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 Camera Motion Control - Multi Axis Keyframing 
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Joined: Mon Nov 14, 2011 11:34 pm
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Post Camera Motion Control - Multi Axis Keyframing
The home straight ... Keyframing 2D/3D is possible :)

The next version will have a better 5 button interface and will (fingers crossed) drive Big Easy Drivers (2amp per Phase)

If I get this sorted would anybody be interested? I might make a few. (note: only testing the water at the moment ... no promises)


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Thu Jan 31, 2013 4:38 am
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Post Re: Camera Motion Control - Multi Axis Keyframing
Well done John,.... could be interested at the right price :)

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Thu Jan 31, 2013 6:18 am
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Post Re: Camera Motion Control - Multi Axis Keyframing
We can always swap one out for my solution :-).

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Thu Jan 31, 2013 9:38 am
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Post Re: Camera Motion Control - Multi Axis Keyframing
I'd be interested for sure! I'll pm you a few questions in a minute :)

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Thu Jan 31, 2013 3:24 pm
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Post Re: Camera Motion Control - Multi Axis Keyframing
Hi Guys, Thanks for the interest

A picture of the latest RPi stack:

Image
KEYFRAME STACK by SiriusJohn, on Flickr

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Sat Feb 02, 2013 7:38 am
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Post Re: Camera Motion Control - Multi Axis Keyframing
Very nice. I want one. I've wanted one all along.


Sat Feb 02, 2013 3:05 pm
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Post Re: Camera Motion Control - Multi Axis Keyframing
How does this compare to something like Dragonframe?

One advantage that I see if that you don't need a computer, but I was wondering if you had a comparison between the two.

Thanks

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Sat Feb 02, 2013 4:41 pm
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Post Re: Camera Motion Control - Multi Axis Keyframing
sciencelookers wrote:
Very nice. I want one. I've wanted one all along.


Hi James, thanks. Still trying to sort these Big Easy Drivers ;)

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Sun Feb 03, 2013 2:46 am
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Post Re: Camera Motion Control - Multi Axis Keyframing
diputs wrote:
How does this compare to something like Dragonframe?

One advantage that I see if that you don't need a computer, but I was wondering if you had a comparison between the two.

Thanks


Hi diputs, I have not really tried to compare. Dragonframe is an excellent piece of software from what I have seen. Very flexible and a brilliant interface re MoCo. I thought about buying at one stage.

I did have a pc based system working under windows but I found it too cumbersome and power hungry for time lapse. Memories of trying to keep it going in high winds!

So what I have been trying to produce is a robust, simple purpose built unit. One that can be used irrespective of conditions and location. Also it has to be cheap. The base components in the current version cost 80USD ex build time shipping case etc. All the background enabling software is open source. i like the thought that underneath it is based on community based software and concepts. The keyframing programme is purpose built and tuned to the base software/ hardware. It's an embedded system so the unit is self contained and boots straight into the keyframing programme.

I am still working on the interface and functionality. Getting there but a way to go yet. It has limitations but I think it will do the job I want.

Hope this explains. Happy to discuss further .

John

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Sun Feb 03, 2013 2:58 am
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Post Re: Camera Motion Control - Multi Axis Keyframing
Been watching with great interest over the last few months! Very interested!

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Sun Feb 03, 2013 3:35 am
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Post Re: Camera Motion Control - Multi Axis Keyframing
Hi John,

This looks like exactly what I've been searching for! I was thinking that I would have to develop something myself, but it seems you've done the hard work for me :)

Do you have any more information about the latest verson and the possibility of getting hold of one of these?

Simon


Thu Feb 14, 2013 5:32 am
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Post Re: Camera Motion Control - Multi Axis Keyframing
Hi ToweringPictures, many thanks for the interest! Still sorting but should get there eventually. Not working on it today though ..... weather too good in Manchester. :-)

Hi Simon, Also thanks for the interest!

