mosaic.m
资源名称:Mosaic.zip [点击查看]
上传用户:cnhygg
上传日期:2016-09-08
资源大小:73k
文件大小:2k
源码类别:
软件设计/软件工程
开发平台:
Matlab
- % load input images
- I1 = double(imread('left.jpg'));
- [h1 w1 d1] = size(I1);
- I2 = double(imread('right.jpg'));
- [h2 w2 d2] = size(I2);
- % show input images and prompt for correspondences
- figure; subplot(1,2,1); image(I1/255); axis image; hold on;
- title('first input image');
- [X1 Y1] = ginput2(2); % get two points from the user
- subplot(1,2,2); image(I2/255); axis image; hold on;
- title('second input image');
- [X2 Y2] = ginput2(2); % get two points from the user
- % estimate parameter vector (t)
- Z = [ X2' Y2' ; Y2' -X2' ; 1 1 0 0 ; 0 0 1 1 ]';
- xp = [ X1 ; Y1 ];
- t = Z xp; % solve the linear system
- a = t(1); % = s cos(alpha)
- b = t(2); % = s sin(alpha)
- tx = t(3);
- ty = t(4);
- % construct transformation matrix (T)
- T = [a b tx ; -b a ty ; 0 0 1];
- % warp incoming corners to determine the size of the output image (in to out)
- cp = T*[ 1 1 w2 w2 ; 1 h2 1 h2 ; 1 1 1 1 ];
- Xpr = min( [ cp(1,:) 0 ] ) : max( [cp(1,:) w1] ); % min x : max x
- Ypr = min( [ cp(2,:) 0 ] ) : max( [cp(2,:) h1] ); % min y : max y
- [Xp,Yp] = ndgrid(Xpr,Ypr);
- [wp hp] = size(Xp); % = size(Yp)
- % do backwards transform (from out to in)
- X = T [ Xp(:) Yp(:) ones(wp*hp,1) ]'; % warp
- % re-sample pixel values with bilinear interpolation
- clear Ip;
- xI = reshape( X(1,:),wp,hp)';
- yI = reshape( X(2,:),wp,hp)';
- Ip(:,:,1) = interp2(I2(:,:,1), xI, yI, '*bilinear'); % red
- Ip(:,:,2) = interp2(I2(:,:,2), xI, yI, '*bilinear'); % green
- Ip(:,:,3) = interp2(I2(:,:,3), xI, yI, '*bilinear'); % blue
- % offset and copy original image into the warped image
- offset = -round( [ min( [ cp(1,:) 0 ] ) min( [ cp(2,:) 0 ] ) ] );
- Ip(1+offset(2):h1+offset(2),1+offset(1):w1+offset(1),:) = double(I1(1:h1,1:w1,:));
- % show the result
- figure; image(Ip/255); axis image;
- title('mosaic image');