Draw Bangladesh Flag Using Matlab

Prerequisite: RGB image representation
A colored image can be represented as a 3 order matrix. The first order is for the rows, the second order is for the columns and the third order is for specifying the color of the corresponding pixel. Here we use the RGB color format, so the third order will take 3 values of Red, Green ans Blue respectively. The values of the rows and columns depending on the size of the image.

Approach:

  • Make a 3 order zero matrix of dimensions 300 X 400 X 3. 300 denotes the number of pixels for rows, 400 denotes number of pixels for columns and 3 denotes the color coding in RGB format.
  • Paint the complete image in bottle green.
  • Using the equation of circle paint the circle bright red.
    The equation of circle:



    ((x-h)^2 - (y-k)^2)=r^2 

    where (h, k) are the centers, (x, y) are co-ordinates of x-axis and y-axis and is the radius of the circle.

Below is the implementation:

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I=zeros(300, 400, 3);
% here image is of class ‘uint8’, the range of values
% that each colour component can have is [0 – 255]
I=uint8(I);
%painting the whole image Bottle Green
I(:, :, 1)=0;
I(:, :, 2)=106;
I(:, :, 3)=78;
%loop for rows i.e. for x-axis
for i=100:200
%loop for columns i.e. for y-axis
  for j=150:250
%The equation of circle to make the circle in the center.
    if round(sqrt((i-150)^2+(j-200)^2)<50)
% Paint the circle with Bright Red
      I(i, j, 1)=244;
      I(i, j, 2)=42;
      I(i, j, 3)=65;
       end % end if loop.
  end % end column loop.
  end % end row loop.
% show the image formed.
imshow(I);

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Output:



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