At the moment I am still working on the new version. The old one I have been using relies on analog (rotary) definition of axes. I developed it that way at the time to deliver realtime layering I.e the overlaying of axis speed profiles. Now I am attempting true keyframing I am moving to 4 button axis input and select (if that makes sense). This will allow better definition of keyframes. You define speed in a different way with this method. I am also trying to convert to more standard stepper drivers, which I also think you can also do with true keyframing.

So to cut a long story short .... It's really still work in progress.

The core keyframing functionality is proven (on my old unit) ... I now just need to get the new unit finished to see if the whole thing works as intended. It should. I hope to post some footage/pictures soon but I am still drilling and filing the box it goes in at the moment. The boards/electronics are complete though.

In terms of can it be made available ... I need to do a few more test to convince myself re it's reliability but signs are good. Hope this explains.

Happy to answer questions re mode of operation etc. Feedback on best method of input would be helpful. I mainly have the filming of wide open spaces in mind for this unit. :-)

Got to go now ... I see sunshine! Will post later.

Best regards

John

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Sun Feb 17, 2013 1:40 am
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Post Re: Camera Motion Control - Multi Axis Keyframing
Hi John,

I didn't realise this was designed for stepper motors - am I right that this it means it won't work with the Merlin telescope head? If true, do you think it would be hard for me to include this capability if I got hold of the source code and did a bit of extra soldering for the extra conections required?

As for convincing yourself that it is ready to be made available it sounds like you need beta testers! I would be thrilled to be part of the development of such a system if you are interested. I can do all the soldering and construction needed so that it does not take time away from your own testing.

I've also been thinking about the best input mode, but maybe that is best discussed if I write something up with some pictures and send you a pdf?

Let me know if you are interested in a collaborator, otherwise I will just have to sit on my hands and wait for the completed system!

Cheers,
Simon


Mon Feb 18, 2013 3:28 am
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Post Re: Camera Motion Control - Multi Axis Keyframing
Hi Simon, thanks for the offer ....... much appreciated :D

It is stepper only. I don't know much about the Merlin head but I suspect hat it is DC motor based. If it is it will use timed pulses. Others might be able to confirm?

The system I am working on is 100% stepper only as it uses numeric step definition to control. I'm afraid that its really not suited to timed pulses. The reason I went down his route is repeatability. I am not sure if you can convert a DC based system ... I suspect not without a full rebuild. Sorry to not sound hopeful!

In terms of help re interface any help would be much appreciated. At the moment I intend to define keyframes by driving the head to the positions/orientations in turn and recording. Interface timings are also defined. Pauses are enabled if required. It's a sequential process.

Hope this explains. I have just finished the build and now need to test so "watch this space" for success or failure ! I am ever hopeful though :-)

In terms of collaboration it's early days ... What I do not want to do is overcommit at present ... I am cautious by nature and I want to get he thing working fully first. Hope his explains. If you want to give steppers a go though then let me know!

John

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Wed Feb 20, 2013 3:49 pm
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Post Re: Camera Motion Control - Multi Axis Keyframing
For those interested in this sort of stuff .... The latest progress. ...... It has fired up for he first time in its new box

Button input steers the axes. The BED outputs and shutter trigger are on the top. 4 axes control at the moment. Code and testing next.

Image
KEYFRAME MoCo by SiriusJohn, on Flickr

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Wed Feb 20, 2013 3:57 pm
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Post Re: Camera Motion Control - Multi Axis Keyframing
JohnB wrote:
For those interested in this sort of stuff .... The latest progress. ...... It has fired up for he first time in its new box

Button input steers the axes. The BED outputs and shutter trigger are on the top. 4 axes control at the moment. Code and testing next.


Good to see steady progress John.

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Thu Feb 21, 2013 10:55 am
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Post Re: Camera Motion Control - Multi Axis Keyframing
JohnB wrote:
Hi Simon, thanks for the offer ....... much appreciated :D

It is stepper only. I don't know much about the Merlin head but I suspect hat it is DC motor based. If it is it will use timed pulses. Others might be able to confirm?


