Approve the Cookies
This website uses cookies to improve your user experience. By using this site, you agree to our use of cookies and our Privacy Policy.
OK
Index  •   • New posts  •   • RTAT  •   • 'Best of'  •   • Gallery  •   • Gear  •   • Reviews
Guest
New posts  •   • RTAT  •   • 'Best of'  •   • Gallery  •   • Gear  •   • Reviews
Register to forums    Log in

 
FORUMS Photography Talk by Genre General Photography Talk 
Thread started 30 Nov 2012 (Friday) 18:40
Search threadPrev/next
sponsored links
(this ad will go away when you log in as a registered member)

Use your camera to create slit camera (slit-scan or timeline) images.

 
zackdezon
Hatchling
1 post
Joined Aug 2017
     
Aug 30, 2017 07:48 |  #151

Hi, Martin! Thanks so much for creating this wonderful program. I've already used it to create a series of 'portraits' I'm very happy with:

http://www.zackdezon.c​om/pareidolia/ (external link)

I have a similar question to chelioz from earlier, as I've been wrestling with the question of 'why is it that analog slitscan processes are so much easier to get high-speed results with than digital?' Since film doesn't have a 'framerate' to deal with, just the speed at which you pull the film across the sensor, that's obviously a big reason. But I also realized that analog slit-scan cameras don't have to deal with the problems caused by 'slit perfection,' as your 1-pixel-at-a-time algorithm creates. Analog slits are never going to be small enough to hit only one grain of emulsion per unit motion.

So, my question would be, as a non-programmer—is there a way to 'widen' our digital slit at all? In my imagination, it would involve first pulling more than 1 pixel per frame (as many as 10-30 I imagine would still represent a pretty narrow slit given a 4K vertical dimension) and then overlaying some percentage of those pixels (perhaps with an 'addition' blending mode—this would require underexposing the original video to wind up with a correct exposure) frame by frame.

Would love to hear your thoughts.




  
  LOG IN TO REPLY
sponsored links
(this ad will go away when you log in as a registered member)
Martin ­ Dixon
THREAD ­ STARTER
Slit-scan project master
Avatar
1,864 posts
Gallery: 59 photos
Likes: 274
Joined Sep 2009
Location: Ealing
     
Aug 31, 2017 11:28 as a reply to  @ zackdezon's post |  #152

My program can't get finer resolution than the framerate. You can use photoeditor to expand an image in the time dimension, though you obviously lose resolution.

I did think some kind of averaging would improve image quality - in fact I coded this in the original , but it made no noticable difference - see post:

Martin Dixon wrote in post #18012955 (external link)
clelioz, I can't see how you can get over the framerate limitation. For your purpose I think you would need a camera with fast framerate option......

You could replicate an analogue camera using a scanner type sensor (linear image sensor) which is just one line of pixels and can be read at far higher framerates than full image sensors. My guess is that after some research this wouldn't be very hard to do or that expensive if you have some techy interest. Presumably then you can conentrate more light using a prism lens if needed (that being the"widening" you speak of.

I have some idea that "Magic Lantern" alternative software for Canon cameras might possibly find faster framrates using unusual frame sizes but I havem't looked at that for a while.

I did think of some crazy ideas using mirrors and multipe "slits" so you could pick up fractions of a frame as it information is read raster fashion, line by line - but I think this is likely the hard way to do it.

Let me know if you take up the challenge!


flickr (external link) Editing OK (external link) www.slitcam.com (free slit-scan utility) (external link)

  
  LOG IN TO REPLY
Daniel ­ Wallraven ­ Marsden
Hatchling
Avatar
4 posts
Likes: 2
Joined Jan 2016
     
Sep 30, 2018 08:28 |  #153

I use your program in my GCSE photography a couple of years ago and got an A, the examiner loved the stuff I made and apparently wanted to give me an A* but the marking scheme didn't really work for weird stuff like slit scan. Anyway lots of thanks and if I can get access to my GCSE stuff again I'll post it here.

I've been using the program again recently and made these using videos of Geysers in Iceland, I never intended to put them through the program but came out pretty great anyway.


HOSTED PHOTO
please log in to view hosted photos in full size.



HOSTED PHOTO
please log in to view hosted photos in full size.




  
  LOG IN TO REPLY
nsitu
Hatchling
1 post
Joined Apr 2019
     
Apr 20, 2019 14:28 |  #154

I'm happy to stumble upon these Slit Scan methods using Processing. My own experiments have led me to use a mix of different tools.

I have been creating spirals using the panoramic images that result from slit scanning.


