increase image quality after decoder in matlab

To increase image quality after decoder in Matlab, you can use various image processing techniques such as denoising or enhancement. Here is an example code for image denoising using wavelet transform:

main.m
% Load image
I = imread('image.png');

% Add noise
J = imnoise(I, 'gaussian', 0.01);

% Perform wavelet denoising
wname = 'sym8'; % wavelet name
level = 2; % decomposition level
[C,S] = wavedec2(J, level, wname);
sigma = mad(C(:)) / 0.6745; % estimate noise standard deviation
threshold = sigma * sqrt(2*log(prod(S(1,:)))));
soft = 'soft'; % thresholding mode
XC = wthresh(C, soft, threshold);
Jden = waverec2(XC, S, wname);

% Show original and denoised image
figure; imshow(J);
title('Original Image');
figure; imshow(Jden);
title('Denoised Image');
552 chars
22 lines

This code uses the imnoise function to add Gaussian noise to the image, then applies wavelet denoising with soft thresholding using the wavedec2, wthresh, and waverec2 functions.

gistlibby LogSnag