padarray for resizing canvas of images

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dan kin
dan kin 2014-10-18
评论： Image Analyst 2014-10-18
Hi,
I have multiply PNG images in one folder with different images sizes (height and width), how can I use the padarray function so they will have the same canvas size (according to the bigger image) without resizing them?
Thanks a lot

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回答（1 个）

Image Analyst
Image Analyst 2014-10-18
Not hard. Just get the sizes of both, get the max, and figure out what to pass to padarray()
[rows1, columns1, numberOfColorChannels1] = size(image1);
[rows2, columns2, numberOfColorChannels2] = size(image2);
maxRows = max(rows1, rows2);
maxColumns = max(columns1, columns2);
and so on...
  2 个评论
dan kin
dan kin 2014-10-18
Thanks.
Why in the code rows3 and columns3 do not match rows2 and columns2?
Code:
clc;
clear;
img=imread('pears.png');
[rows1, columns1, numberOfColorChannels1] = size(img);
rows2=1000;
columns2=2000;
imgpad = padarray(img,[rows2 columns2],'both');
imshow(imgpad);
[rows3, columns3, numberOfColorChannels1] = size(imgpad);
Image Analyst
Image Analyst 2014-10-18
Because that's not the way to use padarray. Read the instructions. The inputs are the number of rows you want to add, not the overall total rows.

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