extracthogfeatures is not working in R2011a. Is it the version error or command error?

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I1 = imread('gantrycrane.png');
I2=im2double(I1);
[hog1, visualization] = extractHOGFeatures(I2,'CellSize',[32 32]);
subplot(1,2,1);
imshow(I2);
subplot(1,2,2);
plot(visualization);
??? Undefined function or method 'extractHOGFeatures' for input arguments of type 'double'.

Answers (2)

Image Analyst
Image Analyst on 20 Mar 2015
Type ver to see if you have the Computer Vision System Toolbox - I'm not sure it existed yet in that R2011a version. Otherwise, this is a good excuse to upgrade your 4 year old version to the latest version.
  3 Comments
Image Analyst
Image Analyst on 20 Mar 2015
I don't have that toolbox. Is extractHOGFeatures a built in function or some custom function someone gave you? Try this:
which -all extractHOGFeatures
What does it say?

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Dima Lisin
Dima Lisin on 20 Mar 2015
extractHOGFeatures was introduced in R2013b.
  2 Comments
Shreya Bareja
Shreya Bareja on 21 Mar 2015
But if have the Computer Vision System Toolbox would extracthogfeatures still be non-functional?
Image Analyst
Image Analyst on 21 Mar 2015
Why would it be? It's not even there in the R2011a version that you have. Like Dima said, that function was introduced in R2013b, even though you may have an earlier version of the toolbox. So you don't have it.

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