Not exactly, the Merlin heads use DC motors with encoders, but use a serial protocol for control. You can read position, and drive to position.

Here's a C++ library for controlling them: http://openmoco.svn.sourceforge.net/vie ... unt/trunk/

!c


Fri Feb 22, 2013 8:49 am
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Post Re: Camera Motion Control - Multi Axis Keyframing
Hi John,

Sorry it's been a while since my last reply, things have been a little busy lately!

So as far as the possibility of Merlin control goes, if there is an already written library then it sounds to me like it would not be too hard to include in your controller. Of course software changes would be needed, but nothing that a hack like myself couldn't do given enough time. As for hardware, the Merlin uses a serial connection that the Raspberry Pi can certainly provide through a USB->Serial converter.

I am in the middle of writing a document that, at the moment, lists all the things I would like to see in such a controller, and suggests a suitable user interface. The way I am writing the document it should be easy to convert into a manual for the controller in its final version.

I will upload the document when I am finished.

How is progress on your side?

Cheers,
Simon


Sun Mar 10, 2013 6:09 am
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Post Re: Camera Motion Control - Multi Axis Keyframing
I found time to work on a document that has all the modes and the user interface I would create. The way I have writen it will be easy to make it into a manual for the controller when it is finished.

Document is here:
http://www.pit.physik.uni-tuebingen.de/ ... _Simon.pdf

Let me know what you think.

Simon


Mon Mar 11, 2013 6:07 am
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Post Re: Camera Motion Control - Multi Axis Keyframing
sbell wrote:
I found time to work on a document that has all the modes and the user interface I would create. The way I have writen it will be easy to make it into a manual for the controller when it is finished.

Document is here:
http://www.pit.physik.uni-tuebingen.de/ ... _Simon.pdf

Let me know what you think.

Simon

Hi Simon, many thanks! ........ The document has given me food for thought. Apologies for the late reply but I wanted to read more fully before I responded.

I like the three modes of operation and I am particularly interested in the Quick Setup and Celestial Track options.

The Keyframe functionality I think I have sorted, but at the moment time is defined between each keyframe. This gives the ability to vary speed at will over the trajectory. You do this by placing the keyframes carefully and by defining positions on the timeline (at the moment I am using time definition between keyframes. The alternative approach is to define timing for each keyframe from start point). This allows full flexibility re multi-axis speed control and enables the ability to pause during the full movement.

When keyframing I suspect that you can also define overall time via number of shots or playback time as you indicate but I had not gone down this route. I will now take a look at the maths issues. I looked at this approach a while ago and you can do it but it requires a bit of clever footwork to ensure that speed is constant over the actual x-y profile. I will take a look and see if I can sort.

The other two options (quick and celestial) should be pretty simple to programme as they are essentially linear A-B moves and arcs.

The Celestial Track mode is the most interesting one for me though.....

Now please excuse me here but I have never done any astro photography or owned a telescope. I take it that you calc rotation/celestial movement via reference to the North Star/latitude and hence derive x-y step lengths required to map an object. Now, that I would like to do :-)

Is this a function that is widely sought after?

I really appreciate you input as I say. So many thanks once again. I will try to move in the direction indicated and may even buy a merlin/celestron head to play with.

Shutterdrone, thanks for the info re encoders .... I will take a look at what is inside ... Sounds like an eBay purchase is called for:-)

At my end I have just completed converting my pan-tilt to easy drivers rather than the Phidget controllers. I am currently working on the last bits of code. Once it is working I will post a demo.

John

PS Box now has an interchangeable SD card on bottom for the different programme options/upgrades. The SD holds the OS, all of the modules required and the embedded programme. WiFi inside for external control. Connection for external HD screen.

