How to get VGA camera(optical flow) Image?

ykim43 · ‎07-18-2017

I'm using intel aero RTF. Firmware is 1.4.0.

I want to show VGA camera(optical flow) image.

I find the 2way,

First, aero wiki document. https://github.com/intel-aero/meta-intel-aero/wiki/06-Computer-Vision-3D-AI 06 Computer Vision 3D AI · intel-aero/meta-intel-aero Wiki · GitHub

It show example code for record real sense camera. So I modify /dev/video13 -> /dev/video0

gst-launch-1.0 v4l2src device=/dev/video13 do-timestamp=true ! video/x-raw, format=YUY2, width=640, height=480, framerate=30/1 ! autovideoconvert ! vaapih264enc ! rtph264pay ! filesink location=video13.mp4

->

gst-launch-1.0 v4l2src device=/dev/video0 do-timestamp=true ! video/x-raw, format=YUY2, width=640, height=480, framerate=30/1 ! autovideoconvert ! vaapih264enc ! rtph264pay ! filesink location=video0.mp4

It occur error show :

ERROR: from element /GstPipeline:pipeline0/GstV4l2Src:v4l2src0: Device '/dev/video0' is not a capture device.

Additional debug info:

../../../gst-plugins-good-1.10.4/sys/v4l2/v4l2_calls.c(633): gst_v4l2_open (): /GstPipeline:pipeline0/GstV4l2Src:v4l2src0:

Capabilities: 0x4200002

Second, using this code : https://github.com/intel-aero/sample-apps GitHub - intel-aero/sample-apps: This repository will contain source code for sample applications

I run this command, C=20 INPUT=1 MODE=PREVIEW M_F=YUV420 /home/sample-apps/capturev4l2/capture_example --userp -d /dev/video0

C=20 INPUT=1 MODE=PREVIEW M_F=RGB32 /home/sample-apps/capturev4l2/capture_example --userp -d /dev/video0

It seems like work, But result is fail. (result attach file)

I show this image using this homepage http://rawpixels.net/ RAW Pixels

Image look several line.

How do I get VGA camera image?

idata · ‎07-18-2017

Hello adazio,

Thank you for your interest in the Intel® Aero Ready to Fly Drone.

I got VGA preview using the command presented in https://github.com/intel-aero/meta-intel-aero/wiki/06-Computer-Vision-3D-AI:

gst-launch-1.0 v4l2src device=/dev/video13 ! video/x-raw,width=640,height=480,framerate=30/1 ! xvimagesink

Changing "video13" for "video0" produces an expected error message since it is not associated with any capturing device. Could you please further explain why you make this modification?

I'll be waiting for your response.

Have a nice day.

Regards,

Andres V.

ykim43 · ‎07-18-2017

I need down- facing VGA Camera(OV7251) image.

As far as I know VGA Camera(OV7251) is assigned to /dev /video0, So I exchange /dev/video13 -> /dev/video0

RKura · ‎07-19-2017

I believe the VGA camera (down facing) is video2. Can you try that and let me know if it works for you ?

idata · ‎07-19-2017

Hello adazio,

Thank you for further explaining your inquiry. I'll suggest you to check this couple of threads:

How to use 8 MP RGB & VGA Camera

https://communities.intel.com/message/459500# 459500 https://communities.intel.com/message/459500# 459500

when using ov8858 ov7251 cameras

https://communities.intel.com/message/483906# 483906 https://communities.intel.com/message/483906

There you will find information that may help you accomplish what you are trying to do.

If you have any update or question, don't hesitate to contact us.

Have a nice day.

Regards,

Andres V.

idata · ‎07-24-2017

Hello adazio,

I was wondering if you could check the last suggestion provided.

If you have any update or question, don't hesitate to contact us.

Regards,

Andres V.

wliu28 · ‎11-10-2017

Hello adazio,

Have you known how to use optical-flow in Aero RTF? In fact, I can not get VGA camera image using way 1.

Would you mind sharing your experience about what should I do to enjoy optical flow? I try to test referring this link:https://github.com/intel-aero/aero-optical-flow GitHub - intel-aero/aero-optical-flow ,but failed all the time.

idata · ‎11-13-2017

Hi weiqi_liu,

In the latest release, we have the bottom facing camera stream on by default. You can open the RTSP streams as shown in this guide: https://github.com/intel-aero/meta-intel-aero/wiki/06-Cameras-and-Video

Regarding the optical flow github you linked, what error messages are you getting? Did you try to build from source or running from v1.6.0? Do you also have the lidar installed?

Regards,

Jesus