Search found 210 matches

by stereomaton
Sun Apr 04, 2021 9:10 pm
Forum: Video, photo (livestream, recording, photo capturing)
Topic: Raspivid 3D Top-Bottom Bug
Replies: 11
Views: 1824

Re: Raspivid 3D Top-Bottom Bug

I talked about gpu_mem in config.txt of the BOOT partition. The GPU and OS share the same RAM, but cannot interact to manage the allocations, and thus we have to define where is the split, that is which amount will be let untouched by the OS so that the GPU can use it and the way around. Since the i...
by stereomaton
Sat Apr 03, 2021 5:24 am
Forum: Video, photo (livestream, recording, photo capturing)
Topic: Raspivid 3D Top-Bottom Bug
Replies: 11
Views: 1824

Re: Raspivid 3D Top-Bottom Bug

From what I understood, the video preview is directly managed by the gpu that bypasses the display manager, displaying the video on an overlay composited by the hardware. Thus the first thing I would try in your case is to increase the video memory split size. If it doesn't work, I would input the f...
by stereomaton
Sat Apr 03, 2021 5:10 am
Forum: Other topics
Topic: mouse and keyboard not working
Replies: 4
Views: 1796

Re: mouse and keyboard not working

"stereopi starter kit" sounds like the v1.
In v1, you "have to" power the stereopi with the white JST connector. If you power it with the micro USB, it enters in device mode and the USB-A connectors are then disabled.
Maybe it is what happens in your case.
by stereomaton
Wed Mar 31, 2021 8:13 am
Forum: StereoPi hardware
Topic: StereoPi v2 Camera Kit how to use only one oscillator for better sync
Replies: 3
Views: 1309

Re: StereoPi v2 Camera Kit how to use only one oscillator for better sync

Notice that in their case, they also removed what raspberry call the crypto chip, which is not needed for StereoPi (i.e. you can keep this chip) Also, I would encourage to twist the two wires together (the one that carries the oscillator signal and the one for the ground) to minimize interferences. ...
by stereomaton
Wed Mar 31, 2021 7:57 am
Forum: StereoPi mechanics
Topic: Are there cables available for wider basis?
Replies: 3
Views: 1537

Re: Are there cables available for wider basis?

These cables have some flexibility to elastically bend and twist in several directions, but if you need it, you can bend them hardly like in your photo, including at several places. The trick is that once bended hardly, you should not unbend to avoid to break the metallic tracks in it.
by stereomaton
Wed Mar 31, 2021 7:45 am
Forum: Video, photo (livestream, recording, photo capturing)
Topic: Livestreaming to a web
Replies: 9
Views: 1841

Re: Livestreaming to a web

I do not have special links in mind for gstreamer and have not played with it yet. It can be controlled via python with deep access, but it is not simple. Using the VideoWriter is simpler because you only have to write the downstream pipeline in the string form, but not easy for beginners. However, ...
by stereomaton
Wed Mar 31, 2021 7:20 am
Forum: StereoPi hardware
Topic: Some questions before pledging V2
Replies: 10
Views: 2107

Re: Some questions before pledging V2

The frame rate of the video is not relevant in the estimation of the sync. They are just a lot of photos and a delay can be present at each shot. With the fast moving subject, we see that this delay is by far smaller than the time between two frames. As I said, this small sync error might be small e...
by stereomaton
Wed Mar 31, 2021 6:27 am
Forum: Video, photo (livestream, recording, photo capturing)
Topic: Bad gateway and no browser stream incoming after upgrading
Replies: 14
Views: 2267

Re: Bad gateway and no browser stream incoming after upgrading

You can probably use the command chmod to override the rights, but it is probably better to understand how the rights are set in the first place. But again, the difference between 755 and 644 are execution rights, and then it is strange that you need them on a configuration (thus not executable) file.
by stereomaton
Wed Mar 31, 2021 6:14 am
Forum: StereoPi hardware
Topic: StereoPI V2 - how to trigger a flash light?
Replies: 2
Views: 995

Re: StereoPI V2 - how to trigger a flash light?

