help me solve this error detectSURFFeatures

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india king
india king il 12 Mar 2016
Modificato: Dima Lisin il 13 Mar 2016
i am having following sample code: I = imread('box.jpg'); points = detectSURFFeatures(I);
imshow(I); hold on;
plot(points.selectStrongest(10));
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.

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Dima Lisin
Dima Lisin il 12 Mar 2016
Modificato: Dima Lisin il 12 Mar 2016
detectSURFFeatures only works on grayscale images. Use rgb2gray to convert I to grayscsle.
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india king
india king il 13 Mar 2016
thank you.It worked. although the image was in grayscale i had to convert it once againg using rgb2gray fn and the code works now.
Dima Lisin
Dima Lisin il 13 Mar 2016
Modificato: Dima Lisin il 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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Anand
Anand il 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'
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india king
india king il 12 Mar 2016
it returns uint8.
Should i check for any additional installed packages?

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