Concern about the HD 16:9 at DVinfo.net

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(MPG4) Sanyo Xacti (all models)
A compact 720p MPEG4 digital media camera recording to SD Card.


 
 
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Old March 19th, 2006, 01:16 PM   #1
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Concern about the HD 16:9

The OLED screen isn't 16:9 so naturally has black masking at the top and bottom when you're shooting in HD and 16:9.

However, the masking is semi-transparent, and one can actually see picture through it.

Does this indicate the HD / 16:9 mode is a cropped image?

If so, what ramifications might this have?
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Old April 7th, 2006, 10:36 PM   #2
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cropped is fine and is likely exactly what its doing (IE take some stillsnote they are not in 16:9)

what IS important is does it "stretch" to make the 16:9 after it crops.

I think no. I think its just "using" the 1280x720 pixels of the 5 million it has to make the HD image in which case this is just fine.

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Old April 8th, 2006, 06:18 AM   #3
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That's reassuring. I just remembered the whole 16:9 vs. True 16:9 debate, where 16:9 cropping meant res loss...
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Old April 9th, 2006, 03:56 PM   #4
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Graham,

Yup, I think its using just the real-estate required for the 16:9 no resolution loss from that....

But just how its done is still a little shady I suspect.. as there clearly is a true 5 megapix chip in the camera, this means about 2500 pixel wide source image, which is then reworked to the 1280px this "should" bring a lot of resolution with it by default, however strangely the camcorderinfo review suggest that the actual resolving power is not more than about 25% better than a good regular miniDV cam... To my confused mind this is pretty strange, the 5 meg shots I have checked clearly have more resolving power than this... and the HD comes from the same chip.. so there is no bad optical path involved...

They rated the HD1 sharpness at "21" and the Optura600 at "17" so there IS clearly a significant increase... also when shooting regular video it was rated very sharp... Honestly I do not really understand their wording... saying resolving 460 lines across, does that mean resolving 460 vertical lines..? Not that it matters really... as I said before.. IM happy with what I see on my TV. (smile)


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Old April 10th, 2006, 01:02 AM   #5
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I am used to being disappointed by the stills from a video camera, because it's usually just arbitrary frame grabbing, or by the video from a stills camera - often no more than a recording of the LCD monitor feed.

I think of the HD1 as a dedicated stills camera and a dedicated video camera.

But camcorderinfo suspect the Xacti is a still camera posing as a video camera.

All I would say is, ten years from now the two devices will not be as separated as they are in today's market.
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Old April 10th, 2006, 03:14 AM   #6
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10 years from now I bet we will have 5 10 15 MEGAPIXEL Video at which time a frame grab will print a poster :-)

I cant wait till we have affordable 30mp cameras !

Hey I can dream :-)
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Old April 10th, 2006, 03:40 AM   #7
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Yes, frame grabbing is okay in post - but video cameras that do it live, under the pretence of taking stills, will tend to make poor stills because good frames and good stills are not the same thing...
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Old April 10th, 2006, 10:20 AM   #8
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well what would be nice if if when it grabbed the frames it grabbed it at the INSTANT that you pressed the buton and also grabed every other frame for 5 frames before and after so later in post you could "pick" the best grab.

I do with it could capture a 5m still without pausing the video. that would make this camera about as close to perfect as is possible :-)

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Old April 10th, 2006, 10:43 AM   #9
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That would be nice - but the reason the stills are proper stills and not just framegrabs is because it doesn't do this, it reacts to pressing more like a regular digi still cam!
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Old May 16th, 2006, 05:34 AM   #10
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This 16:9 cropping is also discussed in this thread - suggestion that the sensor isn't fully used for 16:9 HD shooting

http://www.dvinfo.net/conf/showthrea...d=1#post483132
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