4:4:4 10bit single CMOS HD project

[Jason Rodriguez]

Hey Obin,

That does work to a point, but it would be nice again to have a custom viewLUT, to sort of preview how you want things to look. A custom viewLUT could simply be a custom RGB curve (that adjusts all three channels the same, not necessarily differently for each channel) that's accessed from a tab-deliminated text file for values from and to (like an initial value of 10 gets mapped to 20, etc.).

[Jason Rodriguez]

Obin,

How did you latest version of CineLink turn out?

[Obin Olson]

ok...we are having issues with re-draw because of the non-use of hardware for screen draw..the 1/4 screen color preview is great but the windows redraw is really bad..working on that now

[Jason Rodriguez]

Are you getting any delays (you know, when you pan, etc. the screen preview is behind the camera motion) in your on-screen preview?

BTW Obin, what format is CineLink outputting? Is it a RAW format, or something else with a custom header?

[Obin Olson]

not much delay at all...I think that issue is fine
RAW data output

[Jason Rodriguez]

Sorry, don't mean to beat a dead horse, but would you say 1-2 frames behind in delay, or 5-7+?

[Obin Olson]

best guess is 1-3 frames from what i have seen( I have been loaded with work and not much time for testing) I will do some things in the morning and see how it looks..and try the new bayer filter..we may work with DirectX for a faster screen refresh in CineLink..not sure yet..

[Jason Rodriguez]

Yah Obin, do some tests . . .

if it's 1-3 frames, that's quite good, especially if it's towards the 1 frame mark :)

BTW, what's the new bayer filter?

[Obin Olson]

not even sure yet!

I will see today :)

Rob or Rob..why are we getting what I call image shear with camera movement like a pan on the preview with color bayer? its like the image is sliced up when you pan the camera..what causes this and how can it be fixed?

TIA for your help

1/4 pixel quad preview works well! but this image "shear" is bad...btw it is much better at 1/15 shutter speed...is this a clue?

[Rob Lohman]

I haven't got a camera so I can't see what it would be, but it
sounds like a simple rolling shutter issue? Although at 1/15 it
should be more worse, not less.

[Obin Olson]

no no not that at all..it's an issue with redraw I think..

it is the screen not refreshing completely before the
picture is totally displayed and the next frame being superimposed on the
previous. I will try to force a refresh after dumping things to the screen
this might help somewhat.

...from Luc

[Rob Scott]

Obin Olson wrote:
Rob or Rob..why are we getting what I call image shear with camera movement like a pan on the preview with color bayer? its like the image is sliced up when you pan the camera..what causes this and how can it be fixed?

You could try double-buffering.

[Jason Rodriguez]

I don't think that's "sheer", I think it's more like "tearing", like when you're trying to run a video game and it's not keeping up with the refresh on the screen.

If that's the case, then it might have to do with not using DirectX or the video hardware and trying to do too much in software.

[Jason Rodriguez]

<<<-- Originally posted by Rob Scott : You could try double-buffering. -->>>

Isn't double-buffering a hardware issue though? I thought Obin said he's doing this all in software, hence no double-buffer (unless you program one).

[Rob Scott]

Jason Rodriguez wrote:
Isn't double-buffering a hardware issue though?

Possibly, but in software you still have to indicate when you're done with buffer A and are starting on buffer B. IOW, the system won't magically know when you're finished with one frame and are starting on the next one.