don_thommo@hotmail.com

Hi, I'm going to have a good search of the forum for help after this so apologies if it has already been covered but it's very important so I wanted to get a post up early!

I am working on a part of a group project for my Masters and need a little help getting a game (similar to pong) working.

I have most things sorted but the thing I need help with is how to tell my webcam to focus in on two different specified regions onscreen at the same time.

Basically it is so that it can monitor two opposite rectangles (represented in real life by two coloured rectangles on the floor) in which the two players of the game will stand. The patch will then read the movement of the player up and down in their rectangle which will perform a variety of functions.

I assume there is some simple object that allows you to focus a window on just one part of the cams view, or at least I hope so!

I was originally going to use colour tracking to focus on them (which works to an extent) but then I realised that since the colours it was tracking were always static there must be a better way (to avoid flickering etc when using colour tracking).

I have most things sorted but the thing I need help with is how to tell my webcam to focus in on two different specified regions onscreen at the same time. 

focussing-a-webcam-on-two-specific-points

Sounds like jit.scissors would do the trick, if you just need to work with two separate areas from your webcam.

cv.jit.blobs externals would be good if you need to be specific with tracking the movements within the separated areas.

http://www.iamas.ac.jp/~jovan02/cv/download.html

This might help. You could even use jit.findbounds to give you the 

coordinates of your coloured rectangles, then enter them into the 

number boxes in the patch below. hope that helps

On Mar 24, 2008, at 10:39 PM, Ben Thompson wrote:

> Hi, I'm going to have a good search of the forum for help after 

> this so apologies if it has already been covered but it's very 

> important so I wanted to get a post up early!

> I am working on a part of a group project for my Masters and need a 

> little help getting a game (similar to pong) working.

> I have most things sorted but the thing I need help with is how to 

> tell my webcam to focus in on two different specified regions 

> Basically it is so that it can monitor two opposite rectangles 

> (represented in real life by two coloured rectangles on the floor) 

> in which the two players of the game will stand. The patch will 

> then read the movement of the player up and down in their rectangle 

> which will perform a variety of functions.

> I assume there is some simple object that allows you to focus a 

> window on just one part of the cams view, or at least I hope so!

> I was originally going to use colour tracking to focus on them 

> (which works to an extent) but then I realised that since the 

> colours it was tracking were always static there must be a better 

> way (to avoid flickering etc when using colour tracking).

This might help.  You could even use jit.findbounds to give you the  
coordinates of your coloured rectangles, then enter them into the  
number boxes in the patch below.  hope that helps

>
> Hi, I'm going to have a good search of the forum for help after  
> this so apologies if it has already been covered but it's very  
> important so I wanted to get a post up early!
>
> I am working on a part of a group project for my Masters and need a  
> little help getting a game (similar to pong) working.
>
> I have most things sorted but the thing I need help with is how to  
> tell my webcam to focus in on two different specified regions  
> onscreen at the same time.
>
> Basically it is so that it can monitor two opposite rectangles  
> (represented in real life by two coloured rectangles on the floor)  
> in which the two players of the game will stand. The patch will  
> then read the movement of the player up and down in their rectangle  
> which will perform a variety of functions.
>
> I assume there is some simple object that allows you to focus a  
> window on just one part of the cams view, or at least I hope so!
>
> I was originally going to use colour tracking to focus on them  
> (which works to an extent) but then I realised that since the  
> colours it was tracking were always static there must be a better  
> way (to avoid flickering etc when using colour tracking).
>
> Thanks in advance for any help:)


awesome thanks guys! I'm working with jit.scissors at the moment and seems to be going well. I basically cut the screen into 4 rows of 6 columns and then just took the left and right most columns as my "player areas" and applied motion detection on each square.

Basically meaning that the patch can read in where the player is in 4 different zones within his column and then relay this data to the Open GL part which sends a ball bouncing back and forth between the players (a bit like pong).

Thanks again for your quick responses guys, i'm extremely grateful!

Focussing a webcam on two specific points