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17 votes

Why do people use camera instead of laser sensor for robot navigation?

A 3D laser range finder or LIDAR such as the one on the Google Car is far more expensive than a camera. The other reason is that while in case of a LIDAR the distance of every pixel is available, the ...
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7 votes
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What device do I need to project a laser to point at a specific location?

The underlying mechanism used by high performance laser painting devices is usually a galvo (Galvanometer scanner, Laser Galvanometer or Mirror Galvanometer). High performance galvos, like this one ...
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4 votes

Why do people use camera instead of laser sensor for robot navigation?

In addition to those points in Bence's answer, cameras can: Calculate many complex features that result in very robust matching between frames, and object recognition High angular resolution (typical ...
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3 votes

Why do people use camera instead of laser sensor for robot navigation?

navigation in urban environments Depending on the laser, there might be legal constraints on where you can use it. Running around town throwing laser rays around might require special permission/...
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3 votes
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Sensing the level of a liquid in a tube

If you look in the industry, they usually use capacitive proximity sensors. This sensors can be adjusted easily to sense behind the glass. In addition I can tell you, that this measurement is highly ...
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  • 1,647
3 votes
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Do simple, non-sonic, omni-directional rangefinding beacons exist?

Yes, there is such a system available today, ScenSor from DecaWave: These tags can measure their distance from base stations using the time of flight of radio packets. They have an precision of ...
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3 votes

A sensor that can see glass/transparent objects and surfaces

Unless you need very good resolution or a very tight detection pattern, I would go with an ultrasonic sensor. They can be very cheap and easily meet your detection range specs, for the very low end ...
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  • 1,909
3 votes
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A sensor that can see glass/transparent objects and surfaces

I'm pretty sure that a very basic IR proximity sensor would do the trick. Glass is opaque to all but visible light. IR (as well as UV) will not penetrate the glass and you ought to be getting reliable ...
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  • 1,027
2 votes

Do simple, non-sonic, omni-directional rangefinding beacons exist?

You could use AR markers attached to each robot or in known locations around the room. In fact, this is how it is typically done in research for indoor, multi-robot systems. The libraries for ...
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2 votes

Tracking Landspeed Underwater

Another sensor that you should investigate is ultra-short baseline (USBL). I have used the MicronNav with success in the past. You mentioned accelerometers, but what I think you really meant is an ...
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2 votes
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Using SLAM to create 2D topography

One way you can use SLAM in your setup is to stop the robot every 30 cm or so, and perform a sweep with your lidar. You can then use e.g. one of the 2D SLAM packages from openslam. The problem with ...
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2 votes
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Air hockey with a robot as an opponent

A well lit, perfectly circular object on a contrasting background, like a puck on an air hockey table, is pretty much the ideal use for webcam object tracking. A classic air hockey table has a light ...
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2 votes

Why do people use camera instead of laser sensor for robot navigation?

Like other already answered. Cameras typically are much cheaper than Laser Range Finders. When you talk about camera you mean the 2D cameras isn't it? There are some 3D cameras like the ifm O3D3xx ...
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2 votes

Resources for object detection with 2D Laser Scanner (planar only)

I think you can divide your problem into two subproblems: 1) Partition your 2D scan into segments/clusters which represent single objects. A basic algorithm could be: Start at first laser reading ...
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2 votes

What wavelengths are most commonly used in laser-scanners and LIDAR systems?

You are correct. Most Velodyne LIDARs (very commonly used on autonomous vehicles), use 905 nm diode lasers, and so do many Hokuyo laser scanners and SICK LIDARs. A new company, Ouster, uses 850 nm ...
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  • 1,091
2 votes

What wavelengths are most commonly used in laser-scanners and LIDAR systems?

Both 1550nm and 900nm ranges are used in different lidars. Velodyne and majority others use 905nm lasers because these diodes are really cheap. 1550nm are used when there is a need for very long ...
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  • 51
2 votes

How to detect loop closures in 2D laser SLAM?

The most traditional method is to keep looking at the trajectory and see if your current location is close enough to the previously visited place. Once this happens run the ICP. If ICP converged ...
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  • 1,375
2 votes
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Is there regulation of LiDAR in the public space?

The radiation produced by LiDARs is just light in a specific frequency. One way to think of it is a very focused very small flashlight which only puts out one color, that we can't quite see. That ...
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1 vote
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I want to know whether the Create2 can interface a LIDAR?

If you are willing to work at it, adding LIDAR to the Create 2 should be possible. If you read the iRobot Create 2 OI Specs, you will see that you can communicate with the Create via serial ...
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1 vote

Is it possible to detect road surface or navigation area using LRF data or other laser data in a Park?

Is it possible to detect road surface (not grass) using LRF data or other laser sensors? Yes it is possible. A laser scanner will give distance measurements along a scan line. Presumably, the road ...
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1 vote

Why do people use camera instead of laser sensor for robot navigation?

I don't think people really "want" to use only cameras. If every researcher could afford the LiDARs they'd all put LiDARs on they robots for outdoor environment. Cameras are pretty cheap and the ...
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1 vote

Why do people use camera instead of laser sensor for robot navigation?

Are there any advantages to using a LIDAR for SLAM vs a standard RGB camera? You may check this link where I have previously answered a somewhat similar question. (advantages and disadvantages of ...
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  • 309
1 vote

Inexpensive lidar/radar rangefinder good up to 100m?

Check this, starting from the last part: I think they are using the same technology as the several of their sensors: ( the one you mentioned) In the 100 dollar price range I think you will not find ...
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  • 309
1 vote
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Typical laser scanner noise values

I think 0.3m noise is a bit exaggerated for a scanning laser rangefinder. As you saw with the Hokuyo (which is one of the cheapest LIDARs you can get) they say that it is 0.03m range "error" (they do ...
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1 vote

Typical laser scanner noise values

Am I exaggerating with these values? No your're not but you need to filter the measurements. Also, you can double check datasheet of any laser sensor for the specifications. I've written a code for ...
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1 vote

Directly observing lidar laser rays

A digital camera, even on a cell phone will pick up the IR light. A darkened room will help it to show more prominently. No sense in buying any crazy equipment when the phone in your pocket will ...
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1 vote

Air hockey with a robot as an opponent

In addition to Chuck's answer: I recommend using opencv or any other Computer Vision library. But you do not need to go the simple way. Do not place the camera directly above the table. You can ...
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  • 1,647
1 vote

Turning an epilog laser into a 3d printer?

Anything's possible in the world of fabrication and computers, the question is how much time, effort, and money it will cost you. If you haven't built a 3D printer from scratch before, then it might ...
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1 vote

Tracking Landspeed Underwater

So this is really a hard task. Estimating the position of a AUV is still a large challenge even in research. There are sensors like as DVL (Doppler Velocity Log) available that can estimate the speed ...
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1 vote

Building parts, and keeping laser alignment steady

The two questions are quite unrelated so it would be best to ask two questions. Otherwise responds will probably fall short on one of them. About Q1: I understand that you are looking at using a ...
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