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Questions tagged [keypoint]

In computer vision field a keypoint is an interest point detected by the SIFT algorithm. Use this tag for programming issues related to the use of keypoints in the field of computer vision.

is an algorithm that finds "keypoints" in images that are robust to scale variations, perspective and lighting. In order to identify those keypoints, descriptors are generated basing on the surrounding pixels of the keypoint. This way, the same keypoints can be located in different images, which is called matching.

Programing questions related to keypoints in computer vision applications are an appropriate field for this tag.

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Real time keypoint detection algorithm

I need to measure the speed a conveyor belt under a surveillance camera. After years of wearing the belt is basically texture-less, it's even difficult to see whether the belt is moving if nothing is on top it. I'm trying to solve this problem as an…
user416983
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A good way to use facial landmarks as input

We are planning to use facial landmark information as input to the model. Since there are more than 60 points, it doesn't look good to use 60 channels as inputs after one-hot encoding. I found a few papers with similar ideas, but I didn't like it.…
Hyelin
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Reshape output dimensions to fit Keras model

I have a Keras model for keypoints detection of a cat dataset. For each colored image, there are 3 key points with the corresponding 3 heatmaps. The input image of the model is 64,64,3 The corresponding output is of shape 3,64,64. I am preparing the…
Sara A. Fattouh
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Problem with NormalEstimation for finding Normals in PCL

I am trying to use Normal Estimation for finding normals at points in clouds so that I can pass it to the FPFH keypoint detector. Here is my code:- #include #include #include…
Ashwin
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TensorFlow.js PoseNet model keypoints animation

I'm using TensorFlow.js pre-trained PoseNet model to collect and store pose data from my web app. I already have some chunk of JSON with keypoints data I want to analyze to use it as training set for another neural network. Here's the keypoints data…
Alex Khristo
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Why we need to use RANSAC when we already match keypoints?

I am currently working on computer vision program that will stitch images together. I use KAZE algorithm for finding keypoints and describe them. Than I use Brute-force matcher to match them. From this stage I am ready to stitch them I think because…
RocK_st4r
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Remove key points from edges of an object

I am working with images with objects in it. I used canny edge detection and contours to detect and draw the edges of the objects in it. Then I used both SIFT and SURF to detect key points in the object. Here is the sample code I've been working on.…
Omar Sharif
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Problem stiching images from a drone with OpenCV due to a poor quality of the images

I am working with OpenCV and a quad ArDrone Parrot 2.0. I'm capturing the images from the bottom camera of the quad and I wish to stitch them in order to get a larger image. I'm trying to detect the squares marked in the images. I tried to perform…
Francisco Quarin
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Key point matching within one image

I am using open-cv with python for doing image processing stuff and have found plenty of examples of keypoint matching from two images. The image I'm working with has similar object in it and I am finding hard time to perform key point matching in…
Omar Sharif
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Key feature tracking in Open CV

How can I set my own custom feature points for tracking specific objects in video using OpenCV (Python)? So far I can find only face feature detection models, which are not customizable. Thank you
Pavlo Fiialkovskyi
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Keypoints detection and matching between binary masks

I am trying to match keypoints using opencv (tutorial) between images shown below. The thing is that I am not sure if I need to adjust some parameters or I am entirely using wrong method. Taking only right side of map.png did not help either. Here…
Benjamin
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How to make json's file like keypoint coco or MPII data

Hi I'm trying to create a medical image Keypoint Dataset. I don't know how to create a json file like "person_keypoints_train2014.json" of coco dataset? I tried some tools loike VGG Image Annotator with keypoint marks, but the lines to connect the…
kimdinhthai_bk
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sift detectandcompute get different size keypoint and descriptor,what is wrong?

Ptr detector = xfeatures2d::SIFT::create(); vector key_points_1, key_points_2; Mat dstImage1, dstImage2; detector->detectAndCompute(srcImage1, Mat(), key_points_1, dstImage1); I want to extract a image sift…
faithwang
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Check if KeyPoint is NULL

Is there a way in OpenCV to make a KeyPoint NULL or check if it is NULL? KeyPoint kp; kp = NULL; If (kp != NULL) { //... } Here is the global idea of the method I need this for : KeyPoint leastScoreKeyPoint; for (int i=0; i<100; i++) { …
Takichiii
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OpenCV wrong position off keypoints

I do not know what's wrong here, the points drawn from the function(cv2.drawMatchesKnn) are in a good position but points drawn from the loop are in a bad position. In the picture you can see it well. I know that there may be a small shift but it…
Ertryw
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