How do I make a 21x21 array from the center of a 200x150 array?

Question

Andrew Trammell 2019-10-14

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/485282-how-do-i-make-a-21x21-array-from-the-center-of-a-200x150-array

编辑： Star Strider 2019-10-14

This image is 200x150. How do I create a 21x21 array from the center of the 200x150 array?

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Star Strider 2019-10-14

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/485282-how-do-i-make-a-21x21-array-from-the-center-of-a-200x150-array#answer_396310

编辑：Star Strider 2019-10-14

I called your image ‘parrot grayscale.png’.

I = imread('parrot grayscale.png');
[r,c] = size(I);
sr = fix((r-21)/2);
sc = fix((c-21)/2);
I2121 = I(sr:sr+20, sc:sc+20);
figure
imshow(I2121)

EDIT — Corrected typographical error. Code otherwise unchanged.

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

Answer 2

Fabio Freschi 2019-10-14

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/485282-how-do-i-make-a-21x21-array-from-the-center-of-a-200x150-array#answer_396311

% dimensions
n = 21;   % rows
m = 21;   % cols
% load image
A = imread('grayscale.png');
% find center coordinate
iCenter = round(size(A)/2);
% indices to save
iRow = iCenter(1)-floor(n/2)+(1:n);
jCol = iCenter(2)-floor(m/2)+(1:m);
% extraction
B = A(iRow,jCol);
% plot
figure
imshow(B)