It depends on the application (some are not real time), but you did not give context.
By the way, the disparity is linked to the base size, but also to the focal length (longer focal = narrower field of view = biggest disparity for the same z)
Search found 215 matches
- Sun Apr 05, 2020 12:32 pm
- Forum: The art of stereoscopic photo
- Topic: Low Profile (staggered) Stereovision?
- Replies: 10
- Views: 26420
- Sun Apr 05, 2020 12:21 pm
- Forum: OpenCV, Python and other image processing
- Topic: Faster framerate
- Replies: 9
- Views: 18770
Re: Faster framerate
It's a quick answer without checking anything, but have you considered the capture_continuous function of picamera which seems to be more or less written for the kind of application you have:
https://picamera.readthedocs.io/en/rele ... continuous
https://picamera.readthedocs.io/en/rele ... continuous
- Sun Apr 05, 2020 11:57 am
- Forum: Video, photo (livestream, recording, photo capturing)
- Topic: A physical button to take photos
- Replies: 37
- Views: 83768
Re: A physical button to take photos
You can connect it in several ways, the goal is to have a high impedance (i.e. open circuit) in general and a GND (0V) briefly to take the photo. The code has a rudimentary (but sufficient in this context) debouncing so that you can connect the button without additional electronical hardware. When I...
- Mon Mar 30, 2020 12:36 pm
- Forum: Video, photo (livestream, recording, photo capturing)
- Topic: SLP update discussion
- Replies: 14
- Views: 15639
Re: SLP update discussion
You already have the possibility to set 1080@60 To reduce the risk of bad parameters, proposing presets might be a good idea, but I wish the advanced options would still be accessible some way. Also, maybe it would be better to have the whole configuration in a separated page in multiple columns — I...
- Mon Mar 30, 2020 12:30 pm
- Forum: StereoPi hardware
- Topic: Genlock
- Replies: 10
- Views: 8430
Re: Genlock
Yes, I did not add this precision because it was too obvious to me to think about it. I talked about artifacts that are not reflections, for example in some flying droplets.
- Mon Mar 30, 2020 12:21 pm
- Forum: The art of stereoscopic photo
- Topic: Low Profile (staggered) Stereovision?
- Replies: 10
- Views: 26420
Re: Low Profile (staggered) Stereovision?
Sure. As I said, it is not in the context of real time depth extraction (it took several tens of seconds on a 4GHz processor, monothread). I only pointed out that, although the signal is small, it is present in the image. The signal is smaller and smaller when your subject is placed farther away. Of...
- Mon Mar 30, 2020 12:14 pm
- Forum: OpenCV, Python and other image processing
- Topic: Broken Stereoscopic Support in Raspbian Stretch
- Replies: 4
- Views: 7049
Re: Broken Stereoscopic Support in Raspbian Stretch
I (quickly) answer only to the first part.
The -3d option needs a value, see https://forum.stereopi.com/viewtopic.php?f=11&t=43 for example.
Doc: https://www.raspberrypi.org/documentati ... /camera.md
The -3d option needs a value, see https://forum.stereopi.com/viewtopic.php?f=11&t=43 for example.
Doc: https://www.raspberrypi.org/documentati ... /camera.md
- Sun Mar 29, 2020 11:33 pm
- Forum: StereoPi hardware
- Topic: Genlock
- Replies: 10
- Views: 8430
Re: Genlock
I had a bit of time today to shoot even if it was cloudy, cold and windy and that I had only the V1 cameras available. I realized that I use a crapy SD card and that can be what causes the issue (settings were in the capabilities of the cameras in the first test), so I lowered the video options. So ...
- Sun Mar 29, 2020 10:45 pm
- Forum: Video, photo (livestream, recording, photo capturing)
- Topic: SLP update discussion
- Replies: 14
- Views: 15639
Re: SLP update discussion
Today, I thought that perhaps you could also add the "classical" 24/25/50 fps video framerates in the selection menu.
- Fri Mar 27, 2020 3:56 pm
- Forum: Other software
- Topic: Mounting image to check original parameters
- Replies: 3
- Views: 15387
Mounting image to check original parameters
Today, I wanted to get the default parameters of StereoPi. I downloaded the image file and here is a tip to avoid to burn it, thanks to Linux. With fdisk, we can get the organisation of the partitions in the image: $ fdisk -l stereopi-0-2-3.img Disk stereopi-0-2-3.img: 1.9 GiB, 2013265920 bytes, 393...
