如何使用MATLAB垂直翻转图像

先决条件： MATLAB中的图像表示

在MATLAB中，图像存储在矩阵中，矩阵的每个元素对应于图像的单个离散像素。如果我们反转每列中像素(矩阵的元素)的顺序，则可以垂直(沿x轴)翻转给定的图像，如下图所示。

代码1：使用MATLAB库函数

% Read the target image file
img = imread('leaf.png');
   
% Reverse the order of the element in each column
vertFlip_img = flip(img, 1);
   
% Display the vertically flipped image
imshow(vertFlip_img); 
title('Vertically flipped image');

代码2：使用矩阵处理

% Read the target image file
img = imread('leaf.png');
   
% Flip the columns vertically 
vertFlip_img = img(end : -1: 1, :, :);
   
% Display the vertically flipped image
imshow(vertFlip_img); 
title('Vertically flipped image');

代码3：使用矩阵处理(使用循环)

Approach:

• Read the source image file in MATLAB environment
• Get the Dimensions of the image matrix
• Reverse the order of the elements of each column in every image plane
• Display the water image (vertically flipped image).

下面是上述方法的实现：

% Read the target image file
img = imread('leaf.png');
   
% Get the dimensions of the image
[x, y, z] = size(img);
   
   
% Reverse elements of each column
% in each image plane (dimension)
for plane = 1 : z
    len = x;
    for i = 1 : x 
        for j = 1 : y
   
            % To reverse the order of the element
            % of a column we can swap the 
            % topmost element of the row with
            % its bottom-most element  
              
            if i < x/2 
                temp = img(i, j, plane);
                img(i, j, plane) = img(len, j, plane);
                img(len, j, plane) = temp;
                 
            end
        end
        len = len - 1;
    end
end
   
   
% Display the vertically flipped image
imshow(img); 
title('Vertically flipped image');

输入图片： leaf.png

输出：