How to Extract 24 bits per pixel image from YUV422 (CCIR565)?

[Oveis.Gharan]

Hi everybody
I want to grabb digital 24 bit per pixel video from PAL format analog video. I find the PAL video decoder TW9912 from Intersil that could decode analog PAL video to CCIR565 YUV422 digital video stream. How could i grab the 24 bit per pixel image from this digital video stream.

Thanks in advance.
Oveis

 

[Easyrider83]

I2c for configure and ITU-R 656 for video stream

 

[Oveis.Gharan]

I2c for configure and ITU-R 656 for video stream

Do you mean that Analog Video Decoders such TW9912 could be configured to be YUV420 instead of YUV422?!

 

[dick_freebird]

Have you looked at commercially available "frame grabbers"
purporting to handle at-speed video, to see

1) which ones produce 24-bit video capture at video rate
2) of those, what's the guts?

Probably a HD or better stream will be difficult to throw
across any distance without heavy compression (another
stage of processing). Where will you put the data, is a
point to ponder. But PAL (as my decades-stale understanding
lies) is low resolution and low frame rate). On the minus
side, PAL and NTSC are pretty poor Z resolution as well,
as they are analog fundamentally and so prone to SNR
degradation from many sources. That being the case, do
you expect true chroma channel ENOB=8?

 

[Oveis.Gharan]

Have you looked at commercially available "frame grabbers"
purporting to handle at-speed video, to see

1) which ones produce 24-bit video capture at video rate
2) of those, what's the guts?

Probably a HD or better stream will be difficult to throw
across any distance without heavy compression (another
stage of processing). Where will you put the data, is a
point to ponder. But PAL (as my decades-stale understanding
lies) is low resolution and low frame rate). On the minus
side, PAL and NTSC are pretty poor Z resolution as well,
as they are analog fundamentally and so prone to SNR
degradation from many sources. That being the case, do
you expect true chroma channel ENOB=8?

Do you mean that the PAL Video Decoding with 24 bits per pixel is not meaningful at all?

 

[dick_freebird]

No, I mean that expecting 8 bits of fidelity is probably
going to end in some disappointment (if you were to
measure; as video, you probably get out what you put
in and maybe that's enough).

But 24 bpp when the video quality only deserved 5+6+5
just makes all of your hardware chain that much more
challenging, for what upside?