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Tue Mar 12, 2013 8:48 am
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Post Re: Camera Motion Control - Multi Axis Keyframing
A quick video update >>>



Mike, I should have responded to your post. Apologies. I am catching up :-) Busy at work at the moment.

Thanks for the kind comment .... Progress is slow but should get there soon ;)

John

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Tue Mar 12, 2013 2:18 pm
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Post Re: Camera Motion Control - Multi Axis Keyframing
Hi ! Very interesting, it seems you've done a great job ! Congrats ^^
I was thinking of a "play test" mode : it's very difficult to see what the movement will be when you set 4 hours between two keyframes and then 2 hours between two others keyframes. So, is it possible to add a "play test" to see all the movement in 1 minute ? Like this you can record the test (at 24 frames/s) and watch it and see if the time between two keyframes seems to be good or not. Do you see want I mean ?
(Sorry if I'm not understandable or if I have a poor english, I'm a french...)

I think too that the celestial track could be very interesting ! Did you plan to combine travelling + pan & tilt ?

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Wed Mar 13, 2013 1:49 am
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Post Re: Camera Motion Control - Multi Axis Keyframing
Hi, John, I thought you had been out and about in the wilds until the video started to run ;) Looking better and better.

Just come across these drivers. May be of interest. http://www.skpang.co.uk/catalog/quadstepper-motor-driver-board-p-886.html
Also this is the cheapest place I have come across so far for BigED's

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Wed Mar 13, 2013 2:49 am
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Post Re: Camera Motion Control - Multi Axis Keyframing
Latest progress ..... debugged .... first full run with preview happened tonight .... this is it happening :D



Mike, many thanks for the link they look ideal ..... looking at the picture reminded me also that there is more than just sitting with a computer I need to go back to Yosemite :D

Hi Annamenel, Thanks for the great feedback ..... preview is possible (see above) :D The above concept applies to multi axes (xyz and rotational) and control elements (zoom focus). You just layer definition. The system takes care of the rest. All you need is more easydrivers.

Next steps ...

I now just need to add the main run into the programme and introduce lapse/trigger.

By the way the slight jitter in the video is caused by the pan-tilt being on a table along with the controller. The table was not very stable :roll:

The sample above is rough .... Please imagine increased inter-frame times to give smooth motion and it working on a multi axis basis combined say with roll/dolly/focus/zoom. The camera will move smoothly from one position/orientation to the next. Pauses are possible by adjusting inter-frame timing to zero.

Will post again once I refine the interface.

John

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Wed Mar 13, 2013 3:11 pm
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Post Re: Camera Motion Control - Multi Axis Keyframing
Hi John,

Glad you like the ideas, I agree that both the Quick Setup and Celestial Track should be easy to program. I think the Quick Setup would be really useful in the field, particularly if you are going for something that is not always around - like the Northern lights.

However, Celestial Track is certainly the more interesting option. I've never programmed this either, but I think you're right, it would be a matter of programming an arc with a specific x step y step, based on where the earth's axis of rotation is (approximately at the north star) and the current latitude.

A bit of searching in astro sites should come up with the maths. I am sure you have your hands full with the unit, so would you like me to hunt down the maths for this? I can then write it up in the manual, and then you only need to program it into the controller. Things are busy at the moment, so it will take me a while to get round to it, but it'll make me feel like part of the project!

I know you have programmed to define the playback time between each keyframe, however I would suggest that there is also an option to define a step size. In my experience with the Merlin I was never happy with an angular step size of more than 0.2 degrees, so I always set the step size o.1 degrees to be safe.

As for your comment regarding the Merlin, it sounds like your mount is already much better than a Merlin. But if you are interested in doing alterations to your controller to include the capability to control a Merlin, then I would of course be very excited :)

Simon


Thu Mar 14, 2013 1:46 am
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Post Re: Camera Motion Control - Multi Axis Keyframing
Looking good John. I'm amazed at the angular precision your rig has. It looks like the print is some distance from the camera but you are panning and tilting around within the image with extreme precision.

