import_Conte: Extracts outlines coordinates from an image silhouette
Description
Provided with an image 'mask' (i.e. black pixels on a white background),
and a point form where to start the algorithm, returns the (x; y) coordinates of its outline.
Usage
import_Conte(img, x)
Arguments
img
a matrix of a binary image mask.
x
numeric the (x; y) coordinates of a starting point within the shape.
Value
a matrix the (x; y) coordinates of the outline points.
Details
Used internally by import_jpg1 but may be useful for other purposes.
References
The original algorithm is due to: Pavlidis, T. (1982). Algorithms
for graphics and image processing. Computer science press.
is detailed in: Rohlf, F. J. (1990). An overview of image processing and
analysis techniques for morphometrics. In Proceedings of the Michigan Morphometrics Workshop. Special Publication No. 2 (pp. 47-60). University of Michigan Museum of Zoology: Ann Arbor.
and translated in R by: Claude, J. (2008). Morphometrics with R. (p. 316). Springer.