MATLAB: Create a test image of size 100 x 100 pixels with a circle of diameter 30 pixels at its center. Let the value of pixels inside the circle to be 100, and those outside be 85. How can i draw this using matlab

homework

if true
  % code
end

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See code in the FAQ: http://matlab.wikia.com/wiki/FAQ#How_do_I_create_a_circle.3F

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MATLAB: Get data within circular ROI

This code also works for non-integer positions and radii.

data=rand(200,200); %generate example data
radius = 20; %circle radius
centre = [100,100]; %circle centre
[X,Y]=ndgrid(1:size(data,1),1:size(data,2));
X=X-centre(1);Y=Y-centre(2);%shift coordinate grid
L=sqrt(X.^2+Y.^2)<=radius;
data_within_circle = data(L);

MATLAB: Changing the pixel value of a region defined by its contour points

binaryMask = poly2mask(x, y, rows, columns); % Make solid binaryMask.
grayImage(binaryMask) = 255; % Fill inside the mask with white.

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Related Solutions

MATLAB: Get data within circular ROI

MATLAB: Changing the pixel value of a region defined by its contour points

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