Color image reading and writing experiment of MATLAB operation

Define a function Subsamp, enter a color image file name, output and display the color of half the size

Image (original, flip horizontally, flip vertically, center area red). You must use the control statement to successfully invoke the command Window!

Because color images are 3-dimensional, black-and-white images are 2-dimensional. If we're still using it when we halve the size of the image

>> f=imread (' e:\1.png ');>> f=f (1:2:end,1:2:end);>> imshow (f);

We'll find out. Three gray images arranged in a single side

So you can add 1 dimensions to the back.

The entire code is as follows

function [Img1,img2,img3,img4]=subsamp (filename); img1=imread (filename); i=1:4 Figure    switch I case        1            img1=img1 (1:2:end,1:2:end,:);% makes the image size halved            imshow (IMG1);        Case 2            img2=img1 (end:-1:1,:,:);% causes the image to flip horizontally            imshow (IMG2);        Case 3            img3=img1 (:, end:-1:1,:);% causes the image to flip vertically            imshow (IMG3);        Case 4            100*100 the image Center area red            [M,n,t]=size (IMG1);            IMG4=IMG1;            IMG4 (m/2-50:m/2+50,n/2-50:n/2+50,1) =255;            IMG4 (m/2-50:m/2+50,n/2-50:n/2+50,2) =0;            IMG4 (m/2-50:m/2+50,n/2-50:n/2+50,3) =0;            Imshow (IMG4);    EndEnd            

Run results

Color image reading and writing experiment of MATLAB operation