MATLAB: How to display variance of an image in command box

display varianceImage Processing Toolbox

median_image=medfilt2(im_n) axes(handles.axes3); imshow(median_image);

%variance% IM= im2double(median_image); V_image = var(IM(:));

Best Answer

Get rid of the semicolon and the value will report to the command window:

V_image = var(IM(:))

Beware though that im2double will scale the image to the range 0-1, so your variance will be the variance of that scaled image, not of the original image. If you want the variance of the original image, use double() instead of im2double().

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MATLAB: Threshold images and save as jpeg in loop

Use imwrite instead of save.

for i = 1:numel(I)
    % Obtain red matrix of image
    filename = fullfile(path, I(i).name);
    im = imread(filename);
    % Extract Red Channel
    b = im(:, :, 1);
    % Normalising red values
    Norm = double(b(:)) ./ 255;
    % Reshaping to fit image shape
    [f, g] = size(b);
    imn = imresize(Norm, [f, g]);
    % Threshold image
    thresh = imn .* imn>(0.6258);
    thresh_im =  uint8(thresh);
    % Save the image
    imwrite(thresh_im, ['img', num2str(i), '.jpg']);
end

MATLAB: What is the difference between double and im2 double

im2double converts to double and rescales the image to [0, 1].

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MATLAB: Threshold images and save as jpeg in loop

MATLAB: What is the difference between double and im2 double

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