how to create columns in a image

i have more number of rows in an image so for equalizing with columns i need to add some columns can any one suggest .

[Ram]

how to create new columns without losing image information

[Guillaume]

Explain better what you want to do.

• Add columns of black (white?) to the image?
• resize the image so that it has a square aspect ratio?
• something else?

[Ram]

i am having empty rows & columns in which number of empty rows are more.I want to add some additional columns such that number of empty rows & empty columns are same.

Answer 1

[Image Analyst]

You can just assign some lower right row,column and it will extend the canvass to the right, and below with zeros:

grayImage = imread('cameraman.tif'); % Originally 256x256
size(grayImage) % Show size in command window.
% Expland image to be 400 by 600 by padding with zeros.
grayImage(400, 600) = 0;
imshow(grayImage);
size(grayImage) % Show size in command window.

Alternatively, if you want to expand the canvass on all sides, you can use padarray().

[Ram]

In the solution provided rows & columns are given manually but if i want to add varying number of columns for different template images then

[Image Analyst]

You must know, or be able to determine through some algorithm, the number of rows and columns. It can still be varying but in the end, they end up with some value, right? Like they might be 400x600 one time, and 480x640 the next time, but you still must know what they are. Even if you get random sizes by using randi(), you still know what they are.

Answer 2

[Walter Roberson]

[r, c, ~] = size(YourImage);
if r > c
  YourImage(r,r,:) = 0;       %extend it with 0's
end

[Ram]

its not creating additional columns as required

[Guillaume]

You need to be clearer as to what is required then,

Walter's code will create additional columns. It also does not lose any information. It just adds columns of black.