OpenCv on Darts Game

Re: OpenCv on Darts Game

> hi all,
> I have to use again OpenCv library to realize a program to recognize
> in automatic the score in the Darts game [1]
> I need your help to plan the logical steps to achieve my goal (count
> the score in the Darts game)
> I will use 1 webcam focused on the darts table.(I think that the
> position of the webcam is fundamental)
> So i would like to ask what kind of pixel manipulation (filtering,
> pattern recognition) could i apply to recognize where arrows are and
> conseguentely the score following the rules in the wikipage [1] ?

An idea that might need 2 cameras because of one dart covering another, but 
it's easy(ish) to do:-
 Place a camera on the ceiling or floor looking at the board at an acute 
angle.
 Calibrate the board by hand, by creating an ellipse drawing program and 
simply cover the boards edge and record this ellipse.. This can be automated 
if you want - but do that later. My guess is it would have to be really 
accurate though.
 Set up the software so you can detect changes from empty board to darted.
 The furthest change point is the tip of the buried dart head for each dart, 
beacuase of the acute angle used.
 Use the relative point position to the ellipse and calculate the dart 
position.
 You'll need a high res camera that keeps focus across the board too.

Just an idea...maybe crap....    : )

VC

Re: OpenCv on Darts Game

On Jan 31, 9:08=A0pm, "VelociChicken" <b...@yahoob.com> wrote:
> > hi all,
> > I have to use again OpenCv library to realize a program to recognize
> > in automatic the score in the Darts game [1]
> > I need your help to plan the logical steps to achieve my goal (count
> > the score in the Darts game)
> > I will use 1 webcam focused on the darts table.(I think that the
> > position of the webcam is fundamental)
> > So i would like to ask what kind of pixel manipulation (filtering,
> > pattern recognition) could i apply to recognize where arrows are and
> > conseguentely the score following the rules in the wikipage [1] ?
>
> An idea that might need 2 cameras because of one dart covering another, b=
ut
> it's easy(ish) to do:-
> =A0Place a camera on the ceiling or floor looking at the board at an acut=
e
> angle.
> =A0Calibrate the board by hand, by creating an ellipse drawing program an=
d
> simply cover the boards edge and record this ellipse.. This can be automa=
ted
> if you want - but do that later. My guess is it would have to be really
> accurate though.
> =A0Set up the software so you can detect changes from empty board to dart=
ed.
> =A0The furthest change point is the tip of the buried dart head for each =
dart,
> beacuase of the acute angle used.
> =A0Use the relative points position to the ellipse and calculate the dart
> position.
> =A0You'll need a high res camera that keeps focus across the board too.
>
> Just an idea...maybe crap.... =A0 =A0: )
>
> VC

Hi VC and JB. thanks a lot for your reply.
To do some trial i took photos of my professional dartboard(which is
used during the world champion) from an acute angle(i fixed a
photocamera not in front of the dartboard but in the left side to take
exaclty the Board that is attached on a red door ).So that input-image
is in the RGB space.
I realized a little program that simply draws an Elllipse on the
original image by using a hand-rectangle as exactly as possible.i
obtained this rectangle as image and i extracted the ellipse inside
it.
Then i processed this ellipse image via Canny and Normal and
Adaptative Threshold, i combined the result to obtain a binary image
which contain only the section of dartboard without any number . Of
course the previous speech doesn't consider the acute angle of the
camera because we try to map the original acute ellipse to an Ellipse
in the plane XY so maybe some error would happen during the counting
score.
Now i have to label the sectors of the final Binary image just to
record the score-points  that i have to assigned if a Dart arrive on
that section. I don't know how to do it. sometime i can't find some
relative point corrisponding to the dart head because it is black like
some sector of the dartboard...So i think that i have to do something
at the beginning to increase the contrast or something like this...
Right in this way?

I hope You can help me

Greets

Orazio D'Anna

Re: OpenCv on Darts Game

On Jan 31, 9:08=A0pm, "VelociChicken" <b...@yahoob.com> wrote:
> > hi all,
> > I have to use again OpenCv library to realize a program to recognize
> > in automatic the score in the Darts game [1]
> > I need your help to plan the logical steps to achieve my goal (count
> > the score in the Darts game)
> > I will use 1 webcam focused on the darts table.(I think that the
> > position of the webcam is fundamental)
> > So i would like to ask what kind of pixel manipulation (filtering,
> > pattern recognition) could i apply to recognize where arrows are and
> > conseguentely the score following the rules in the wikipage [1] ?
>
> An idea that might need 2 cameras because of one dart covering another, b=
ut
> it's easy(ish) to do:-
> =A0Place a camera on the ceiling or floor looking at the board at an acut=
e
> angle.
> =A0Calibrate the board by hand, by creating an ellipse drawing program an=
d
> simply cover the boards edge and record this ellipse.. This can be automa=
ted
> if you want - but do that later. My guess is it would have to be really
> accurate though.
> =A0Set up the software so you can detect changes from empty board to dart=
ed.
> =A0The furthest change point is the tip of the buried dart head for each =
dart,
> beacuase of the acute angle used.
> =A0Use the relative points position to the ellipse and calculate the dart
> position.
> =A0You'll need a high res camera that keeps focus across the board too.
>
> Just an idea...maybe crap.... =A0 =A0: )
>
> VC

Hi VC and JB. thanks a lot for your reply.
To do some trial i took photos of my professional dartboard(which is
used during the world champion) from an acute angle(i fixed a
photocamera not in front of the dartboard but in the left side to take
exaclty the Board that is attached on a red door ).So that input-image
is in the RGB space.
I realized a little program that simply draws an Elllipse on the
original image by using a hand-rectangle as exactly as possible.i
obtained this rectangle as image and i extracted the ellipse inside
it.
Then i processed this ellipse image via Canny and Normal and
Adaptative Threshold, i combined the result to obtain a binary image
which contain only the section of dartboard without any number . Of
course the previous speech doesn't consider the acute angle of the
camera because we try to map the original acute ellipse to an Ellipse
in the plane XY so maybe some error would happen during the counting
score.
Now i have to label the sectors of the final Binary image just to
record the score-points  that i have to assigned if a Dart arrive on
that section. I don't know how to do it. sometime i can't find some
relative point corrisponding to the dart head because it is black like
some sector of the dartboard...So i think that i have to do something
at the beginning to increase the contrast or something like this...
Right in this way?

I hope You can help me

Greets

Orazio D'Anna