i am encountering this error on below mention code Undefined function or variable 'greenchannel'. Error in bidemo (line 47) [Gout]=bilateral_each_channel(w,sigma_r,sigma_d,greenchannel);

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%%Clear everything
clear all;
close all;
clc;
v = VideoReader('peng.mp4');
tic
numFrames = v.NumberOfFrames;
k=1;
while k<=numFrames
  frame=read(v,k);
  frame=imresize(frame,[256 256]);
  frame=double(frame);
  [a b z]=size(frame);
    frame = frame/255.0;
% Extract the individual red, green, and blue color channels.
redChannel = frame(:, :, 1);
greenChannel = frame(:, :, 2);
blueChannel = frame(:, :, 3);
sigma = 0.1; %noise standard deviation
xr = redChannel + sigma*randn(size(redChannel));
xg = greenChannel + sigma*randn(size(greenChannel));
xb = blueChannel + sigma*randn(size(blueChannel));
noisyRGB = cat(3,xr,xg,xb);
w=9; % window size
sigma_d=1;
sigma_r=30;
tic;
[Rout]=bilateral_each_channel(w,sigma_r,sigma_d,redChannel);
[Gout]=bilateral_each_channel(w,sigma_r,sigma_d,greenchannel);
[Bout]=bilateral_each_channel(w,sigma_r,sigma_d,bluechannel);
frame(:,:,1)=(Rout);
frame(:,:,2)=(Gout);
frame(:,:,3)=(Bout);
rgbFixed = cat(3, redMF,greenMF,blueMF);
imshow([frame,noisyRGB,rgbFixed],[0,1])
  k=k+1;
end
finalpsnr1=avgPSNR1/numFrames
% finalpsnr2=avgPSNR2/numFrames
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