Spiroglyphic digital image processing

Hi,

Hoping somone can help. I've emailed Matlab themselves and they suggested that I post here to see if anyone else has done something similar.

I'm looking at buying the Matlab home licence and the image processing add on to produce images like this

The person who posted this on https://imgur.com/gallery/fiP9sVG says they used Matlab to produce the image. I've tried to contact the person concerned to see if they would share code and/or expand on which add ons they might have used but I've not had a reply.

Anybody got any experience with producing such images. I think they're called spiroglyphs.

Many thanks,

Gav

[Image Analyst]

Here is a start: FAQ: How do I create a spiral?

By the way, what is the use case? Just a novelty/curiosity or for fun? Or some other use?

[gav]

Thank you. Just curiosity really. I was taken by how similar the image was to one produced by some talented engravers from the 1600s.

http://www.photoconservation.com/index.php?option=com_content&view=article&id=99:single-line-engraving&catid=35:printprocesses&Itemid=63

[Dayna]

Hi Gavin,

Were you able to write a code to perform this function--if so, would you be willing to share?

Thanks in advance! Regards,

Dayna

Answer 1

[John D'Errico]

To be honest, I don't see the problem.

1. Start with a black and white image.
2. Create a new image of the same size that is all black.
3. Start in the middle of your image, working out in a spiral. Surely that part is easy. The equation of a spiral in polar form is just r = k*theta. The tangent line to such a spiral is almost as easy to compute.
4. At any point on the spiral, determine the local brightness of your image. You can get that from a call to conv2, using it to integrate the image in a local window. A circular convolution kernel might seem reasonable. You can pick the radius of the circular region. It would likely be a function of the value of k used to generate the spiral.
5. Insert into the spirogram image at any point on the spiral a white line of width proportional to the local brightness at that point. Make the inserted line segment be parallel to the spiral at that point.

You should get the gist of it. As I said, easy, peasy. While the devil is sometimes in the details, this is not at all difficult, and it will not even require the image processing toolbox.

[gav]

John,

Many thanks for taking the time to answer. Not sure that it will be "easy peasy" for someone of my skill level but plenty there to work with and interesting that I shouldn't need the image processing toolbox.

Much appreciatted,

Gavin

[John D'Errico]

Sometimes the devil is in the details. :)

[liat liat]

can you record a video i dont understnad

Answer 2

[Aek mEto ERI]

please, i'm interested too...can you kindly post some screenshot with info? step by step..

Or share a video with step by step! it will be great !

thank you

[liat liat]

i need help too