Laser camera alignment for diode and CO2 lasers

A camera mounted above the bed photographs the workpiece, and the software lays that image under your design, so you drag the design to exactly where it belongs. For that to be accurate, two calibrations are needed. The lens calibration removes the barrel distortion of wide-angle cameras. The alignment then maps each pixel of the camera image to a position on the machine. After that, what you see on screen matches where the laser will fire, on diode and CO2 lasers alike.

• Camera photographs the real workpiece
• Lens calibration removes distortion
• Alignment maps the image to machine positions

Most laser cameras use a wide-angle lens so they can see the whole bed, and wide-angle lenses bend straight lines near the edges. The lens calibration measures that bend with a printed calibration board photographed in several positions. In Vextrify you capture the board at up to nine positions — moving the laser head out of view with the jog pad — and the wizard shows the reprojection error, so you can see how well the lens model fits. The result belongs to the camera and survives a reinstall of the app.

• Printed calibration board at several positions
• Reprojection error shown after calculating
• Survives a reinstall; redo only for a new camera

The alignment ties the camera image to the machine. Vextrify engraves a pattern of reference marks at low power, takes a still image, and you click the nine marks in the photo. From those points it solves the perspective transform and reports the remaining error in millimetres. If the camera moves later, only this step is repeated — the lens calibration stays valid. Each camera is bound to its laser, so a shop with more than one machine keeps a separate alignment per laser.

• Low-power reference marks, then nine clicks
• Remaining error shown in millimetres
• Camera moved? Repeat only the alignment

Once calibrated, the live camera image sits under the work area in perspective, and you can dim it, zoom it, or freeze a still. Place the design on the workpiece, run a frame to trace the outline, then a dry run if you want, and start the job. The camera is a desktop feature: it needs the machine and the USB camera on the same computer, so the browser version prepares files but does not show the camera.

• Live overlay, dimmable, zoom and still image
• Place, frame, dry run, engrave
• Desktop app only — the browser prepares files

Camera placement is not unique to one program: LightBurn supports cameras with lens calibration and alignment, and the open-source Rayforge offers camera alignment too. What Vextrify adds is that the camera lives in the same app that prepares the photo and drives the machine, with calibration and alignment stored per laser. RDWorks and LaserGRBL do not offer camera alignment. Whatever you use, the rule is the same: calibrate the lens once, repeat the alignment whenever the camera moves.

• LightBurn and Rayforge: camera support too
• Vextrify: camera, prep and control in one app, per laser
• RDWorks and LaserGRBL: no camera alignment