Adding noise to image and removing it with average filter

.

guide me please?

im = imread('flower.tif');
noiseIm = imnoise(im, 'gaussian', 0.1); % adding the sine waves to the noise to image
subplot(2,3,1),imshow(noiseIm);
xlabel('Gaussian');
en = 127 ;
[x,y]=meshgrid(1:256,1:256 );
s=1+sin(x+y/1.5 );
grayImage = im ;
imshow(grayImage , [9 9])
ep=(double(en)/128+s)/4;
x = filter2(fspecial('average',3), noiseIm)/255; %removing nosie by the average filter method 
subplot(2,3,2), 
imshow(x);
label('Average Filter');
denoise2 = wiener2(noiseIm, []); %removing nosie by the wiener filter method 
subplot(2,3,3), imshow(denoise2);
xlabel('Wiener Filter');

Im getting the following errors and im not sure what I should do to fix

it. anything ideas?

(Error using images.internal.checkDisplayRange (line 19)

HIGH must be greater than LOW.

Error in images.internal.imageDisplayValidateParams (line 58)

common_args.DisplayRange = images.internal.checkDisplayRange(common_args.DisplayRange,mfilename);

Error in images.internal.imageDisplayParseInputs (line 79)

common_args = images.internal.imageDisplayValidateParams(common_args);

Error in imshow (line 253)

images.internal.imageDisplayParseInputs({'Parent','Border','Reduce'},preparsed_varargin{:});

Error in imageprocessing (line 11)

imshow(grayImage , [9 9]))

Answer 1

[DGM]

The line mentioned in the error is certainly nonsensical, but afaik it shouldn't actually throw an error (at least in R2009b - R2019b). Specifying a display range vector where both elements are equal has no purpose. I can't find where exactly in the input parsing it discards the parameter, but [9 9] is simply ignored, and the display uses the default [0 255] range.

Other changes are noted:

im = imread('cameraman.tif'); % i don't have that image, so i'm just using this
noiseIm = imnoise(im, 'gaussian', 0.1); % adding the sine waves to the noise to image
subplot(2,3,1), imshow(noiseIm);
xlabel('Gaussian');
en = 127 ;
[x,y] = meshgrid(1:256,1:256 );
s = 1+sin(x+y/1.5 );
grayImage = im;
imshow(grayImage) % use a valid range, or don't specify one
ep = (double(en)/128+s)/4;
x = filter2(fspecial('average',3), noiseIm)/255; %removing nosie by the average filter method 
subplot(2,3,2), 
imshow(x);
xlabel('Average Filter'); % typo
denoise2 = wiener2(noiseIm); % specifying the filter size with an empty vector is invalid syntax
subplot(2,3,3), imshow(denoise2);
xlabel('Wiener Filter');

Also note that the first subplot gets overwritten

[Amad Kadir]

Very helpful thank you.