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How to obtain an homography from a single soccer image?

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2

I am trying to obtain an Homography of a soccer image shot by a broadcasting camera. The original picture:

I then proceed to find field lines, resulting in the following:

From what I understand, at least 4 points need to be detected. From the detected line, I should easily obtain 4 points by intersection of the lines. (I will extend the detected lines so they actually intersect)

The detected points can then be projected to another image. Since I do not have another image, I believe I should use a field model, like the one below.

Since field dimensions are known, every intersection point of the field model in world coordinates are known. For example: the middle of the field can be set to (0,0) (in meters). The top right of the field will then be (52.5,34) (in meters).

Now how do I set those world coordinates on the image?

python opencv

share|improve this question

asked 10 mins ago

Stan ZuttStan Zutt

112

New contributor

Stan Zutt is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Any particiular place are you looking at ? Are you collect all of the soccer stadiums ?
  
  – PROBERT
  2 mins ago
  

  
  
  
  

add a comment | 

2

I am trying to obtain an Homography of a soccer image shot by a broadcasting camera. The original picture:

I then proceed to find field lines, resulting in the following:

From what I understand, at least 4 points need to be detected. From the detected line, I should easily obtain 4 points by intersection of the lines. (I will extend the detected lines so they actually intersect)

The detected points can then be projected to another image. Since I do not have another image, I believe I should use a field model, like the one below.

Since field dimensions are known, every intersection point of the field model in world coordinates are known. For example: the middle of the field can be set to (0,0) (in meters). The top right of the field will then be (52.5,34) (in meters).

Now how do I set those world coordinates on the image?

python opencv

share|improve this question

asked 10 mins ago

Stan ZuttStan Zutt

112

New contributor

Stan Zutt is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Any particiular place are you looking at ? Are you collect all of the soccer stadiums ?
  
  – PROBERT
  2 mins ago
  

  
  
  
  

add a comment | 

I am trying to obtain an Homography of a soccer image shot by a broadcasting camera. The original picture:

I then proceed to find field lines, resulting in the following:

From what I understand, at least 4 points need to be detected. From the detected line, I should easily obtain 4 points by intersection of the lines. (I will extend the detected lines so they actually intersect)

The detected points can then be projected to another image. Since I do not have another image, I believe I should use a field model, like the one below.

Since field dimensions are known, every intersection point of the field model in world coordinates are known. For example: the middle of the field can be set to (0,0) (in meters). The top right of the field will then be (52.5,34) (in meters).

Now how do I set those world coordinates on the image?

python opencv

share|improve this question

asked 10 mins ago

Stan ZuttStan Zutt

112

New contributor

Stan Zutt is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

asked 10 mins ago

Stan ZuttStan Zutt

112

New contributor

Stan Zutt is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

asked 10 mins ago

Stan ZuttStan Zutt

112

New contributor

Stan Zutt is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked 10 mins ago

Stan ZuttStan Zutt

112

New contributor

Stan Zutt is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked 10 mins ago

Stan ZuttStan Zutt

112