Segment the calibration table region in the image.

::find_caltab is used to determine the region of a plane calibration table with circular marks in the input image Image. First the input image is smoothed (see ::gauss_image); the size of the used filter mask is given by SizeGauss. Afterwards a thresholding operator (see ::threshold) with minimum gray value MarkThresh and maximum gray value 255 is applied. Among the extracted connected regions the most convex region with almost correct number of holes (corresponding to the dark marks of the calibration table) is selected. Holes with a diameter smaller than the expected size of the marks MinDiamMarks are eliminated to reduce the impact of noise. The number of marks is read from the calibration table description file CalTabDescrFile. The complete explanation of this file can be found within the description of ::create_caltab.

// read calibration image
HImage Image("calib-01.tiff") ;
// find calibration pattern
HRegion Caltab = Image.FindCaltab("caltab.descr",3,112,5);

::find_caltab returns H_MSG_TRUE if all parameter values are correct and an image region is found. The behavior in case of empty input (no image given) can be set via ::set_system('no_object_result',<Result>) and the behavior in case of an empty result region via ::set_system('store_empty_region',<true/false>). If necessary, an exception handling is raised.

::read_image

::find_marks_and_pose

::find_marks_and_pose, ::camera_calibration, ::disp_caltab, ::sim_caltab, ::caltab_points, ::create_caltab

Camera calibration