DIGIC DVII processor and HDMI output at DVinfo.net

Euisung Lee · December 11th, 2007, 12:27 AM

Hi all
Sorry if this has been asked and answered before but does anybody know if you get 1920x1080 or 1440x1080 res when you do a live capture via HDMI to bypass HDV and capture 4:2:2 clip?

First I thought it'd be 1920 width because HV20's CMOS is the full raster sensor, but Canon's ad says that their DiGiC DVII chip (used by pro and consumer HD cameras) processes image at 1440x1080 4:2:2, which leads me to suspect that you'll get 1440 width image via live HDMI stream.

Increased chroma sampling and bypassing HDV artifact are big boost in quality but I was hoping that resolution would also full 1920 pixels wide. If you've tested HV20 with intensity card for HDMI capture can you confirm the resolution?

Thanks

Eugenia Loli-Queru · December 11th, 2007, 01:01 AM

AFAIK, capturing by HDMI it's 1920x1080

Euisung Lee · December 11th, 2007, 03:02 AM

That's one positive answer. Thanks.
So I guess the image is captured as 1920x1080, but then the question would be if it's true 1920 or simply a 1440 expanded to 1920.

Euisung Lee · December 11th, 2007, 05:42 AM

I downloaded Derek Green's screen grabs from his thread (http://dvinfo.net/conf/showthread.php?t=94079) and examined the uncompressed frame.

Attached image is the 400% blow up of the diagonal line from the red drill of 'uncompressed.tif' original. I wonder that subtle staircasing implies that the image was processed as 1440x1080 internally. I have to admit that it's pretty negligible but I guess I'm just curious about what the live HDMI out really is. ;)

Dale Backus · December 11th, 2007, 11:19 AM

It is definitely full 1920... as is been discussed many times on the boards. 1920x1080 at 4:2:2... i think the staircasing you're seeing, if that is indeed an uncompressed file is probably because it's 4:2:2 8bit and not 4:4:4 10 or 12 bit. Nonetheless the HV20 going out HDMI at 1920 4:2:2 is an exceptional image for the price, i've never seen anyone deny that.

Dale

December 11th, 2007, 12:27 AM	#1
Euisung Lee Regular Crew Join Date: Apr 2006 Location: San Francisco, CA Posts: 57	DIGIC DVII processor and HDMI output Hi all Sorry if this has been asked and answered before but does anybody know if you get 1920x1080 or 1440x1080 res when you do a live capture via HDMI to bypass HDV and capture 4:2:2 clip? First I thought it'd be 1920 width because HV20's CMOS is the full raster sensor, but Canon's ad says that their DiGiC DVII chip (used by pro and consumer HD cameras) processes image at 1440x1080 4:2:2, which leads me to suspect that you'll get 1440 width image via live HDMI stream. Increased chroma sampling and bypassing HDV artifact are big boost in quality but I was hoping that resolution would also full 1920 pixels wide. If you've tested HV20 with intensity card for HDMI capture can you confirm the resolution? Thanks

December 11th, 2007, 05:42 AM	#4
Euisung Lee Regular Crew Join Date: Apr 2006 Location: San Francisco, CA Posts: 57	I downloaded Derek Green's screen grabs from his thread (http://dvinfo.net/conf/showthread.php?t=94079) and examined the uncompressed frame. Attached image is the 400% blow up of the diagonal line from the red drill of 'uncompressed.tif' original. I wonder that subtle staircasing implies that the image was processed as 1440x1080 internally. I have to admit that it's pretty negligible but I guess I'm just curious about what the live HDMI out really is. ;) Attached Images

December 11th, 2007, 01:01 AM	#2
Eugenia Loli-Queru Major Player Join Date: Jun 2007 Location: Bay Area, CA, USA Posts: 348	AFAIK, capturing by HDMI it's 1920x1080

December 11th, 2007, 03:02 AM	#3
Euisung Lee Regular Crew Join Date: Apr 2006 Location: San Francisco, CA Posts: 57	That's one positive answer. Thanks. So I guess the image is captured as 1920x1080, but then the question would be if it's true 1920 or simply a 1440 expanded to 1920.

December 11th, 2007, 11:19 AM	#5
Dale Backus Regular Crew Join Date: Nov 2006 Location: Cary, NC Posts: 132	It is definitely full 1920... as is been discussed many times on the boards. 1920x1080 at 4:2:2... i think the staircasing you're seeing, if that is indeed an uncompressed file is probably because it's 4:2:2 8bit and not 4:4:4 10 or 12 bit. Nonetheless the HV20 going out HDMI at 1920 4:2:2 is an exceptional image for the price, i've never seen anyone deny that. Dale