Scanlab RTC6 PCIe Board Installation And Operation Manual page 225

• Mirroring around the y axis
(flipping in the x direction):
M
=
T
• Mirroring around the x axis
(flipping in the y direction):
M
=
T
• Mirroring around the first dimension diagonal
(exchanging the x and y coordinates):
M
=
T
• Skewing in the x direction by the angle 
(slanting):
M
=
T
Example: set_matrix( 1, 1, -0.25, 0, 1, 0 )
A general transformation defined by
set_matrix_list can also represent a combination of
various transformations (users can calculate the
corresponding matrix M
T
corresponding individual matrices in the correct
order).
RTC6 boards
Doc. Rev. 1.0.21 en-US
8 Advanced Functions for Scan Head Control and Laser Control
1 – 0
0 1
1 0
0 1 –
0 1
1 0
1 sin

–
0 1
set_matrix or
by multiplying the
Notes
• The described coordinate transformations are
primarily intended for small corrections when
setting up the scan system relative to the
Field. Separate settings for scaling and rotations
thereby provide more handling flexibility in
comparison to a single matrix setting.
• Initialization by load_program_file
offset of (0|0|0) and in matrices M
each predefined as identity matrices.
• Each matrix or offset definition overwrites prior
definitions.
• The RTC6 PCIe Board calculates the total matrix M
independently of the order in which the
individual transformation matrices were defined.
• The value range of scaling factor k for the scaling
matrix M is [–16...+16]. The value range for the
S
coefficients of the general transformation matrix
M is [–50...+50]. Also be sure that the value
T
range [–50...+50] for individual coefficients of
the total matrix M are not exceeded; otherwise
calculation of the corrected coordinates might
result, under some circumstances, in overflows.
• Rotations take place exclusively around the
centerpoint of the Image
relative to the axes.
• For each definition, the parameter at_once can be
used to specify whether the new setting should
have immediate effect on the current position
(at_once = 1 or 3) or whether it should only be
provisionally accumulated and cached
(at_once = 0 or 2). The most recently called
at_once parameter value determines when a
(accumulated) transformation takes effect.
Image
results in an
, M and M ,
S R T
Field; mirroring is
225