line_position ( : : RowBegin, ColBegin, RowEnd, ColEnd : RowCenter, ColCenter, Length, Phi )
Calculate the center of gravity, length, and orientation of a line.
The operator line_position returns the center
(RowCenter, ColCenter), the (Euclidean) length
(Length) and the orientation (-pi/2 < Phi <= pi/2)
of the given lines. If more than one line is to be treated the line
and column indices can be passed as tuples. In this case the output
parameters, of course, are also tuples.
The routine is applied, for example, to model lines in order to
determine search regions for the edge detection
(detect_edges1).
Parameters
RowBegin (input_control)
|
line.begin.y(-array) -> integer
|
Row coordinates of the starting points of the
input lines. |
ColBegin (input_control)
|
line.begin.x(-array) -> integer
|
Column coordinates of the starting points of the
input lines. |
RowEnd (input_control)
|
line.end.y(-array) -> integer
|
Row coordinates of the ending points of the
input lines. |
ColEnd (input_control)
|
line.end.x(-array) -> integer
|
Column coordinates of the ending points of the
input lines. |
RowCenter (output_control)
|
point.y(-array) -> real
|
Row coordinates of the centers of gravity of the
input lines. |
ColCenter (output_control)
|
point.x(-array) -> real
|
Column coordinates of the centers of gravity of the
input lines. |
Length (output_control)
|
real(-array) -> real
|
Euclidean length of the input lines. |
Phi (output_control)
|
angle.rad(-array) -> real
|
Orientation of the input lines. |
Result
line_position always returns the value TRUE.
Possible Predecessors
sobel_amp,
edges__,
threshold__,
hysteresis_threshold__,
split_skeleton1,
split_skeleton2
Possible Successors
set_line_width,
disp_line
Alternatives
line_orientation,
select_lines1,
select_lines2
See also
line_orientation,
select_lines1,
select_lines2,
detect_edges1
Copyright © 1996-1997 MVTec Software GmbH