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image quality

bollgo
Intellectual 390 points


hi,all, My env: dm8168 and dvr rdk 4.0

My chains: vcap->vdis.

    when i cap the computer’s  desk signal to dis,i found that the character(for example the name of the desk image ) is not clear .for example, when I open a document(excel) , (1) The image (computer's desk signsl):

(2) the image (by dm8168)：

campare to (1) , you can see no grid in excel--(2)the image(by dm8168). so, how can i fix that problem? thanks.

  • 0
    TI__Guru 59700 points

    Create a data flow like

    Capture ->  ipcFramesOut (M3VPSS) ->  ipcFramesInHost (A8)

    and save the captured image and check if the grid is not seen in the captured image itself.

    This will help determine if issue is on the display or on the capture side

  • 0 in reply to Badri Narayanan
    Intellectual 390 points

    Badri,　thanks.

        I modify the code to test.

    Create a usecase with following links:

         Capture ->  ipcFramesOut (M3VPSS) ->  ipcFramesInHost (A8)

    and save the YUV frames .

    open the document ,the grid is not seen .( The above mentioned problems still exist )

    　(1)   my capture link param .

    pCaptureInstPrm->inDataFormat            = SYSTEM_DF_YUV422P;

    pCaptureOutPrm->dataFormat              = SYSTEM_DF_YUV422I_YUYV;

    We can see, the format is not the same, whether it will affect? 

       （2） Capture LINK- this factor ,whether it will affect the image quality? so ,I want to get the frame before capture link (not use capture link). How should I do? 

         Thanks.

  • 0 in reply to bollgo
    TI__Guru 59700 points

    Capture in YUV422I format will save the pixels received via Video Input Port to memory without any processing. If you see the issue at capture then the loss of quality is not due to  816x but due to external source. CHeck your external video decoder configuration.

    It is not possible to get frame before capture link.

  • 0 in reply to Badri Narayanan
    Intellectual 390 points

    Badri ,

          Following your suggestion, To check my external video decoder configuration.I have resolved this issue.

    thanks.

  • 0 in reply to bollgo
    Intellectual 445 points

    Hello

    I have meet the same problem. The image quality is not well, how to modify the external video decoder configuration?

    Thanks

    zhong

  • 0 in reply to zhong liu1
    TI__Guru**** 484485 points

    Check you external decoder specs.