help me solve this error detectSURFFeatures

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i am having following sample code: I = imread('box.jpg'); points = detectSURFFeatures(I);
imshow(I); hold on;
i am getting this error:
Error using detectSURFFeatures
Expected input number 1, I, to be two-dimensional.
Error in detectSURFFeatures>parseInputs (line 130) validateattributes(I,{'logical', 'uint8', 'int16', 'uint16', ...
Error in detectSURFFeatures (line 81) [Iu8, params] = parseInputs(I,varargin{:});
Error in Untitled3 (line 2) points = detectSURFFeatures(I); pls help me solve this.

Accepted Answer

Dima Lisin
Dima Lisin on 12 Mar 2016
Edited: Dima Lisin on 12 Mar 2016
detectSURFFeatures only works on grayscale images. Use rgb2gray to convert I to grayscsle.
Dima Lisin
Dima Lisin on 13 Mar 2016
Edited: Dima Lisin on 13 Mar 2016
It is about the size. The image may look gray, but if its size is MxNx3, it is still RGB, as far as function is concerned.

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More Answers (1)

Anand on 12 Mar 2016
What does class(I) return? If it does not return one of the following, your image is not of the right type:
'logical', 'uint8', 'int16', 'uint16', 'single', 'double'
  1 Comment
india king
india king on 12 Mar 2016
it returns uint8.
Should i check for any additional installed packages?

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