• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Subscribers 98 subscribers
  • Views 241 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Original question:

AM62A7-Q1: An error occurs when two pipelines run simultaneously on the platform.

TDA4VH-Q1: how to do [R, T] transformation in LDC?

Hua Jianxiong
Intellectual 410 points
Part Number: TDA4VH-Q1


Tool/software:

Hi, TI experts, 

In DCC LDC plugin, there is a 3x3 [R, T] matrix to do rotation and translation. However, in this matrix we can only do rotation along z-axis, and do translation in x-y plane.


My question is: how to do rotation along x or y axis in LDC ?

Thanks, 

Jianxiong Hua

  • 0
    TI__Guru 60290 points

    Hi Jianxiong,

    Hua Jianxiong said:
    My question is: how to do rotation along x or y axis in LDC ?

    That requires enabling perspective warp in LDC register and changing the values of G and H.

    Hua Jianxiong said:
    in this matrix we can only do rotation along z-axis, and do translation in x-y plane.

    In general, I don't recommend using the perspective because of H/W limitation (bit-depth and precision) if you cannot verify all possible G and H values together with the mesh LUT.

  • 0 in reply to Gang Hua
    Intellectual 410 points

    Hi Gang, 

    To do rotation along x, y, z axis, the matrix are belows:

    But in DCC, the [R T] matrix is: 

    I'm skeptical about using this matrix implementation of achiving perspective transformation. 

    In other words, is it possible to inclue both rotation and perspective transformation via a user defined mesh.txt？

    Jianxiong Hua

  • +1 in reply to Hua Jianxiong
    TI__Guru 60290 points
    Hua Jianxiong said:

    I'm skeptical about using this matrix implementation of achiving perspective transformation. 

    LDC matrix is common back mapping and nothing special except for the integer presession limitations.
    The math shall be the same although your equations are for forward mapping.

    Hua Jianxiong said:

    In other words, is it possible to inclue both rotation and perspective transformation via a user defined mesh.txt？

    That is what I normally recommend doing to avoid integer precision issue in LDC H/W.