1440 or 1920 - Page 2 - Techwatch: Satellite TV forums, FTA, Cable, Hardware, & Tech forums

sm_17 · 16-03-07, 04:46 AM

I thank you for repenting before I had time to read that post about horizontal vs vertical... I was feelin the need to tear someone a new hole near their hind quarters.

On a lighter note there are things the human eye doesn't pick up on that are taken into consideration for many of the higher quality Compression algorithms. Contrast calculations, things that are moving get higher priority than those that don't i.e. areas of high pixel variance/activity are key framed more often.

Remember that the eye has a very small area in which it can focus on something. The eyes constantly move back and forth and up and down and the brain comprehends all these different areas and puts them together.

There are all kinds of studies on the human I that would amaze people. A favorite of mine is this here.

For all those that think they are wiz kids with colors (I myself have claimed this) I feel I have a very sharp eye for color and contrast. Even the most gifted of people will be fooled by this one. WHY? well we all have something in common. We are human.

Square A and Square B are the EXACT same color. don't believe me.. pull this image, completely unedited and grab a sample chunk of A and slide it across to the B area. Be amazed

Go here for the study and more illusions
http://web.mit.edu/persci/people/ade..._illusion.html

toni1 · 16-03-07, 09:11 PM

Nice demo of illusion thanks
Perception is also a "cognitive" function (brain)
its a good example of how perception processing is complicated.
Quality Image perception is something complexe :
Resolution is important (you can see it in hd camcorders compared to SD)
But resolution is not all
In camera processing the signal contribute to perceived quality (like contrast rate , edge inhancing, colore space reproduction processing and quality : that manufacturers uses like canons digix for example)

toni1 · 17-03-07, 03:07 PM

On what kind of display (size resolution) are you going to look your hd video on is a very important thing.
Video very high high resolution like 1920 1080 will only be visible ( perceived ) if display is big enough. A 19 inches or 21 inches PC monitor is not a sufficient size to see the difference between 720 and 1080 resolution.

Some other factors are also important like the in camera processing quality of the video ( inhancing, sharpening, color processing)
If you want to project your video on a big wall then camera resolution and projector resolution (and processing quality + other ) are important elements .
Like I’ve said on post before ; its the outcome that is important (on video charts or on real life user opinion )

For more information

http://www.hometheatermag.com/gearworks/0105viewvrez/

http://www.carltonbale.com/2006/11/1080p-does-matter

Savagerush · 29-03-07, 04:05 AM

That's a great illusion...hahaha. Go figure..I thought I was pretty good with the old colors too...

lovehateHDV · 29-03-07, 07:02 AM

"I thank you for repenting before I had time to read that post about "

Most grateful for leaving me with just one opening in the past quarters.

What ever the resolution is - we are far from the possible 1440 x 1080 lines. I wonder how will RED fare in the test of actual lines discernable.

WizardKT · 05-04-07, 02:34 PM

Interesting, but all things being equal I would rather have a lower horizontal rez if the camera has better picture quality than a true HD camera.

Jake Ironshirt · 05-04-07, 03:35 PM

Quote:

Originally Posted by jaelupo

The HDV compression used by the HV10 and HV20 is an industry standard. This standard maximum save format of 1440x1080. Both the HV10 and HV20 can capture 1920x1080 but the HDV compression downgrades the signal. This is not a limitation on the tape itself it is a limitation of the standard. There is only one way to get true 1920x1080 resolution out of the HV20; use an HDMI capture card with the HV20 and record straight to a computer (this will not work with the HV10- no HDMI). Some people here have said you can use a 3:2 Pulldown in your video editing software to achive full 1920x1080 but I don't find that to be true. 3:2 pulldown affects the frames per second (Converts 24p to 29.97) it does not convert 1440x1080 to 1920x1080.

My Sony HDTV has a 3:2 pull down function that is automatic. Would playing back footage from the HV20 have any effect on the viewing?
Thanks
Jake

jaelupo · 05-04-07, 04:09 PM

Jake,

I am not sure how the HV20 will work with that TV. You will just have to get one to try it. I am sure it will not be a problem.

Jae

toni1 · 05-04-07, 09:34 PM

jake,
what is the native resolution of your sony HDTV ?

Jake Ironshirt · 05-04-07, 11:18 PM

Quote:

Originally Posted by toni1

jake,
what is the native resolution of your sony HDTV ?

