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[Octave-bug-tracker] [bug #51884] [octave forge] (image) bwmorph(blackNw
From: |
anonymous |
Subject: |
[Octave-bug-tracker] [bug #51884] [octave forge] (image) bwmorph(blackNwhiteMatrix, "thicken", 1) returns negated result (+ strange behavior at border) |
Date: |
Thu, 31 Aug 2017 03:33:32 -0400 (EDT) |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:50.0) Gecko/20100101 Firefox/50.0 |
Follow-up Comment #7, bug #51884 (project octave):
In order to get a correct (i.e. not negated) result for "n==0" we
test for this case ...
case "thicken"
if (n > 0)
## 31-Aug-2017 MeJ:: going for a >>bwmorph(bw, 'thicken', n)<< and
including the "add border workaround"
add_border = 2*(min([ max(size(bw)), n ]));
bw_framed = false(size(bw,1)+(2*add_border),size(bw,2)+(2*add_border));
lb1 = (add_border+1); ub1 = (size(bw,1)+add_border);
lb2 = (add_border+1); ub2 = (size(bw,2)+add_border);
bw_framed(lb1:ub1,lb2:ub2) = bw;
bw = bwmorph (! bw_framed, "thin", n);
loop_once = true;
morph = @(x) bwmorph (x, "diag");
post_morph = @(x) ! x(lb1:ub1,lb2:ub2);
endif
## --------- original code fragement (as of octave forge package image
2.6.1)
## This implementation also "thickens" the border. To avoid this,
## a simple solution could be to add a border of 1 to the reversed
## image.
#
# bw = bwmorph (! bw, "thin", n);
# loop_once = true;
# morph = @(x) bwmorph (x, "diag");
Test case:
octave:5> test_bw = false(3,3); test_bw(3,1)=true;disp(test_bw);
0 0 0
0 0 0
1 0 0
octave:6> bw0=bwmorph(test_bw, 'thicken', 0)
bw0 =
0 0 0
0 0 0
1 0 0
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- [Octave-bug-tracker] [bug #51884] bwmorph(blackNwhiteMatrix, "thicken", 1) returns negated result (+ strange behavior at border), anonymous, 2017/08/29
- [Octave-bug-tracker] [bug #51884] [octave forge] (image) bwmorph(blackNwhiteMatrix, "thicken", 1) returns negated result (+ strange behavior at border), John W. Eaton, 2017/08/29
- [Octave-bug-tracker] [bug #51884] [octave forge] (image) bwmorph(blackNwhiteMatrix, "thicken", 1) returns negated result (+ strange behavior at border), anonymous, 2017/08/29
- [Octave-bug-tracker] [bug #51884] [octave forge] (image) bwmorph(blackNwhiteMatrix, "thicken", 1) returns negated result (+ strange behavior at border), Hartmut, 2017/08/29
- [Octave-bug-tracker] [bug #51884] [octave forge] (image) bwmorph(blackNwhiteMatrix, "thicken", 1) returns negated result (+ strange behavior at border), anonymous, 2017/08/30
- [Octave-bug-tracker] [bug #51884] [octave forge] (image) bwmorph(blackNwhiteMatrix, "thicken", 1) returns negated result (+ strange behavior at border), anonymous, 2017/08/30
- [Octave-bug-tracker] [bug #51884] [octave forge] (image) bwmorph(blackNwhiteMatrix, "thicken", 1) returns negated result (+ strange behavior at border), anonymous, 2017/08/30
- [Octave-bug-tracker] [bug #51884] [octave forge] (image) bwmorph(blackNwhiteMatrix, "thicken", 1) returns negated result (+ strange behavior at border), Hartmut, 2017/08/30
- [Octave-bug-tracker] [bug #51884] [octave forge] (image) bwmorph(blackNwhiteMatrix, "thicken", 1) returns negated result (+ strange behavior at border),
anonymous <=