Recording with the Camera

[tdlrali]

I know for a fact that one of the martian teams used the camera to record "video" (couple of pictures per second), and reviewed it after each match. As to whether the "video" was stored on the robot (and downloaded after the match), or recorded on a laptop during the match, I don't know.

[Russ Beavis]

Doesn't the default LabVIEW Dashboard (for the Driver Station "display") show real-time video (regardless of whether you're using LabVIEW or C on the cRIO)? You should be able to modify the LabVIEW Dashboard to store the images and somehow stitch them together later on.

[nathanww]

The simplest way to record camera video is to stream it to a computer and use a motion screen capture utility to grab it. At competitons, or situations where streaming video back to PC is impractical, you can also use the "image write" function to record each frame as a sperate image to the cRIO's flash, and then FTP into it and use a program to batch-convert the images into a video.

[ExarKun666]

Originally Posted by Russ Beavis

Doesn't the default LabVIEW Dashboard (for the Driver Station "display") show real-time video (regardless of whether you're using LabVIEW or C on the cRIO)? You should be able to modify the LabVIEW Dashboard to store the images and somehow stitch them together later on.

I am not sure about this, I have never tried using the Driver Station "display", but I have tried to use the LabVIEW Dashboard, while the robot had Wind River code on it, and the image would not appear on my laptop, not sure if this also means it would not work on the Driver Station.

NOTE: yes I then did try the Dashboard with the robot on LabVIEW code, and it would show on my laptop. However, our team would like to keep it in Wind River, so we can still have all the functions that the robot does, instead of re-imaging to LabVIEW, and only having the default operations.

Originally Posted by nathanww

The simplest way to record camera video is to stream it to a computer and use a motion screen capture utility to grab it. At competitons, or situations where streaming video back to PC is impractical, you can also use the "image write" function to record each frame as a sperate image to the cRIO's flash, and then FTP into it and use a program to batch-convert the images into a video.

What motion screen capture utility would you recommend? Is the "image write" function something you need to write code for, or how would you do this? What do you mean by FTP? [Sorry for my lack of knowledge in this area, but any details would be great ]

[Joe Ross]

Originally Posted by ExarKun666

I am not sure about this, I have never tried using the Driver Station "display", but I have tried to use the LabVIEW Dashboard, while the robot had Wind River code on it, and the image would not appear on my laptop, not sure if this also means it would not work on the Driver Station.

NOTE: yes I then did try the Dashboard with the robot on LabVIEW code, and it would show on my laptop. However, our team would like to keep it in Wind River, so we can still have all the functions that the robot does, instead of re-imaging to LabVIEW, and only having the default operations.

Did you use the PCVideoServer class? I think there's an example included with WindRiver.

[ExarKun666]

Originally Posted by Joe Ross

Did you use the PCVideoServer class? I think there's an example included with WindRiver.

No we didn't try the PCVideoServer class. But now you bring it up, do you use the PCVideoServer class to record or take images too?

[Greg McKaskle]

The PCVideoServer class sends images on a C++ cRIO back to the dashboard. The LV framework had the equivalent code in by default, but because of deadlines, it needed to be added to the C++ code.

Once the images are send to the dashboard, you can modify the LV dashboard code to take the jpgs and add them to an AVI using the vision VIs on the PC.

I'm not at a PC, but I suspect there is an AVI building example if you search for it.

Greg McKaskle

[ExarKun666]

Well thank you for all the input on the topic, unfortunately we can't test it tomorrow because we are in the midst of looking for our dongle, and we are using it this Thursday (that is the camera recording thing), so I have to program or do whatever to make it work all in my head for our presentation on that day, so I have no trial and error leeway (this is to get a team started in FLL).

[nathanww]

What motion screen capture utility would you recommend? Is the "image write" function something you need to write code for, or how would you do this? What do you mean by FTP? [Sorry for my lack of knowledge in this area, but any details would be great

I usually use Camstudio--it's free and gets a fairly good frame rate
"Image write" is one of the more obscure FRC vision functions that lets you store an Image object acquired from the camera to a file on flash(you can read more about it in the vision api docs)

FTP stands for File Transfer Protocol. which, as you might expect, is a system for transferring files between computers. the cRIO can act as an FTP server, meaning that it allows a remote computer to accsess it's internal flash memory. This means that if you use the image write function to record frames, you can use FTP to retrieve the images from the cRIO's memory and animate them.

[PaW]

1318 did some recording, but how/when/with what, you'll have to contact username darkmessenger88 directly (he's the programmer).

http://www.chiefdelphi.com/forums/showpost.php?p=853549

[ExarKun666]

BTW, I think I forgot to mention that we wanted to record while in teleop mode, I don't think it would make a difference, but can the recording only work in autonomous, or both autonomous and teleop??

[Greg McKaskle]

The mode has no effect.

Greg McKaskle