i want to matrix merge but find problem

clear all,clc;
a = imread('2.jpg');
b = a(1:160,1:110,:);
c = a(1:80,111:210,:);
d = a(1:160,211:320,:);
e = [b;c;d];
subplot(131),imshow(b),subplot(132),imshow(c),subplot(133),imshow(d);

i want to merge b、c、d matrix merge but show the error message:

Error using vertcat
Dimensions of matrices being concatenated are not consistent.

Error in in (line 7)
e = [b;c;d];

Answer 1

[Guillaume]

Well, yes, b, c and d must have the same number of columns for you to vertically concatenate them. your d has 10 more columns than b and c. You can reduce the number of columns in d (e.g. use 211:310 instead) if it's acceptable to you. If not, you need to explain what you want to do (rescale? pad?) for the smaller matrices.

[tsai kai shung]

i want to select the ROI to detect the taffic light so no need Multiple matrices just need i segmentation matrix

[Image Analyst]

What traffic light? All I saw was a cat.

Anyway, regardless, if you're going to stitch two arrays side-by-side, they must have the same number of rows, and if you're going to stitch two arrays above-and-below, they must have the same number of columns, regardless of what's in the photo.

[tsai kai shung]

like this i just use cat image to show

[Guillaume]

i want to select the ROI

What has this got with your initial question which attempts to stitch three images together?

It's really unclear what you're asking help about.