From fdba6da5f75c6f7e2bb613e4143f8004ce4f7b9d Mon Sep 17 00:00:00 2001
From: Jim Martens <github@2martens.de>
Date: Fri, 4 Nov 2016 13:34:03 +0100
Subject: [PATCH] =?UTF-8?q?[BV]=20=C3=9Cbung=203=20Bearbeitung=20hinzugef?=
 =?UTF-8?q?=C3=BCgt?=
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Signed-off-by: Jim Martens <github@2martens.de>
---
 bv/uebung3.m | 42 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100644 bv/uebung3.m

diff --git a/bv/uebung3.m b/bv/uebung3.m
new file mode 100644
index 0000000..128c291
--- /dev/null
+++ b/bv/uebung3.m
@@ -0,0 +1,42 @@
+% histogram distances
+rice = imread('rice.png');
+cam = imread('cameraman.tif');
+rice_sp = imnoise(rice, 'salt & pepper', 0.02);
+rice_g = imnoise(rice, 'gaussian');
+[h1,] = imhist(rice);
+[h2,] = imhist(cam);
+[h3,] = imhist(rice_sp);
+[h4,] = imhist(rice_g);
+dist_rice_camera = pdist2(h1', h2');
+dist_rice_rice_sp = pdist2(h1', h3');
+dist_rice_rice_g = pdist2(h1', h4');
+distman_rice_camera = pdist2(h1', h2', 'cityblock');
+distman_rice_rice_sp = pdist2(h1', h3', 'cityblock');
+distman_rice_rice_g = pdist2(h1', h4', 'cityblock');
+% colour spaces
+peppers = imread('peppers.png');
+peppers_gray = rgb2gray(peppers);
+peppers_hsv = rgb2hsv(peppers);
+peppers_lab = rgb2lab(peppers);
+%figure (1), imhist(peppers(:, :, 1));
+%figure (2), imhist(peppers(:, :, 2));
+%figure (3), imhist(peppers(:, :, 3));
+%figure (4), imshow(peppers_hsv);
+%figure (5), imshow(peppers_lab);
+%figure (6), imshow(peppers);
+% binary images
+coins = imread('coins.png');
+coins_bw = coins;
+for i = 1 : numel(coins_bw)
+    if coins_bw(i) < 90
+        coins_bw(i) = 0;
+    else
+        coins_bw(i) = 1;
+    end
+end
+coins_bw_l = logical(coins_bw);
+level = graythresh(coins);
+coins_bw_mat = imbinarize(coins, level);
+figure (1), imhist(coins);
+figure (2), imshow(coins_bw_l);
+figure (3), imshow(coins_bw_mat);