how to transfer image pixel values into array

Question

sonam s 2014-2-20

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/116972-how-to-transfer-image-pixel-values-into-array

评论： Image Analyst 2014-2-20

采纳的回答： Image Analyst

transfer image pixel values into array for complete image

array(,1)=R value
array(,2)=G value
array(,3)=B value
array(,4)=x position
array(,5)= y position

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David Young 2014-2-20

The question does not make sense. array(,1) is not valid syntax - there needs to be something in front of the comma. Also, what are you transferring the values from?

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Answer 1

Image Analyst 2014-2-20

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https://ww2.mathworks.cn/matlabcentral/answers/116972-how-to-transfer-image-pixel-values-into-array#answer_125073

编辑：Image Analyst 2014-2-20

在 MATLAB Online 中打开

Try this:

for k = 1 : length(RValues)
  array(k, 1) = RValues(k);
  array(k, 2) = GValues(k);
  array(k, 3) = BValues(k);
  array(k, 4) = XValues(k);
  array(k, 5) = YValues(k);
end

OR

% For a complete image
k = 1;
[rows, columns, numberOfColorChannels) = size(rgbImage);
if numberOfColorChannels == 3
  for col = 1 : columns
    for row = 1 : rows
      array(k, 1) = rgbImage(row, col, 1);
      array(k, 2) = rgbImage(row, col, 2);
      array(k, 3) = rgbImage(row, col, 3);
      array(k, 4) = col;
      array(k, 5) = row;
      k = k + 1;
    end
  end
end

I don't know why you'd ever want this unless maybe you were exporting to some kind of modeling/cadcae program.

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Image Analyst 2014-2-20

sonam's "Answer" moved here, since it was not an answer.

1Start

2.img = input plain image.

3 rows, cols = size of img.

4 create array of (rows*cols , 5)

5 transfer img pixel values into array for complete image

array(,1)=R value

array(,2)=G value

array(,3)=B value

array(,4)=x position

array(,5)= y position

6 sort this array

7 img = form an image using this array

8 Invoke ImageEncryption(img, rows, cols)

9 End

Image Analyst 2014-2-20

I did 1-5 for you. To sort you just call the sort() function but I don't know what column you are sorting on. And 7 is unnecessary since you already have the image - you needed it to do steps 2-5. Only you know what you need to do for step 8.

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Answer 2

Adam 2014-2-20

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https://ww2.mathworks.cn/matlabcentral/answers/116972-how-to-transfer-image-pixel-values-into-array#answer_125075

在 MATLAB Online 中打开

If you mean array(:,1) = R value, then:

if true
  myImage = imread('myFile.img');
  array(:,1) = reshape(myImage(:,:,1),[],1); %red
  array(:,2) = reshape(myImage(:,:,2),[],1); %green
  array(:,3) = reshape(myImage(:,:,3),[],1); %blue
  [array(:,4),array(:,5)] = ind2sub(size(myImage(:,:,1)),1:numel(myImage(:,:,1)));
end