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# Tag Info

### How do monocular visual odometry algorithms work?

Monocular vision is a difficult and very interesting, particularly in its application to the general navigation problem. I will make an attempt at answering your questions, but if you find anything ...
• 926

Dead reckoning is determining pose (position and rotation) using speed estimates from sensors. For example, you know your initial position and use sensors such as encoder, accelerometers, gyros, etc......
• 345

### What's the difference between the term "pose estimation" and "visual odometry"?

It is also often the case that the author lacks knowledge, makes mistakes, or is adding unnecessary statements to their work. Just because it is published does not make it true. In this case though, ...
• 4,445

### What's the difference between the term "pose estimation" and "visual odometry"?

Pose estimation means determining position and orientation. Odometry is using a (any) sensor to determine how much distance has been traversed, so visual odometry is just clarification that the ...
• 16k
Accepted

### Problem understanding a paper about visual odometry

So SVO works a bit differently then other VO systems as it uses dense image alignment. You need to understand this concept first before understanding SVO. Look up Lucas and Kanade image alignment. The ...
• 1,871

### Wheel Odometry Covariance Matrix for Custom Robot

The covariance matrix of the control inputs is measured and known. That is, following the EKF equations on this page, the covariance of the control, $Q$ is (often) a diagonal matrix, where the ...
• 5,362

### Need help regarding odometry using Encoder motor and raspberry pi

You could maybe use Matlab to plot the position of your vehicle? This is how I'm trying to do that: I have a 'logging'-program running on the Raspberry Pi that counts each sampling time the pulses ...
• 155

### Need help regarding development of Extended Kalman Filter for sensor-data fusion of odometry and IMU data

Adding to the above, my favorite way to debug a misbehaving filter is to isolate each step. Make sure your prediction step works before correcting it. Your bot should drive straight right with 0,0,0 ...
• 5,362

### Public dataset for monocular visual odometry

http://vision.in.tum.de/data/datasets/rgbd-dataset This is a set of recordings for the Kinect and Asus Xtion pro, which are all indoors (in offices and a hangar). It comes with precise ground truth ...
• 176

### Public dataset for monocular visual odometry

This is another more recent one, based on the paper A Photometrically Calibrated Benchmark For Monocular Visual Odometry by Engel et al: http://vision.in.tum.de/data/datasets/mono-dataset This gives ...

### How to do odometry for 4 mecanum wheeled robot?

In order to transform encoder signals to robot motions a kinematic model of the robot is needed. In some cases this is very simple, just including the gear ratios and a heading angle (e.g. with ...
• 6,682

### [slam_toolbox]: Failed to compute odom pose

I can see the standard frame in slam_toolbox param file is base_footprint. See yaml-file. I can't see it in your tf.
• 56

### What is inverse depth (in odometry) and why would I use it?

In addition to the reasons mentioned in other answers about the numerical conditioning of inverse depth, a major reason for this term to appear in specifically visual odometry literature is in the way ...
• 324

### Mechanical odometer with digital output

The automotive industry frequently uses Hall effect sensors to measure shaft and gear rotation. The Hall effect has some beneficial properties: it operates over a wide range of temperatures, is more ...
• 4,396

### Need help regarding development of Extended Kalman Filter for sensor-data fusion of odometry and IMU data

You should first validate your filter is working before second-guessing your modelling choices. But I agree both those filters look OK (although I did not double check all the maths) and both of your ...
• 902

### Differential GPS or Simple GPS for Robot navigation and odometry?

Do not give up on encoders. They are a great complement to GPS. I don't know what precision you want to reach, or what terrain your robot will operate in, but wherever it will be, encoders will give ...
• 953
Accepted

### Markov Localization using control as an input

Multi-dimensional models In the 2D case, $x_t$ is a vector with two components (e.g. position in $x$, $y$), but why stop at 2D? Often, the state vector $x_t$ will have your position in two or three ...
• 450
Accepted

### Wheel odometry simulation using ground truth

You can't just take the ground truth states and get wheel encoder positions, or vice-versa, because the robot is nonholonomic. Nonholonomic is a fancy word that means "path dependent," essentially, ...
• 16k

### Encoder for odometry (Wheel vs motor)

Since it's the wheels which change the robot's pose in the environment, I'd suggest putting the encoders to the wheels. Especially if the motor and the wheel are only connected by a chain, introducing ...
Accepted

### Why the IMU measurements only accumulate drift in 4DOF

Correct, it's all about the gravity vector. I would argue that it is NOT necessarily possible to get the gravity vector out of the measurement, but that's because it's possible to put the IMU in a ...
• 16k

### Full 3D Pose (Scale, Rotation and Translation) Estimation using Gyro and Acceleromter sensors fusion

The packages you've found don't estimate scale or 3d pose because that's not really feasible using just an imu. The only way to get 3d pose from an imu is to integrate acceleration (adjusting for ...
• 2,814
Accepted

### How to properly initialize every new pose in a Visual SLAM algorithm (namely DSO)?

DSO initializes the scene and camera poses with a specific scale factor such that the average inverse depth of the pointHessians is one. After the initialization the first two frameHessians are led ...
• 36

### Lost on Graph slam's loop cloursure

The GraphSLAM algorithm from the paper you linked does not have a loop closure mechanism in the sense of a dedicated procedure for finding correspondences between landmarks observed at different nodes ...
• 331

### How can I calculate odometry given two poses?

Those POSEs are not 3D vectors or a 3D coordinate point. As such you can't subtract. A pose is a state vector, and the last value is an angle. From this, how can you calculate odometry?

### Odometry using wheel encoder with no differential drive

So long you have a sensor to read the angle of the steering wheel, you can use the bicycle kinematic model to compute odometry for an Ackermann drive platform, e.g. a car:  \begin{align} \\ \dot{x}...
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### How to actually fuse sensor using Extended Kalman Filter

I've never worked on Mecanum wheels before so I researched a bit. One of the first things I look for is there has to be a way to combine all of the encoder velocity measurements. Apparently, Jacobian ...
• 21
Accepted

### How to reset odom positions of robots while setting initial positions of robots in gazebo simulation through launch file

Usually, robot's float a topic (eg /mobile_base/commands/reset_odometry for TurtleBot) to reset the odometry. The URDF for the Rosbot2.0 uses Skid Steer plugin. ...
• 215

### odom frame behaves mischievously in rviz when Configuring Robot Localization with error message TF_OLD_DATA

If you are working on a real-robot, set use_sim_time to False for each node, otherwise set it to ...
1 vote

### EKF implementation on odometry/IMU

Try this dataset, Localization and Mapping Dataset. It will be helpful for your problem.
1 vote
Accepted

### Ackermann Motion Model Does not Drive in an Arc, but Turns on the Spot

The first ackermann model presented is based on dead reckoning, i.e. it needs wheel encoders. The ackermann model in edit 2 is based of velocity. It can be found here: https://pdfs.semanticscholar....
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