hough_line_trans — Produce the Hough transform for lines within regions.
hough_line_trans calculates the Hough transform for
lines in those regions transmitted by
Region. Thereby the angles
and the lengths of the lines' normal vectors are registered in the parameter
space (the Hough- or accumulator space respectively). This means that the
parameterization is executed according to the HNF.
The result is registered in a newly generated Int2-Image
HoughImage), whereby the x-axis is equivalent to the angle between
the normal vector and the x-axis (in the original image), and the y-axis is
equivalent to the distance of the line from the origin.
The angle ranges from -90 to 180 degrees and will be registered with a
resolution of 1 /
AngleResolution, which means that one pixel
in x-direction is equivalent to 1 /
AngleResolution and that
HoughImage has a width of 270 *
+ 1 pixel. The height of the
HoughImage corresponds to the
distance between the lower right corner of the surrounding rectangle
of the input region and the origin.
The maxima in the result image are equivalent to the parameter values of the lines in the original image.
Binary edge image in which lines are to be detected.
Hough transform for lines.
Adjusting the resolution in the angle area.
Default value: 4
List of values: 1, 2, 4, 8
hough_line_trans returns the value 2 (H_MSG_TRUE)
if the input is not empty.
The behavior in case of empty input (no input regions available) is
set via the operator
the behavior in case of empty region is set via
If necessary an exception is raised.