How to create a new square matrix with entries of each middle point of each subsection of another larger square matrix?

2 次查看（过去 30 天）

Borys Bulka 2020-11-4

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/635930-how-to-create-a-new-square-matrix-with-entries-of-each-middle-point-of-each-subsection-of-another-la

评论： Rik 2020-11-4

I have a square matrix of size 611x611 in which I want to create a grid on of 47 rows and 47 collums (I believe I can do this with matt2cell command?). Then I want to construct a new square matrix of size 47x47, in which every entry is the middle or approximate middle entry (doesn't have to be exactly the middle one) of each grid square in the 611x611 square matrix. I hope it is clear what I am trying to ask!

PS: If doing it with the middle entry is very difficult or not possible, then every entry of the the 47x47 square matrix being the average of the values of the grids in the 611x611 square matrix is also fine!

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。

采纳的回答

Rik 2020-11-4

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/635930-how-to-create-a-new-square-matrix-with-entries-of-each-middle-point-of-each-subsection-of-another-la#answer_533650

在 MATLAB Online 中打开

The code below requires the Image Processing toolbox, although you can do it with loops and mat2cell as well.

A=imread('pears.png');A=A(1:400,1:400,:);A=imresize(A,[611 611]);imshow(A)

fun_pick_middle=@(block) block.data(round(end/2),round(end/2),:);

B = blockproc(A,[611/47 611/47],fun_pick_middle);

imshow(B)

8 个评论
显示 6更早的评论隐藏 6更早的评论

Borys Bulka 2020-11-4

This makes much more sense now to me, thank you so much for your explenation it helped me a lot!

Rik 2020-11-4

You're welcome. If I solved your question, please consider marking my answer as accepted answer. If not, feel free to post a comment with your remaining issues.

请先登录，再进行评论。