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AttributeError: 'module' object has no attribute 'SURFcreate'I’ll be honest — this had me scratching my head at first. How am I supposed to access SIFT, SURF, and my other favorite keypoint detectors and local invariant descriptors ifcv2. FeatureDetectorcreate andcv2. DescriptorExtractorcreate have been removed?Thecv2. FeatureDetectorcreate andcv2.
DescriptorExtractorcreate were (and still are) methods I used all the time. And personally, I really liked the OpenCV 2.4.X implementation. All you needed to do was pass in a string and the factory method would build the instantiation for you. You could then tune the parameters using the getter and setter methods of the keypoint detector or feature descriptor.Furthermore, these methods have been part of OpenCV 2.4.X for many years. Why in the world were they removed from the default install? And where were they moved to?In the remainder of this blog post, I’ll detail why certain keypoint detectors and local invariant descriptors were removed from OpenCV 3.0 by default. And I’ll also show you where you can find SIFT, SURF, and other detectors and descriptors in the new version of OpenCV.
Why were SIFT and SURF removed from the default install of OpenCV 3.0?SIFT and SURF are examples of algorithms that OpenCV calls “non-free” modules. These algorithms are patented by their respective creators, and while they are free to use in academic and research settings, you should technically be obtaining a license/permission from the creators if you are using them in a commercial (i.e. For-profit) application.With OpenCV 3 came a big push to move many of these “non-free” modules out of the default OpenCV install and into the package.
Theopencvcontrib packages contains implementations of algorithms that are either patented or in experimental development.The algorithms and associated implementations inopencvcontrib are not installed by default and you need to explicitly enable them when compiling and installing OpenCV to obtain access to them.Personally, I’m not too crazy about this move.Yes, I understand including patented algorithms inside an open source library may raise a few eyebrows. But algorithms such as SIFT and SURF are pervasive across much of computer vision.
And more importantly, the OpenCV implementations of SIFT and SURF are used by academics and researchers daily to evaluate new image classification, Content-Based Image Retrieval, etc. By not including these algorithms by default, more harm than good is done (at least in my opinion). How do I get access to SIFT and SURF in OpenCV 3?To get access to the original SIFT and SURF implementations found in OpenCV 2.4.X, you’ll need to pull down both the and repositories from GitHub and then compile and install OpenCV 3 from source.Luckily, compiling OpenCV from source is easier than it used to be. I have gathered install instructions for Python and OpenCV for many popular operating systems over on the — just scroll down the Install OpenCV 3 and Python section and find the appropriate Python version (either Python 2.7+ or Python 3+) for your operating system. How do I use SIFT and SURF with OpenCV 3?So now that you have installed OpenCV 3 with theopencvcontrib package, you should have access to the original SIFT and SURF implementations from OpenCV 2.4.X, only this time they’ll be in thexfeatures2d sub-module through thecv2. SIFTcreate andcv2.
SURFcreate functions.To confirm this, open up a shell, import OpenCV, and execute the following commands (assuming you have an image namedtestimage. Jpg in your current directory, of course).
# kps: 361, descriptors: (361, 64)SummaryIn this blog post we learned that OpenCV has removed thecv2. FeatureDetectorcreate andcv2. DescriptorExtractorcreate functions from the library. Furthermore, the SIFT and SURF implementations have also been removed from the default OpenCV 3 install.The reason for SIFT and SURF removal is due to what OpenCV calls “non-free” algorithms. Both SIFT and SURF are patented algorithms, meaning that you should technically be getting permission to use them in commercial algorithms (they are free to use for academic and research purposes though).Because of this, OpenCV has made the decision to move patented algorithms (along with experimental implementations) to the package. This means that to obtain access to SIFT and SURF, you’ll need to compile and install OpenCV 3 from source withopencvcontrib support enabled.
Luckily, this isn’t too challenging with the help of my.Once you have installed OpenCV 3 withopencvcontrib support you’ll be able to find your favorite SIFT and SURF implementations in thexfeatures2d package through thecv2. SIFTcreate ( ) andcv2. SURFcreate ( ) functions. Hi Adrain, I have the same error, I followed your download steps and downloaded OpenCV 3.4.1. I am certain that I downloaded the same version of the contrib files and they unzipped correctly. Yet whenever I try a program that includes that includes anything like the code above or something like the code given in line 22 of the center of contour blog post I keep getting the same error:cnts = cnts0 if imutils.iscv2 else cnts1AttributeError: module ‘imutils’ has no attribute ‘iscv2’Any suggestions as I am unable to figure it out??
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If you are a customer of mine you will receive a guaranteed response from me. If there's any time left over, I focus on the community at large and attempt to answer as many of those questions as I possibly can.Thank you for keeping these guidelines in mind before submitting your comment. Thank you for the comment!I hand moderate all incoming questions to the PyImageSearch blog (typically once per week). Once your comment is approved it will show up on this page.In the meantime, here are a few suggestions to help you with your question:. Have you read the comments on this page? It's likely that I have already addressed your question in a previous comment. Additionally, try searching this page (i.e., ctrl + f) and search for keywords related to your question.
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Opencv Chessboard Detection
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I love offering these guides to you and I take pride in the content I create. Therefore, I will not approve comments that include large code blocks/terminal output as it destroys the formatting of this page. Kindly be respectful of this space. Have you checked my books and courses? I've written four separate books and courses which address the vast majority of Computer Vision, Deep Learning, and OpenCV questions you may have. Do you need priority support?
I place customer questions and emails in a separate, special priority queue and answer them first. If you are a customer of mine you will receive a guaranteed response from me. If there's any time left over, I focus on the community at large and attempt to answer as many of those questions as I possibly can.Thanks, and I look forward to helping you out!