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

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?

Answer 1

[Geoff Hayes]

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.

[Robert Schneider]

Im getting a similar error with the computer vision toolbox. Im running 2014a, and says stereoAnaglyph not found when i type which stereoAnaglyph -all. Why am I getting this issue, I have the license, working for all my other CV functions.

[Image Analyst]

Show us what it says when you type "ver" on the command line. Delete your license number before posting back here.

[Robert Schneider]

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]

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.

Answer 2

[Deborah]

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?

[Geoff Hayes]

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.

Answer 3

[Fatma Buharoon]

If I am having 2015b version free trail why can't I use computer vision toolbox or how can install it with this free trail ??

[Walter Roberson]

You need to specifically request the toolboxes you want to trial at the time you get the trial.

Not all toolboxes are installed by default; you may need to go into the MATLAB installer and request that the toolbox be installed.