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How to vertically flip an Image using MATLAB
• Last Updated : 14 Jan, 2020

Prerequisite: Image representation in MATLAB

In MATLAB, Images are stored in matrices, in which each element of the matrix corresponds to a single discrete pixel of the image. We can flip the given image vertically (along the x-axis), if we reverse the order of the pixels (elements of the matrix) in each column as illustrated in the below image. Code #1: Using MATLAB Library function

 `% 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'``); `

Code #2: Using matrix manipulation

 `% 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'``); `

Code #3: Using matrix manipulation (Using loops)

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).

Below is the implementation of the above approach:

 `% 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'``); `

Input image: `leaf.png` Output: Attention reader! Don’t stop learning now. Get hold of all the important CS Theory concepts for SDE interviews with the CS Theory Course at a student-friendly price and become industry ready.

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