Lucien Song - 2 months ago 13

C++ Question

It's perhaps a very basic question.

I want to build a cv::Mat from QVector. It works well in 8 bits Mat.

`QVector<uchar> vector;`

vector<<1<<289<<3000<<7<<2<<255<<266<<288;

Mat testMat(2,4,CV_8UC1,vector.data());

output:

`[ 1, 33, 184, 7;`

2, 255, 10, 32]

But when i use 16 bits Mat.

`QVector<uint> vector;`

vector<<1<<289<<3000<<7<<2<<255<<266<<288;

Mat testMat(2,4,CV_16UC1,vector.data());

The result becomes:

`[1, 0, 289, 0;`

3000, 0, 7, 0]

My question is why this happened and how to show without these 0.

Thank you!

Answer

`CV_16UC1`

has underlying type `unsigned short`

, but not `uint`

. Problem caused by different size of these types. Define your vector as `QVector<unsigned short> vector;`

. This should fix the problem:

```
QVector<unsigned short> vector;
vector<<1<<289<<3000<<7<<2<<255<<266<<288;
Mat testMat(2,4,CV_16UC1,vector.data());
```