Functions for manipulating bounding boxes (bb).
A bounding box (bb) is also known as a position vector or a rectangle
object. It is a four element vector with the fields: [x y w h]. A set of
n bbs can be stores as an [nx4] array, most funcitons below can handle
either a single or multiple bbs. In addtion, typically [nxm] inputs with
m>4 are ok (with the additional columns ignored/copied to the output).
bbApply contains a number of utility functions for working with bbs. The
format for accessing the various utility functions is:
outputs = bbApply( 'action', inputs );
The list of functions and help for each is given below. Also, help on
individual subfunctions can be accessed by: "help bbApply>action".
Compute area of bbs.
bb = bbApply( 'area', bb )
Shift center of bbs.
bb = bbApply( 'shift', bb, xdel, ydel )
Get center of bbs.
cen = bbApply( 'getCenter', bb )
Get bb at intersection of bb1 and bb2 (may be empty).
bb = bbApply( 'intersect', bb1, bb2 )
Get bb that is union of bb1 and bb2 (smallest bb containing both).
bb = bbApply( 'union', bb1, bb2 )
Resize the bbs (without moving their centers).
bb = bbApply( 'resize', bb, hr, wr, [ar] )
Fix bb aspect ratios (without moving the bb centers).
bbr = bbApply( 'squarify', bb, flag, [ar] )
Draw single or multiple bbs to image (calls rectangle()).
hs = bbApply( 'draw', bb, [col], [lw], [ls], [prop], [ids] )
Embed single or multiple bbs directly into image.
I = bbApply( 'embed', I, bb, [varargin] )
Crop image regions from I encompassed by bbs.
[patches, bbs] = bbApply('crop',I,bb,[padEl],[dims])
Convert bb relative to absolute coordinates and vice-versa.
bb = bbApply( 'convert', bb, bbRef, isAbs )
Randomly generate bbs that fall in a specified region.
bbs = bbApply( 'random', pRandom )
Convert weighted mask to bbs.
bbs = bbApply('frMask',M,bbw,bbh,[thr])
Create weighted mask encoding bb centers (or extent).
M = bbApply('toMask',bbs,w,h,[fill],[bgrd])
USAGE
varargout = bbApply( action, varargin );
INPUTS
action - string specifying action
varargin - depends on action, see above
OUTPUTS
varargout - depends on action, see above
EXAMPLE
See also bbApply>area bbApply>shift bbApply>getCenter bbApply>intersect
bbApply>union bbApply>resize bbApply>squarify bbApply>draw bbApply>crop
bbApply>convert bbApply>random bbApply>frMask bbApply>toMask
Piotr's Computer Vision Matlab Toolbox Version 3.30
Copyright 2014 Piotr Dollar. [pdollar-at-gmail.com]
Licensed under the Simplified BSD License [see external/bsd.txt]