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DM355 IPIPE Edge enhancer & Chroma suppression

Leon Yin
Intellectual 255 points

Greetings:

      I met some problem about edge enhancer & chroma suppression registers configue. There are programmable edge enhance tables as the manual noticed, but nothing about how to configure them.  any advice or hint about it?

     In chroma suppression part , the register FCS_SHF_Y which means the down shift size of the HPF,etc. What does the ' down shift size ' or 'down shift length '  mean actually?

Best regards~

Leon Yin

  • 0
    Prodigy 115 points

    Hi Leon,

    Were you able to make some progress with the edge-enhancement module? I have put a post on:

    http://e2e.ti.com/forums/t/9394.aspx

    So we are both seeking some ideas on configuring the IPIPE edge-enhancer. I have tried several things and have got some help from the following website:

    http://www.imagemet.com/WebHelp/spip.htm#hid_filters_edge_enhancement.htm

    Some good things I have found from there are:

    1. All the convolution kernels are 3x3, which is what the configuration in the IPIPE requires. An important point to mention here, the 3x3 matrix is called as a "5x5 order" filter. That is the terminology from signal processing: a 1-D filter with 3 coefficients is said to be of order 4; a 2-D with 9 coefficients (3x3) is said to be of order 5x5.
    2. Secondly, this website speaks a bit about edge-intensities, which can be both negative and positive. A transition from a bright region to darker, and vice-versa, is the reason behind a signed-output from an edge-detection filter. IPIPE requires a table to map the edge-intensities to additive components, which on addition to the original image would give enhancement.

    Let me know if this information helps. We can talk more about aligning our tables right (in terms of indexing), as I am still not very sure on that end.

     

    Thanks,

    Karan

     

  • 0 in reply to Karan Batra
    Prodigy 20 points

    Hi Karan

    I am a new bee to DM355 trying to figure out how to configure the edge enhancer in the IPIPE.

    Can you give me any information you have on the non-linear table.

    Can you also give me an example of the convolution kernel and non-linear table so that it will be more clear to me.

     

    Thanks,

    Ravi

  • 0 in reply to Raviteja
    Prodigy 115 points

    Hi Ravi,

    As I mentioned in my previous reply to Leon, I found the following website helpful for the various convolution-kernel-examples that they provide.

    http://www.imagemet.com/WebHelp/spip.htm#hid_filters_edge_enhancement.htm

    As far as the non-linear table is concerned, I would first recommend a document that you should get hold of from your local sales representative from TI. Its known as Video Processing Front End (VPFE) guide. You would need to sign a Non Disclosure Agreement to get that.

    Once you have that, you would be better able to understand this non-linear table.

    Let me know if this helps.

    Regards,

    Karan

  • 0 in reply to Karan Batra
    Prodigy 20 points

    Hi Karan

    Thanks for the reply