help me solve this error detectSURFFeatures

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india king
india king 2016-3-12
编辑： Dima Lisin 2016-3-13
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 2016-3-12
编辑：Dima Lisin 2016-3-12
detectSURFFeatures only works on grayscale images. Use rgb2gray to convert I to grayscsle.
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india king
india king 2016-3-13
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 2016-3-13
编辑：Dima Lisin 2016-3-13
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 2016-3-12
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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