Search found 189 matches

by stereomaton
Wed May 20, 2020 5:06 pm
Forum: The art of stereoscopic photo
Topic: Low Profile (staggered) Stereovision?
Replies: 10
Views: 3840

Re: Low Profile (staggered) Stereovision?

I thought of this geometric problem again, and I came to something that I knew but missed in my previous answers. Actually, you can totally align the images produced by the "staggered disposition", but the result will probably not be what you want. After alignment, the disparity will denote depth in...
by stereomaton
Wed May 20, 2020 2:12 pm
Forum: Other topics
Topic: New article published
Replies: 6
Views: 19018

Re: New article published

I just tested on good mobile connection (30Mbps) and it took 55s today. There must be something in the script of the blog. The problem is that partial content is not displayed so that we cannot start reading before the end of load.

Anyway, I already read it now. :-)
by stereomaton
Tue Apr 28, 2020 12:24 pm
Forum: Your Project
Topic: is there a way to connect 4 cameras?
Replies: 1
Views: 1463

Re: is there a way to connect 4 cameras?

The StereoPi itself has two dedicated camera ports, and you can connect only one camera per port. One solution for your Nimslo-like shot would be to use two StereoPi boards working together. A simple and dirty way would be to use an external button as described in this thread and connect the button ...
by stereomaton
Mon Apr 27, 2020 4:19 pm
Forum: OpenCV, Python and other image processing
Topic: Trouble with stereoPi calibration
Replies: 2
Views: 1845

Re: Trouble with stereoPi calibration

[Suggestions for realizator] In the linked function, the vector ekk looks like a vector of the absolute projection errors (I do not remember which projections are supposed to be done, I suppose one is left points on right image given the current parameters relating the two cameras, but for sure ekk ...
by stereomaton
Mon Apr 27, 2020 2:40 pm
Forum: StereoPi hardware
Topic: New guide: StereoPi used as USB device
Replies: 13
Views: 3957

Re: New guide: StereoPi used as USB device

I come back to the forum after you had a long discussion. I did not understand well how was the setup and I have the feeling that there was a confusion in the addresses to ping, but fortunately the problem is solved. When I tested it, I changed this file from an already existing one I had on my setu...
by stereomaton
Fri Apr 24, 2020 7:23 pm
Forum: StereoPi hardware
Topic: New guide: StereoPi used as USB device
Replies: 13
Views: 3957

Re: New guide: StereoPi used as USB device

These addresses are the APIPA range, which denotes that the PC cannot communicate with the DHCP server. If I understand well, you used the StereoPi as device in both cases, and a Windows PC as host, and then a RPi4 as host because the first case did not work. In both cases, you got APIPA address on ...
by stereomaton
Wed Apr 22, 2020 8:31 am
Forum: StereoPi hardware
Topic: WiFi dongle not connecting to Windows mobile hotspot
Replies: 2
Views: 1399

Re: WiFi dongle not connecting to Windows mobile hotspot

WiFi issues are always hard to debug. Since your setup works with other beacons, I would first check the channels: depending in the regions, different channels are allowed and your phone might emit in a channel that your dongle do not scan. For the troll, Windows is known to be insecure by default a...
by stereomaton
Wed Apr 15, 2020 8:11 am
Forum: Your Project
Topic: DIY VR headset for the StereoPi. 10 ms latency for just $135
Replies: 4
Views: 2747

Re: DIY VR headset for the StereoPi. 10 ms latency for just $135

The H264 encoder is limited in definition (I found about 2048×1350) and you exceed it with your configuration. Since you do not save the file, you can try to use the mjpeg encoder (-cd mjpg). Also check the camera modes, because you may have a trade off to do between fps and definition. Note: this p...
by stereomaton
Sat Apr 11, 2020 8:22 pm
Forum: Other software
Topic: Manual wifi configuration with buster
Replies: 0
Views: 2267

Manual wifi configuration with buster

I had problems to connect with my WiFi dongle with the buster image. It looks like the wlan0 interface is created by the system, but there is a problem with the GUI and more probably with the wpa/dbus gateway. I suspect that it is linked with the fact that this dongle uses a "wext" driver not handle...
by stereomaton
Fri Apr 10, 2020 5:25 pm
Forum: OpenCV, Python and other image processing
Topic: [solved] can't boot with non-slp c++ python open-cv image
Replies: 8
Views: 2244

Re: [solved] can't boot with non-slp c++ python open-cv image

This link looks good, and the stereopi starts.

It is quite surprising that there are some incompatibilities like that in such old format. It really looked like a transfer error to me, that's why I asked for the checksum of the archive (.zip file). Too late, I did not kept the file anyway.
by stereomaton
Thu Apr 09, 2020 4:13 pm
Forum: OpenCV, Python and other image processing
Topic: [solved] can't boot with non-slp c++ python open-cv image
Replies: 8
Views: 2244

Re: [solved] can't boot with non-slp c++ python open-cv image

Using the previous image "Raspbian Buster OpenCV Image (Python code)" (stereopi-opencv-20190912.zip), even originating from Google Drive as the other image, seems to work well both with unzip and 7z (same checksum).
It boots [but I forgot that I needed a mouse to start with it :-)]
by stereomaton
Thu Apr 09, 2020 3:20 pm
Forum: OpenCV, Python and other image processing
Topic: [solved] can't boot with non-slp c++ python open-cv image
Replies: 8
Views: 2244

Re: [solved] can't boot with non-slp c++ python open-cv image

It does not work better. $ 7z e cpp-python-2020-02-05.zip 7-Zip [64] 16.02 : Copyright (c) 1999-2016 Igor Pavlov : 2016-05-21 p7zip Version 16.02 (locale=fr_FR.UTF-8,Utf16=on,HugeFiles=on,64 bits,8 CPUs Intel(R) Core(TM) i7-8550U CPU @ 1.80GHz (806EA),ASM,AES-NI) Scanning the drive for archives: 1 f...
by stereomaton
Thu Apr 09, 2020 12:38 pm
Forum: OpenCV, Python and other image processing
Topic: [solved] can't boot with non-slp c++ python open-cv image
Replies: 8
Views: 2244

can't boot with non-slp c++ python open-cv image

Hum. I have a problem with this image too, but it is a different one. I downloaded it two times, and each time it seems that the zip file is currupted. $ unzip -t cpp-python-2020-02-05.zip Archive: cpp-python-2020-02-05.zip warning [cpp-python-2020-02-05.zip]: 982393912 extra bytes at beginning or w...
by stereomaton
Tue Apr 07, 2020 10:41 am
Forum: OpenCV, Python and other image processing
Topic: Faster framerate
Replies: 9
Views: 3345

Re: Faster framerate

I am aware that it is inefficient to turn all 5 IO on for the LEDs, I am working on a second version of the LED board in which all LEDs will be toggled on with a single GPIO. Oops, I remembered only of the first part of this sentence and sketched a schematic. Since I drew it, I will share it noneth...
by stereomaton
Sun Apr 05, 2020 12:32 pm
Forum: The art of stereoscopic photo
Topic: Low Profile (staggered) Stereovision?
Replies: 10
Views: 3840

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: 9
Views: 3345

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: 35
Views: 10846

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: 10
Views: 2573

Re: SLP update discussion

You already have the possibility to set [email protected] 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: 3123

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: 10
Views: 3840

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...