Alignment of the 8MP camera from Lightburn

[Udo (Udo Scheibner)]

I have a problem with the alignment of the 8MP camera from Lightburn.
After I finally managed to calibrate the lens, the camera has to be aligned.
But unfortunately the test image is drawn so large in the Y-axis that I can’t laser it,
because it is drawn up to the 600mm travel distance.

I have read here that the controller must be set to Soft Origin.

8mp camera alignment issues

is it going to be camera lens or alignment? I get 0.1 or so on alignment and everything looks good until i hit finish. I have done both a half dozen times each with same results?

Unfortunately, I cannot find this setting in the RDC6445S, I can only switch to multiple origin.

I don’t know how to get the test image smaller so that the laser also starts?

I have already set the starting point to the center and tried everything.
I am at a loss.

Best Udo

[misken (Melvin)]

Here you can change the size:

LightBurn usually selects a size fitting to the workspace, but you can change anyhow. Though, I don’t own a Ruida controller and don’t know if there are any differences.

[Udo (Udo Scheibner)]

Oh my god am I blind.
I didn’t see that, it says 273.
Thank you very much.

[Udo (Udo Scheibner)]

Hi,
I’m still at war with the alignment.
My problem is that I have always had the lens optics below 0.25.
The 0.25 is actually in the 4 corners, top bottom and sides center, I was even at 0.1 to 0.12.
After I went through the Camera Aligment Wizzard, my outer corners unfortunately don’t fit.

The original registration marks, if I capture them via the camera, put a cross over them and then glue them over, fit quite well, let’s say I could live with it.
But in the outer corners, on the other hand, it doesn’t fit at all.
Unfortunately, I can only enlarge the sample image to the almost maximum height of my table, I can’t go any further out.

What can I do to improve the accuracy in the corners, unfortunately I can’t think of anything else.
I have now run through the whole thing 6 times, including the lens optimization, until I have obtained top values.

I bought the original 8MP from Lightburn and attached it to the lid, I didn’t even close the lid, so there is no change in the camera position in relation to the table.

I also find that despite the 8MP, the image is not really blurry and easy to recognize when capturing.
Here, too, I tried to optimize everything possible before I went through the wizard.
I just couldn’t get any more image quality out of it.

Is that perhaps the reason?

I hope someone else has an idea what I can do.
Incidentally, the laser has an area of 900x600mm.

Here are a few more pictures of my results

Screenshots from Lightburn for setting the crosses.
Here you can already see that it is quite blurred, but that’s all you can adjust.

Here are pictures of the original marks from the Wizard.
I can live with that.

but now the outside corners

and an overview of the whole table with my sample board, which I also glued onto a plastic board.

I took the overview with the smartphone, not with the 8MP from the lid.

Best Udo

[berainlb (PY)]

I’d suggest rerunning lens calibration.

Before you do so, paste down the calibration pattern onto a known flat surface such that it’s laying perfectly flat. Any distortion resulting from a non-flat surface will be transferred onto the overlay.

[Udo (Udo Scheibner)]

Hi,

Okay, I’ll do it again.

The last time I did it, I had great values, even 0.08 in one place, the worst values are in the 4 corners, where the values are max. 0.25, I can’t do any better.

At least I don’t know how to improve it, unless I use a different camera.
I’ve already looked on Amazon, for example, there are 16MP cameras that have a distortion-free lens with an angle of 120 degrees.

I had written under the picture where you can see the pattern that I would put it on a
plastic plate.

“and an overview of the whole table with my sample board, which I also glued onto a plastic board.”

Best Udo

[berainlb (PY)]

After rerunning lens calibration and camera alignment, create a design in LightBurn of a grid of markers that cover the entire work area.

Burn that to a material, then capture the overlay. Use the width, height, and X/Y shift controls to fine-tune the alignment. Then save.