i am working on Image Compression Using Run Length Encoding
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am getting error in scanning in zigzag the error is as follows
Undefined function or variable 'toZigzag'.
Error in rlc_haar (line 21)
ImageArray=toZigzag(QuantizedImage);
plese help me
%%Matlab code for Image Compression Using Run Length Encoding
clc;
clear;
close all;
%%Set Quantization Parameter
quantizedvalue=10;
%%Read Input Image
InputImage=imread('cameraman.tif');
[row col p]=size(InputImage);
%%Wavelet Decomposition
[LL LH HL HH]=dwt2(InputImage,'haar');
WaveletDecomposeImage=[LL,LH;HL,HH];
imshow(WaveletDecomposeImage,[]);
%uniform quantization
QuantizedImage= WaveletDecomposeImage/quantizedvalue;
QuantizedImage= round(QuantizedImage);
% Convert the Two dimensional Image to a one dimensional Array using ZigZag Scanning
ImageArray=toZigzag(QuantizedImage);
%%Run Length Encoding
j=1;
a=length(ImageArray);
count=0;
for n=1:a
b=ImageArray(n);
if n==a
count=count+1;
c(j)=count;
s(j)=ImageArray(n);
elseif ImageArray(n)==ImageArray(n+1)
count=count+1;
elseif ImageArray(n)==b
count=count+1;
c(j)=count;
s(j)=ImageArray(n);
j=j+1;
count=0;
end
end
%%Calculation Bit Cost
InputBitcost=row*col*8;
InputBitcost=(InputBitcost);
c1=length(c);
s1=length(s);
OutputBitcost= (c1*8)+(s1*8);
OutputBitcost=(OutputBitcost);
%%Run Length Decoding g=length(s);
j=1;
l=1;
for i=1:g
v(l)=s(j);
if c(j)~=0
w=l+c(j)-1;
for p=l:w
v(l)=s(j);
l=l+1;
end
end
j=j+1;
end
ReconstructedImageArray=v;
%%Inverse ZigZag
ReconstructedImage=invZigzag(ReconstructedImageArray)
%%Inverse Quantization
ReconstructedImage=ReconstructedImage*quantizedvalue;
4 comentarios
Walter Roberson
el 16 de Jun. de 2024
Sure, you can combine zigzag scanning with RLE. The resulting code would be unclear and probably would be difficult to maintain. It would probably be much more effective to have a zigzag scan function separate from the RLE function.
Respuestas (1)
Walter Roberson
el 28 de Mzo. de 2018
That code is from https://www.pantechsolutions.net/image-processing-projects/image-compression-using-run-length-encoding and has been posted without attribution.
The complete code is being sold for 2000 rupees. It is not our place to duplicate commercial code for free.
Code for RLE encoding with zigzag scan has been posted a few times on MATLAB Answers -- zigzag scan is used by JPEG encoding, so there have been a number of posts of the code for that.
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