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    %% Extract HOG Features Around Corner Points
%
%% 
% Read in the image of interest.
I2 = imread('gantrycrane.png');
%% 
% Detect and select the strongest corners in the image.
corners   = detectFASTFeatures(rgb2gray(I2));
strongest = selectStrongest(corners,3);
%% 
% Extract HOG features.
[hog2, validPoints,ptVis] = extractHOGFeatures(I2,strongest);
%% 
% Display the original image with an overlay of HOG features around the strongest corners.
figure;
imshow(I2);
hold on;
plot(ptVis,'Color','green');