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33 lines
1.2 KiB
33 lines
1.2 KiB
3 years ago
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function ZI = imageZoom( I,zmf )
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%----------------------˫���Բ�ֵ�����ž�����ͼ��---------------------------
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% Input��
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% I��ͼ���ļ���������������ֵ��0~255����
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% zmf���������ӣ������ŵı���
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% Output��
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% ���ź���ͼ������ ZI
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%-------------------------------------------------------------------
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%% Step2 ͨ��ԭʼͼ�����������ӵõ���ͼ���Ĵ�С����������ͼ����
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[IH,IW] = size(I);
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ZIH = round(IH*zmf); % �������ź���ͼ���߶ȣ�����ȡ��
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ZIW = round(IW*zmf); % �������ź���ͼ�����ȣ�����ȡ��
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ZI = zeros(ZIH,ZIW); % ������ͼ��
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%% Step3 ��չ����I��Ե
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IT = zeros(IH+2,IW+2);
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IT(2:IH+1,2:IW+1,:) = I;
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IT(1,2:IW+1,:)=I(1,:,:);IT(IH+2,2:IW+1,:)=I(IH,:,:);
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IT(2:IH+1,1,:)=I(:,1,:);IT(2:IH+1,IW+2,:)=I(:,IW,:);
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IT(1,1,:) = I(1,1,:);IT(1,IW+2,:) = I(1,IW,:);
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IT(IH+2,1,:) = I(IH,1,:);IT(IH+2,IW+2,:) = I(IH,IW,:);
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%% Step4 ����ͼ����ij�����أ�zi��zj��ӳ�䵽ԭʼͼ��(ii��jj)��������ֵ��
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for zj = 1:ZIW % ��ͼ�����а�����Ԫ��ɨ��
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for zi = 1:ZIH
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ii = (zi-1)/zmf; jj = (zj-1)/zmf;
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i = floor(ii); j = floor(jj); % ����ȡ��
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u = ii - i; v = jj - j;
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i = i + 1; j = j + 1;
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ZI(zi,zj,:) = (1-u)*(1-v)*IT(i,j,:) +(1-u)*v*IT(i,j+1,:)...
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+ u*(1-v)*IT(i+1,j,:) +u*v*IT(i+1,j+1,:);
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end
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end
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% ZI = uint8(ZI);
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end
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