MATLAB: How to append different arrays without normalization

appendingarrays

i have four arrays of different values and i have to append the arrays one after other vertically in a single array. i have tried this code

data=[i;j;blksz;avg]

but the problem i am facing is that values above 255 in array i and j are automatically normalized to 255. can anyone let me know how to fix it???

Best Answer

data = [double(i);double(j);double(blksz);double(avg)]

or using some suitable integer class which can contain the required values.

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MATLAB: How to do logarithmic image normalization

I suppose you just get a new image where the image is the log of the pixel value. It's used to enhance dark areas by expanding their range, while not clipping bright areas. Run the code below for a demo.

workspace;  % Make sure the workspace panel is showing.
% Read in and display the original gray scale image.
grayImage = imread('Cameraman.tif');
grayImage = double(grayImage);
subplot(2,1,1);
imshow(grayImage, []);
axis on;
title('Original Image', 'FontSize', 15);
% Enlarge figure to full screen.
set(gcf, 'Units', 'Normalized', 'OuterPosition', [0 0 1 1]);
% Give a name to the title bar.
set(gcf, 'Name', 'Demo by ImageAnalyst', 'NumberTitle', 'Off') 
% Take the log of it.  Add 1 to avoid taking log of zero.
logImage = log(grayImage+1);
% Normalize to the range 0-1.
normalizedImage = mat2gray(logImage);
% Display it.
subplot(2,1,2);
imshow(normalizedImage, []);
axis on;
title('Log Image', 'FontSize', 15);
% If you want a uint8 version, then you can multiply by 255
% uint8Image = uint8(255 * normalizedImage);
msgbox('Note how the coat has more details');

MATLAB: How to perform L2 normalization

If v is the vector do:

 v = v/norm(v);

(The 'norm' function gives L2 norm as a default.)

Best Answer

Related Solutions

MATLAB: How to do logarithmic image normalization

MATLAB: How to perform L2 normalization

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