PDX10, TRV950 widescreen target area?

Ignacio Rodriguez · July 5th, 2004, 07:33 PM

> How would you implement an 1.743956737 pixels to one
> mapping? It might not be possible at all because there simply
> isn't any usable x-to-y mapping.

Interesting that you mention it, a pretty sophisticated resampling must be going on if the CCD chips have square pixels, since DV has non-square pixels, both in 4:3 and in 16:9 modes.

Ralf Strandell · July 6th, 2004, 07:58 AM

Well, maybe the CCD pixels are non-square then.

Does the CCD even have pixels?

Doesn't it just have monochromatic light detectors than have some unknown form factor. The Fuji SuperCCD SR chip, for example, has two different types of light sensors - larger and smaller. With any CCD at least three images must be taken so that color values can be recorded. Some camcorders use three CCDs while others use some sort of filtering / pixel shifting etc.

Now when there are lots of light detectors then the data they give can be processed in such a way that the image looks good on the _output_device_of_choise_ (a TV set in the case of DV tape).

A TV screen and a computer display generate the picture in slightly different ways (various forms and arrangements of those light emitting phosphor dots than make pixels). So there must be some kind of adaptation taking place somewhere...

Francesco Marano · July 8th, 2004, 07:41 AM

1) in this ccd I suppose that the distance between pixels is the same in vertical and orizzontal, so is like square sensor detection.

2) the usable ccd area is 1152 x 864 =995328

3) in NTSC 4/3 are used 960 x 720 = 691200 remapped in

960>720 (4>3) and 720 > 480 (3>2)

4) in PAL 4/3 are used 960 x 720 = 691200 remapped in

960>720 (4>3) and 720 > 576 (5>4)

Francesco

Francesco Marano · July 8th, 2004, 08:38 AM

> How would you implement an 1.743956737 pixels to one
> mapping? It might not be possible at all because there simply
> isn't any usable x-to-y mapping.

may be 1,75 to one similar to 7 to 4

----------------------------------------------------
Ciao

in 16/9 i think that the dvcam use

1152 x 648 =746496

1152 > 720 is like 8>5 (anamorfic)

PAL 648>576 10> 9
NTSC 648>486 4> 3

Francesco

July 5th, 2004, 07:33 PM	#16
Ignacio Rodriguez Contributor Join Date: Sep 2003 Location: Santiago, Chile Posts: 932	> How would you implement an 1.743956737 pixels to one > mapping? It might not be possible at all because there simply > isn't any usable x-to-y mapping. Interesting that you mention it, a pretty sophisticated resampling must be going on if the CCD chips have square pixels, since DV has non-square pixels, both in 4:3 and in 16:9 modes. __________________ Ignacio Rodríguez in the third world. @micronauta on Twitter. Main hardware: brain, eyes, hands.

July 6th, 2004, 07:58 AM	#17
Ralf Strandell Regular Crew Join Date: Jan 2004 Location: Europe Posts: 180	Well, maybe the CCD pixels are non-square then. Does the CCD even have pixels? Doesn't it just have monochromatic light detectors than have some unknown form factor. The Fuji SuperCCD SR chip, for example, has two different types of light sensors - larger and smaller. With any CCD at least three images must be taken so that color values can be recorded. Some camcorders use three CCDs while others use some sort of filtering / pixel shifting etc. Now when there are lots of light detectors then the data they give can be processed in such a way that the image looks good on the _output_device_of_choise_ (a TV set in the case of DV tape). A TV screen and a computer display generate the picture in slightly different ways (various forms and arrangements of those light emitting phosphor dots than make pixels). So there must be some kind of adaptation taking place somewhere...

July 8th, 2004, 07:41 AM	#18
Francesco Marano Contributor Join Date: Sep 2001 Location: Italy Milan Posts: 59	1) in this ccd I suppose that the distance between pixels is the same in vertical and orizzontal, so is like square sensor detection. 2) the usable ccd area is 1152 x 864 =995328 3) in NTSC 4/3 are used 960 x 720 = 691200 remapped in 960>720 (4>3) and 720 > 480 (3>2) 4) in PAL 4/3 are used 960 x 720 = 691200 remapped in 960>720 (4>3) and 720 > 576 (5>4) Francesco

July 8th, 2004, 08:38 AM	#19
Francesco Marano Contributor Join Date: Sep 2001 Location: Italy Milan Posts: 59	> How would you implement an 1.743956737 pixels to one > mapping? It might not be possible at all because there simply > isn't any usable x-to-y mapping. may be 1,75 to one similar to 7 to 4 ---------------------------------------------------- Ciao in 16/9 i think that the dvcam use 1152 x 648 =746496 1152 > 720 is like 8>5 (anamorfic) PAL 648>576 10> 9 NTSC 648>486 4> 3 Francesco