如何将Mat的一行复制到OpenCv中的另一个Mat的列上? [英] How to copy a row of a Mat to another Mat's column in OpenCv?

问题描述

我有两个Mat:

A:
size(1,640)
B:
size(640,480)

我想将A复制到B的第一列，所以我使用A.copyTo(B.col(0)).但这失败了.怎么做?

I want to copy A to B's first column so I use A.copyTo(B.col(0)).But this failed. How to do it?

推荐答案

您在正确的轨道上！ Mat:col是要使用的匹配工具:)

You were on the right track! Mat:col is the matching tool to use :)

但是要注意，仅将一个col分配给另一个col不会按您预期的那样工作，因为Mat:col只会为您指定的矩阵列创建一个新的矩阵标题，而没有数据的真实副本.

But beware, simply assigning one col to another one won't work as you may expect it, because Mat:col just creates a new matrix header for the matrix column you specified and no real copy of the data.

示例代码:

B.col( 0 ) = A.col( 0 ); // won't work as expected

A.col( 0 ).copyTo( B.col(0) ); // that's fine

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