All Questions
15 questions
1
vote
2
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243
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Switching between 2 cameras (using opencv)
I have a manipulator in ROS and 2 cameras attached on it.
I want to switch the frames of cameras every 5 seconds
Both cameras work fine.
I do not want to close the window and reopen it (if it is ...
- 11
1
vote
2
answers
130
views
Detecting door blockage using computer vision
I want to detect door blockage on a camera. Basically if the exit door is blocked by an object, it detects it as an anomaly. How can we do it? Is it possible to do it using OpenCV?
Remember, it doesn’...
- 111
1
vote
2
answers
122
views
Vision programming with OpenCV
I am currently working on a project on NiryoOne which requires facial detection of a person through NiryoOne camera (ELP SONY IMX).
The code that I am using works on my laptop running Ubuntu. However, ...
- 11
1
vote
2
answers
118
views
Reflective surface
Have you encountered the problem of reflective surfaces for realsense camera (d435 or t265) and lidar (A1 or A2). I would like to know what are the ways to solve problems with reflective surfaces for ...
- 11
0
votes
1
answer
46
views
Trouble aligning/calibrating camera with laser scanner
I have a robot which has 2 multi-spectral cameras and 1 laser scanner attached. In the end I would like to have the images from the cameras aligned with the scanner so that I can have spectral ...
- 101
0
votes
1
answer
407
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How to find visual odometry by video from cellphone camera mounted on robot?
I am writing codes in python for visual odometry from single camera. I used cell phone camera for testing. I took video of 35 sec with camera moving. I used code below to read first image
...
1
vote
0
answers
101
views
Interpreting results from Camera Calibration?
I used OpenCV's findChessboardCorners on a few checkerboard images (40~) and about 27 seemed to find the corners accurately. How does one proceed from here? Do I calculate the reprojection error over ...
- 161
3
votes
1
answer
2k
views
Trigger two usb cameras at the same time
I'm studyng stereo cameras, and I want to build one. I searched a lot in internet, and the opinions are quite different about this topic.
Basically, my question is:
Can I synchronize two usb ...
3
votes
1
answer
1k
views
OpenCV get topdown view of planar pattern by using intrinsic and extrinsic from cameraCalibrate
Originally I have a image with a perfect circle grid, denoted as A
I add some lens distortion and perspective transformation to it, and it becomes B
In camera calibration, A would be my destination ...
- 151
1
vote
0
answers
40
views
Are homogeneous coordinates represented by appending image coordinates with a 1 in camera imaging
In camera imaging, there are several terms for point coordinates.
World coordinates: [X, Y, Z] in physical unit
Image coordinates: [u, v] in pixel.
Do these coordinates become homogeneous ...
- 273
0
votes
1
answer
5k
views
normalized point coordinates in undistortPoints function
In undistortPoints function from OpenCV, the documentations says that
http://docs.opencv.org/2.4/modules/imgproc/doc/geometric_transformations.html#undistortpoints
where undistort() is an ...
- 273
4
votes
1
answer
1k
views
Image registration with ground plane for surround view
I am currently working on a project which which involves surround view.
I have 4 fish eye cameras and are fixed at 4 sides of a car.The fish eye cameras are corrected for radial distortion.
After ...
- 171
4
votes
1
answer
2k
views
Scale problem with monocular visual odometry
Is monocular visual odometry able to estimate relative scale? Say I have a sequence of 10 images that are taken on a single track each 1 m after the previous. Can some mono odometry method distinguish ...
- 643
4
votes
2
answers
1k
views
Stereo Camera calibration with different camera types
I'm trying to perform stereo camera calibration, rectification and disparity map generation. It's working fine with normal sample data. However, I'm trying to use the dual cameras on an iPhone 7+, ...
- 141
3
votes
2
answers
147
views
Suggestions on object types (features) to track from ARDrone 2 camera
UPDATE
I have aded 50 bounty for this question on the StackOverflow
I am trying to implement object tracking from the camera(just one camera, no Z info). Camera has 720*1280 resolution, but I ...
- 185