)/include
+LIBPATH += $(OPENCV_PATH)/release/lib
+
 $(IMAGEREADER): $(IMAGEREADER_OBJ) | $(CNTKMATH_LIB)
 	@echo $(SEPARATOR)
-	$(CXX) $(LDFLAGS) -shared $(patsubst %,-L%, $(LIBDIR) $(LIBPATH)) $(patsubst %,$(RPATH)%, $(ORIGINDIR) $(LIBPATH)) -o $@ $^ -l$(CNTKMATH)
+	$(CXX) $(LDFLAGS) -shared $(patsubst %,-L%, $(LIBDIR) $(LIBPATH)) $(patsubst %,$(RPATH)%, $(ORIGINDIR) $(LIBPATH)) -o $@ $^ -l$(CNTKMATH) -lopencv_core -lopencv_imgproc -lopencv_imgcodecs
 endif
 
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