How can i read images for filtering using if else condition in GUI?

case '[-1 -1 0;-1 0 1;0 1 1]'

Image_gray = rgb2gray(app.Image);

c = [-1 -1 0;-1 0 1;0 1 1];

XG1 = imfilter(Image_gray,c,'parent',app.UIAxes_3);

imshow(XG1,'parent',app.UIAxes_3)

title('[-1 -1 0;-1 0 1;0 1 1]','parent',app.UIAxes_3)

end

[Stephen23]

What do you expect the 'parent' option to achieve? I do not see it mentioned in the IMFILTER documentation.

[PinYu Chen]

Place the image on app.UIAxes_3.

Answer 1

[Jan]

imfilter operates on the pixel values of an image. See: imfilter . There is no "parent" property, so simply omit this:

% XG1 = imfilter(Image_gray,c,'parent',app.UIAxes_3); 
  XG1 = imfilter(Image_gray,c);

imshow has a "parent" property, but this is a completely different command.

[PinYu Chen]

Thanks, but I changed the code and it still doesn't work.

[DGM]

Do you have Image Processing Toolbox?

If you don't, you can get partway there with conv2(), but you'll have to deal with edge padding and cropping. In this example, I'm replicating the "replicate" padding option, which is not the default behavior of imfilter(). The default can be accomplished by padding with zeros.

inpict = imread('cameraman.tif'); % the image
fk = ones(5)/25; % the filter

% pad the image
fw = size(fk);
outpict = [repmat(inpict(:,1,:),[1 fw(2) 1]) inpict ...
    repmat(inpict(:,end,:),[1 fw(2) 1])];
outpict = [repmat(outpict(1,:,:),[fw(1) 1 1]); outpict; ...
    repmat(outpict(end,:,:),[fw(1) 1 1])];
% filter the image
outpict = uint8(conv2(double(outpict),fk,'same'));
% crop off padding
outpict = outpict(fw(1)+1:end-fw(1),fw(2)+1:end-fw(2),:);

imshow(outpict)

Alternatively, MIMT imfilterFB() is more or less a drop-in replacement for imfilter(). Read the documentation and decide if the difference in default padding behavior is a problem for you. If it is, pick the options you want.

inpict = imread('cameraman.tif'); % the image
fk = ones(5)/25; % the filter

% this is part of MIMT
outpict = imfilterFB(inpict,fk);

imshow(outpict)