如何在图像中放置边距? [英] How can I put margins in an image?

问题描述

我有一张 18x18 像素的二进制图像，我想在该图像周围放置边距以获得 20x20 像素的图像.

I have a binary image of 18x18 pixels and I want to put margins around this image with the purpose of obtaining an image 20x20 pixels.

图像是二进制的，可以用1和0的矩阵表示.0 像素为黑色，1 像素为白色.我需要在我拥有的图像周围放置 1 个像素的零边距.

The image is binary and it can be represented by a matrix of 1s and 0s. The 0 pixels are in black colour and the 1 pixels are in white colour. I need to put margins of 1 pixel of zeros around the image that I have.

我该怎么做?

推荐答案

让我们来点 hackish:

Let's get hackish:

%// Data:
A = magic(3);                 %// example original image (matrix)
N = 1;                        %// margin size

%// Add margins:
A(end+N, end+N) = 0;          %// "missing" values are implicitly filled with 0
A = A(end:-1:1, end:-1:1);    %// now flip the image up-down and left-right ...
A(end+N, end+N) = 0;          %// ... do the same for the other half ...
A = A(end:-1:1, end:-1:1);    %// ... and flip back

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