MATLAB: How to calculate length (y-axis in cm) and width (x-axis in cm) of rectangle in an image

Image Processing Toolboxrectangle dimension in cm in an image calculationrectangle lengthrectangle widthspatial calibration

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See my spatial calibration demo, attached. Let me know if you still have questions after that.

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MATLAB: MATLAB FFT (y-axis values)

You don’t say what your signal is, but perhaps the values are low because the amplitude of your signal is low. If you take the standard deviation of your signal, it should have a similar magnitude:

stdev_amplitude = std(amplitude)

MATLAB: How to make the ROI show on top of the image after drawing ROI with roipoly

Try this:

im = imread('cameraman.tif');
imagesc(im);
axis image off; 
colormap gray;
title('Please Draw ROI');
% Draw ROI
[binaryMask, x, y] = roipoly;
hold on;
plot(x, y, 'r.-', 'MarkerSize', 15);

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Related Solutions

MATLAB: MATLAB FFT (y-axis values)

MATLAB: How to make the ROI show on top of the image after drawing ROI with roipoly

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