MATLAB: Applying smoothing to image

blurringimage processingImage Processing Toolboxmanual convolutionMATLABspatial filtering

How can I apply smoothing to the image with 3*3 filter mask without Image Processing Tool Box (Manually)

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Is it gray scale or color? And this seems to be the hot topic of the month. There are so many threads lately on manually computing blurring or filtering of images with nested for loops - just search for them. I'm attaching my demo.

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MATLAB: ULTRASOUND IMAGE PROCESSING: ROI, CONTRAST IN db

You can use drawcircle() to select a circular region of interest and then create a mask from the ROI. Then you can apply the formula to calculates the contrast value. For example

im = rgb2gray(im2double(imread('peacock.jpg')));
imshow(im);
roi = drawcircle;
mask = createMask(roi);
% formula for contrast value

MATLAB: How to get a count of all the pixels having a certain RGB value in an image

sum(sum(YourImage(:,:,1) == 0 & YourImage(:,:,2) == 255 & YourImage(:,:,3) == 0))

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MATLAB: ULTRASOUND IMAGE PROCESSING: ROI, CONTRAST IN db

MATLAB: How to get a count of all the pixels having a certain RGB value in an image

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