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Questions tagged [pose-estimation]

The specific task of determining the position and orientation of an object in an image relative to the camera coordinates is called Pose Estimation.

The pose of a camera is also known as the camera Extrinsic Parameters. It is a 3x4 matrix where the first 3 columns are the rotation (orientation) and the las column is the translation (position).

Camera Pose matrix. Rotation and Translation

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Mediapipe image pose estimation ERROR: No subgraph in the model CalculatorGraph::Run() failed in Run

I do like to estimate the pose from an image using MediaPipe, Following their Tutorial I'm getting this error: ERROR: No subgraph in the model CalculatorGraph::Run() failed in Run while doing that! This error appears in Ubuntu 20.04, boost 1.71,…
Bilal
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TENSORFLOW.JS 3D Pose Estimation is not working

Ive done a lot of Pose Estimation in Python using OpenCV and Mediapipe a year ago. I recently read an the Tensorflow Blog(https://blog.tensorflow.org/2021/08/3d-pose-detection-with-mediapipe-blazepose-ghum-tfjs.html) about the possibility of 3d Pose…
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Autoencoder - Reconstruction lacks color

My goal is to find unsupervised full body landmarks. For that purpose I am using an autoencoder structure to disentangle shape and appearance of full body images (deep fashion dataset). The loss function contains a reconstruction loss, which is…
spadel
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Estimating camera angles using homography

I've been trying to estimate the euler angles (Rotz(yaw)*Roty(pitch)*Rotx(roll)) of a UAV from the homography between two frames. This means that the rotation I get from each frame to the previous one has to be multiplied by the previous one to get…
Aquas
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Understanding openCV aruco marker detection/pose estimation in detail: subpixel accuracy

I am currently studying openCV's 'aruco' module, especially focusing on the poseEstimation of ArUco markers and AprilTags. Looking into the subpixel accuracy, I have encountered a strange behaviour, which is demonstrated by the code below: If I do…
chris
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How can I solvePnP with fisheye camera parameters?

I saw that OpenCV's solvePnP() function assume that your camera parameters are from a pinhole model. But I calibrated my camera using cv.fisheye module, so I wanted to know how to use solvePnP with parameters obtained from that fisheye module. How…
off99555
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In real_time_pose_estimation no errors but fails to detect the object

I am working on real time pose estimation and you can find the code here https://github.com/opencv/opencv/tree/master/samples/cpp/tutorial_code/calib3d/real_time_pose_estimation (samples given in opencv 3.1.0). It has two stages: model…
Joseph
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Image points (pixels) to real world coordinates (meters)

I have a fish-eye camera in the ceiling and I want to locate some points on the floor. I have put the origin of my reference system (real world) just below the camera and I want to know the position of every object in centimeters. This picture shows…
Jose L
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Extrinsic camera calibration OpenCV

I am attempting to calibrate the extrinsics of four cameras that I have mounted on a set-up. They are pointing 90 degrees apart. I have already calibrated the intrinsic paramteres, and I am thinking of using an image of a calibration pattern to find…
NoShadowKick
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Strange issue with stereo triangulation: TWO valid solutions

I am currently using OpenCV for a pose estimation related work, in which I am triangulating points between pairs for reconstruction and scale factor estimation. I have encountered a strange issue while working on this, especially in the opencv…
HighVoltage
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Model-based pose estimation

I would like to estimate the pose of know 3D object by using opencv. I can use solvePnP if the points of the 3D Model and their corresponded points at the image are given. My question is: how I can find the correspondence between the know 3D Model…
M.K.
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Is it possible to merge two Yolov7 models to inference in just one instance?

I have two Yolo v7 models (*.pt weights) that I need to merge: Pose estimation https://github.com/RizwanMunawar/yolov7-pose-estimation Model that detect helmets Is it possible to create a model from the weights of the models I am talking about? I…
Adrián Rodríguez
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How to get rotation matrix from camera perspective

I have a camera mounted on a post which is looking at a specific field. I know the exact real world position of the camera C and I know the exact size and real world position of the field P1, P2, P3, P4, W, H. The problem is that the camera may…
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Plot a 3D pose skeleton data in python from numerical dataset

I am working on a human pose prediction project, and I need to plot a human 3D pose skeleton from a numerical dataset, to compare ground truth and predicted values. like this image: Already I am using this simple code: ax =…
Wishii
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Is this a normal amount of instability for an ARUCO board estimation? (video example)

I'm trying to use ARUCO boards to assist with indoor robot navigation and I'm having trouble with the pose estimation Z axis flickering when the board is most head-on to the camera. Please see the issue here - watch how the blue axis flickers back…
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