When you are jogging to the next keyframe position, the speed seems very good for this example which appears to involve very small movements. How long would it take if the next keyframe was 180 degrees from the previous one? It looked like it might take a while. Is there some way to allow it to move fast to get near the next keyframe position, then move slow to aim precisely? I remember the original device had the joystick, which seemed to offer the possibility of variable speed when jogging to set the next keyframe.

Congratulations on this. You've put a lot of time and effort into it. I'd be honored to try out one of the first ones that gets let loose on the world, when the time comes.


Fri Mar 15, 2013 5:13 pm
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Post Re: Camera Motion Control - Multi Axis Keyframing
sbell wrote:
Hi John,

Glad you like the ideas, I agree that both the Quick Setup and Celestial Track should be easy to program. I think the Quick Setup would be really useful in the field, particularly if you are going for something that is not always around - like the Northern lights.

However, Celestial Track is certainly the more interesting option. I've never programmed this either, but I think you're right, it would be a matter of programming an arc with a specific x step y step, based on where the earth's axis of rotation is (approximately at the north star) and the current latitude.

A bit of searching in astro sites should come up with the maths. I am sure you have your hands full with the unit, so would you like me to hunt down the maths for this? I can then write it up in the manual, and then you only need to program it into the controller. Things are busy at the moment, so it will take me a while to get round to it, but it'll make me feel like part of the project!

I know you have programmed to define the playback time between each keyframe, however I would suggest that there is also an option to define a step size. In my experience with the Merlin I was never happy with an angular step size of more than 0.2 degrees, so I always set the step size o.1 degrees to be safe.

As for your comment regarding the Merlin, it sounds like your mount is already much better than a Merlin. But if you are interested in doing alterations to your controller to include the capability to control a Merlin, then I would of course be very excited :)

Simon


Hi Simon, thanks for the offer :D . That would be good. No rush though as I have to do quite a bit of work yet to refine. :D

I will take a look at the Merlin head. If they use encoders and if they are accurate and accessible something might be done. Apologies for late and short reply but life has been a bit hectic today!

John

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Sat Mar 16, 2013 4:05 pm
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Post Re: Camera Motion Control - Multi Axis Keyframing
sciencelookers wrote:
Looking good John. I'm amazed at the angular precision your rig has. It looks like the print is some distance from the camera but you are panning and tilting around within the image with extreme precision.

When you are jogging to the next keyframe position, the speed seems very good for this example which appears to involve very small movements. How long would it take if the next keyframe was 180 degrees from the previous one? It looked like it might take a while. Is there some way to allow it to move fast to get near the next keyframe position, then move slow to aim precisely? I remember the original device had the joystick, which seemed to offer the possibility of variable speed when jogging to set the next keyframe.

Congratulations on this. You've put a lot of time and effort into it. I'd be honored to try out one of the first ones that gets let loose on the world, when the time comes.


Thanks :D

It's coming on. It's taken quite a bit of time to convert to BED's but it has been worth it. The Phidgets were great for experimentation but it was time to move on. It was no use to others based on Phidgets as you had to hard code the units. It is much more simplified now

Precision is proving to be pretty excellent. Here is an example of it really working (skip to 4.10 when you get bored of me keyframing).



This is 3030 frames. One metre away from the camera.. The pan angle is 10.36deg and tilt is 9.79deg. Average step increment is .0079deg on pan and .006deg on tilt. Smallest step is .00113 deg. Preview is speeded up normal rendered run time would be 101secs. You can see the ramping between "pauses". If "pauses" are not called up at the key frame the system moves through the keyframe and the speed is smoothed to suit the inter-frame timings. It works like a charm ..... Which has surprised me considering how confused I was about the whole thing a few weeks ago ;)

It terms of speed it is not a problem. It can be scalable and there is plenty of capacity. I did use analog input last time round and it was OK for realtime but for key framing I decided to simplify. It does work better. To move faster you simply adjust the scale of movement. The new interface also uses off-the shelf components more so others can build. My old analog unit was a bit complex. This unit is very much trimmed down and minimal. It's more tuned to distribution.

