...
Place a piece of paper under the print head at the approximate height of objects you will spray
Select “Test Shot” to fire all valves onto the paper. You may need to adjust valve open time and/or add dye to the liquid to more easily see the spray pattern. Ideally you want to see 32 individual spray marks (may be less well defined if the paper is a lot lower than the print head).
Move the vehicle forward in a straight line until the spray pattern is in the vertical centre of the camera frame. You must drive straight for this to be accurate.
Adjust the “Spray centre offset” and “Row Width” sliders until each spray mark is in its own column. Most importantly look at the first and last columns, the other may not line up as well.
Record the values of “Spray centre offset” and “Row Width” and update these in the code. Variables “SliderCentreDefault” and “SliderWidthDefault” respectively.
...
Pixel Size
The physical length of the vertical pixels must be recorded for a given camera and object height. This allows the system to know the physical position of an object in the frame.
...