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Question: what Canon camera and what CHDK script for an accumulated live image o

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I am a newbe on this subject, I have used CHDK for Stacking and Motion Detection. But this is something new for me. Could you please help me on the way, thanks.


My dad has a raster electron microscope Philips sem 515. He wants to upgrade and remove the classic polaroid camera with a digital camera. The features he is looking for is hi resolution, accumulating image and a HDMI out. To accumulate the image, Is there a script ? What camera would be recommended. Here is a link to the microscope. Any advice welcome. http://www.spaceship-earth.org/REM/REM.htm

The features he is looking for is hi resolution, accumulating image and a HDMI out. To accumulate the image, Is there a script ?
I can't help much camera choices here but I'm pretty sure some of the other forum members can. 

As far as a script goes, I guess what you want to do is take many images and add them up in the camera?  The Scripting RAW Development functions seem like they might be ideal for this.

In the meantime,  here's a google search that returns a lot of related threads from this forum : 

https://www.google.com/search?q=site%3Ahttp%3A%2F%2Fchdk.setepontos.com%2F%20microscope&rct=j
Ported :   A1200    SD940   G10    Powershot N    G16

I assume the camera in question is labelled 1 in the upper left here ?
Ported :   A1200    SD940   G10    Powershot N    G16

Correct, no. 1 that's a Polaroid camera, it is also used by dentist. Now I have found (For the time being) a Powershot SX200IS with a HDMI out. The problem to solve is to make de display and more important the HDMI out presenting an accumulated image of the SEM. Would that be possible ? The problem is that the image is not presented complete as on the display right of it. It writes a beam. The camera would need to act as such as an recording oscilloscoop.
« Last Edit: 31 / December / 2014, 10:14:16 by luchtcontrole »


The problem to solve is to make de display and more important the HDMI out presenting an accumulated image of the SEM. Would that be possible ?
I think that what you are really looking for is a single long exposure sync''d to the CRT beam start?
Ported :   A1200    SD940   G10    Powershot N    G16

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Offline ahull

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If you are taking pictures of a CRT, then you will need relatively long exposures, at least as long as a single frame on the CRT, but more likely several frames would be better, so for example 1/25th Sec or slower if the CRT refresh is 25fps.

If we knew a bit more about the CRT, that might help. If the CRT has a fairly long persistence phosphor then the timing is less critical. Photographing a CRT oscilloscope for example is usually fairly straight forward as the phosphor usually has a fairly high persistence (high persistence is not good for television pictures, but great for rock steady stills).

One other question. Is there a "video out" connector on the system, if so it may be possible to digitize the image directly.
 
EDIT: Having seen the device in action here I think I will revise my shutter speed down to around the 1 second marker. More info and an even older SEM for those interested here.

One other thing that might be of interest in obtaining the best possible resolution images, there is mention of "digital storage" in the various on line articles that mention the Philips 515, so it *might* be possible to access this "digitised" output directly. This would of course give you the best possible resolution available from the device (although it takes out the fun of using CHDK and a digital camera).

If you don't mind me asking, how did you come by this toy. I've tried asking Santa Clause for one, but I was told it wouldn't fit down the chimney.
« Last Edit: 31 / December / 2014, 18:05:38 by ahull »

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Online reyalp

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Now I have found (For the time being) a Powershot SX200IS with a HDMI out.
FWIW, Canon P&S generally only drive the HDMI in playback, not shooting mode. According to the manual, this applies to the SX200. I don't know if this matters for your application, it sound like you will need to take long exposures anyway, so live view may be irrelevant.
Don't forget what the H stands for.

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Offline ahull

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If, as I suspect, there is an RCA connector for an external monitor, (aka composite out) you might be able to use a USB video capture card, something like this.

Not sure how good the results would be compared with the maximum possible resolution of the SEM.

If you do have this option, there are lots of similar devices used in the IPTV world, used to stream analog video sources to the digital TCP/IP domain, search for MPEX card. If you need more information, let me know, for what it is worth IPTV is the field I am currently employed in.

If you go for the slow scan/CHDK/photo option, then I would suggest using CHDK-PTP and some LUA  scripting to let you capture sequences of long exposures on your Canon. This will almost certainly prove to give the highest quality and most repeatable results.

Exploring both avenues might give you all you need. Digitized video for sample set up and alignment and digital stills from the CRT for highest resolution.
« Last Edit: 31 / December / 2014, 22:07:42 by ahull »


Short answer - you probably are not going to be able to do this "in camera".  Or want to.  Some sort of PC solution for the image processing probably makes a lot of sense.
Ported :   A1200    SD940   G10    Powershot N    G16

I am puzzled... I will dig in to the manual. We don't want to loose the resolution. My dad bought it second hand and it was broken. He repaired it and now he wants to upgrade it. A sem like that is not too much expensive..

http://www.medwow.com/used-scanning-electron-microscope/philips/sem-515/570977796.item

 

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