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Extract outlines coordinates from an image silhouette

Source: R/babel-import.R
import_Conte.Rd

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.

Note

Note this function will be deprecated from Momocs when Momacs and Momit will be fully operationnal.

If you have an image with more than a single shape, then you may want to try imager::highlight function. Momocs may use this at some point.

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.

See also

Other import functions: import_StereoMorph_curve1(), import_jpg1(), import_jpg(), import_tps(), import_txt(), pix2chc()