1 Topic by vylem

  • vylem
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Hello,
I'm new with using Kinovea and I was wondering if this is possible.

I want to be able to measure the position of a single player on a pitch ( so distance to goal-line and distance to side-line )
on a single frame.
Is it possible using the perspective grid ? and using the measurement line ?

You can measure the length of the side-line and goal-line.
Can you derive the position of a certain player from this ?

The camera is placed high up in the stands and is perpendicular to the field.

I haven't found it in the forum topics although there is one topic that might mention the same problem.

Thanks for the respons.
gr

2 Reply by Chas Tennis

  • Chas Tennis
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vylem wrote:

................
I want to be able to measure the position of a single player on a pitch ( so distance to goal-line and distance to side-line )
on a single frame.
Is it possible using the perspective grid ? and using the measurement line ?

You can measure the length of the side-line and goal-line.
Can you derive the position of a certain player from this ?

The camera is placed high up in the stands and is perpendicular to the field. ..................

I don't know work very much with that type of measurement or know the answer to your question.  Generally, you need to have a scale and the field seems ideal.

To approach it try -

1) Place the 4 corners of the grid on the corners of the field.  The grid lines should show the player's position, x,y on the field. ?

2) If only 3 corners of the field are visible maybe placing 3 corners of the grid on those 3 points and making grid lines parallel to the field lines might properly place, orient and scale the grid. ?

3) Using 8.15 I could align & size the grid using 3 known points on the tennis court (corner, singles side line & baseline, one another point) and court lines.  I used more that the grid corners for alignments, I used some inner grid lines. 

I have not used a measurement line.