MATLAB Question.. Please add noise to following two matlab codes. First one incl

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MATLAB Question.. Please add noise to following two matlab codes. First one include image and second include sound data type.

clear all

%% transmitter

img = imread('hand.jpg'); % converts to rgb codes.

%data is converted into one row data:

data=reshape(img,1,numel(img));

data = double(data);

colors=unique(data);%colors in image are selected.

%occurance of colors:

[occurances,symbols] = hist(data, colors);

% Source Coding ---->Huffman Encoding:

[dict,avglen] = huffmandict(symbols,occurances/numel(data));

% encode with Huffman coding

coded_data = huffmanenco(data, dict);

% Channel Coding ----> Hamming Encoding:

%add noise

%% receiver

% Channel DeCoding ----> Hamming Decoding:

% Source DeCoding ----> Huffman Decoding:

decoded_data = huffmandeco(coded_data, dict);

%Received data is reshaped in order to get original data.

size_of_img = size(img);

received_img = reshape(uint8(decoded_data),size_of_img(1),size_of_img(2),size_of_img(3));

image(received_img); % display image

title('Decoded Image');

------------------------

clear all

%% transmitter

% ------>Digitizing

[y, Fs, nbits] = wavread('road.wav', 'double');

% Source Coding ---->Huffman Encoding:

% Channel Coding ----> Hamming Encoding:

%add noise

%% receiver

% Channel DeCoding ----> Hamming Decoding:

% Source DeCoding ----> Huffman Decoding:

% Mapping

Explanation / Answer

Add the following snippet to the first code:

noise_add = imnoise(img,'salt & pepper',0.02);
figure, imshow(img)
figure, imshow(noise_add)

Add the following code snippet to the second code:

x = sawtooth(y); % Create sawtooth signal.
z = awgn(y,10,'measured'); % Add white Gaussian noise.
plot(t,x,t,y) % Plot both signals.

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