The Calibration-Map consists of black points, which are ordered in lines and columns on a white background. When this pattern is photographed with a camera, ImageIron can draw exact conclusions on the lens distortion based on the digital pictures - as long as the used Calibration-Map itself depicts the points without distortion of course.
Calibration-Map for high demands on quality
If you have a high demand on quality to the resulting calibration parameters, it is recommended to use the high precision Calibration-Map which can be obtained here.
This extremely planar and solid plate is supplied in the size DIN-A1, and is thereby suitable for nearly all applications.
However if photographs within the macro range shall be calibrated for a camera with a variable focus, then, for high precision results, the Calibration-Map size has to be adapted to the appropriate focus setting.
For this purpose the Calibration-Map should be photographed approximately in the same distance as the scene is photographed later. Therefore the Calibration-Map must approximately have a size, which for this distance ensures that as many Calibration-Points as possible are captured.
In spite of the fact that the distortion primarily depends on the adjusted focal length, which ImageIron automatically takes into account, also a change of the focus can have a (slight) influence on it with some lenses. If ever this becomes apparent just with photographs within the macro range however, as already mentioned.
High-quality Calibration-Maps in other (smaller) sizes than DIN-A1 can be provided on request.
Print out the Calibration-Map yourself
Using the pdf-document Calibration-Map.pdf, which can be found in the program folder, you can create a Calibration-Map printout yourself, which can either be put on the floor or be fastened with adhesive strips on a smooth wall/windowpane in order to take the pictures.
However a printout on paper, which easily warps and has a lack of flatness, will not be able to bring an optimal calibration parameter result compared to a direct printed sheet.
In order to achieve a visible optical enhancement of a distorted photography, this procedure is certainly sufficient.
|Continue with "Take Calibration-Pictures"|