www.pudn.com > fvsmatlabsourcecodebyRF.rar > Cropping.m

function [CroppedPrint] = cropping(XofCenter,YofCenter,CentralizedPrint) 
% Modified by PRTsinghua@hotmail.com 
 
N = 175; 
M=size(CentralizedPrint,1); 
 
imgN=size(CentralizedPrint,1); 
imgM=size(CentralizedPrint,2); 
   
if (YofCenter+30) <= M 
   YofCenter = YofCenter + 20; 
else 
   YofCenter = M; 
end 
 
X=XofCenter-floor(N/2); 
Y=YofCenter-floor(N/2); 
 
 
%命令行中能显示中心点 
%         ---------------- 
%         |              | 
%         |              | 
%         |       .      | y=row 
%         |              | 
%         |              | 
%         ---------------- 
%                x=column 
%XofCenter%   矩阵列 
%YofCenter%   矩阵行 
   
%------------------------------------------------------------- 
%          if A= 1 2 3 
%                4 5 6 
%                7 8 9 
%             B=A(1:2,2:3) 
%              = 2 3 
%                5 6 
%       creates B by extracting the first twos and last two  
%       columns of A 
%------------------------------------------------------------- 
if (YofCenter-floor(N/2)<1)||(YofCenter+floor(N/2)>imgN)||(XofCenter-floor(N/2)<1)||(XofCenter+floor(N/2)>imgM) 
    message='Cropping error: when the input image is cropped an error occurs: a possible error during center point determination.'; 
    msgbox(message,'Cropping Error','warn');    
    CroppedPrint=zeros(175); 
    return; 
else 
    CroppedPrint=CentralizedPrint(YofCenter-floor(N/2):YofCenter+floor(N/2),XofCenter-floor(N/2):XofCenter+floor(N/2)); 
end