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triggering flash with an Arduino?

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Offline ottokar

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Re: triggering flash with an Arduino?
« Reply #10 on: 19 / June / 2017, 13:01:36 »
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thank-you both.

Andrew - it seems that we are both interested in the same thing, body scanning, with a double take - once with noise and once without, where the 2 takes are as close together in time as possible - is that right?

 You seem to have been interested in this for a few years now, may I ask if you have made any progress in the last few years?

 (My situation is, I've recently got into all this, I have just recently got about 12 various chdk cameras, so I just want to try some experiments with face scanning to start with.)
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Offline andrew.stephens.754365

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Re: triggering flash with an Arduino?
« Reply #11 on: 19 / June / 2017, 14:35:06 »
Quote from: ottokar on 19 / June / 2017, 13:01:36
is that right?
Definitely.

Quote
may I ask if you have made any progress in the last few years?
I can see how it could appear as painfully slow but, yes, i'm more than happy with the current situation. I now have 66 little sx150is and a tcp/ip (currently draft n wifi but perhaps gige soon) based system (written in AutoIt) to control multiple instances of a customised cli multicam.lua (each instance on a separate netbook to control one "pole" of 8 camertas).

It took quite a while to study some of the chdkptp source code to get sufficient comfort to develop that "sophisticated work" the way I wanted & while i'm still no expert I can generally get it to do what I want or ask a (mostly) sensible enough question on the forum to have it sorted out. I feel much more comfortable with that approach but there are other, perhaps, more pragmatic approaches (e.g. user mphx's defining ptp trigger based multicam build).
 
Quote
(My situation is, I've recently got into all this, I have just recently got about 12 various chdk cameras, so I just want to try some experiments with face scanning to start with.)

I still find the subject fascinating but this bit is a little more embarrassing for me ... I still haven't done a single scan so you are probably well ahead of me in that regard. I've always just thought that perfecting, as best as possible, the image acquistioin system would be followed, relatively straightforwardly, by photoscan / capturingreality processing. I hope i'm right. For what I want I think i'll have both continuous light and 2 stage flash capture for different situations but purchase orders have not yet been placed.

I imagine multiple camera types could lead to increased variability in the spread of timings in the diagram referenced in the post above.

In case you are not aware - if your cameras have a 3rd battery terminal (for temperature sensor), that can be used to implement the usbremote switch - user Karmaschinken's posts has details.
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Offline Hardware_Hacker

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Re: triggering flash - "structured light" & Disposable (Single Use) Film Cameras
« Reply #12 on: 19 / June / 2017, 20:52:21 »
Quote from: ottokar on 19 / June / 2017, 13:01:36
..... - it seems that we are both interested in the same thing, body scanning, with a double take - once with noise and once without, where the 2 takes are as close together in time as possible - is that right?
 .....
 (My situation is, I've recently got into all this, I have just recently got about 12 various chdk cameras, so I just want to try some experiments with face scanning to start with.)
Re:- SYK-3 Sensor or similar Photoflash Slave devices for "...double take - once with (structured light) noise..."
Some time a go I had a part time job repairing Braun Flashes and also constructed quite a lot  Photoflash Slave Triggers.
As this involves working with High Voltages I won't post any Details on the simple method's I used.

If you have only a Micro Budget you can re-purpose "Disposable (Single Use) Film Cameras" I just ask a local Film Processing Lab
to keep some for you, there are only a few brands and variations, and some are more useful than others.

There a lot's of ways the "Single Use Film Cameras" can be used as part of a DIY structured light projector array.
The main reason for using the "SU-FC" are the  low cost and the "Synce'd" high intensity light pulsed output.

Some examples are (and for this post, the required modification details, are omitted):-

## With a obsolete 35mm Slide Projectors and/or just a "Triplett" (style) 35mm Slide Projection Lense.

## With a obsolete, back-lit, LCD Monitor using a "Triplett" 35mm Slide Projection Lense.

## With, a modified, "Cheap" Low Resolution LCD Digital Projectors, that are available on ebay etc.

## With, a modified, "Cheap" Low Resolution LCoS Digital Projectors, that are available on ebay etc.

## With, a modified, "Cheap" Low Resolution DLP Digital Projectors, that are available on ebay etc.

## With, a modified, "Expensive" High Resolution DLP Digital Projectors, that are available on ebay etc.

Note that you have two further structured light, Visible and Infrared  projection options.

On the Camera array side I am experimenting with Visible and Infrared  CHDK Cameras and a SDM style Mirror Box.

I.e. with an array of Visible and IR Stereo Camera (Photo-Scan camera) Pairs,
the advantage of the Vis-IR pairs are, that no delay's are required, so the camera array sync is excellent.

H-H

Ref: SDM style Mirror Box .... link to-do.

@  ottokar if you after more Legacy CHDK Cameras, I have some available; location Australia.
« Last Edit: 19 / June / 2017, 21:34:02 by Hardware_Hacker »
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Offline ottokar

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Re: triggering flash with an Arduino?
« Reply #13 on: 20 / June / 2017, 21:41:04 »
Hi H-H - about the legacy cameras, I'm in England, so I presume transport and taxes would make it prohibitive.

 About your project, I don't fully understand but I am very curious. I have some questions to help me understand what you are saying ...

1) you want to use visible light for texture, and the IR to (help) build the mesh geometry?

2) you need perfect sync because you are photographing a person, who cannot keep perfectly still?

is that right so far?

Andrew - your posts on this forum and the photoscan one are constantly full of new ideas and methods. Surely if you started scanning too, you would have even more stimulus for even more ideas, as well as experience to cull out the bad ideas? you need to get started and see where it leads.

 I haven't scanned any people yet, will hopefully set things up this week, then ask a friend to come round and be the guinea pig next week,

andrew
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Offline Hardware_Hacker

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Re: triggering flash with an Arduino?
« Reply #14 on: 22 / June / 2017, 20:59:17 »
Quote from: ottokar on 20 / June / 2017, 21:41:04
Hi H-H - about the legacy cameras, I'm in England, so I presume transport and taxes would make it prohibitive.
I have bought some camera related stuff on ebay from UK and Europe, I found that the UK-Post and De-Post were very low cost
delivery option. Using the Jp-Post  Aust-Post service's is also very good for Asian ebay stuff so I think Au-Post is also a good
and low cost option. There is no export GST (VAT) as the low cost "Exemptions" have now been extended to July 2018.

Quote from: ottokar on 20 / June / 2017, 21:41:04
About your project, I don't fully understand but I am very curious. I have some questions to help me understand what you are saying ...

1) you want to use visible light for texture, and the IR to (help) build the mesh geometry?

2) you need perfect sync because you are photographing a person, who cannot keep perfectly still?

is that right so far?

Yes

H-H
« Last Edit: 22 / June / 2017, 21:16:46 by Hardware_Hacker »
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Offline ottokar

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Re: triggering flash with an Arduino?
« Reply #15 on: 03 / July / 2017, 04:08:15 »
Hi H-H,
 well, I might be interested in the legacy cameras, but I am on a micro-budget at the moment, under £10 per camera.
 There will be import duty to pay when the cameras enter the UK, up to 40%.
 Anyway, I will send you a PM asking for more details,
thanks,
Andrew
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