how to convert matrix to image???

how do i convert matrix containing 1st column-x position 2nd column-y position 3rd column-height 4th column-width into output image it should compare with the original image and extract the components from it.

Please do help me

[stark iron]

@Stephen Cobeldick @Walter Roberson how do i do it?

[stark iron]

i have got 10*4 matrix

[Walter Roberson]

http://www.mathworks.co.uk/matlabcentral/answers/43073-a-guide-to-tags

[Stephen23]

@stark iron: how to do this? Just like solving any other task: the first thing is to understand the task itself: you do not need a computer and certainly MATLAB is not needed for this. Think about what you have, what you need, and what possible steps will be required. Plan it on a large piece of paper. Once you understand how this can be done, then start to think about what code could be used to do this. Come and ask us about specific commands or steps.

https://www.mathworks.com/matlabcentral/answers/228557-experts-of-matlab-how-did-you-learn-any-advice-for-beginner-intermediate-users

Answer 1

[Walter Roberson]

Guessing at what you mean about "compare with the original image and extract the components from it":

Assuming the control information is in YourMatrix and that the original image is YourImage:

ncol = size(YourMatrix, 1);
outputs = cell(ncol,1);
for K = 1 : ncol
  x = YourMatrix(K,1);
  y = YourMatrix(K,2);
  high = YourMatrix(K,3);
  wide = YourMatrix(K,4);
  this_extract = YourImage(y:y+high-1, x:x+wide-1, :);
  outputs{K} = this_extract;
end

Now outputs is a cell array containing the sub-sections of the image.

Somehow, I suspect that what you want to do is feature extraction based on the extracted portions and compare the results against a database of features of OCR'd characters to figure out which character you are probably looking at. Not that you said anything like that, but...

By the way, please re-check that the height is in the third position and the width is in the fourth position. If this matrix is being output by one of the extract_features routines then it almost certainly has the width in the third position and the height in the fourth position.

[stark iron]

@Walter Roberson Thank you!! But how do I put it into single matrix......matrix_1 = cell2mat(this_extract) i used this but it doesn't work. I want to display output in single image

[Walter Roberson]

Insufficient information about how the irregular sized extracts should be arranged relative to each other.

[stark iron]

@Walter Roberson how do i store generated output i.e cell array into single matrix or array.And display it in single image

[stark iron]

@Walter Roberson i have attached my code-code3.txt and image sss.png

[Walter Roberson]

combined_output = outputs{1};
for K = 2 : length(outputs)
  co_row = size(combined_output, 1);
  this_extract = outputs{K};
  te_row = size(this_extract, 1);
  %match rows
  if te_row < co_row
    this_extract(end+1:co_row, :, :) = 1;
  elseif te_row > co_row
    combined_output(end+1:te_row, :, :) = 1;
  end
  combined_output = [combined_output, this_extract];
end

Now combined_output has all of the parts stored in one matrix.

[stark iron]

Thank you so much sir!! @Walter Roberson. But the thing is that when i use B=imresize(combined_output,0.5); imshow(B); to display the image....it is displayed as the connected texts(joint texts) how do i add space between each components

[Walter Roberson]

num_space_columns = 5;
combined_output = outputs{1};
for K = 2 : length(outputs)
  co_row = size(combined_output, 1);
  this_extract = outputs{K};
  te_row = size(this_extract, 1);
  %match rows
  if te_row < co_row
    this_extract(end+1:co_row, :, :) = 1;
  elseif te_row > co_row
    combined_output(end+1:te_row, :, :) = 1;
    co_row = te_row;
  end
  combined_output = [combined_output, ones(co_row, num_space_columns), this_extract];
end

[stark iron]

Sir!Thank you so much for your great help @Walter Roberson

Answer 2

[KSSV]

Read about imwrite