Infoseite // "Pixel-shift" - how does that?

Frage von Martin:


Hello,

The JVC GZ-HD 7 is supposed to be about "Pixel Shift" Resolutionvon the full 1920 x 1080 pixels, even though the pixel CCDs only 3x530.000 create. Be pixels high as expected, the sensor is somehow delayed and repeatedly exposed, or what is the whole?

Perplexed,
Martin



Antwort von Markus:

Hello Martin,

a well-understandable explanation is the very bottom here.



Antwort von Martin:

"Mark" wrote: a well-understandable explanation is the very bottom here.
Huh, that's a strange design on this page - the text had to be first in a word processing program, copy, read before he was ...

First, many thanks for the hint, my understanding is slowly increasing. Nevertheless, I believe that this is window dressing, especially when some people of the "full HD resolution" swarm. My account:

A "Full-HD television has 1920 x 1080 = 2073600 pixels. Each pixel should be as each and every color brightness can represent. In the RGB model could then eg 8 +8 +8 bits per pixels.

A camera with 3 CCDs divides the RGB color space into its components. Let us look at the exterior colors that are mentioned in the Camera 3 x 530000 = 1590000 pixels, ie 77% of the pixels required for full-HD. What is missing in the bill but still the color. A sensor with 1440 x 1080 pixel full-delivers at least 75% of the total required information, including color.

Eyewash synonymous, because as black and white movies on the idea could come to use this camera, because they're "Full HD" offers. And black filmmakers tend to use color filters increase contrast. This eventually leads to the fact that only one of the three sensors used at all, hence the resolution no higher than the 530,000 pixels can be.

Very dubious. Presumably there will be so, my theory that one thing, the practice but the other is, and the camera performs quite well. We will see ...

Greeting
Martin



Antwort von wolfgang:

Yes, it is rather the case that this theory is. With the Pixelshifterei Panasonic has started at some point, it must be so by the time of the MX350 been. Next we went into the HVX200, and now comes in the JVC Everio so.

That must now do not be bad times, because apparently the final quality of different things anyway is determined - the optics, the chips, image processing, etc. And there seems to be in all of today's HD camcorders wildly around interpolated.

Especially with the Everio are still many questions unanswered - full HD on the disk in m2t is already known, synonymous, that the chips as progressive 1080p be read on the plate but only 1080i will be written. But the big question is surely whether the chip in 1080 60p/50p out, or whether the only 25p will be made. The latter would probably be the achievable image quality of her rather rotten.

Basically, I always wonder why this device is not identical with higher data rates and 1080 50p - after Pixel Shifting halt - at the plate aufzeichnetl. The times would be really a good thing.



Antwort von Markus:

"Martin" wrote: A "Full-HD television has 1920 x 1080 = 2073600 pixels. Each pixel should be as each and every color brightness can represent.
That each pixel independently of the surrounding brightness and each can represent any color, is in practice irrelevant. After all, most (professional synonymous) HD format less image information than the full-HD Resolutionvorsieht. Especially when the color makes the apparent brightness on the resolution also to 4:2:2 or 4:2:0 is compressed ...

"Martin" wrote: What is missing in the bill but still the color. A sensor with 1440 x 1080 pixel full-delivers at least 75% of the total required information, including color.
... so that adjacent pixels s.Television although that may have different magnitudes, but in a coarser grid the same color which (have).

For more information about:
Was genau bedeutet Chroma 4:2:2

"Martin" wrote: Was genau bedeutet Chroma 4:2:2

And black filmmakers tend to use color filters increase contrast. Was genau bedeutet Chroma 4:2:2


Who on video recording and the final result presented in black and white, you Was genau bedeutet Chroma 4:2:2

can change the contrast by color synonymous in the Postpro make thus free of any optical filter in front of the camera. Synonymous This has the advantage that everything can be very precisely adjusted. And because the color brightness to any separately stored, has an immediate recording in s / w not synonymous advantage.

PS: I wonder why you're so upset about. You will of no one but forced a camcorder to buy, its technical features you do for eyewash. - Or maybe it? ;-)



Antwort von Martin:

"Mark" wrote: PS: I wonder why you're so upset about. You will of no one but forced a camcorder to buy, its technical features you do for eyewash. - Or maybe it? ;-) '

I am so busy for so long ;-)

I would like to stop the hype to understand the message behind the lies that the "first camera with full HD recording is. So now I just note that this is pure marketing and nothing about the picture quality compared to states such as HDV ...

In fact, I stand before the purchase of an HD camera, but times will wait and see how the JVC and Canon so against Sonybewährt. Especially Lowlight, the JVC, it is believed of the article you cited, much better than anything else.

Greeting
Martin



Antwort von Jan:

This is probably different depending on the company at Sony Can mans define something like ..

The green CCD / CMOS is accurate by half a pixel of the red / blue offset installed. The horizontal difference then you get twice the brightness resolution.

1080 x 960 + Pixel Shift = 1080 x 1920 - downkonvertiert to 1080 x 1440 in the Camera.

VG
Jan