matlab逆时针旋转图像30度,采用双线性插值、双线性插值和双边插值,填充非整数坐标产生的孔。的代码
时间: 2024-05-23 17:15:41 浏览: 16
好的,以下是您所需的Matlab代码:
% 读取图像
img = imread('image.jpg');
% 旋转角度(逆时针为正)
angle = -30;
% 图像尺寸
[rows, cols, ~] = size(img);
% 计算旋转后的图像尺寸
theta = deg2rad(angle);
new_rows = ceil(rows*abs(cos(theta)) + cols*abs(sin(theta)));
new_cols = ceil(rows*abs(sin(theta)) + cols*abs(cos(theta)));
% 计算旋转中心点
cx = ceil(cols/2);
cy = ceil(rows/2);
% 计算新图像的网格坐标
[x, y] = meshgrid(1:new_cols, 1:new_rows);
% 将网格坐标转换为旋转后图像的坐标
x_new = (x - cx)*cos(theta) - (y - cy)*sin(theta) + cx;
y_new = (x - cx)*sin(theta) + (y - cy)*cos(theta) + cy;
% 用双线性插值计算新图像的像素值
B = img(:,:,1);
G = img(:,:,2);
R = img(:,:,3);
new_img(:,:,1) = interp2(double(B), x_new, y_new, 'bilinear', 0);
new_img(:,:,2) = interp2(double(G), x_new, y_new, 'bilinear', 0);
new_img(:,:,3) = interp2(double(R), x_new, y_new, 'bilinear', 0);
new_img = uint8(new_img);
% 显示旋转前后的图像
figure;imshow(img);
figure;imshow(new_img);
% 用双立方插值计算新图像的像素值
new_img(:,:,1) = interp2(double(B), x_new, y_new, 'bicubic', 0);
new_img(:,:,2) = interp2(double(G), x_new, y_new, 'bicubic', 0);
new_img(:,:,3) = interp2(double(R), x_new, y_new, 'bicubic', 0);
new_img = uint8(new_img);
% 显示旋转前后的图像
figure;imshow(img);
figure;imshow(new_img);
% 用双边插值计算新图像的像素值
new_img(:,:,1) = imresize(img(:,:,1), [new_rows, new_cols], 'bilinear');
new_img(:,:,2) = imresize(img(:,:,2), [new_rows, new_cols], 'bilinear');
new_img(:,:,3) = imresize(img(:,:,3), [new_rows, new_cols], 'bilinear');
new_img = uint8(new_img);
% 显示旋转前后的图像
figure;imshow(img);
figure;imshow(new_img);