Update: Added HOG feature extraction with visualization

Test.m

 %% Example Title
 % Let's use Edvard Munch's - skrik picture
-image = imread("colorHistogram/Edvard_Munch_-_Despair_(1894).jpg");
+img = imread("colorHistogram/Edvard_Munch_-_Despair_(1894).jpg");
 
 % Let's also display the picture to see how it originally looks
 %imshow(image);
 %% edgeMap - Test of implementation
-edgeImage = edgeMap(image);
+%edgeImage = edgeMap(img);
 
-imshow(edgeImage);
+%imshow(edgeImage);
 
+%% HOG - Test of implementation
+% "hog" contains feature vector based on histogram of oriented gradients
+% "visual" contains visualization object that can be used in plot method
+[hog, visual] = histogramOrientedGradients(img);
 
+figure,
+imshow(img),
+hold on,
+plot(visual),
+title("Hog features of image");
+
+% Using Cellsize this time
+[hog2, visual2] = histogramOrientedGradients(img, 32);
+
+figure,
+imshow(img),
+hold on,
+plot(visual2),
+title("Hog features using Cellsize");
 %% Section 2 Title
 % Description of second code block
 b = 2;

histogramGrayscale.m

 %Returns histogram in grayscale
 function [out] = histogramGrayscale(image)
-    %image ideally is already grayscaled rbg2gray() if needed
+    %Converts image into grayscale
+    image = rgb2gray(image);
     
     [x,y] = size(image);
     out = zeros(1,255);

histogramOrientedGradients.m

+% Returns histogram of oriented gradients (HOG) feauture vector of an
+% image and visualization object that can be used with plot method.
+% Useful for training a classifier.
+%
+% NB! *Requires Computer Vision Toolbox Add-on*
+%
+function [featureVector, hogVisualization] = histogramOrientedGradients(varargin)
+    if nargin==1
+        img=varargin{1};
+        [featureVector, hogVisualization] = extractHOGFeatures(img);
+    elseif nargin==2
+        img=varargin{1};
+        size=varargin{2};
+        [featureVector, hogVisualization] = extractHOGFeatures(img, "Cellsize",[size size]);
+    else
+      error('histogramOrientedGradients only accepts up to 2 input arguments!')
+    end
+end
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