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RTOS/TDA2P-ABZ: black horizontal flickering waves in the background in camera streaming

deepikateriar
Genius 5870 points

Part Number: TDA2P-ABZ

Tool/software: TI-RTOS

Hi All,

I am using a TDA2P custom board with 954+953+AR0220 sensor. I am using VSDK 3.03.

The camera stream with SERDES is working fine,but I can see some horizontal waves in the background of the HDMI.

Not sure what can cause this.It is independant of light.

Although without SERDES (connecting the camera alone) there are not horizontal waves.

Can anyone highlight the issue.

Regards,

Deepika

  • 0
    TI__Guru**** 493865 points

    Hi Deepika,

    You need to go step by step and identify the module, which introducing these artifacts. Otherwise it is very difficult to tell where is the problem. 

    You could start with the capture, dump the captured frame and check it offline if this has artifacts. If it does not, go the next module in pipeline and so on.

    Rgds,

    Brijesh

  • 0 in reply to Brijesh Jadav
    Genius 5870 points
    Hi Brijesh,

    I am using iss_capture_isp_simcop_display to display the data.If I capture the frame,it does not show any artifacts.

    Regards,
    Deepika
  • 0 in reply to deepikateriar
    TI__Guru**** 493865 points
    Hi Deepika,

    If you dont see artifacts in the captured frame, then the rest of the data flow is same for both SERDES based and camera and direct camera, isn't it? There should not be artifacts here also.
    Are you seeing flickering artifacts around edges or horizontal waves?? Can you share the snapshot of the artifacts?

    Rgds,
    Brijesh
  • 0 in reply to Brijesh Jadav
    Genius 5870 points

    Hi Brijesh,

    Attaching the snapshot for the same.It is horizontal waves are  not flickering as such.Though not very prominent but it is still noticeable.

    I am not able to attach a YUV file here so sending you the screenshot.

    I am attaching a video too. It has some audio data as I did record from my mobile.

    Regards,

    Deepika

  • 0 in reply to deepikateriar
    TI__Guru**** 493865 points
    Deepika,

    You have fisheye lens connected to the camera. Just change the lens from the direct camera to this SERDES camera, this effect will go away.

    Rgds,
    Brijesh
  • 0 in reply to Brijesh Jadav
    Genius 5870 points
    Hi Brijesh,

    The camera is same in both the cases. Just in one case SERDES board is connected in between. I have attached a video file in the previous post.

    Regards,
    Deepika
  • 0 in reply to deepikateriar
    TI__Guru**** 493865 points
    Deepika,

    You mean that black waving artifacts?
    This might be because of the frequency difference between the light source and camera...
    But this should come in both the cases.

    Regards,
    Brijesh
  • 0 in reply to Brijesh Jadav
    TI__Mastermind 24525 points
    This is 50Hz flicker. You may solve it by forcing sensor integration time to be a multiple of 10ms. This will work in India and other countries where electrical frequency is 50Hz. For countries with 60Hz power supply (US etc) you will need to make it a multiple of 8.3 ms.
  • 0 in reply to Mayank Mangla
    Genius 5870 points

    Thanks a lot Brijesh,

    I will confirm with my customer,as this was reported as an issue by them. This flickering is seen more in the video than actual scenario.

    Regards,
    Deepika