The camera caliberation papers are either A4 or A3, does this mean that the camera view must be this size as well. Or can we zoom to the borders of the caliberation papers during this caliberation. I would like to know this so I can select a suitable lens for my PickMaster line. So far I would like to have the following camera setup:
Distance from object : 1m
Object Area: 300 x 300 mm
My calculations result in a 25mm, 2/3" lens and I am using the Basler Scout CCD Camera (scA1390) with 1/2" sensor. Please assist on whether it is suitable for the application, before I make any purchases of the lens.
The camera image can be any size. It does not have to be A3 or A4. You can print the calibration sheet in any suitable size, but keep in mind that it should cover the whole area of the image that you intend to use in your application plus some margin. When you perform the calibration you enter the actual value of the checkers (grid pitch) in millimetres.
Your data:
Distance from object : 1m
Object Area: 300 x 300 mm
Sensor: 1/2"
25mm seems incorrect. This will give a field of view that is too narrow.
A 16mm lens gives 300x400mm. However, during the calibration a portion of the edges of the image will also be cropped. This means that you should always allow for some extra margin. You can do this in two ways:
Mount the camera farther from the object to get a greater field of view.
Choose a lens with shorter focal length, e.g. 12 mm. This will decrease the effective resolution, but maybe you don’t need it?