How to flip my image

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Jesse Schultz 2019-8-21

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https://ww2.mathworks.cn/matlabcentral/answers/477025-how-to-flip-my-image

评论： Jesse Schultz 2019-8-21

I have an image that I must flip using a nested for loop to flip the image vertically and horizontally, I have written a code that I think works but there is something wrong with it that it isn't. What have I done wrong?

%make 2d arrays values
imageData=imread('image.png');
[row, column] =size(imageData)
newImage=[]
%Use nested loops to change image mirrored
for i=[row:-1:1];
    for j=[column:-1:1];
    transposedMatrix(column, row) = imageData(i,j);
    transposedMatrix
    end
    
   
end
imshow(transposedMatrix)

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Jesse Schultz 2019-8-21

编辑：Jesse Schultz 2019-8-21

flipped both vertically and horizontally

Adam 2019-8-21

Well, a flip instruction would be more like exchanging position i with row - i and j with column - j

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采纳的回答

Joel Handy 2019-8-21

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/477025-how-to-flip-my-image#answer_388485

编辑：Joel Handy 2019-8-21

The are a few problems with your code. First, if you want the image, you dont want to transpose. That will flip and rotate, As adam has pointed out, column and row, you arent actuall transposing anyway. A better and correct way to transpose is to use permute.

imageData=imread('image.png');
newImage = permute(imageData, [2 1 3]);
imshow(newImage);

To actually flip, you should be able to use the flip function

imageData=imread('image.png');
newImage = flip(imageData,1);
newImage = flip(newImage,2);
imshow(newImage);

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Joel Handy 2019-8-21

I that case . . .

%make 2d arrays values
imageData=imread('image.png');
[row, column] = size(imageData);
%Use nested loops to change image mirrored
for i=[1:row]
    for j=[1:column]
        newImage((row-i)+1, (column-j)+1) = imageData(i,j);
    end   
end
imshow(newImage)