[CVV] Added laplacian pyramid

Signed-off-by: Jim Martens <github@2martens.de>

ccv/sheet5/CMakeLists.txt

@@ -5,5 +5,5 @@ set(CMAKE_CXX_STANDARD 11)
 
 find_package( OpenCV REQUIRED )
 
-add_executable(sheet5 main.cpp)
+add_executable(sheet5 gauss_pyramid.cpp laplacian_pyramid.cpp main.cpp)
 target_link_libraries(sheet5 ${OpenCV_LIBS})

ccv/sheet5/laplacian_pyramid.cpp

@@ -0,0 +1,11 @@
+#include "laplacian_pyramid.h"
+
+laplacian_pyramid::laplacian_pyramid(const gauss_pyramid &pyramid, float sigma) {
+  _layers = std::vector<cv::Mat>();
+  unsigned long number_of_layers = pyramid.get_number_of_layers();
+  for (int i = 0; i < number_of_layers; i++) {
+    cv::Mat blurred;
+    cv::GaussianBlur(pyramid.get(i), blurred, cv::Size(), sigma, sigma, cv::BORDER_CONSTANT);
+    _layers.push_back(blurred);
+  }
+}

ccv/sheet5/laplacian_pyramid.h

@@ -0,0 +1,20 @@
+#ifndef SHEET5_LAPLACIAN_PYRAMID_H
+#define SHEET5_LAPLACIAN_PYRAMID_H
+
+#include <opencv2/opencv.hpp>
+#include "gauss_pyramid.h
+
+class laplacian_pyramid {
+private:
+    std::vector<cv::Mat> _layers;
+public:
+    /**
+     * Initializes the laplacian pyramid.
+     * @param pyramid the gaussian pyramid
+     * @param sigma the blur factor
+     */
+    laplacian_pyramid(const gauss_pyramid& pyramid, float sigma);
+};
+
+
+#endif //SHEET5_LAPLACIAN_PYRAMID_H