V4L2 Video Capture from Simulink Support Package for Raspberry Pi Hardware is not working, getting error image

Hello everybody,

I've got the following hardware setup: Raspberry Pi 2 Model B with Raspbian GNU/Linux 7 (wheezy) is connected via ethernet cable to a laptop running Matlab R2015b. IP config is static. On my laptop running the command

mypi=raspi
mypi

is giving me the properties of my raspberry pi, that's why I guess the connection setup should be correct. However when I want to use V4L2 Video Capture from Simulink Support Package for Raspberry Pi to display a v4l2 device that is running on my raspberry I get the following image:

Here you can see the simulink model:

Furthermore I can successfully play the v4l2 device with VLC Player on my raspberry using the command

 cvlc v4l2:///dev/video0

That's why I think the video stream cannot be corrupt.

Am I getting the error image in Matlab because there's something wrong with the colorspace or with the timing? I tried different sample times (1/30) with respect to the information when I'm running the command

v4l2-ctl d /dev/video0 --all

which is showing:

Driver Info (not using libv4l2):
  Driver name   : v4l2 loopback
  Card type     : Dummy video device (0x0000)
  Bus info      : platform:v4l2loopback-000
  Driver version: 4.1.13
  Capabilities  : 0x85208003
    Video Capture
    Video Output
    Video Memory-to-Memory
    Read/Write
    Streaming
    Device Capabilities
  Device Caps   : 0x85208003
    Video Capture
    Video Output
    Video Memory-to-Memory
    Read/Write
    Streaming
    Device Capabilities
Priority: 0
Video input : 0 (loopback: ok)
Video output: 0 (loopback in)
Format Video Capture:
  Width/Height  : 80/60
  Pixel Format  : 'RGB3'
  Field         : None
  Bytes per Line: 240
  Size Image    : 14400
  Colorspace    : SRGB
  Custom Info   : feedcafe
Format Video Output:
  Width/Height  : 80/60
  Pixel Format  : 'RGB3'
  Field         : None
  Bytes per Line: 240
  Size Image    : 14400
  Colorspace    : SRGB
  Custom Info   : feedcafe
Streaming Parameters Video Capture:
  Frames per second: 30.000 (30/1)
  Read buffers     : 8
Streaming Parameters Video Output:
  Frames per second: 30.000 (30/1)
  Write buffers    : 8

 User Controls

                    keep_format (bool)   : default=0 value=0
              sustain_framerate (bool)   : default=0 value=0
                        timeout (int)    : min=0 max=100000 step=1 default=0 value=0
               timeout_image_io (bool)   : default=0 value=0

Thank you very much in advance!

Best regards,

Ron

Answer 1

[supakit kriangkajorn]

1. please check you change the Simulation mode on the toolbar to External.
2. setting the Model configuration parameters (ctrl+e)

   select hardware implementation and change hardware board to pi

ref : Image Inversion

Answer 2

[Walter Roberson]

What error message?

The color bars are exactly what the block description says you will get during simulation. The block becomes meaningful when you deploy to hardware.