I take mean value of an image:
I = imread('1.png'); val = mean2(I)
Because I want to set all images to an equal mean gray value, I need to equate the obtained mean to a specific value (e.g., 128).
Can you help me with this?
MATLAB: Taking mean value of a gray scaled image and equating it to across images
Image Processing Toolboxmean gray value
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Use subplot(), mean2(), and xlabel():
fontSize = 20;% Make 3 images.
grayImage1 = imread('cameraman.tif');grayImage2 = imread('moon.tif');grayImage3 = imread('pout.tif');% Display image 1 and mean of that image.
subplot(1, 3, 1);imshow(grayImage1, []);title('cameraman.tif', 'FontSize', fontSize, 'Interpreter', 'None');mean1 = mean2(grayImage1);caption = sprintf('Mean = %.2f', mean1);xlabel(caption, 'FontSize', fontSize);% Set up figure properties:
% Enlarge figure to full screen.
set(gcf, 'Units', 'Normalized', 'OuterPosition', [0 0 1 1]);% Get rid of tool bar and pulldown menus that are along top of figure.
set(gcf, 'Toolbar', 'none', 'Menu', 'none');% Give a name to the title bar.
set(gcf, 'Name', 'Demo by ImageAnalyst', 'NumberTitle', 'Off') % Display image 2 and mean of that image.
subplot(1, 3, 2);imshow(grayImage2, []);title('moon.tif', 'FontSize', fontSize, 'Interpreter', 'None');theMean = mean2(grayImage2);caption = sprintf('Mean = %.2f', theMean);xlabel(caption, 'FontSize', fontSize);% Display image 3 and mean of that image.
subplot(1, 3, 3);imshow(grayImage3, []);title('pout.tif', 'FontSize', fontSize, 'Interpreter', 'None');mean3 = mean2(grayImage3);caption = sprintf('Mean = %.2f', mean3);xlabel(caption, 'FontSize', fontSize);
No. There is no way to obtain the original gray level image from a binary image that has been created by thresholding that gray scale image. If you want the gray scale image later, be sure to save your gray scale image variable.
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