From b9d9ae72d7e372fc80ba87a05a49cb989ca1703a Mon Sep 17 00:00:00 2001
From: Jim Martens <github@2martens.de>
Date: Tue, 9 May 2017 15:37:46 +0200
Subject: [PATCH] [CVV] Added gaussian pyramid class from prev sheet

Signed-off-by: Jim Martens <github@2martens.de>
---
 ccv/sheet5/gauss_pyramid.cpp | 25 +++++++++++++++++++++++++
 ccv/sheet5/gauss_pyramid.h   | 18 ++++++++++++++++++
 2 files changed, 43 insertions(+)
 create mode 100644 ccv/sheet5/gauss_pyramid.cpp
 create mode 100644 ccv/sheet5/gauss_pyramid.h

diff --git a/ccv/sheet5/gauss_pyramid.cpp b/ccv/sheet5/gauss_pyramid.cpp
new file mode 100644
index 0000000..108f51b
--- /dev/null
+++ b/ccv/sheet5/gauss_pyramid.cpp
@@ -0,0 +1,25 @@
+#include "gauss_pyramid.h"
+
+gauss_pyramid::gauss_pyramid() {}
+
+gauss_pyramid::gauss_pyramid(cv::Mat img, float sigma, int number_of_layers)
+{
+  cv::Mat blurredImage;
+  cv::Mat resizedImage = img.clone();
+  for (int i = 0; i < number_of_layers; i++)
+  {
+    cv::GaussianBlur(resizedImage, blurredImage, cv::Size(0, 0), sigma, sigma, cv::BORDER_REPLICATE);
+    _layers.push_back(blurredImage.clone());
+    cv::resize(blurredImage, resizedImage, cv::Size(), 0.5, 0.5, cv::INTER_NEAREST);
+  }
+}
+
+cv::Mat gauss_pyramid::get(int layer)
+{
+  return _layers.at((unsigned long) layer);
+}
+
+unsigned long gauss_pyramid::get_number_of_layers()
+{
+  return _layers.size();
+}
diff --git a/ccv/sheet5/gauss_pyramid.h b/ccv/sheet5/gauss_pyramid.h
new file mode 100644
index 0000000..4583332
--- /dev/null
+++ b/ccv/sheet5/gauss_pyramid.h
@@ -0,0 +1,18 @@
+#ifndef SHEET3_GAUSS_PYRAMID_H
+#define SHEET3_GAUSS_PYRAMID_H
+
+#include <opencv2/opencv.hpp>
+
+class gauss_pyramid
+{
+private:
+    std::vector<cv::Mat> _layers;
+public:
+    gauss_pyramid();
+    gauss_pyramid(cv::Mat img, float sigma, int number_of_layers);
+    cv::Mat get(int layer);
+    unsigned long get_number_of_layers();
+};
+
+
+#endif //SHEET3_GAUSS_PYRAMID_H