How to check MatOfKeyPoint in java?

Question

How to check if a MatOfKeyPoints is empty or not?

MatOfKeyPoint matOfKeyPoint = new MatOfKeyPoint();

What I need is something like

    if(matOfKeyPoint.size() != 1x0){
    //..............................
    }

The Error is as below:

Multiple markers a this line:
Syntax Error on token "x0",delete this token
Incompatible operand types size and int

Any idea how to solve this problem?

Any help would be appreciated.

Juvanis · Answer 1 · 2015-10-30T08:21:18.477

2

1x0 is not a valid hex integer in Java. matOfKeyPoint.size() has return type of Size.

You should use:

if(matOfKeyPoint.empty())

edited Oct 30 '15 at 08:21

answered Oct 29 '15 at 13:22

Juvanis

1

or `if(!matOfKeyPoint.empty())` – Miki Oct 29 '15 at 13:52
if(matOfKeyPoint.size() != 0x0) is still incompatible – Jürgen K. Oct 29 '15 at 14:06
if(matOfKeyPoint.size() != 0) is incompatible as well – Jürgen K. Oct 29 '15 at 14:07
Looking at the Javadoc, size() returns a Size object, with a height, and a width. Look at those values. You can't compare an object reference to a primitive value in Java. – medloh Oct 29 '15 at 16:06
@JürgenK. check my answer again, please. – Juvanis Oct 30 '15 at 08:22

1 Answers1