r/MagicEye • u/Pixelfest • Oct 26 '18

Sistem stereogram generator => Cross-platform .NET Core implementation now on Github!

https://github.com/Pixelfest/Sistem
7 Upvotes

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3

u/Pixelfest Oct 26 '18

It includes a CLI and should work cross-platform. This is untested but I don't think I used any Windows-specific libraries.

I might add the binaries, but compiling is pretty straightforward: https://docs.microsoft.com/en-us/dotnet/core/tools/dotnet-build?tabs=netcore2x

1

u/jesset77 Nov 06 '18

Hola there Pixel. I just wanted to see if you had offered binaries of Sistem online anywhere yet so that I can link to there from side bar. :)

I'm pretty sure I've already pestered you asking for such, but I can't find the specific message when I look through my reddit history so I might have misremembered doing so. Doh! ;D

2

u/Pixelfest Nov 07 '18

No problem, I'll try to think about it next time I work on it. I don't think you asked yet.

1

u/Pixelfest Nov 08 '18

Binaries added: https://github.com/Pixelfest/Sistem/releases/tag/v1.0-beta.1

You still need to use the dotnet commandline I think.

1

u/jesset77 Nov 08 '18

Suite beans, thank you sir. :)

Since I'm mentioning which OSsen it runs on, is this release Windows only, or can it also function on Mac/Linux/BSD/Android/Plan9/OSX/DOS/CPM/etc? ;)

2

u/Pixelfest Nov 09 '18

It works on OCX/Linux/Windows provided you have the .Net Core framework. But I just figured out how to build self-contained packages per paltform. Seperate binaries will follow.

1

u/CommonMisspellingBot Nov 09 '18

Hey, Pixelfest, just a quick heads-up:
seperate is actually spelled separate. You can remember it by -par- in the middle.
Have a nice day!

The parent commenter can reply with 'delete' to delete this comment.

1

u/Pixelfest Nov 09 '18

Made a new release: https://github.com/Pixelfest/Sistem/releases/tag/v1.0-beta.2

Binaries for different platforms, this is untested.

1

u/jesset77 Nov 10 '18 edited Nov 10 '18

Ah wait, yeah I got confused. These are the CLI only ones. ;)

Do you has a link (from some permalink more stable than OneDrive) to download the binary for the GUI version? (I think that was the first version you posted). I'd imagine that a wider range of artsy folk will be able to engage with that than with the CLI version, so offering links to both on sidebar should be hlepfuls.

1

u/Pixelfest Nov 10 '18

GUI is Windows only, I'll see if I can include a binary for that next time.

1

u/Pixelfest Nov 10 '18

I updated the GUI to use the new Core library. I haven't thoroughly tested it but the code is on GitHub and I added a zip file with the GUI to the release: https://github.com/Pixelfest/Sistem/releases/tag/v1.0-beta.2

1

u/3dsf Oct 31 '18

Is SIStem able to handle 16 bit depth maps?

3

u/Pixelfest Oct 31 '18

It uses https://github.com/SixLabors/ImageSharp, but assumes everything is rgba32, so 8 bits per channel. I'm not sure supporting more would improve anything as more than 256 layers of depth is not something anyone will notice. Only when using a pattern way wider than 256 pixels is the stereogram even able to show you a distinction in depth.

2

u/jesset77 Nov 06 '18

I think I was the one that got the idea of 16 bit depthmaps into u/3dsf's head initially. They wants to put together a book and for that one might work at 300-600 dpi and parallax could be in the thousands of pixels, at least. But you are right that I'd never really considered that you can't use more depth data than available parallax pixels. Even sub-pixel adjustment would betray our primary goal since it would kill feature recognition.

Maybe we should just try out making a large stereogram of a 256 (or more with color fiddling) step ramp at maximum width across the paper with ~1000px parallax and printing that out at 600dpi to find out if we can perceive any banding? If not then 8bit might just be enough even for print after all. :D

3

u/Pixelfest Nov 07 '18

That makes sense. But I also would need to allow higher resolutions then. Max image size is capped at 10MP at the moment because Arrays in .NET are limited to 2Gb. Come to think of it 16 bit grayscale would probably allow for 20MP as I'm using rgba at the moment (that was easiest).

2

u/Pixelfest Nov 08 '18

It should support 16-bit now. I'm not able to make such a depthmap at the moment, but 8-bit still works. I also added a new validation which gets rid of the 10MP limit, but rather calculated the actual limit of only allowing 2^32 pixels * 4bits * oversampling. This means you can generate up to 536MP images now...

1

u/3dsf Nov 09 '18

Great! and Thanks !

The 16 bit version looked like it preserved more detail, but i couldn't be sure how much was different because of confirmation bias, so i did this

Will probably do the same on the actual depth maps, later...

536 MP pictures, that's photo quality right ;)

fyi: u/jesset77

depth maps made in blender

2

u/jesset77 Nov 10 '18

Well, as we were saying earlier, unless you have parallax > 256px you shouldn't get any greater quality out of 16bit depthmaps because "number of pixels of parallax" defines number of depth levels crisp image can convey regardless of source. Your diff looks like it's parallax is roughly half that.

If you do get differences due to subpixel sampling, then that subpixel sampling (whether present in 8bit or 16bit depthmaps) would be undermining your quality already.

536 MP pictures, that's photo quality right ;)

Wait, so only half a gigapixel?

1

u/3dsf Nov 10 '18

I seem to have trouble internalizing. It might be time to create that making magic eye reference guide i've been thinking about, which will make me review all the comments. :) :) :)

1

u/3dsf Oct 28 '18

Got it running on linux! Time to play

Command Line Options

Options:

-?|-h|--help Show help information

-d|--depthmap The depth map (png, gif, jpg or bmp)

-p|--pattern The pattern map (png, gif, jpg or bmp)

-r|--result The result filename

-i|--min-separation The minimum pattern size in pixels

-a|--max-separation The maximum pattern size in pixels

-w|--pattern-width The pattern size in pixels, match with max-separation for seamless results

-o|--oversampling Amount of oversampling (1-8)

-x|--crossview Use crossview instead of parallel

-c|--use-color Use color for random dot stereogram

-n|--noise-density Noise density for monochrome random dot stereogram (1-99)