cont_info_xld ( Contours : : : Length, Nx, Ny, Fpx, Fpy, Lpx, Lpy, Mean, Deviation )

Return XLD contour parameters.

cont_info_xld returns the following parameters for all XLD contours given in Contours:

- the number of contour points Length,
- the coordinates Nx and Ny of the normal vector of the regression
  line to the contour (i.e., least-squares approximating line),
- the sub-pixel precise coordinates Fpx and Fpy of the perpendicular
  projection of the start point of the contour onto the regression
  line,
- the sub-pixel precise coordinates Lpx and Lpy of the perpendicular
  projection of the end point of the contour onto the regression
  line,
- the mean of the Euclidian distance of the contour points to the
  regression line,
- the standard deviation of these distances.


Attention

Before the contour parameters can be returned by cont_info_xld, the parameters of the regression line to the contour must be calculated by calling regress_cont_xld.


Parameters

Contours (input_object)
xld_cont-array -> object
Input XLD contours.

Length (output_control)
integer-array -> integer
Number of contour points.

Nx (output_control)
real-array -> real
X-coordinate of the normal vector of the regression line.

Ny (output_control)
real-array -> real
Y-coordinate of the normal vector of the regression line.

Fpx (output_control)
real-array -> real
X-coordinate of the projection of the start point of the contour onto the regression line.

Fpy (output_control)
real-array -> real
Y-coordinate of the projection of the start point of the contour onto the regression line.

Lpx (output_control)
real-array -> real
X-coordinate of the projection of the end point of the contour onto the regression line.

Lpy (output_control)
real-array -> real
Y-coordinate of the projection of the end point of the contour onto the regression line.

Mean (output_control)
real-array -> real
Mean distance of the contour points to the regression line.

Deviation (output_control)
real-array -> real
Standard deviation of the distances to the regression line.


Possible Predecessors

regress_cont_xld


Possible Successors

select_cont_xld


See also

get_contour_xld, get_cont_attrib_xld, gen_contour_xld, gen_contour2_xld, lines_gauss, lines_facet, edges_sub_pix



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