Computer Vision - Undefined function 'detectSURFFeatures' for input arguments of type 'uint8'.

Question

Deborah 2014-7-25

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https://ww2.mathworks.cn/matlabcentral/answers/143325-computer-vision-undefined-function-detectsurffeatures-for-input-arguments-of-type-uint8

评论： Walter Roberson 2016-2-22

When I am trying to follow the Computer Vision Toolbox tutorial with the following code, I am getting the error

Undefined function 'detectSURFFeatures' for input
arguments of type 'uint8'.
>> imshow(TextDetectionExample_01)
>> I = rgb2gray(TextDetectionExample_01);
>> points= detectSURFFeatures(I);
Undefined function 'detectSURFFeatures' for input
arguments of type 'uint8'.

I have Computer Vision installed onto my computer, so am wondering why this is happening? Can anyone help?

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Answer 1

Geoff Hayes 2014-7-25

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https://ww2.mathworks.cn/matlabcentral/answers/143325-computer-vision-undefined-function-detectsurffeatures-for-input-arguments-of-type-uint8#answer_146397

Deborah - in the Command Window, type which detectSURFFeatures -all to locate the function. If it doesn't exist, you will see a 'detectSURFFeatures' not found message.

Which version of MATLAB are you running? In the Command Window, type ver and check the MATLAB version.

Based on Computer Vision System Toolbox Release Notes, the detectSURFFeatures was introduced in R2011b.

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Robert Schneider 2015-3-23

编辑：Walter Roberson 2016-2-22

在 MATLAB Online 中打开

MATLAB Version: 8.3.0.532 (R2014a)
Operating System: Mac OS X  Version: 10.10.2 Build: 14C1514 
Java Version: Java 1.7.0_71-b14 with Oracle Corporation Java HotSpot(TM) 64-Bit Server VM mixed mode
MATLAB                                                Version 8.3        (R2014a)
Simulink                                              Version 8.3        (R2014a)
Computer Vision System Toolbox                        Version 6.0        (R2014a)
Control System Toolbox                                Version 9.7        (R2014a)
DSP System Toolbox                                    Version 8.6        (R2014a)
Image Processing Toolbox                              Version 9.0        (R2014a)
Instrument Control Toolbox                            Version 3.5        (R2014a)
Optimization Toolbox                                  Version 7.0        (R2014a)
Signal Processing Toolbox                             Version 6.21       (R2014a)
Simulink Control Design                               Version 4.0        (R2014a)
Statistics Toolbox                                    Version 9.0        (R2014a)
Symbolic Math Toolbox                                 Version 6.0        (R2014a)

Robert Schneider 2015-3-23

I see that the functions were released in a later version. I guess when u buy new toolboxes, you are actually buying old software based on what your original version is.

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Answer 2

Deborah 2014-7-25

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https://ww2.mathworks.cn/matlabcentral/answers/143325-computer-vision-undefined-function-detectsurffeatures-for-input-arguments-of-type-uint8#answer_146398

Thanks Geoff, that's helpful! I'm getting % Has no license available, so am guessing that though I have the toolboxes installed, I do not have the appropriate licence - is that right?

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Geoff Hayes 2014-7-25

Or maybe you share licenses with other people at wherever you are (work, school, etc.)? If there is a limited number of licenses available then maybe you have to wait until someone else releases it before you can start using that toolbox.

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