non-square pixel mode

ranchu

Guru 20755 points

Hello,

I would like to ask if Netra support non-square pixels mode. the HDVPSS talk about non linear scaling and refers to HDVPSS specifications. I would like to ask if such feature is available and can be used for any resolution.

Regards,

Ran

over 13 years ago

0 Brijesh Jadav over 12 years ago

TI__Guru**** 475385 points

Hi Ran,

Non-Linear scaling is mainly used for maintaining aspect ratrio of central portion of the image. in the scaling, it maintains aspect ratio for central portion of the image by doing linear scaling and does non-linear scaling for other portion, but this is not non-square pixel mode. What do you mean by non-square pixel mode?

Thx,

Brijesh

0 ranchu over 12 years ago in reply to Brijesh Jadav

Guru 20755 points

Hi Brijesh,

non-square pixel is PAR (pixel aspect ratio), but as I understand today, decode and encoder can use frames with different aspect ratio in the codec, i.e. The encoder/decoder process works on pixel, and does not mind what the pixel aspect ratio , right ?

If that is so, than there is no problem.

Thanks, Ran

0 Brijesh Jadav over 12 years ago in reply to ranchu

TI__Guru**** 475385 points

Hi Ran,

Encoder/Decoder works on Pixel Values, so it does not matter. As far as i know, typically, PAR is used in the display system for specifying shape of the pixel. correct?

Thx,

Brijesh Jadav

0 ranchu over 12 years ago in reply to Brijesh Jadav

Guru 20755 points

right, thanx

0 ranchu over 12 years ago in reply to Brijesh Jadav

Guru 20755 points

Hi Brijesh,

There is concept of aspect ratio in codec (H.264). see 4.2.2.19 in H.264 codec (aspectRatio parameter).

We thought that to support change of resolution and aspect ratio we need to do scaling, padding before the frame goes to encoder. But now the question arise if there is option to do all this scaling, padding in codec using its parameters ?

Best Regards,

Ran

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non-square pixel mode