- Fri Mar 27, 2020 2:37 pm
- Forum: The art of stereoscopic photo
- Topic: Low Profile (staggered) Stereovision?
- Replies: 10
- Views: 26420
Re: Low Profile (staggered) Stereovision?
It's interesting, but I do not have time to think about this in details. If you try it, let us know. As Realizator, I doubt it would let you gain base size because you would have somehow to project one of your images into the reference of the second one. Furthermore, you would probably have some unw...
- Tue Mar 24, 2020 6:50 pm
- Forum: StereoPi hardware
- Topic: Genlock
- Replies: 10
- Views: 8430
Re: Genlock
Hi Oteppi, I never really used the video record part of SLP (which is the preinstalled system on StereoPi) and I have some trouble to use it. The videos I did yesterday were swapped (and there was a very strange delay between the cameras as if the processing was not able to follow the capture rate)....
- Tue Mar 24, 2020 6:41 am
- Forum: Video, photo (livestream, recording, photo capturing)
- Topic: SLP update discussion
- Replies: 14
- Views: 15639
Re: SLP update discussion
I would add that it would be nice to have a button to record a video more easily, like the photo button does.
It would be even better if this button show the current recording state.
It would be even better if this button show the current recording state.
- Mon Mar 23, 2020 12:46 pm
- Forum: Video, photo (livestream, recording, photo capturing)
- Topic: SLP improvement: multiple wifi networks configured
- Replies: 1
- Views: 4170
SLP improvement: multiple wifi networks configured
Observed in version 0.2.3 of SLP I usually connect my stereopi to home WiFi network (to easily work on it with the computer) and mobile-phone WiFi network (for in-field control). However, SLP allows to store the ids of only one of these networks at a time. By modifying the scripts, it is possible to...
- Mon Mar 23, 2020 12:21 pm
- Forum: Video, photo (livestream, recording, photo capturing)
- Topic: SLP improvement: 404 in file manager
- Replies: 1
- Views: 3405
SLP improvement: 404 in file manager
Observed in version 0.2.3 of SLP Using the "File manager" icon on the webpage, the "open" link of a file detail page points to the wrong URL. The preview of a JPG has broken source URL as well. To reproduce: take a photo, use the file manager to navigate to /media/DCIM/<photoname>, click on open lin...
- Sat Mar 21, 2020 7:23 am
- Forum: StereoPi hardware
- Topic: Genlock
- Replies: 10
- Views: 8430
Re: Genlock
I know what you are talking about. In practice, the sync error with StereoPi is by very far inferior to the framerate, so that the kind of problems you mention do not show up. I'll try to capture a demo video with moving things so that you could check by yourself. Ask me again in a few days if I for...
- Fri Mar 20, 2020 8:55 am
- Forum: StereoPi hardware
- Topic: 3D scanning with structured light
- Replies: 2
- Views: 4860
Re: 3D scanning with structured light
It looks like the OpenCV library has a module to deal with this: https://docs.opencv.org/master/d3/d81/tutorial_structured_light.html I do not know how to use it in practice, but it is probably a good starting point. Perhaps is there software or high level libraries built on top of this library. As ...
- Fri Mar 20, 2020 8:41 am
- Forum: StereoPi hardware
- Topic: Genlock
- Replies: 10
- Views: 8430
Re: Genlock
As far as I understand, not strictly speaking. However in practice the cameras are scanned with very low latency. In this post , a user shared videos taken from a plane drone. The vibrations of the machine interfere with the rolling-shutter of the camera and the resulting artifacts (image "wobbling"...
- Mon Mar 09, 2020 7:21 am
- Forum: Cameras and video capture modules
- Topic: Getting video only from single camera
- Replies: 1
- Views: 5142
Re: Getting video only from single camera
What system do you use?
What command do you use?
It might be missing parameters in the command but give us more information.
What command do you use?
It might be missing parameters in the command but give us more information.
- Fri Mar 06, 2020 8:18 am
- Forum: StereoPi hardware
- Topic: Left and Right Cameras Reversed
- Replies: 9
- Views: 9562
Re: Left and Right Cameras Reversed
The left and right cameras depends on how you bend the ribbons, even without crossing them.
Changing the primary camera (-cs 1) or mirroring the images (-vf -hf) are two valid options you can use also on raspbian flavor as soon as you use raspistill or raspivid.
Changing the primary camera (-cs 1) or mirroring the images (-vf -hf) are two valid options you can use also on raspbian flavor as soon as you use raspistill or raspivid.