Catalin Toma's profile - activity

Come think about it, if it is reliable, why not implement it with a marker on the paddle and if I get more experience, I will ask more specific questions. Thank you!

Well as I said, I have no experience with openCV,can you name some algorithms\tutorials for:

• finding an area filled with a color (maybe with a tolerance)
• finding an area matching a certain shape (I could go with finding imprefect circles)
• how to get an area of interest from the video, so I don't constantly need to search the entire image

I imagined the game to be played on a laptop,with a standard camera. I really hopped that color combined with the shape of the paddle would help me recognize it. I already know how to work out the 3d and physics part of the game, that was what I wanted to add to make it special: to play it with a paddle instead of the mouse.

I will try to simplify my requirements, since I cannot make assumptions about camera\light conditions.

Regarding position, I only need to know in which direction the paddle is moving, since I will map this to my world coordinates and also the player will look at the screen to see where the paddle is (with some hand-eye coordination I think he can play the game reasonably well).

I am more concerned with actually recognizing the paddle and finding it's orientation (the way I see it, the only assumptions I can make is the color and the fact that it has a simple shape).

Do you think I should approach this by searching the image by color? I've also heard of model based approaches, where I have a database of paddles, but would that mean I need a pattern for every orientation possible?

Thank you for the response,

I've looked at the links but unfortunately I can't make any assumptions regarding camera parameters and I can't add a marker (I want other people to play the game).

However, I have no problem with using assumptions related to the shape of the paddle (somewhat ellipse) and the color of the paddle (black\red).

So if I can positively recognize the paddle, finding in what direction it is moving should be simple (even if I use the size to determine if it is moving back\forth).

The big problem for me should be to determine the orientation of the paddle.

Can you point me into the right direction for recognizing the object? And later I can focus on the orientation part.

Thank you, Catalin.

Hello.

I've started working on a 3D game of table tennis. What I want is the user to play the game with an actual table tennis, and the game needs to track the orientation\position of the paddle.

I am new to OpenCV, can someone point me into the right direction?

Considering the simple shape of a paddle and the fact that the entire area has the same color, what should I be looking for regarding tracking where the paddle is? And regarding orientation of the paddle, what algorithm do I need to use?

Thank you in advance, Catalin.