Adding noise to image and removing it with average filter

조회 수: 11(최근 30일)
Amad Kadir
Amad Kadir 2021년 10월 16일
댓글: Amad Kadir 2021년 10월 17일
.
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]))

답변(1개)

DGM
DGM 2021년 10월 16일
편집: DGM 2021년 10월 16일
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

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