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Bilinear interpolation in TMS320C6678.

Mohamed Sohal
Expert 1170 points
Other Parts Discussed in Thread: TMS320C6678, MATHLIB, S2MEDDUS

Hi all,
Is there a Hardware support available for BILINEAR INTERPOLATION in TMS320C6678? Or should we do the entire coding?

 

 

 

Regards,
Sohal 

  • 0
    Genius 3770 points

    Hi Sohal,

    As I know, there is no HW support for bilinear interpolation in C6678.

    Even the imglib/dsplib/mathlib don't offer the direct support. You should write the assembly code by yourself.

    Allen

  • 0 in reply to Allen Lee
    Expert 1170 points

    Dear Allen,
    Thanks for the information. Is an optimised code for the same available to be shared?? 

     

     

     

    Regards,

    Sohal

  • 0 in reply to Mohamed Sohal
    Genius 3770 points

    Hi Sohal,

    Because we have changed the original code according to our application, so it doesn't mean a lot for you to reference. Sorry.

    Allen

  • 0 in reply to Allen Lee
    TI__Genius 17676 points

    Hi Sohal,

    this report might be interesting for you:

    http://www.ult.rsmjournals.com/content/19/3/140.full.pdf+html

    It talks about an ultra-sound system using the previous generation of C6000 DSP (c64x+), which didn't have the floating point capabilities. In the report the explain algrithm and how to map it onto the DSP instruction set using intrinsics ...

    I believe you can do further optimization using the floating point instructions that are now available on the c66x architecture ...

     

    Kind regards,

    one and zero

     

  • 0 in reply to one and zero
    Expert 1170 points

    Hi one and zero,
    Thanks for the reply but I dont have the signon for the site that you provided.

     

     

    Regards,

    Sohal 

  • 0 in reply to Mohamed Sohal
    TI__Expert 4920 points

    Hi Sohal

    You might find STK-MED 3.0 (software toolkit for medical imaging) for C66x useful as a reference here. There are 2 specific modules that might be of interest to you. One, is the scan conversion algorithm module (scu_ires) that "precomputes addresses of 4 input samples and corresponding interpolation coefficients for all scan conversion outputs. During run-time computation, the scan conversion simply computes the output samples based on bilinear interpolation using pre-computed addresses and interpolation coefficients." Here's an app note that was done on the SCU implementation http://www.ti.com/lit/an/sprab32/sprab32.pdf The second module that you might find useful from STK-MED is the cubic spline interpolation module (interp).

    You can download STK-MED from http://www.ti.com/tool/s2meddus and look at the source code (library and unit-test included) and documentation to see if it's useful for your use-case. It's free and licensed under BSD. 

    Regards,
    Uday