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kdums1
May 17, 2005, 10:02:10
I use an external trigger and MemorySnapImage to get an image. This triggered picture often happens to be some kind of distorted. It looks as if the lower half of the image is split vertically in two halves and these parts are than exchanged.

I'm not sure if the whole picture is the one I triggered. Maybe it is some kind of artefact from the previous one.

Anyway, this is not acceptable. How can I avoid this?

kind regards,
Klaus Dums

Stefan Geissler
May 17, 2005, 14:10:58
Hello Klaus,

probably your trigger pulses come to fast. Depending of the type of camera you use, you get double exposure on the image.
If you use a SONY DCam camera, you can trigger not with the full frame rate. The trigger pulses must be a little bit slowlier e.g. a SONY XCD-X710 can be triggered only with maximum 29.7 Hz in my experience.

kdums1
May 17, 2005, 15:36:18
Thanks for your quick answer.

I'm waiting for a trigger quite a while (at least some seconds). After the triggered image I take a second shot as soon as possible without a trigger.



Best regards,
Klaus Dums

Stefan Geissler
May 17, 2005, 17:16:26
Hello Klaus,

Please have a look on your trigger puls with an osciloscope. The camera reacts on a falling or rising edge. If your signal is not clean enough, then you can get multiple triggers. I had this problem in the past.

kdums1
May 17, 2005, 17:20:35
Thanks, I'll investigate that.

kind regards,
Klaus Dums

kdums1
May 27, 2005, 11:57:57
Hi!

I think we talk about different things. If you say double exposure you mean to take two shots one over the other so you get a 'ghost'-image.

My problem is a distortion like that:

12345678
12345678
56781234
56781234

This depicts an raster image with 4 rows and 8 columns.
The lower half of the image is kind of rotated.

This happens even in Live-Mode sometimes.

kind regards,
Klaus Dums

Stefan Geissler
May 27, 2005, 12:10:39
Hello,

This sounds to me, that packages are lost through the transfer. Could you provide an image of this to support@imagingcontrol.com?