I am learning C++ and OpenCV these days. Given an image, I want to extract its SIFT features. From http://docs.opencv.org/modules/nonfree/doc/feature_detection.html, we can know that OpenCV 2.4.8 h...

I am trying to run basic script found on a tutorial for object detection. I have tried everything I could find on web but failed to solve it. Already tried different suggested methods to convert im...

I'm trying a simple thing like detector = cv2.SIFT() and get this bad error detector = cv2.SIFT() AttributeError: 'module' object has no attribute 'SIFT' I do not understand that because cv2 ...

I know there is a lot of questions about Python and OpenCV but I didn't find help on this special topic. I want to extract SIFT keypoints from an image in python OpenCV. I have recently installed...

I am trying to run the simplest opencv SIFT code through the shell of Ubuntu, with no luck I get an error: AttributeError: 'module' object has no attribute 'SURF' The code: import cv2 cv2.SIF...

I am using Ubuntu 12.04. I recently installed OpenCV 3.0 from https://github.com/Itseez/opencv/archive/3.0.0-alpha.zip. I want to do feature matching for which I used the following code: import nu...

I am using OpenCV v4.20 and PyCharm IDE. I want to use SIFT algorithm. But I get this error. I looked for solutions of this error on the internet but none of them did help me. Do you know the solut...

Suppose I have a set of N images and I have already computed the SIFT descriptors of each image. I know would like to compute the matches between the different features. I have heard that a common ...

I try to use the SIFT and SURF function with some of the versions of OpenCV 3 and openCV 4 (after having installed opencv-contrib-python) with: pip install opencv-contrib-python i try versio...

I tried object detection for a couple of different objects both using David Lowe's implementation and OpenCV implementation (just changed 'SurfFeatureDetector' -> 'SiftFeatureDetector' and 'SurfDes...

I just discovered that SIFT writes the Octave as packed value (octave, layer and scale). I need this value unpacked since I have to use SIFT detector in combination with other descriptors (ORB, BRI...

I am working on a project in which the two images will be checked for similarity like 'Google Image Search by image'. I searched through Google and also on various sites including stackoverflow an...

I have OpenCV 3.0, and I have compiled & installed it with the opencv_contrib module so that's not a problem. Unfortunately the examples from previous versions do not work with the current one,...

Does someone know the link of example of SIFT implementation with OpenCV 2.2. regards,

I am trying to use FLANN with ORB descriptors, but opencv crashes with this simple code: vector<vector<KeyPoint> > dbKeypoints; vector<Mat> dbDescriptors; vector<Mat> objec...

I'm trying to use OpenCV to detect and extract ORB features from images. However, the images I'm getting are not normalized (different size, different resolutions, etc...). I was wondering if I n...

I'm trying to follow this tutorial with my own images.However, the results I get are not exeacty what I'd exepct. Am I missing something here, or is SIFT just not a good enough solution in this cas...

How can I draw a bounding box on best matches in BF MATCHER using Python?

I am getting an error: line 33, in <module> img3 = cv2.drawMatches(img1,kp1,img2,kp2,matches,None,flags=2) TypeError: Expected cv::DMatch for argument 'matches1to2' When I try to execute ...

I need to get the similarity score of two images, I'm using the SIFT Comparison, I've followed the tutorial Feature Matching but It's missing the score calculation. You'll find below the code That ...

I am using the SIFT implementation of Andrea Vedaldi, to calculate the sift descriptors of two images. But I would like to know if it is possible to predict where the object will be in next image, ...

I am trying to extract features from a rectangle image. But I want to ignore certain part of the image, so that no features are extracted from the these areas inside the image. I can think of two a...

I have an image of the target logo that I am trying to use to find target logos in other images. I am currently running two different detection algorithms to help me detect any logos on the image. ...

I have an issues with my swift application. I'm using UIWebview and I been getting the following error: [AVFigEndpointPickerOutputContextImpl sharedAudioPresentationOutputContext]: Audio present...

I am testing some object detection with SURF and SIFT. SURF claims to be faster and more robust than SIFT but I found in my test that this is not true. SIFT with medium images (600*400) is the sam...