Reading Barcode data

Hello everyone
I have an idea to use Linuxcnc to process the outer edges of the board with the X and Y position, but I want to read the barcode that contains the X and Y values ​​and automatically start the processing, does anyone have an idea how to do it

Probably using OpenCV (not related to LinuxCNC, github project, open source), as there are already some examples of using it with LinuxCNC, see QtPlasmaC and how it uses it to skew the whole gcode to material.

Yes, you would need to digitize the barcode and opencv sounds as good as any. It may have a barcode parser.
To do it yourself you would first need to determine the barcode symbology
There is a phone app called Barcode Data Decoder which will do this.
assuming a 2D symbology, barcodes usually have a start and a stop sequence. Barcode characters are made up of bars and spaces. These are defined as being multiples of the narrow bar width. If you are generating barcodes on a Zebra ZPL printer like I do, the narrow bar is defined as being 1,2 or 3 pixels wide (@203 dpi). Wider barcodes are easier to read. 1 pixel wide narrow bar is nearly impossible to read.

So then you can study up on your symbology and understand its structure.
If you are choosing the symbology, CODE39 is probably the easiest to parse at a low level but its not very compact. Code 128 is more compact but  harder to parse. ref:  en.wikipedia.org/wiki/Code_39

An alternative could be to use a barcode scanner. These will plug into your computer as a HID keyboard device. There are some small barcode modules that are RS232 devices.  www.aliexpress.com/item/1005007002453623...OfpGuWBoClGYQAvD_BwE

Forgot OpenCV, and use a barcode scanner.
I do this way to scan the worksheet and load the G-Code according to the type of part which I need to machine. The bar code scanner act as a keyboard, and I use a few python in the handler.py file to get what I need.

Hastrh2o Can you share and example? Thanks a lot.