bound2four.m ( File view )

• By yueqiaohuayuan 2014-11-17
• View(s)：3508
• Point(s)： 3
```			function rc_new = bound2four(rc)
%BOUND2FOUR Convert 8-connected boundary to 4-connected boundary.
%   RC_NEW = BOUND2FOUR(RC) converts an eight-connected boundary to a
%   four-connected boundary.  RC is a P-by-2 matrix, each row of
%   which contains the row and column coordinates of a boundary
%   pixel.  BOUND2FOUR inserts new boundary pixels wherever there is
%   a diagonal connection.

%   Copyright 2002-2004 R. C. Gonzalez, R. E. Woods, & S. L. Eddins
%   Digital Image Processing Using MATLAB, Prentice-Hall, 2004
%   \$Revision: 1.4 \$  \$Date: 2003/11/21 14:20:21 \$

if size(rc, 1) > 1
% Phase 1: remove diagonal turns, one at a time until they are all gone.
done = 0;
rc1 = [rc(end - 1, :); rc];
while ~done
d = diff(rc1, 1);
diagonal_locations = all(d, 2);
double_diagonals = diagonal_locations(1:end - 1) & ...
(diff(diagonal_locations, 1) == 0);
double_diagonal_idx = find(double_diagonals);
turns = any(d(double_diagonal_idx, :) ~= ...
d(double_diagonal_idx + 1, :), 2);
turns_idx = double_diagonal_idx(turns);
if isempty(turns_idx)
done = 1;
else
first_turn = turns_idx(1);
rc1(first_turn + 1, :) = (rc1(first_turn, :) + ...
rc1(first_turn + 2, :)) / 2;
if first_turn == 1
rc1(end, :) = rc1(2, :);
end
end
end
rc1 = rc1(2:end, :);
end

% Phase 2: insert extra pixels where there are diagonal connections.

rowdiff = diff(rc1(:, 1));
coldiff = diff(rc1(:, 2));

diagonal_locations = rowdiff & coldiff
...
...
```
...
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Contents.m5.98 kB2012-02-29|09:51
average.m651.00 B2012-02-29|09:51
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