Quadtree decomposition (Encoding) and Decoding of RGB Image: I=qtreergbdecode(S,valRGB) - File Exchange

Code covered by the BSD License

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Quadtree decomposition (Encoding) and Decoding of RGB Image

A =padtomakepowof2(A,varargin... % if required then add padvalue (defualt 0)
I=qtreedecode(S,values) % Decode QuadTree Represenation of Image given as Sparse matrix 'S' and
I=qtreergbdecode(S,valRGB) % Decode QuadTree date that is decomposed (encode) by qt3ddecom method
S=trimsparse(S) % trim sparse matrix by removing extra rows/columns that have all elements zeros.
[S,keys]=delsparsekeybyxANDy(...
[S,valRGB]=qt3ddecom(I,vararg... % This method uses three thresholds for red,green and blue blocks.
[b1r,b1c,b2r,b2c,b3r,b3c,b4r,... % The method uses three thresholds for red,green and blue blocks.
[b1r,b1c,b2r,b2c,b3r,b3c,b4r,... % given the size of rectangle (matrix end points), it split into four
avg=avgofmatblks(mat,i,j,w,h) % finds average of different blocks of input matrix
drawquadblocks(S) % draw square quad blocks of quadtree in eight basic colors.
fillrect_ulwh(ul,w,h,varargin... % fill the rectangle region specified by upper left corner width
flag=ispowerof2(n)
rgbimgnew =padrgbtomakepowof2... % if required then add padvalue (defualt 0)
var=converttoclass(var,type)
main.m
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from Quadtree decomposition (Encoding) and Decoding of RGB Image by Dr. Murtaza Khan
Quadtree decomposition (Encoding) and Decoding of RGB Image of size M-by-N-by-3.

I=qtreergbdecode(S,valRGB)

% % Decode QuadTree date that is decomposed (encode) by qt3ddecom method

% % Input
% % S: the quadtree structure in the sparse matrix S. If S(k,m) is
% %    nonzero, then (k,m) is the upper left corner (ULC) of a block in the
% %    decomposition, and the size of the block is given by S(k,m). 
% % valRGB(n,1:3):  mean (average) of RGB compoents for nth block

% % Output
% % I: Decoded Image

function I=qtreergbdecode(S,valRGB)

I(:,:,1)=qtreedecode(S,valRGB(:,1)); 
I(:,:,2)=qtreedecode(S,valRGB(:,2));
I(:,:,3)=qtreedecode(S,valRGB(:,3));

% % % --------------------------------
% % % Author: Dr. Murtaza Khan
% % % Email : drkhanmurtaza@gmail.com
% % % --------------------------------

Highlights from Quadtree decomposition (Encoding) and Decoding of RGB Image

Highlights from
Quadtree decomposition (Encoding) and Decoding of RGB Image