create_rectification_grid — Generate a PostScript file, which describes the rectification grid.
create_rectification_grid generates a checkered pattern with NumSquares x NumSquares alternating black and white squares. This pattern is Width meters wide (and high). Around the pattern there is an inner frame of 0.3 times the width of one square, which continues the checkered pattern. The pattern is completed by a solid white outer frame of 0.7 times the width of one square. In the center of the pattern there are two circular marks, one black on a white square and one white on a black square. The radius of both marks correspond to one third of the side length of the respective enclosing square. These marks are used by gen_grid_rectification_map to rotate the detected layout of the grid points into the correct orientation. It is assumed that the black mark is positioned to the left of the white mark, when oriented correctly. The file GridFile contains the PostScript description of the rectification grid.
Width of the checkered pattern in meters (without the two frames).
Default value: 0.17
Suggested values: 1.2, 0.8, 0.6, 0.4, 0.2, 0.1
Recommended increment: 0.1
Restriction: 0.0 < Width
Number of squares per row and column.
Default value: 17
Suggested values: 11, 13, 15, 17, 19, 21, 23, 25, 27
Recommended increment: 2
Restriction: 2 <= NumSquares
File name of the PostScript file.
Default value: 'rectification_grid.ps'
File extension: .ps
find_rectification_grid returns 2 (H_MSG_TRUE) if all parameter values are correct and the file has been written successfully. If necessary, an exception is raised.
find_rectification_grid, saddle_points_sub_pix, connect_grid_points, gen_grid_rectification_map