HVX200 resolution of the camera section

NBC, what is the DVX ? Less than 480 ? If this camera used native 720 chips, wouldn't it be at or above 720 ?
 
Just because the CCDs have a certain resolution pixel-count, it doesn't mean you'll actually get that on tape (er, memory). You still have to go through the lens, the prism, and the signal processing electronics and compression. By the time you're finished with all that, your aggregate horizontal resolution drops. Horizontal resolution takes into account the entire imaging system. It is a measure of how many black and white vertical line pairs can be resolved when shooting a chart.
 
650 x 1.7777 (Lines is lines per picture height, remember) = 1155, which is just shy of 1280, the max horizontal rez DVCproHD will record.

Graeme
 
Hi Graeme,

I dont understand the 1.7777 factor...
What does it mean ?
Does it mean it will display "real" 1155 horizontal definition ?

thanks
 
16:9 is 1.777. The 650 number means 650 horizontal lines per picture height. Therefore, if it has 650 lines rez, that would mean 1080x1155 rez approx, which is very near 1080x1280 which is DVCproHD.

Graeme
 
Graeme,

sorry, maybe because of my bad english, but i really dont understand...
doesn't stretching 650 lines horizontally just makes thses lines "larger" by a 1.7777 factor ?

OK...so what do you mean by "picture height" ?

thanks for your patience
 
http://www.adamwilt.com/TechDiffs/Sharpness.html

Look at the "lines and pixels" paragraph, and it'll explain. Basically when discussing "TV Lines" of resolution, the standard is not to discuss the full frame, but a square patch of that frame, and the width of the patch is defined by the height of the patch. So it becomes lines "per picture height". In a square-pixel system like HD, the very absolute maximum resolution possible in a 720p system would be 720 TV Lines.
 
That helps a lot. I just got thrown off because I think someone said the Sony Hd camera resolves around 800 lines. And then I see a lower number for the HVX200 and think: What am I doing wrong here, there is no way the HVX is not going to at least be equal to the Sony.

This reminds of the Mbs/MBs thing. I never did understand that until you explained it one time Barry.

Thanks as always.
 
Resolving of lines, however, doesn't tell you how well those lines are resolved, however. DVCproHD has lower resolution than other high def formats, but this could actually lead to better perceived definition, and hence better looking picture.

Graeme
 
Graeme - That is all that matters really (the actual picture). I guess because all I have shot is film, my only reference to video quality is lines per resolution. I know that is not correct, but it is so hard to pick this stuff up.

I guess renting the camera and blowing up (to film) the results would be the only way to determine if it fit my needs.
 
You're right that it's the actual picture that matters. And "resolution" is no determination of quality! You could put a VHS camera's footage on HD tape, and it's now got HD resolution, but it still has VHS definition!

Graeme
 
he he , i'll have to take an english course...

lines per picture height=horizontal lines in a square patch of frame.

thanks guys
 
All of us who were around when S-VHS was announced know about this. The trade magazines and lab tests were speaking of S-VHS resolution exceeding Beta-SP. Well when the cameras and recorders were in the field it was very clear that lab tests and pleasing pictures were two different things.
 
Indeed SVHS has superior luma resolution to BetaSP, just as DV as much superior luma rez to both SVHS and SP, but rez is not everything. SP is much more stable and less noisey than SVHS, and hence looks better. DV is incredibly stable, and has little noise, and it's higher rez makes it look great.

However, with HD, we see a lot of resolution figures thrown around without people actually looking at the picture produced. High Definition is high definition, not high resolution. Resolution is easy - definition is not!

Graeme
 
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