八度选择图像的一部分

Question

我有一个 512x512 的二维图像，我想显示中间部分，即A(256-50:256+50,256-50:256+50)但无法使用imshow开始工作。

Answer 1

You can use imcrop function

pkg load image

x = 256-50;  // starting position (x cordinate)
y = 256-50;  // starting position (y cordinate)
a = 100;
b = 100;

B = imcrop(A, [x y a b]);
imshow(B);

This will crop the image starting from x,y by 100 pixels