how to convert image values into pixels and viceversa

how to obtain 2d matrix from a image and recover image from pixels

Answer 1

[Dev]

Hi @srinath g,

Since you aim to obtain a 2D matrix from an image, I am assuming that you are working with grayscale images. We can first read the image file using the ‘imread’ function in MATLAB. More information on the same can be referred below-

https://www.mathworks.com/help/releases/R2024a/matlab/ref/imread.html

In case the image is coloured (RGB), we can convert the same to a grayscale image using the ‘rgb2gray’ function in MATLAB. More details on this function can be referred below-

https://www.mathworks.com/help/releases/R2024a/matlab/ref/rgb2gray.html

Next, we can use the below code to read it into a 2D matrix-

% 2D matrix representing the image
matrix_2d = double(image);

The grayscale image pixel data is stored in ‘matrix_2d’ and the image can be recovered from this data using the ‘mat2gray’ MATLAB function. More information on the same can be referred to below-

https://www.mathworks.com/help/releases/R2024a/images/ref/mat2gray.html

I hope this is solves the purpose.