Question

1. Snap a close-up color picture of a person with your phone or download a picture of your preference in JPG format, transfer/save it to a preferred location on your computer and import the picture into MATLAB. 2. Display the Red, Green and Blue components of the imported pictures in three subplots arranged horizontally; 3. Calculate the minimum and maximum values of the R, G, B components and display them in the titles of each subplots (HINT: perform this step along with step 2) 4. In a separate figure, display the image in full color using imagesc 5. Use the function ginput (1) to select the approximate coordinates of the center of one eye using a mouse click. Floor, ceil or round the returned coordinates to obtain an integer value. 6. Replace the eye with a red square. HINT: replace the color of the pixels centered on the eye (use the coordinates acquired in Step 4) with the red color. You can choose the side of the square arbitrarily, based on the resolution of the picture. 7. Re-display the picture as in step 4.

USE MATLAB TO SOLVE

Answer 1

The MATLAB Code is as follows:

clc
clear all
close all
image=imread('D:\images.jpg');
R=image(:,:,1); % extract RED Channel
G=image(:,:,2); % extract GREEN Channel
B=image(:,:,3); % extract BLUE Channel
minR=min(R,[],'all'); % find the minimum pixel value of R
maxR=max(R,[],'all'); % find the maximum pixel value of R
minG=min(G,[],'all'); % find the minimum pixel value of G
maxG=max(G,[],'all'); % find the maximum pixel value of G
minB=min(B,[],'all'); % find the minimum pixel value of B
maxB=max(B,[],'all'); % find the maximum pixel value of B
% display the three color channels in the same horizontal line using subplots
subplot(1,3,1),imshow(R),title(sprintf('Minimum R = %d\n Maximum R = %d',minR,maxR));
subplot(1,3,2),imshow(G),title(sprintf('Minimum G = %d\n Maximum G = %d',minG,maxG));
subplot(1,3,3),imshow(B),title(sprintf('Minimum B = %d\n Maximum B = %d',minB,maxB));
figure,imagesc(image); % display the color image using imagesc
[x,y]=ginput(1); %accept using input on coordinates of eye
x=ceil(x); % convert the decimal coordinate to integer value using ceil function
y=ceil(y);
% draw a square of size 10 x 10 around the center coordinates of the eye
for i=x-10:x+10 % from x - 10 to x + 10
     for j=y-10:y+10 % from y - 10 to y + 10
         image(j,i,1)=255; % make red value 255
         image(j,i,2)=0; % make green value 0
         image(j,i,3)=0; % make blue value 0
     end
end
figure,imagesc(image); % display the modified image

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OUTPUT:

Minimum R = 0 Maximum R = 255 Minimum G = 0 Maximum G = 244 Minimum B = 0 Maximum B = 240

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