MATLAB: Image processing using entropy

entropyentropyfiltimage processingImage Processing Toolbox

How can I process an image with the help of entropy?

Best Answer

There is an entropyfilt() function in the Image Processing Toolbox.

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MATLAB: Entropy ROI

Copy the points within the ROI in to vector and calculate the entropy of the vector. (With practice and logical indexing you will find it is not necessary to do the copying explicitly.)

MATLAB: How to convert the RGB image to grayscale without using the Image Processing Toolbox

To convert an RGB image to grayscale, you can use the RGB2GRAY command from the Image Processing Toolbox. If you do not have this toolbox, then you can use the standard NTSC conversion formula that is used for calculating the effective luminance of a pixel:

 intensity = 0.2989*red + 0.5870*green + 0.1140*blue

The following code can be used as an example:

% Assume you have an RGB image of class double, or create a random one
rgb = rand(200,200,3);
% Convert it 
gray = 0.2989 * rgb(:,:,1) + 0.5870 * rgb(:,:,2) + 0.1140 * rgb(:,:,3);

Best Answer

Related Solutions

MATLAB: Entropy ROI

MATLAB: How to convert the RGB image to grayscale without using the Image Processing Toolbox

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