Question

I need help with a Matlab assignment.

Ignore step 5 please.

Additional Notes:

Gray scale images are stored in unsigned 8 bit integers, so in order to multiply a B matrix with a factor 0.5, etc. you will need to change the B matrix to a double precision.

You can do this by B=double(A).^0.5

since your matrix B is now double precision, you need to change it back to unsigned 8 bit integer and display.

You can do this by imshow(uint8(B)).

Answer 1

Here is the code for you:

%Use matlab command imread.

A = imread('FordEcosport.png');

figure;

imshow(A);

%Use matlab command rgb2gray.

B = rgb2gray(A);

figure;

imshow(B);

%Use matlab command size.

[a, b] = size(B);

%Raise each pixel values by a power of 0.5, 1, 1.5

B = double(A);

C = B.^0.5; %.^is raising by 0.5 for each array value.

D = B.^1;

E = B.^1.5;

F = B.^2;

G = B.^4;

figure;

imshow(uint8(C));

figure;

imshow(uint8(D));

figure;

imshow(uint8(E));

figure;

imshow(uint8(F));

figure;

imshow(uint8(G));

imwrite(B, 'B.png');

imwrite(C, 'C.png');

imwrite(D, 'D.png');

imwrite(E, 'E.png');

imwrite(F, 'F.png');

imwrite(G, 'G.png');

%Use matlab command im2bw.

H = im2bw(B, 0.5);

I = imresize(A, 0.5);

figure;

imshow(I);