Hardware is settled. What I need to do now is refine the sofware interface a bit more. I then need to package and protect. Getting closer though. Once I am sorted I will be in touch.

Apologies for short reply ..... But it's getting late :-)

John

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Sat Mar 16, 2013 4:12 pm
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Post Re: Camera Motion Control - Multi Axis Keyframing
And JohnB's master stroke :-) , was the zoom via your controller or manual?

Best regards MikeA.

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Sun Mar 17, 2013 1:26 am
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Post Re: Camera Motion Control - Multi Axis Keyframing
MikeA wrote:
And JohnB's master stroke :-) , was the zoom via your controller or manual?

Best regards MikeA.

Thanks Mike .... much appreciated (It's a favorite picture) :-) Manual at the moment I'm afraid. I am just building a drive to attach to one of my lenses to allow me to control zoom across the key frames. It will sychronous ramp in a similar manner to the the x-y axes. This is how I layer. Will post again soon and show it working........

This is a never ending project ....... just what I like :)

thanks again for the quadstepper link .... have a good evening

John

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Sun Mar 17, 2013 9:46 am
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Post Re: Camera Motion Control - Multi Axis Keyframing
John

A bit off topic, but can you tell me where you got the case from?

Thanks

Martin

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Sun Mar 17, 2013 2:43 pm
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Post Re: Camera Motion Control - Multi Axis Keyframing
mshakeshaft wrote:
John

A bit off topic, but can you tell me where you got the case from?

Thanks

Martin

Hi Martin, Maplin ..... one of my favourite shops :-)

Here is a link >> http://www.maplin.co.uk/aluminium-instr ... ures-33690

The nice thing about these enclosures is that the base plate slides out. They are also very strong and structurally stable.

Best regards

John

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Mon Mar 18, 2013 12:41 am
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Post Re: Camera Motion Control - Multi Axis Keyframing
Just stumbled across this thread and I have to say you are doing great things. Are the drivers in the enclosure? If so could you fit 6 in there?

I'm currently using Dragonframe but love the idea of using this out in the field.

Two things I would like to see in the final product:

-The ability to be externally triggered. I'm looking for a solution to do complex moves while bulb ramping. I currently can do both individually but Dragonframe is not easily triggered by an external intervalometer.

-USB output that interfaces with the Emotimo TB3.


Mon Mar 18, 2013 1:01 pm
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Post Re: Camera Motion Control - Multi Axis Keyframing
Zigmo wrote:
Just stumbled across this thread and I have to say you are doing great things. Are the drivers in the enclosure? If so could you fit 6 in there?

I'm currently using Dragonframe but love the idea of using this out in the field.

Two things I would like to see in the final product:

-The ability to be externally triggered. I'm looking for a solution to do complex moves while bulb ramping. I currently can do both individually but Dragonframe is not easily triggered by an external intervalometer.

-USB output that interfaces with the Emotimo TB3.

Hi Zigmo, Many thanks.
The drivers are external at the moment but I intend to close couple within one enclosure in the next prototype. It will be a single enclosure with human interface that holds the processor and the BED's that allows direct 4wire connections to the stepper motors.The processors arrive tomorrow build starts hopefully next week. At the moment I have four elements of control enabled but can go up to eight. The current enclosure can take four..... I need to consider heat dissipation though before the design settles. Six should be possible .... It's just a matter of space and cooling.

I want to thank you ..... I had not considered external triggering...... That is one good idea!

I was working it the other way round. My programme triggers the camera. It should not be a problem to enable external trigger. I will look into it.. Thanks!

