[Mp4-tech] Interlace problem on DM642 platform

[mayank agarwal]

Hi all,
i have scaled the CIF image to 4CIF size but when i am
catching the video through camera and displaying it in
real time video i am getting lines around the finger
(interlace problem).I am using MPEG-4 simple profile
as video algorithm on DM642 platform.
     Video capture and display is made possible on
DM642 platform is made possible by using generic part
(saa7115 decoder for capture and saa7105 encoder for
display)and the board specific part (vport library and
the edma which is used to transfer data to and from
video ports).I have the following doubts:
1.Is it possible to deinterlace the video before
capture by making changes in video capture and video
display parameters file(One parameter is to capture
and display video by frame/field1/field2/progressive
mode) and another parameter is whether to keep the
fields separate or merged.I could not understand the
meaning of these parameters(no reasonable explanation
in SPRU629E).If we can solve the interlace problem by
changing these parameters or we have to make changes
elsewhere.
2.If at all there is no solution given by TI to solve
above problemby making changes in video capture and
display parameters file then if we have to modify
the vport library which ontrols the saa7115 capture.
     Any hints /suggestions are welcome.
                 Many thanks for cooperation.
                                  Regards,
                                  Mayank
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