balloon_ex.m
资源名称:Snakes.rar [点击查看]
上传用户:zlding2008
上传日期:2013-05-13
资源大小:1914k
文件大小:2k
源码类别:
2D图形编程
开发平台:
Matlab
- % EXAMPLE an example of balloon model on the room object
- %
- % Chenyang Xu and Jerry Prince 6/17/97
- % Copyright (c) 1996-97 by Chenyang Xu and Jerry Prince
- cd ..; s = cd; s = [s, '/snake']; path(s, path); cd examples;
- help balloon_ex;
- % Read in the 64x64 room image
- [I,map] = rawread('../images/room.pgm');
- % Compute its edge map
- disp(' Compute edge map ...');
- f = 1 - I/255;
- f0 = gaussianBlur(f,1);
- % note: snake potential is the negative of edge map
- disp(' Comute the traditional external force ...');
- [px,py] = gradient(f0);
- % display the results
- figure(1);
- subplot(121); imdisp(-f); title('snake potential');
- subplot(122); quiver(px,py);
- axis('square', 'equal', 'off', 'ij'); % fix the axis
- title('traditional force');
- % balloon deformation
- disp(' ');
- disp(' Press any key to start the deformation');
- pause;
- figure(1); subplot(121); cla;
- colormap(gray(64)); image(((1-f)+1)*40); axis('square', 'equal', 'off');
- t = 0:0.5:6.28;
- x = 32 + 3*cos(t);
- y = 32 + 3*sin(t);
- [x,y] = snakeinterp(x,y,2,0.5);
- snakedisp(x,y,'r')
- pause(1);
- for i=1:15,
- [x,y] = snakedeform2(x,y,0.05,0,1, 2, 0.15,px,py,5);
- [x,y] = snakeinterp(x,y,2,0.5);
- snakedisp(x,y,'r')
- title(['Deformation in progress, iter = ' num2str(i*5)])
- pause(0.5);
- end
- disp(' ');
- disp(' Press any key to display the final result');
- pause;
- figure(1); subplot(121); cla;
- colormap(gray(64)); image(((1-f)+1)*40); axis('square', 'equal', 'off');
- snakedisp(x,y,'r');
- title(['Final result, iter = ' num2str(i*5)]);