Camera For Touchoff

phillc54 wrote: Camera only.
Rotation is manual with a mouse, right button + scroll.

Another method is to find an edge down the back of the sheet, press a button, and then go to the origin corner and click touchoff and calculate the angle using some trig and adjust for the offset. That is much more accurate when a full sheet (say 2400mm x 1200mm or 3000mm x 1500mm) is used. I have done some work on that with my laser pointer extending some work by BigJohnT.

But with the camera, you should be able to implement edge detection and corner detection using opencv features. Imagine that! Just click one button "Align sheet" and let the machine do it all automagically. Let the camera wander around looking for edges then finally move to the origin corner.

phillc54 wrote: Good question, I used it with a cheap'n'nasty "endoscope" usb camera I had lying around, similar to this

It also worked on a virtual machine with the inbuilt camera on my Mac.

Ah, good call. I guess a mechanical shutter to protect it from splashes would be nice, unless it has a decent focusing distance/long focal length.

rodw wrote:

phillc54 wrote: Camera only.
Rotation is manual with a mouse, right button + scroll.

Another method is to find an edge down the back of the sheet, press a button, and then go to the origin corner and click touchoff and calculate the angle using some trig and adjust for the offset. That is much more accurate when a full sheet (say 2400mm x 1200mm or 3000mm x 1500mm) is used. I have done some work on that with my laser pointer extending some work by BigJohnT.

Yeah, that would be easy to implement.

But with the camera, you should be able to implement edge detection and corner detection using opencv features. Imagine that! Just click one button "Align sheet" and let the machine do it all automagically. Let the camera wander around looking for edges then finally move to the origin corner.

There's project for you, Qtvcp uses opencv so it's half done.

phillc54 wrote: There's project for you, Qtvcp uses opencv so it's half done.

It will be years before I have the time to play with stuff like that plus I much prefer directing software projects than coding them.

The story of my [strike]life[/strike] business right now. I don't know why I started ramping up a hobby business into a serious brand when I turned 60!

Rodw
It's fun.

Tried when was 40'ish. No successful
But i did it!
Happy about.
Mike

Mike_Eitel wrote: Rodw
It's fun.

Tried when was 40'ish. No successful
But i did it!
Happy about.
Mike

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