Quadtree decomposition (Encoding) and Decoding of RGB Image: main.m - File Exchange

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Highlights from
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.

main.m

% % Test program for Quadtree Encoding and Decoding of RGB image
clc, close all, clear all
thvec=[0.5,0.5,0.5];  % threshold for red,green and blue (values b/w 0 and 1)
picname='rafting.png';
I = imread(picname);  
[ir ic d]=size(I);    % size of I must be M-by-N-by-3
figure, image(I)          % original input image
title('\bfOriginal Image');
% % ----------------------------------
% % RGB Quadtree Encoding
[S,valRGB]=qt3ddecom(I,thvec);  %lossy encoding
% % OR
% [S,valRGB]=qt3ddecom(I);      %lossless encoding
% % ----------------------------------
% % RGB Quadtree Decoding
Iback=qtreergbdecode(S,valRGB);  %Iback is approximated (reconstructed) image  
IbackTrim=Iback(1:ir,1:ic,:); %trim to original image size
% % ----------------------------------
figure, image(IbackTrim); % decoded image
title('\bfQuadtree Decoded Image');

% % % --------------------------------
% % % 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