Walsh Hadamard Transform

[Moncef21]

Hello everybody! I am really new in this forum
My question is: What is the role of a Walsh Hadamard Transform in the step of Transformation in an H264 AVC encoder? It comes directly after applying a discrete cosine transform.
Thanks in advance

 

[EDACoA]

I also want to know

 

[nalino]

This is basically an encoder which maps n-bits of symbol to a N=2^n length of Walsh Hadamard sequence. Since Walsh sequences are orthogonal, they can be recovered by taking correlation with the particular Walsh sequene.

Walsh-Hadamard sequence generation:

| H_n -H_n |
H_2n = | |
| H_n H_n |

where H_n can be, for an example 1.