768p, 1366x768, on a Sony KDF-E60A20


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16-03-07, 04:46 AM	#11 (permalink)
sm_17 Junior Member Join Date: Mar 2007 Location: Commerce TWP, USA Posts: 5 Thanks: 0 Thanked 0 Times in 0 Posts	I thank you for repenting before I had time to read that post about horizontal vs vertical... I was feelin the need to tear someone a new hole near their hind quarters. On a lighter note there are things the human eye doesn't pick up on that are taken into consideration for many of the higher quality Compression algorithms. Contrast calculations, things that are moving get higher priority than those that don't i.e. areas of high pixel variance/activity are key framed more often. Remember that the eye has a very small area in which it can focus on something. The eyes constantly move back and forth and up and down and the brain comprehends all these different areas and puts them together. There are all kinds of studies on the human I that would amaze people. A favorite of mine is this here. For all those that think they are wiz kids with colors (I myself have claimed this) I feel I have a very sharp eye for color and contrast. Even the most gifted of people will be fooled by this one. WHY? well we all have something in common. We are human. Square A and Square B are the EXACT same color. don't believe me.. pull this image, completely unedited and grab a sample chunk of A and slide it across to the B area. Be amazed Go here for the study and more illusions http://web.mit.edu/persci/people/ade..._illusion.html

16-03-07, 09:11 PM	#12 (permalink)
toni1 Senior Member Join Date: Feb 2007 Location: France Posts: 123 Thanks: 0 Thanked 0 Times in 0 Posts	Nice demo of illusion thanks Perception is also a "cognitive" function (brain) its a good example of how perception processing is complicated. Quality Image perception is something complexe : Resolution is important (you can see it in hd camcorders compared to SD) But resolution is not all In camera processing the signal contribute to perceived quality (like contrast rate , edge inhancing, colore space reproduction processing and quality : that manufacturers uses like canons digix for example)

17-03-07, 03:07 PM	#13 (permalink)
toni1 Senior Member Join Date: Feb 2007 Location: France Posts: 123 Thanks: 0 Thanked 0 Times in 0 Posts	On what kind of display (size resolution) are you going to look your hd video on is a very important thing. Video very high high resolution like 1920 1080 will only be visible ( perceived ) if display is big enough. A 19 inches or 21 inches PC monitor is not a sufficient size to see the difference between 720 and 1080 resolution. Some other factors are also important like the in camera processing quality of the video ( inhancing, sharpening, color processing) If you want to project your video on a big wall then camera resolution and projector resolution (and processing quality + other ) are important elements . Like I’ve said on post before ; its the outcome that is important (on video charts or on real life user opinion ) For more information http://www.hometheatermag.com/gearworks/0105viewvrez/ http://www.carltonbale.com/2006/11/1080p-does-matter

29-03-07, 04:05 AM	#14 (permalink)
Savagerush Junior Member Join Date: Mar 2007 Location: Tampa, USA Posts: 5 Thanks: 0 Thanked 0 Times in 0 Posts	That's a great illusion...hahaha. Go figure..I thought I was pretty good with the old colors too...

29-03-07, 07:02 AM	#15 (permalink)
lovehateHDV Senior Member Join Date: Feb 2007 Location: Seattle, Earth, Milky Way, the 4D Universe Posts: 171 Thanks: 0 Thanked 0 Times in 0 Posts	"I thank you for repenting before I had time to read that post about " Most grateful for leaving me with just one opening in the past quarters. What ever the resolution is - we are far from the possible 1440 x 1080 lines. I wonder how will RED fare in the test of actual lines discernable.

05-04-07, 02:34 PM	#16 (permalink)
WizardKT Junior Member Join Date: Apr 2007 Location: Ann Arbor, USA Posts: 3 Thanks: 0 Thanked 0 Times in 0 Posts	Interesting, but all things being equal I would rather have a lower horizontal rez if the camera has better picture quality than a true HD camera.

05-04-07, 04:09 PM	#18 (permalink)
jaelupo Member Join Date: Feb 2007 Posts: 85 Thanks: 0 Thanked 0 Times in 0 Posts	Jake, I am not sure how the HV20 will work with that TV. You will just have to get one to try it. I am sure it will not be a problem. Jae

05-04-07, 09:34 PM	#19 (permalink)
toni1 Senior Member Join Date: Feb 2007 Location: France Posts: 123 Thanks: 0 Thanked 0 Times in 0 Posts	jake, what is the native resolution of your sony HDTV ?