50 lines
2.0 KiB
Matlab
50 lines
2.0 KiB
Matlab
% Edge OR Corners detecting OR image smoothing using SUSAN technique.
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%
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% There are three different types of output:
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% 1. Logical (mask) array - This is the deffault type used with the edge detection
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% 2. Uint8 array - When '-ei' or '-ci' options are used
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% 3. Mx2 array of doubles with the indice corner coordinates
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%
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% Usage:
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% OUT = susan(GRAY, [options]);
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%
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% Where GRAY is a MxN intensity image
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% and [options] is any of the following '-opt' strings:
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%
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% -e : Edges mode - output a mask (logical) edges image [default]
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% -ei: Edges Image mode (overlay edges on input image)
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% -s : Smoothing mode
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% -c : Corners mode - output a Mx2 corners matrix with (image x,y corners coordinates)
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%
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% -ci: Corners Image mode (overlay corners on input image)
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%
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% See source code for more information about setting the thresholds
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% -t <thresh> : Brightness threshold, all modes (default=20)
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% -d <thresh> : Distance threshold, smoothing mode, (default=4) (use next option instead for flat 3x3 mask)
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% -3 : Use flat 3x3 mask, edges or smoothing mode
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% -n : No post-processing on the binary edge map (runs much faster); edges mode
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% -q : Use faster (and usually stabler) corner mode; edge-like corner suppression not carried out; corners mode
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% -b : Mark corners/edges with single black points instead of black with white border; corners or edges mode
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% -p : Output initial enhancement image only; corners or edges mode (default is edges mode)
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% SUSAN Version 2l (C) 1995-1997 Stephen Smith, DRA UK. steve@fmrib.ox.ac.uk
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%
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% Example1: Show original image overlain with detected edges
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% if IMG is a MxN image
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% edges = susan(IMG,'-ei');
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% image(edges)
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%
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% Example2: Show edges only
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% edges = susan(IMG,'-e');
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% image(edges) % imshow works better
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%
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% Example3: Show original image overlain with detected corners
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% edges = susan(IMG,'-ci');
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% image(edges)
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%
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% Author (of the mexification (not so minor work))
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% Joaquim Luis, jluis@ualg.pt
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%
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% Original C code and algorithm description at:
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% http://www.fmrib.ox.ac.uk/~steve/susan/
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