HVX200 CCD Specs and DSP info now released

[Graeme Nattress]

Very interesting. Only issue I have is the only papers I’ve read on pixelshift give a root 2 (1.414) theoretical max resolution improvement for 1 shift, and the BBC paper I read gave a practical 1.3 figure, not the 1.5 quoted by Panasonic.

Graeme

– http://www.nattress.com – Film Effects and Standards Conversion for FCP

[Jan Crittenden livingston]

HI Graeme,

I had the same argument with the engineers in Japan, and were absolutely insistant on this number. I think it was due to the H & V nature of the Offset. But they would not let me publish this without using the 1.5.

Best,

Jan

Jan Crittenden Livingston
Product Manager, DVCPRO, DVCPRO50, AG-DVX100
Panasonic Broadcast & TV Systems

[Graeme Nattress]

Understood! Hope you’re feeling a lot better Jan.

Graeme

– http://www.nattress.com – Film Effects and Standards Conversion for FCP

[Lawrence Marshall]

Interested in follow-up from Panasonic regarding these comments from a poster at dvxuser.com:

–540 vertical pixels also means there are only 540 vertical chroma pixels on a 1080p format. That means color is practically 4:2:0 and not 4:2:2. 4:2:2 was supposed to be an advantage over the competition and it’s not there. The HVX has exactly the vertical chroma a 1080 HDV camera has. And lower recorded horizontal chroma in NTSC HVX. 640 compared to 720.–

Also:

–540 vertical chroma pixels in 1080p format is 4:2:0 color by definition. There is no higher color resolution. The camera is recording 1080 chroma but the sensor only has 540 pixels.–

And:

–Pixelshifting is only reading extra luma by using the sensor offsets. Chroma stays the same. Since we know the native resolution of the sensor now, any output will be limited to 960×540 color.–

I purchased and just received my HVX-200, and wonder what the above translates into “real world” when I go to shoot green screens…

Thanks, Larry Marshall

p.s. – I apologize if cross-posting is not permitted at the Cow from other forums… what are the rules on this?

[Jan Crittenden livingston]

:Lawrence Marshall–540 vertical pixels also means there are only 540 vertical chroma pixels on a 1080p format.

No Lawrence that is not what that means. Please go back and reread the article. Look at where it talks about pixel shift and how that ups the ante.

>That means color is practically 4:2:0 and not 4:2:2. 4:2:2 was supposed to be an advantage over the competition and it’s not there. The HVX has exactly the vertical chroma a 1080 HDV camera has. And lower recorded horizontal chroma in NTSC HVX. 640 compared to 720.–

You need to look at the part that says that the output of the chip set, which BTW is an analog signal, and pay attention to the part that says it outputs a 60P signal and in a 14Bit A/D converstion to a 19 Bit DSP it is transformed into the digital domain. From there it is recorded in the DVCPRO HD format which indeed is 4:2:2.

>–540 vertical chroma pixels in 1080p format is 4:2:0 color by definition. There is no higher color resolution. The camera is recording 1080 chroma but the sensor only has 540 pixels.–

Again, go back ad read what the article says about the equivalent pixel count after pixel shift.
And:

>–Pixelshifting is only reading extra luma by using the sensor offsets. Chroma stays the same. Since we know the native resolution of the sensor now, any output will be limited to 960×540 color.–

Again the signal coming off of the chip is first an analog signal, and then is transfromed into a 1080P/60 signal and from there all other formats are formed.

>I purchased and just received my HVX-200, and wonder what the above translates into “real world” when I go to shoot green screens…

I think you like others that have tried it will be very please at the results. There are numerous examples of this on the dvxuser site and the DVinfo community site as well.

Best,

jan

Jan Crittenden Livingston
Product Manager, DVCPRO, DVCPRO50, AG-DVX100
Panasonic Broadcast & TV Systems

[Lawrence Marshall]

Jan wrote:

— I think you like others that have tried it will be very please at the results. There are numerous examples of this on the dvxuser site and the DVinfo community site as well. —

Thanks, Jan… very encouraging! I was not the poster of those comments on dvxuser.com, but will re-read the original article *much* more carefully on the specs. (wasn’t trying to throw cold water on anything or start a fight… but sure got a little discouraged reading what some posters are saying right after opening the box on my new camera!)

Larry M

[Brian]

If the HVX won’t do true 4.2.2 in HD mode, how about in dvcpro50 mode? is that true 4.2.2?

[Jan Crittenden livingston]

[brianluce] “If the HVX won’t do true 4.2.2 in HD mode, how about in dvcpro50 mode? is that true 4.2.2?”

It is true 4:2:2 in HD or DVCPRO 50.

Thanks,

Jan

Jan Crittenden Livingston
Product Manager, DVCPRO, DVCPRO50, AG-DVX100
Panasonic Broadcast & TV Systems

[Redindian]

Jan wrote:
You need to look at the part that says that the output of the chip set, which BTW is an analog signal, and pay attention to the part that says it outputs a 60P signal and in a 14Bit A/D converstion to a 19 Bit DSP it is transformed into the digital domain. From there it is recorded in the DVCPRO HD format which indeed is 4:2:2.

Do you mean to say that since its recorded as DVCPROHD it becomes 4:2:2?

Eg: If I shoot with my webcam, play it on TV, and shoot that with 35mm – it does not make the quality of the footage as 35MM.

So if the color is captured at 4:2:0, and thrusted into a 4:2:2 format – where does that unrecorded information come from?

[Brian]

okay redindian, same question then, is dvcpro50 in the hvx true 4:2:2? or faux?