MATLAB Answers

Unrecognized function or variable 'detectSIFTFeatures'

79 views (last 30 days)
Mary
Mary on 11 Oct 2021
Commented: Image Analyst on 22 Oct 2021
Hello friends.
I'm using matlab 2021a , but when I use command below:
points = detectSIFTFeatures(I);
It shows this error:
Unrecognized function or variable 'detectSIFTFeatures'

Answers (2)

Image Analyst
Image Analyst on 11 Oct 2021
You probably don't have the Computer Vision Toolbox.
% Check that user has the specified Toolbox installed and licensed.
% hasLicenseForToolbox = license('test', 'image_toolbox'); % Check for Image Processing Toolbox.
% hasLicenseForToolbox = license('test', 'Image_Acquisition_Toolbox'); % Check for Image Acquisition Toolbox.
% hasLicenseForToolbox = license('test', 'Statistics_Toolbox'); % Check for Statistics and Machine Learning Toolbox.
% hasLicenseForToolbox = license('test', 'Signal_Toolbox'); % Check for Signal Processing Toolbox.
hasLicenseForToolbox = license('test', 'Video_and_Image_Blockset'); % Check for Computer Vision Toolbox.
% hasLicenseForToolbox = license('test', 'Neural_Network_Toolbox'); % Check for Deep Learning Toolbox.
if ~hasLicenseForToolbox
% User does not have the toolbox installed, or if it is, there is no available license for it.
% For example, there is a pool of 10 licenses and all 10 have been checked out by other people already.
ver % List what toolboxes the user has licenses available for.
message = sprintf('Sorry, but you do not seem to have the Computer Vision Toolbox.\nDo you want to try to continue anyway?');
reply = questdlg(message, 'Toolbox missing', 'Yes', 'No', 'Yes');
if strcmpi(reply, 'No')
% User said No, so exit.
return;
end
end
What does the above code say? Also do
>> ver
Do you see the Computer Vision Toolbox listed?
  9 Comments
Image Analyst
Image Analyst on 22 Oct 2021
Try to crop them and align them with imregister() so you're looking at the same field of view.

Sign in to comment.


yanqi liu
yanqi liu on 12 Oct 2021
sir,may be you should use vlfeat to get sift points, of course,you can use surf,such as
clc; clear all; close all;
I = imread('cameraman.tif');
points = detectSURFFeatures(I);
imshow(I); hold on;
plot(points.selectStrongest(10));

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by