IMAGE: https://www.nsitu.ca/wp-content/uploads/2018/08/rushhour-1024x1024.jpg

My approach has been to extract pixel rows from digital video. https://github.com/nsi​tu/traverse (external link)
I also use photoshop scripting to spiralize. https://github.com …piralize-Photoshop-Script (external link)

I wonder if you have ever come across a digital video camera that is optimized for slit scanning? My sony A7 gives me the standard ~2megapixel 1920x1080 format; It seems like there ought to be a camera on the market that rearranges the sensor into slit form. On the extreme end, I imagine those 2 megapixels rearranged in ultrawide format, but It's not clear that you can actually record video in a 2,000,000 x 1 aspect. Maybe there is some place in the middle that works. e.g. 20,000 x 100 pixels would be pretty nice. I would be eager to know if you have any pointers here around possible solutions.

There is also the question of frame rates. I have been using frame interpolation using AVI Synth to increase the framerate on video, in order to generate smoother slit scan results. But if this could happen at the hardware level all of this could be much smoother and faster. Let me know if you have any thoughts.

https://www.nsitu.ca/t​raversals/ (external link)



  
  LOG IN TO REPLY
Daniel ­ Wallraven ­ Marsden
Hatchling
Avatar
4 posts
Likes: 2
Joined Jan 2016
Post edited over 1 year ago by Daniel Wallraven Marsden. (2 edits in all)
     
Apr 21, 2019 04:14 as a reply to  @ nsitu's post |  #155

I’ve not been able to find any slit scan specialised digital camera on the market, however I have seen some film based ones on ebay that roll the film in front of the strip. Unfortunately though, they are quite old and extremely expensive as they are rare collectors items now and probably more hassle than it’s worth.
I think the main issue with a camera with a single long strip of a couple million pixels would be that it would require a very specialist lens to be used effectively. It would either need an enormous traditional lens that would need to span the whole strip, or some sort of long semi-elliptical based cylindrical lens that would be hard to make and might not even work properly. I like the idea though and the pixels side of it could definitely work.




  
  LOG IN TO REPLY
Blitzschnitzel
Hatchling
7 posts
Likes: 1
Joined May 2016
     
Apr 22, 2019 08:08 |  #156

It’s called a line scan camera. They are used for quality control on conveyor belts. Like with all industrial equipment you have to ask the manufacturer about the price and if you have to ask you can’t afford it. Since the data output is very small you can get extremely high framerates.




  
  LOG IN TO REPLY
KellyLaundromat
Hatchling
1 post
Joined Feb 2020
     
Feb 21, 2020 03:01 |  #157

Hello Martin - thank you very much for making your work available to everyone. I have started experimenting with the tool as it greatly simplifies the process for creating digital slit scan still images.

Is there a way to change the slit sample width in the script? 'Out of the box' it only seems to sample 1 pixel wide. I would like to experiment with wider slit blocks.




  
  LOG IN TO REPLY
Arti
Hatchling
1 post
Joined Feb 2020
     
Feb 24, 2020 04:08 as a reply to  @ post 15315076 |  #158

Excellent program mate, thanks a lot.
I just have a problem after running the video mofule I get the error below in the screenshot?
Any idea how may I fix it.Thank you


HOSTED PHOTO
please log in to view hosted photos in full size.




  
  LOG IN TO REPLY
Bluewave42
Junior Member
Avatar
21 posts
Joined Jan 2014
Location: Western Isles, Scotland
     
Mar 24, 2020 03:47 as a reply to  @ Arti's post |  #159

Presuming you have the standard video library installed, are you trying to use a video format that isn't .mov?


flickr (external link) ~ Instagram (external link) ~ Twitter (external link)

  
  LOG IN TO REPLY
sponsored links
(this ad will go away when you log in as a registered member)

55,313 views & 13 likes for this thread
Use your camera to create slit camera (slit-scan or timeline) images.
FORUMS Photography Talk by Genre General Photography Talk 
AAA
x 1600
y 1600

Jump to forum...   •  Rules   •  Index   •  New posts   •  RTAT   •  'Best of'   •  Gallery   •  Gear   •  Reviews   •  Member list   •  Polls   •  Image rules   •  Search   •  Password reset

Not a member yet?
Register to forums
Registered members may log in to forums and access all the features: full search, image upload, follow forums, own gear list and ratings, likes, more forums, private messaging, thread follow, notifications, own gallery, all settings, view hosted photos, own reviews, see more and do more... and all is free. Don't be a stranger - register now and start posting!


COOKIES DISCLAIMER: This website uses cookies to improve your user experience. By using this site, you agree to our use of cookies and to our privacy policy.
Privacy policy and cookie usage info.


POWERED BY AMASS forum software 2.1forum software
version 2.1 /
code and design
by Pekka Saarinen ©
for photography-on-the.net

Latest registered member is lo1n1234
690 guests, 160 members online
Simultaneous users record so far is 15144, that happened on Nov 22, 2018

Photography-on-the.net Digital Photography Forums is the website for photographers and all who love great photos, camera and post processing techniques, gear talk, discussion and sharing. Professionals, hobbyists, newbies and those who don't even own a camera -- all are welcome regardless of skill, favourite brand, gear, gender or age. Registering and usage is free.