How to find value PSNR,MSE and SNR of an image?

i have two m file first i save with PSNR.m that contain

function psnr= PSNR(X,Y)
%Calculates the Peak-to-peak Signal to Noise Ratio of two images X and Y
[M,N]=size(X);
m=double(0);
X=cast(X,'double');
Y=cast(Y,'double');
for i=1:M
  for j=1:N
      m=m+((X(i,j)-Y(i,j))^2);
  end
end
m=m/(M*N);
psnr=10*log10(255*255/m);

and at second m file

   function checkbox1_Callback(hObject, eventdata, handles)
global noiseImage
fontSize = 13;
%applyNoise(handles);
%function applyNoise(handles)
if isfield(handles,'imgData')
   imgData = handles.imgData;
   noiseStr = '';
   d = get(handles.popupmenu1,'Value')
   items = get(handles.checkbox1,'String');
     if get(handles.checkbox1,'Value')
       noiseStr = 'Salt & pepper';
       imgData = imnoise(imgData,'salt & pepper',d);
       PSNR_1=psnr(imgData,img)
       set(handles.edit6, 'String',num2str(PSNR_1),'FontSize', fontSize);
     end
     if get(handles.checkbox2,'Value')
        if ~isempty(noiseStr)
            noiseStr = [noiseStr ', '];
        end
        noiseStr = [noiseStr 'Gaussian'];
        imgData = imnoise(imgData,'gaussian',0.1,0.1);
     end
      if get(handles.checkbox3,'Value')
        if ~isempty(noiseStr)
            noiseStr = [noiseStr ', '];
        end
        noiseStr = [noiseStr 'localvar'];
        imgData = imnoise(imgData,'localvar',0.05*rand(size(imgData)));
      end
     if get(handles.checkbox4,'Value')
        if ~isempty(noiseStr)
            noiseStr = [noiseStr ', '];
        end
        noiseStr = [noiseStr 'poisson'];
        imgData = imnoise(imgData,'poisson');
     end
     if get(handles.checkbox5,'Value')
        if ~isempty(noiseStr)
            noiseStr = [noiseStr ', '];
        end
        noiseStr = [noiseStr 'speckle'];
        imgData = imnoise(imgData,'speckle', 0.3);
     end

     axes(handles.axes2);
     imshow(imgData);
     PSNR_1=psnr(imgData,imgData)
     mse_1=mse(imgData,imgData)
     SNR_1=snr(imgData,imgData)
     set(handles.edit6, 'String',num2str(PSNR_1),'FontSize', fontSize);
     set(handles.edit7, 'String',num2str(mse_1),'FontSize', fontSize);
     set(handles.edit8, 'String',num2str(SNR_1),'FontSize', fontSize);
     title(['Noise type: ' noiseStr,]);
     noiseImage = imgData;
     end

     I want to show value PSNR,MSE and SNR when i add noise of checkbox 1 at edittext,but the     value doesnt show.Hope someone can help me

Answer 1

[Image Analyst]

Why not simply use the built in psnr() and immse()?

[amira fauzey]

can you show me how to do it,i dont know how to get the value from checkboxes

[Image Analyst]

For example to get the value from checkbox2:

checkBox2Value = handles.checkbox2.Value;

[amira fauzey]

when i use

err = immse(imgData, imgData);
set(handles.edit7, 'String',err,'FontSize',     fontSize);

it show error ??? Undefined function or method 'immse' for input arguments of type 'uint8'.

[Walter Roberson]

immse was introduced in Image Processing Toolbox in R2014b. Which MATLAB release are you using, and do you have that toolbox installed?

[amira fauzey]

I am using R2010a, sorry i'm not sure. I never use Matlab toolbox

[Image Analyst]

Type ver on the command line.

[amira fauzey]