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Problems with DM6435 digital video (VPFE)

R&D10371
Intellectual 730 points

Hello!

I'm working with DM6435 to capture digital video. I had all the registers (CCDC, VPFE and RESIZER) configured properly and it worked perfectly: captured digital video was ok. But then I had to change the size of the video at the entrance of the resizer. So I changed the corresponding registers (CCDC, VPFE and RESIZER) but now the video is stripped, as shown in the image:

Does anyone have an idea of what might be wrong? I'm studying the registers but I still cannot find it.

Thanks in advance!

  • 0
    Intellectual 730 points

    I found some information about the resizer filter coefficients. Could the stripes be related to that? Do these coefficients depend on the size of the resizer incoming frame? I don't think so as far as I'm concerned but, could anyone please assure it? I mean, in both cases (at the beginning when it worked properly and now that it doesn´t) I'm down-sampling the image in the resizer, so I guess the coeficients should be the same. Is it correct?

  • 0 in reply to R&D10371
    Intellectual 730 points

    Ok, I think I got it. It seems to be related to the resizer's filter coefficients because the stripes switch to horizontal when I interchange the horizontal and vertical filters. I've found this link:

    http://focus.ti.com/general/docs/litabsmultiplefilelist.tsp?literatureNumber=spraai7b

    There are a couple of links on it that are supposed to download a kind of "Coefficient calculator" or something like that. Anyway I've tried uncompressing them in Linux and the files don't seem to be neither editable nor executable. Does anyone know what could I do or where to get these files (to calculate the coefficients) from another place?

    Thanks in advance!

  • 0 in reply to R&D10371
    Intellectual 730 points

    Please, I still need help!

  • 0 in reply to R&D10371
    Intellectual 730 points

    Ok, I found it! We were having problems with the calccoef application in our computers but we finally managed to do it on another computer. So it's working now.

    Anyway, right now the incoming video is 720x480 at the entrance of the VPFE and 640x480 at the entrance of the resizer. And it works properly. But I need to have a smaller part of the image at the entrance of the resizer (about 630x470). What would be the easiest way to crop it? I tried changing the resizer configuration (input height, width and pitch) but it's not working. It worked when I changed it from 720x480 to 640x480, but it's not working now. What could it be due to?

    Thanks in advance!