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The Guile-CV procedures and methods to obtain and clean image particles.
Returns two values, a list of images (the particles) and a list of their bounding boxes in the original image.
Each returned image is a ‘particle’, which is a subpart of
image determined by its bounding box, given by the left
top right bottom values of the corresponding
‘entry’ in features (see im-features for a complete
description of a feature value list.
When #:clean is #t, which is the default,
im-particle-clean is called upon each particle (see below for a
description of the expected result).
Returns a new image.
Cleaning a particle (which is an image) means detecting and removing any object(s) that is(are) not connected to the ‘particle’ itself.
This procedure is based on the property that in a ‘particle’, which
is an (sub)image resulting from a im-crop based on the bounding
box coordinates as returned by im-features, there precisely is
one object that, if you call im-features upon particle,
would have its bounding box coordinates being the entire
particle. In other words, if you call im-particle-clean
upon an image that is not a ‘particle’, the result will just be a
black image.