From c196e17ed66eab7c07202131f91b19399500b213 Mon Sep 17 00:00:00 2001
From: Jim Martens <github@2martens.de>
Date: Tue, 9 May 2017 15:50:39 +0200
Subject: [PATCH] [CVV] Added laplacian pyramid

Signed-off-by: Jim Martens <github@2martens.de>
---
 ccv/sheet5/CMakeLists.txt        |  2 +-
 ccv/sheet5/laplacian_pyramid.cpp | 11 +++++++++++
 ccv/sheet5/laplacian_pyramid.h   | 20 ++++++++++++++++++++
 3 files changed, 32 insertions(+), 1 deletion(-)
 create mode 100644 ccv/sheet5/laplacian_pyramid.cpp
 create mode 100644 ccv/sheet5/laplacian_pyramid.h

diff --git a/ccv/sheet5/CMakeLists.txt b/ccv/sheet5/CMakeLists.txt
index a9a45e6..27ae729 100644
--- a/ccv/sheet5/CMakeLists.txt
+++ b/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})
diff --git a/ccv/sheet5/laplacian_pyramid.cpp b/ccv/sheet5/laplacian_pyramid.cpp
new file mode 100644
index 0000000..11555ff
--- /dev/null
+++ b/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);
+  }
+}
diff --git a/ccv/sheet5/laplacian_pyramid.h b/ccv/sheet5/laplacian_pyramid.h
new file mode 100644
index 0000000..0f68e9d
--- /dev/null
+++ b/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