Search found 135 matches

by stereomaton
Sun Apr 05, 2020 12:32 pm
Forum: The art of stereoscopic photo
Topic: Low Profile (staggered) Stereovision?
Replies: 9
Views: 72

Re: Low Profile (staggered) Stereovision?

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)
by stereomaton
Sun Apr 05, 2020 12:21 pm
Forum: OpenCV, Python and other image processing
Topic: Faster framerate
Replies: 7
Views: 571

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
by stereomaton
Sun Apr 05, 2020 11:57 am
Forum: Video, photo (livestream, recording, photo capturing)
Topic: A physical button to take photos
Replies: 24
Views: 2750

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...
by stereomaton
Mon Mar 30, 2020 12:36 pm
Forum: Video, photo (livestream, recording, photo capturing)
Topic: SLP update discussion
Replies: 5
Views: 71

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...
by stereomaton
Mon Mar 30, 2020 12:30 pm
Forum: StereoPi hardware
Topic: Genlock
Replies: 10
Views: 155

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.
by stereomaton
Mon Mar 30, 2020 12:21 pm
Forum: The art of stereoscopic photo
Topic: Low Profile (staggered) Stereovision?
Replies: 9
Views: 72

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...
by stereomaton
Sun Mar 29, 2020 11:33 pm
Forum: StereoPi hardware
Topic: Genlock
Replies: 10
Views: 155

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 ...
by stereomaton
Sun Mar 29, 2020 10:45 pm
Forum: Video, photo (livestream, recording, photo capturing)
Topic: SLP update discussion
Replies: 5
Views: 71

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.
by stereomaton
Fri Mar 27, 2020 3:56 pm
Forum: Other software
Topic: Mounting image to check original parameters
Replies: 1
Views: 12

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...
by stereomaton
Fri Mar 27, 2020 2:37 pm
Forum: The art of stereoscopic photo
Topic: Low Profile (staggered) Stereovision?
Replies: 9
Views: 72

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...
by stereomaton
Tue Mar 24, 2020 6:50 pm
Forum: StereoPi hardware
Topic: Genlock
Replies: 10
Views: 155

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)....
by stereomaton
Tue Mar 24, 2020 6:41 am
Forum: Video, photo (livestream, recording, photo capturing)
Topic: SLP update discussion
Replies: 5
Views: 71

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.
by stereomaton
Mon Mar 23, 2020 12:46 pm
Forum: Video, photo (livestream, recording, photo capturing)
Topic: SLP improvement: multiple wifi networks configured
Replies: 0
Views: 26

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...
by stereomaton
Mon Mar 23, 2020 12:21 pm
Forum: Video, photo (livestream, recording, photo capturing)
Topic: SLP improvement: 404 in file manager
Replies: 1
Views: 30

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...
by stereomaton
Sat Mar 21, 2020 7:23 am
Forum: StereoPi hardware
Topic: Genlock
Replies: 10
Views: 155

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...
by stereomaton
Fri Mar 20, 2020 8:55 am
Forum: StereoPi hardware
Topic: 3D scanning with structured light
Replies: 2
Views: 105

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 ...
by stereomaton
Fri Mar 20, 2020 8:41 am
Forum: StereoPi hardware
Topic: Genlock
Replies: 10
Views: 155

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"...
by stereomaton
Mon Mar 09, 2020 7:21 am
Forum: Cameras and video capture modules
Topic: Getting video only from single camera
Replies: 1
Views: 643

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.
by stereomaton
Fri Mar 06, 2020 8:18 am
Forum: StereoPi hardware
Topic: Left and Right Cameras Reversed
Replies: 9
Views: 1327

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.