Re interfacing as I say it drives the steppers direct. Everything is in the box. No need for intermediate processing.

Hope this explains ... Ask any questions you want. I don't mind talking about it!

John

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Mon Mar 18, 2013 2:55 pm
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Post Re: Camera Motion Control - Multi Axis Keyframing
Come on John, you're brainy enough to add an intervalometer. Nothing to it ;)

Zigmo,
I'm currently doing some work on externaly triggering Dragonframe. See my thread on using non-canon cameras on their forum.
First thoughts are that, if you want to use your existing intervalometer, you could intercept it's output with an Arduino and connect into DF using the simple serial interface, example sketches for which are included in the DF download.

Kit

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Mon Mar 18, 2013 5:48 pm
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Post Re: Camera Motion Control - Multi Axis Keyframing
:D Hi Kit, The answer is ............ "Mercury astronauts! " I got bogged down at the time with work and did not have chance to reply (Thunderbirds)

Trust you are well

Currently triggering direct based on inter frame delay but need to move to reference to internal clock as discussed. It took me ages to re-write my code for easydrivers so I am behind schedule.

External trigger I suspect will also be useful. Not a big job :D

John

PS. actually Key framing inter-frame (lapse) interval and shutter via bulb mode is what really appeals (smooth transitions) ;)

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Tue Mar 19, 2013 4:46 am
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Post Re: Camera Motion Control - Multi Axis Keyframing
Kitwn wrote:
Come on John, you're brainy enough to add an intervalometer. Nothing to it ;)


Adding an intervalometer is one thing but properly implementing a bulb ramping intervalometer is another. Although I would love to see a single device that could handle it all I don't know how it could be made easy to use. There are a few new bulb ramping project that look promising.
Kitwn wrote:
Zigmo,
I'm currently doing some work on externaly triggering Dragonframe. See my thread on using non-canon cameras on their forum.
First thoughts are that, if you want to use your existing intervalometer, you could intercept it's output with an Arduino and connect into DF using the simple serial interface, example sketches for which are included in the DF download.
Kit

Found it: http://www.dragonframe.com/forum/viewto ... ?f=2&t=832
Gave it a quick read. I'm currently using the their DFmoco sketch to control 8 axis. It's been a year but I did look at the other sketch in hopes to see an easy way to make dragonframe move to the next position. I didn't fully understand you complete process you're using regarding the folder watch. Ill do some more reading. I simply want dragon frame for the Moco control. All I need is for dragonframe to move to the next position once told to do so.


Tue Mar 19, 2013 6:19 am
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Post Re: Camera Motion Control - Multi Axis Keyframing
Ah, ..... I should clarify....... As I have mentioned bulb ramping ...
I do not intend to implement full dynamic bulb ramping. Others can do this much better than I can. True bulb ramping (from what I understand) is a dynamic and interactive process. It is not particularly "predictive". It is probably best handled on a separate dedicated unit which simply triggers the move. I am though very interested in seeing what happens if the exposure is flexed via bulb timing changes when you use keyframes to define the bulb profile. My thinking is that for a given aperture you could define transitions by sampling shutter timings at keyframes. (no shutter feedback)

Thoughts/views on this would be appreciated.

Hope this explains/clarifies

John

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Tue Mar 19, 2013 6:53 am
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Post Re: Camera Motion Control - Multi Axis Keyframing
This. Is. amazing.


Tue Mar 26, 2013 11:48 am
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Post Re: Camera Motion Control - Multi Axis Keyframing
This link may interest you John, cheapest BigED's I have found in UK.
http://www.skpang.co.uk/catalog/robotics-mechanical-motor-control-modules-c-159_161.html

+ this 1/32 step driver: http://www.skpang.co.uk/catalog/drv8825-stepper-motor-driver-carrier-high-current-p-1146.html
The above arrived today hope to try them in the next day or so.

Regards MikeA.

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Wed Mar 27, 2013 11:35 am
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