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0018 function B=sacasum(A,pto,lad,inte)
0019
0020 a=size(A);
0021 i=pto(1);
0022 j=pto(2);
0023 m=lad(1);
0024 n=lad(2);
0025 ptoent=floor(pto);
0026 dd=pto-ptoent;
0027
0028 if (sum(abs(dd))==0)|(inte==0)
0029 i=floor(i);
0030 j=floor(j);
0031 if floor(m/2)<m/2
0032 mf=i-ceil(m/2)+1;
0033 Mf=i+ceil(m/2)-1;
0034 else
0035 mf=i-floor(m/2)+1;
0036 Mf=i+floor(m/2);
0037 end
0038 if floor(n/2)<n/2
0039 mc=j-ceil(n/2)+1;
0040 Mc=j+ceil(n/2)-1;
0041 else
0042 mc=j-floor(n/2)+1;
0043 Mc=j+floor(n/2);
0044 end
0045 AAA=zeros(m,n);
0046 if (mf<1)|(Mf>a(1))|(mc<1)|(Mc>a(2))
0047 if (mf>a(1))|(Mf<1)|(mc>a(2))|(Mc<1)
0048 B=zeros(m,n);
0049 elseif ((mf<1)&(mc<1))&((Mf>1)&(Mc>1))
0050 fi=1-mf+1;
0051 ci=1-mc+1;
0052 AAA(fi:m,ci:n)=A(1:m-fi+1,1:n-ci+1);
0053 elseif ((mf<1)&(Mc>a(2)))&((Mf>1)&(mc<a(2)))
0054 fi=1-mf+1;
0055 cf=n-(Mc-a(2));
0056 AAA(fi:m,1:cf)=A(1:m-fi+1,a(2)-cf+1:a(2));
0057 elseif ((Mf>a(1))&(mc<1))&((mf<a(1))&(Mc>1))
0058 ci=1-mc+1;
0059 ff=m-(Mf-a(1));
0060 AAA(1:ff,ci:n)=A(a(1)-ff+1:a(1),1:n-ci+1);
0061 elseif ((Mf>a(1))&(Mc>a(2)))&((mf<a(1))&(mc<a(2)))
0062 cf=n-(Mc-a(2));
0063 ff=m-(Mf-a(1));
0064 AAA(1:ff,1:cf)=A(a(1)-ff+1:a(1),a(2)-cf+1:a(2));
0065 elseif (mf<1)&((Mf>1)&(mc>1)&(Mc<a(2)))
0066 fi=1-mf+1;
0067 AAA(fi:m,1:n)=A(1:m-fi+1,mc:Mc);
0068 elseif (mc<1)&((Mc>1)&(mf>1)&(Mf<a(1)))
0069 ci=1-mc+1;
0070 AAA(1:m,ci:n)=A(mf:Mf,1:n-ci+1);
0071 elseif (Mf>a(1))&((mf<a(1))&(mc>1)&(Mc<a(2)))
0072 ff=m-(Mf-a(1));
0073 AAA(1:ff,1:n)=A(a(1)-ff+1:a(1),mc:Mc);
0074 elseif (Mc>a(2))&((mc<a(2))&(mf>1)&(Mf<a(1)))
0075 cf=n-(Mc-a(2));
0076 AAA(1:m,1:cf)=A(mf:Mf,a(2)-cf+1:a(2));
0077 end
0078 B=AAA;
0079 else
0080 B=A(mf:Mf,mc:Mc);
0081 end
0082 else
0083 i=floor(i);
0084 j=floor(j);
0085 m=m+2;
0086 n=n+2;
0087 if floor(m/2)<m/2
0088 mf=i-ceil(m/2)+1;
0089 Mf=i+ceil(m/2)-1;
0090 else
0091 mf=i-floor(m/2)+1;
0092 Mf=i+floor(m/2);
0093 end
0094 if floor(n/2)<n/2
0095 mc=j-ceil(n/2)+1;
0096 Mc=j+ceil(n/2)-1;
0097 else
0098 mc=j-floor(n/2)+1;
0099 Mc=j+floor(n/2);
0100 end
0101 AAA=zeros(m,n);
0102 if (mf<1)|(Mf>a(1))|(mc<1)|(Mc>a(2))
0103 if (mf>a(1))|(Mf<1)|(mc>a(2))|(Mc<1)
0104 B=zeros(m,n);
0105 elseif ((mf<1)&(mc<1))&((Mf>=1)&(Mc>=1))
0106 fi=1-mf+1;
0107 ci=1-mc+1;
0108 AAA(fi:m,ci:n)=A(1:m-fi+1,1:n-ci+1);
0109 elseif ((mf<1)&(Mc>a(2)))&((Mf>=1)&(mc<=a(2)))
0110 fi=1-mf+1;
0111 cf=n-(Mc-a(2));
0112 AAA(fi:m,1:cf)=A(1:m-fi+1,a(2)-cf+1:a(2));
0113 elseif ((Mf>a(1))&(mc<1))&((mf<=a(1))&(Mc>=1))
0114 ci=1-mc+1;
0115 ff=m-(Mf-a(1));
0116 AAA(1:ff,ci:n)=A(a(1)-ff+1:a(1),1:n-ci+1);
0117 elseif ((Mf>a(1))&(Mc>a(2)))&((mf<=a(1))&(mc<=a(2)))
0118 cf=n-(Mc-a(2));
0119 ff=m-(Mf-a(1));
0120 AAA(1:ff,1:cf)=A(a(1)-ff+1:a(1),a(2)-cf+1:a(2));
0121 elseif (mf<1)&((Mf>=1)&(mc>=1)&(Mc<=a(2)))
0122 fi=1-mf+1;
0123 AAA(fi:m,1:n)=A(1:m-fi+1,mc:Mc);
0124 elseif (mc<1)&((Mc>=1)&(mf>=1)&(Mf<=a(1)))
0125 ci=1-mc+1;
0126 AAA(1:m,ci:n)=A(mf:Mf,1:n-ci+1);
0127 elseif (Mf>a(1))&((mf<=a(1))&(mc>=1)&(Mc<=a(2)))
0128 ff=m-(Mf-a(1));
0129 AAA(1:ff,1:n)=A(a(1)-ff+1:a(1),mc:Mc);
0130 elseif (Mc>a(2))&((mc<=a(2))&(mf>=1)&(Mf<=a(1)))
0131 cf=n-(Mc-a(2));
0132 AAA(1:m,1:cf)=A(mf:Mf,a(2)-cf+1:a(2));
0133 end
0134 BB=AAA;
0135 else
0136 BB=A(mf:Mf,mc:Mc);
0137 end
0138 B=zeros(m-2,n-2);
0139 for k=2:m-1
0140 for l=2:n-1
0141 S1=BB(k,l);
0142 S2=BB(k,l+1);
0143 S3=BB(k+1,l);
0144 S4=BB(k+1,l+1);
0145 B(k-1,l-1)=(1-dd(1))*((1-dd(2))*S1+dd(2)*S2)+dd(1)*((1-dd(2))*S3+dd(2)*S4);
0146 end
0147 end
0148 end