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slightech / MYNT-EYE-SDK

MYNT EYE SDK
http://www.myntai.com/camera
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Sample doesn't work #2

Closed jinchenglee closed 6 years ago

jinchenglee commented 6 years ago

![Uploading mynteye_experiment.png…]()

Ubuntu 16.04 LTS, gcc 4.9.3, 64bit machine, OpenCV3.2.0 + CUDA8.0 successfully built/installed.

Running sample in mynteye-1.5-linux-x64-gcc4-opencv-3.2.0/samples/bin/camera* will show some wired image seems not synchroized well, as attached image shows.

jinchenglee commented 6 years ago

OK, found the reason. It was not connected to the USB3.0 port. When I connect it to usb3.0 port, all sample applications can work.

But, the ./app/Preview still cannot detect the device, although it is connected to usb3.0 host (xhci): $ lsusb -t /: Bus 04.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 5000M | Port 4: Dev 2, If 0, Class=Video, Driver=uvcvideo, 5000M | Port 4: Dev 2, If 1, Class=Video, Driver=uvcvideo, 5000M ...

joinAero commented 6 years ago

Ensure sudo apt-get install libv4l-dev v4l-utils, then run v4l2-ctl --list-devices. Could you see the device?

<sdk>/apps/Previewer depends on v4l-utils to list the device. Select Device > Reload to refresh the device list.

Besides, check the environment variables after installation:

$ echo $MYNTEYE_SDK_ROOT
<Should be the sdk path>
jinchenglee commented 6 years ago

Thanks, after doing all these, the Preview app works. But it doesn't install anything though.

Anyways, I'll close this ticket.

$ sudo apt-get install libv4l-dev v4l-utils [sudo] password for xxx: Reading package lists... Done Building dependency tree
Reading state information... Done libv4l-dev is already the newest version (1.10.0-1). v4l-utils is already the newest version (1.10.0-1). 0 upgraded, 0 newly installed, 0 to remove and 60 not upgraded. $ v4l2-ctl --list-devices MYNTEYE (usb-0000:00:14.0-4): /dev/video0

$ echo $MYNTEYE_SDK_ROOT /blahblah/mynteye-1.5-linux-x64-gcc4-opencv-3.2.0

jinchenglee commented 6 years ago

BTW, may I know what camera sensor does MYNT EYE uses? Any details on what level of synchronization error is I can trust between camera and IMU? Thanks.

joinAero commented 6 years ago

Camera sensor: MT9V024

Synchronization error between camera and IMU (latest firmware): <1ms

jinchenglee commented 6 years ago

Is it possible to make it work with usb 2.0 at a lower frame rate? Although usb 3.0 is becoming popular, a lot of existing boards only have usb 2.0, say Raspberry Pi 3.

Running at a lower fps is definitely acceptable comparing to no support at all.

joinAero commented 6 years ago

It is not possible now. However, our embedded software engineers will research it and reply here when there is a result.