shuangxianxing.rar_matlab课程设计

>> clear; %此题是用双线性插值法实现图像缩放 I=imread('pepper.bmp'); %读入原图像 [rows,cols]=size(I); K1 = str2double(inputdlg('请输入行缩放倍数', 'INPUT scale factor', 1, {'0.5'}));%行默认变为原来的0.5倍 K2 = str2double(inputdlg('请输入列缩放倍数', 'INPUT scale factor', 1, {'0.4'}));%列默认变为原来的0.4倍 width = K1 * rows; height = K2 * cols; Out = uint8(zeros(width,height)); %创建输出图像矩阵 widthScale = rows/width; heightScale = cols/height; for x = 6:width - 6 % 6是为了防止矩阵超出边界溢出 for y = 6:height - 6 oldX = x * widthScale; % oldX,oldY为原坐标，x,y为新坐标 oldY = y * heightScale; if (oldX/double(uint16(oldX)) == 1.0) & (oldY/double(uint16(oldY)) == 1.0) Out(x,y) = I(int16(oldX),int16(oldY));%若oldX，oldY为整数，直接赋值 else a = double(uint16(oldX)); b = double(uint16(oldY)); x11 = double(I(a,b)); % x11 赋值为 I(a,b) x12 = double(I(a,b+1)); % x12 赋值为 I(a,b+1) x21 = double(I(a+1,b)); % x21 赋值为 I(a+1,b) x22 = double(I(a+1,b+1)); % x22 赋值为 I(a+1,b+1) Out(x,y) = uint8( (b+1-oldY) * ((oldX-a)*x21 + (a+1-oldX)*x11) + (oldY-b) * ((oldX-a)*x22 +(a+1-oldX) * x12) ); % 用双线性插值计算公式计算 end end end figure(1); imshow(I); figure(2); imshow(Out);