You probably want to add electronics between the GPIO and the flash. Depending on the schematics I found online, they add either optocoupler (that I would personally prefer as it isolates the two sides), transistor, thyristor or even sometimes triac. You might add an ne555 to add an adjustable delay...
by stereomaton
Sun Mar 21, 2021 6:22 pm
Forum: StereoPi hardware
Topic: Some questions before pledging V2
Replies: 10
Views: 2107

Re: Some questions before pledging V2

So the answers: [this time I copied the questions :-)] > The V2 kit comes with 2 x IMX219 160 FoV camera. Each is 8MP - right? IMX219 is a 8Mpx sensor, yes. > Can I shoot stereo still images at this high resolution - means I get images 2 x 8MP side by side (which will result in 16MP image)? The v1 w...
by stereomaton
Sun Mar 21, 2021 5:37 pm
Forum: StereoPi hardware
Topic: Some questions before pledging V2
Replies: 10
Views: 2107

Re: Some questions before pledging V2

I am a user of the v1 and did not looked at the v2 much, but I can answer some questions. By the way, it seems that you edited your post while I was writing an answer (with a pause of a few hours), because the numbers do not correspond anymore. I have to start again. The StereoPi is not a ready-to-u...
by stereomaton
Sun Mar 21, 2021 10:47 am
Forum: OpenCV, Python and other image processing
Topic: DISFlow for disparity map
Replies: 10
Views: 2128

Re: DISFlow for disparity map

I tested it in the past. Here (a new test) with a photo from Perseverance robot on Mars: https://i.ibb.co/CM0yR5x/mars-test.jpg DISFlow gives this: (on the right part, I fused the original image for reference, and added the color wheel which says in which direction is the estimated displacement) htt...
by stereomaton
Sun Mar 21, 2021 9:52 am
Forum: Video, photo (livestream, recording, photo capturing)
Topic: Bad gateway and no browser stream incoming after upgrading
Replies: 14
Views: 2267

Re: Bad gateway and no browser stream incoming after upgrading

You are working against the way SLP works (which is not a reproach, you do what you want with your board) so you have to find which mechanism you did not brake that is doing that. The mode is classically changed by a chmod or a copy, or sometimes if a file is removed and rewritten. I let you investi...
by stereomaton
Sun Mar 21, 2021 9:39 am
Forum: Video, photo (livestream, recording, photo capturing)
Topic: Livestreaming to a web
Replies: 9
Views: 1841

Re: Livestreaming to a web

If I understand your project well, you want to have: 1) a live stream 2) be able to send messages and report status to an autonomous application you design, via a web interface There are many ways to achieve this. I would say that the easiest would probably be to start with SLP to take advantage of ...
by stereomaton
Sun Mar 21, 2021 9:17 am
Forum: Other hardware
Topic: stereopi hats wtf ?
Replies: 4
Views: 1336

Re: stereopi hats wtf ?

If the GPIO connector was the way around, the pi-hat would cover the camera connectors.
Since the cameras are primary functions with this board, it is probably better this way.
by stereomaton
Mon Mar 01, 2021 2:40 pm
Forum: OpenCV, Python and other image processing
Topic: DISFlow for disparity map
Replies: 10
Views: 2128

Re: DISFlow for disparity map

Yes, my second question was for this case: the optical flow searches for changes in 2D, but sometimes it might find vertical component if the grayscale image had not enough information to decide (uniform zone, occlusion...). That's why I asked if we can constrain it.
by stereomaton
Sun Feb 28, 2021 11:51 pm
Forum: OpenCV, Python and other image processing
Topic: DISFlow for disparity map
Replies: 10
Views: 2128

Re: DISFlow for disparity map

Shouldn't it be flow[...,0] to get the U component of the optical flow?
Is there a way to say that we are sure that the image is well aligned and that the flow should be computed only in X and not Y, or at least bias the cost function to prefer horizontal flow when possible?
by stereomaton
Sun Feb 28, 2021 11:18 pm
Forum: Video, photo (livestream, recording, photo capturing)
Topic: New to Raspberry Pi
Replies: 8
Views: 1562

Re: New to Raspberry Pi

What do I need to do to the video recordings from stereopi to view a movie is stereo on the Oculus headset? I have no experience with it, but I heard of people looking at side-by-side videos/movies in their oculus headset. So there should be applications to load such videos. With a quick search, I ...
by stereomaton
Sun Feb 28, 2021 10:05 pm
Forum: Your Project
Topic: is there a way to connect 4 cameras?
Replies: 5
Views: 3405

Re: is there a way to connect 4 cameras?

The article has indeed an emphasis on fast synchronization with a lot of little tricks to achieve it. If your scene is stationary (or even has slow movements), using the button solution presented in the first answer will be enough and simpler. In the linked thread, the user MauriceCyril has answered...
by stereomaton
Sun Feb 28, 2021 9:41 pm
Forum: StereoPi hardware
Topic: StereoPi v2
Replies: 20
Views: 5127

Re: StereoPi v2

I would think I need the ability to change the angle of the cameras (rather than keep them parallel) for microscopy. Does this sound right to you? Just in case, I think of two possible consequences: 1) You will probably need to compensate for the keystone effect (perspective). When the two sensors ...