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20 views

Depth images with undetectable outlines

I'm trying to capture depth images with a RGBD camera, but all of the images have undetectable outlines around objects: Is this expected from RGBD cameras or is mine a dud? It's an Astra Pro.
0
votes
0answers
97 views

estimate accuracy of (aruco) marker position tracking

I'm planning a concept for calibrating a robot model. For this purpose I want to use computer vision approaches. Since I'm not that experienced in that field I have some basic questions on the ...
1
vote
1answer
57 views

What is the relation between FOV, Focal Length and Sensor size in a Pin hole Camera Model?

I aim to recreate the camera parameters of my camera in the Unity rendering system, which has the following variables: 1) I tweaked the focal length and saw that the Field of View is changing (...
2
votes
0answers
21 views

Is it possible to calculate a homography matrix for any 2 views?

I've been experimenting with opencv to estimate the homography matrix between 2 images captured with my computer's webcam. I have noticed that when the 2 views are not very far apart (that's when I ...
0
votes
1answer
57 views

vision guided robotic arm always required 6d pose of object? [closed]

I have an object like attached in image. It is hanging vertical (its position may change but static object) and I want to grasp it using 6DOF Robotic arm. I am Using camera to detect object. I am ...
3
votes
1answer
82 views

Short range stereo vision

I am designing a stereo vision system for short depth range (15 cm to 35 cm) and I have some problems about baseline, focal length and depth range. My application is to scan an animal tissue (meat, ...
1
vote
0answers
90 views

robot Hand Eye Calibration problem

I am trying to understand the implementations and the relative performance of various classical and new Hand-eye calibration approaches. Note: The following discussion assumes implementations are in ...
3
votes
2answers
74 views

Question about Lens distortion

Suppose I have a 240x180 camera with the following distortion co-efficients, $$k_1 = -0.138592767408$$ $$k_2=0.0933736664192$$ $$k_3=0.0$$ $$p_1=k_4=-0.000335586987532$$ $$p_2=k_5=0.000173720158228$$ ...
1
vote
0answers
42 views

Algorithm for orientation (pan/tilt) towards a moving point

Main Question: note: The code in this question is pseudo-code, I'm using Python, but my pseudo-code is a mix of Python and C++. I have a camera on the top of my robot's "head" which has pan and tilt ...
5
votes
1answer
115 views

Can you find object distance using camera pose

I have bounding boxes detected in RGB images, but no information about the camera's intrinsic properties. Using deep learning (preferably) can I find the distance to the object from the camera in real ...
2
votes
2answers
125 views

Smart camera image processing on embedded GPU vs. in the cloud

I'm working on a smart camera that does key point prediction (predicting locations of wrists, elbow, shoulder, ears, eyes, nose, etc.) for gesture recognition. Right now, the neural net is running on ...
3
votes
1answer
261 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 ...
3
votes
1answer
397 views

How to eliminate motion blur with realtime performance

I have a robotic system to develop, in first phase of the project I need to track an object. So I placed a geometrical marker on the object to estimate it's pose (rotation, translation). It all works ...
0
votes
1answer
3k 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 ...
2
votes
1answer
571 views

Correct Fish eye camera radial distortion and blurry stretch at the image edges

There are a lot of questions regarding this topic, but I am trying to get a more clear picture from these questions. I am trying to calibrate a fish eye camera and I am using OpenCV ...
0
votes
1answer
300 views

setup requirement of stereo camera

In the stereo camera system, two cameras are needed and should be mounted side by side. I see someone just glues two cameras to a wooden board. However one mobile phone manufacture claimed that the ...
2
votes
1answer
51 views

Is there a better way to deal with untextured regions in stereo matching

Texture is very helpful for stereo matching. However in real environment, untextured areas always exit. Consistent semi-global matching is proposed to deal with untextured regions. I start to read the ...
2
votes
2answers
367 views

Using Standard Digital camera for Computer Vision

For a University project I have to use computer vision to detect small drones within 40 feet. I know there exists a pixycam for this purpose, but I was not happy with it, when I used it for CV. I ...
0
votes
1answer
118 views

Can I use a FTC regulation phone to use the camera on multiple tasks?

PREFACE: THIS QUESTION REGARDS FTC ROBOTICS I am aware that a question similar to this exists on SE and I have looked at it, but the solutions provided did not solve my problem, and the nature of my ...
4
votes
1answer
521 views

Stereo camera vs. one camera for player detection & ball tracking in basketball scenes?

There are a number of similar questions such as Monocular vs. stereo computer vision robustness for object detection, but none that address my question specifically. My weekend project is to build a ...
5
votes
2answers
5k views

Difference between 3D Camera(using IR projection) and Stereo Camera?

I am currently busy with a final year project which requires me to track people walking through a doorway. I initially thought this may be possible using a normal camera and using some motion ...
2
votes
1answer
2k views

Perspective n Point - RPnP algorithm

I need to caculate the pose of a camera using an image of an artificial landmkark. For this porpouse I am trying to use the Perspective n Point approach so I can calculate it using the intrinsic ...
1
vote
0answers
24 views

Is the distortion introduced by a lens protector significant in practice?

I have a computer-vision application I made to localize a robot in a room; the software has been in use for a while and is working fine. When I calibrated the camera and got the intrinsics and lens ...
2
votes
2answers
3k views

Using an RGB + Depth Camera to locate X,Y,Z coordinates of a ball

I've recently been trying to use Gazebo to do some modelling for a couple tasks. I have a robot that's effectively able to locate a ball and get x,y coordinates in terms of pixels using a simple RGB ...
3
votes
3answers
1k views

Real-time video processing on video feed from a drone's camera

I am working on a project where I want to run some computer vision algorithms (e.g. face recognition) on the live video stream coming from a flying drone. There are many commercial drones out there ...
2
votes
1answer
612 views

Suggestion for a camera [closed]

Are there good low cost cameras that are frequently used in robotics? I am assuming there are cameras that are good fit for robotics ... Works well with OpenCV PC Windows support - USB2/USB3 (GigE, ...
8
votes
2answers
93 views

Conceptual problem regarding electronic shutters

I have been looking at CCD and CMOS sensors and cameras to decide which one to use in the process of automatic control of a printing process. By now I am getting the grips on almost all the essential ...
1
vote
0answers
55 views

Depth of view for a hypercatadioptric camera

I am trying to determine the depth of view for a hypercatadioptric camera (camera lens system and a hyperbolic mirror) based on 1. The following illustration seems pretty clear. For an image point $...
6
votes
6answers
2k views

Low power computer for stereo vision

I would like to build a motorized robot with stereo vision that sends visual input to a PC over wifi for processing. A Raspberry Pi would have been perfect for the task if it would be possible to ...
2
votes
1answer
16k views

How can I interface my CMOS camera module to an Arduino? [closed]

I am totally new to the camera interface and usage in an Embedded project, and would like to use a CMOS vision sensor like this.This project further will be used to power a small robot with on-board ...
4
votes
1answer
4k views

Transform Image Using Roll-Pitch-Yaw Angles (image rectification)

UPDATE: This exact problem has been solved in StackOverflow. Please read this post there for further explanation and a working solution. Thanks! I am working on an application where I need to rectify ...
18
votes
4answers
12k views

How to select cameras for a stereo vision system?

I am in the process of building a stereo vision system to be used on a UGV. The system is for a robot that will be used in a competition wherein the robot is teleoperated to find relatively small ...