how to get two-dimensional matrix from an generated image using frame2im

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Peter
Peter 2016-12-1
[image, Map] = frame2im(m(1));
points = detectSURFFeatures(image);
There is an error about the incorrect input for the detectSURFFeatures function. image contains 367x575x3 uint8 but the function only accept m by n matrix as input, how can I only get 367x575 from image?
Thanks

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