Creating a Dot Target Calibration with Fixed-Pixels Fixed-pixel calibration allows you to specify what physical distance is represented by each camera pixel. All camera pixels will be given the same dimension, which is not necessarily the case with a grid of dots. This method of camera calibration will not correct for lens distortion or perspective. Related Topics Vision Devices Overview Adding a Physical Camera Adding Vision Tools Calibration Overview Creating a Dot Target The quality and precision of a grid of dots target have a direct impact on the overall precision of your applic- ation.
Dot targets are commercially available, but you can also create your own targets by following the guidelines provided below. l A dot target is made up of a matrix of evenly-spaced, identical calibration dots. l A secondary matrix of validation dots can be added, offset to the matrix of calibration dots, to val- idate the calibration process. Although they are not absolutely required, these dots are useful for error calculations. l Dots in both matrices should be identical in size and have the same dot pitch (the distance between the centers of two dots in the same matrix). Dot pitch must be the same in both X and Y directions.
l The offset between the calibration dot matrix and the validation dot matrix must be 1/2 dot pitch in the X and Y axes. ACEUser's Guide, 3.6.x, 18316-000 Rev A Page 326