Gray scale resolution matlab

Hi, how can ı do this? ı need codes.

Answer 1

[Image Analyst]

That's done with discretize(). I'm sure there is example code in the help like there is for all functions.

[akevg akevg]

ı have this codes its working but how can ı print side by side, like above image?

ı try but ı couldnt. can you help?

img_color = imread('peppers.png');

img_gray = rgb2gray(img_color);

figure(1); imshow(img_gray);

nLevels = 4; % change this to the desired level 2 or more

maxLevel = 256;

threshGap = maxLevel / nLevels;

thresholds = zeros(1, nLevels);

thresholds(nLevels) = maxLevel-1;

thresholds(1) = floor(threshGap);

for i = 2:nLevels-1

thresholds(i) = floor(thresholds(i-1) + threshGap);

end

grayGap = maxLevel / (nLevels - 1);

grayLevels = zeros(1, nLevels);

grayLevels(nLevels) = maxLevel - 1;

for i = 2:nLevels-1

grayLevels(i) = floor(grayLevels(i-1) + grayGap);

end

new_img = img_gray;

[rows, cols] = size(img_gray);

for i = nLevels:-1:1

%new_img(img_gray < thresholds(i)) = grayLevels(i); % you can use this line of

% code and remove the next double nested loops

for x=1:rows

for y =1:cols

if img_gray(x, y) < thresholds(i)

new_img(x, y) = grayLevels(i);

end

end

end

end

figure(2); imshow(new_img);

[Image Analyst]

Wow, I didn't say to do all that. I said to use discretize:

grayImage = double(imread('cameraman.tif'));
n = [256, 32, 16, 8, 4, 2];
for k = 1 : length(n)
    numLevels = n(k);
    posterizedImage = discretize(grayImage, numLevels);
    subplot(2, 3, k);
    imshow(posterizedImage, []);
    caption = sprintf('%d gray levels', numLevels);
    title(caption);
end

[Tilkesh]

Thanks

[Tilkesh]

% One simpple example using above code.

% Define the x and y coordinate range

x = linspace(-5,5,100);

y = linspace(-5,5,100);

% Create a meshgrid of the x and y coordinates

[X,Y] = meshgrid(x,y);

% Define the grating period and duty cycle

period = 10;

duty_cycle = 0.5;

% Calculate the phase of the grating

phase = exp(i*2*pi*(X./period));

% grayImage = double(imread('cameraman.tif'));

grayImage =angle(phase);

n=1:1:8

% n=2.^nn

% n = [256, 32, 16, 8, 4, 2];

for k = 1 : length(n)

numLevels = n(k);

posterizedImage = discretize(grayImage, numLevels);

figure(1); subplot(3, 3, 1);

imagesc(angle(phase));colormap(gray);axis off;axis tight;axis square; title('Original');

subplot(3, 3, k+1);

imshow(posterizedImage, []);

caption = sprintf('%d gray levels', numLevels);

title(caption);

figure(2); subplot(3, 3, 1);

plot(angle(phase(50,:)));title('Original');

subplot(3, 3, k+1);

plot(posterizedImage(50,:))

caption = sprintf('%d gray levels', numLevels);

title(caption);

end