fixed some bugs, added tests for gpu::HOGDescriptor

modules/gpu/include/opencv2/gpu/gpu.hpp

@@ -282,7 +282,7 @@ namespace cv
             operator GpuMat() const;
 
             //returns if host memory can be mapperd to gpu address space;
-            static bool can_device_map_to_host();
+            static bool canMapHostMemory();
 
             // Please see cv::Mat for descriptions
             bool isContinuous() const;
@@ -1001,8 +1001,6 @@ namespace cv
                                   double hit_threshold=0, Size win_stride=Size(), Size padding=Size(),
                                   double scale0=1.05, int group_threshold=2);
 
-            GpuMat getLastBlockHists() const;
-
             Size win_size;
             Size block_size;
             Size block_stride;

modules/gpu/src/cuda/hog.cu

@@ -142,6 +142,7 @@ __global__ void compute_hists_kernel_many_blocks(const int img_block_width, cons
     const float* grad_ptr = grad.ptr(offset_y) + offset_x * 2;
     const unsigned char* qangle_ptr = qangle.ptr(offset_y) + offset_x * 2;
 
+    // 12 means that 12 pixels affect on block's cell (in one row)
     if (cell_thread_x < 12)
     {
         float* hist = hists + 12 * (cell_y * blockDim.z * CELLS_PER_BLOCK_Y + 

modules/gpu/src/hog.cpp

@@ -295,11 +295,6 @@ void cv::gpu::HOGDescriptor::detectMultiScale(const GpuMat& img, vector<Rect>& f
 }
 
 
-cv::gpu::GpuMat cv::gpu::HOGDescriptor::getLastBlockHists() const {
-    return block_hists;
-}
-
-
 int cv::gpu::HOGDescriptor::numPartsWithin(int size, int part_size, int stride) 
 {
     return (size - part_size + stride) / stride;

modules/gpu/src/matrix_operations.cpp

@@ -68,7 +68,7 @@ namespace cv
         void GpuMat::release() { throw_nogpu(); }
 
         void CudaMem::create(int /*_rows*/, int /*_cols*/, int /*_type*/, int /*type_alloc*/) { throw_nogpu(); }
-        bool CudaMem::can_device_map_to_host() { throw_nogpu(); return false; }
+        bool CudaMem::canMapHostMemory() { throw_nogpu(); return false; }
         void CudaMem::release() { throw_nogpu(); }
         GpuMat CudaMem::createGpuMatHeader () const { throw_nogpu(); return GpuMat(); }
     }