🚀 go-pugleaf

Christophe MINETTI wrote:

>Yes it turns around 70 msec to get a "stable" image.
>As I have to wait at least 70 msec
>and then wait the next synchro top of the camera, I am decreasing the acquisition
>frequency. If I decrease those 70 msec, than for sure I will get a mix of two
>frames.

If you go to DirectDraw or DirectX you might be able to pick up a bit
by drawing the next frame on a hidden page while you are waiting for
the LCD pixels to turn on.
http://msdn2.microsoft.com/en-us/library/ms792915.aspx

Pre-Paint to hidden page
Loop:
WaitForBlank	less than 17ms (end of last scanline)
Flip page
Paint to hidden page
WaitForBlank	17ms
Wait for LCD	5 to 20 ms depending on LCD
Click Camera
repeat Loop.

So, if you have a gamer's LCD, and your camera can sync up and capture
within 12 ms, then you could get 30 fps
With a regular LCD, you would be looking at a maximum of 20 fps.
And if the camera is slow, 15 fps.

> I was hoping (but I think there is no way to get it) to know by any way when
>the LCD has been completely refreshed ...

No, there is no way, as that has to do with the speed of the crystals,
and not the electronics.