R*****s
发帖数: 2223 | 1 场上的队员看得到那根10码黄线吗？还是电视转播加的？ |
H**p
发帖数: 2504 | 2 看不见。
【在 R*****s 的大作中提到】
: 场上的队员看得到那根10码黄线吗？还是电视转播加的？
|
R*****s
发帖数: 2223 | 3
恩，多谢！
【在 H**p 的大作中提到】
: 看不见。
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r******e
发帖数: 244 | 4 那会被绊着吗？
【在 H**p 的大作中提到】
: 看不见。
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H**p
发帖数: 2504 | 5 lol, 场上根本就没有那条线啊，电视转播里加进去的。
【在 r******e 的大作中提到】
: 那会被绊着吗？
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R*****s
发帖数: 2223 | 6
i think he was teasing you
【在 H**p 的大作中提到】
: lol, 场上根本就没有那条线啊，电视转播里加进去的。
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f*********y
发帖数: 298 | 7 不会，但是踩到会被罚5码。
【在 r******e 的大作中提到】
: 那会被绊着吗？
|
H**p
发帖数: 2504 | 8 是吗？没看出来，是我太实心眼了，还觉得好笑呢。
【在 R*****s 的大作中提到】
:
: i think he was teasing you
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A**1
发帖数: 1517 | 9 哪个公司弄出来这个技术的？赚翻了吧
【在 H**p 的大作中提到】
: lol, 场上根本就没有那条线啊，电视转播里加进去的。
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h*****r
发帖数: 1864 | 10 发信人: holland (SuperXpert Ran DM), 信区: Football
标 题: Re: 1st down黄线技术是这样实现的
发信站: Unknown Space - 未名空间 (Fri Sep 10 14:18:50 2004) WWW-POST
The technique still needs manual interactions of videos. Anyone working in
the
augmented reality or 3D computer vision can design and implement the system
easily but this application is creative. They basically did three things:
- Playback camera calibration which determines six extrinsic camera
parameters, i.e., where the camera is located (x,y,z) and which direction
the
camera is looking at (alpha, beta, gama), and intrinsic camera parameters
(often five), including focal length, width aspect ratio, height aspect
ratio,
horizontal image center, and vertical horizontal center. In this way, given
a
3D coordinate in the world coordinate, you can determine its 2D image
coordinate in the playback camera. i.e, give the location, orientation, and
shape of a specific virtual object, we can see
how it looks in the viewpoint of the playback camera.
- Manually click the 2D position of the ball in the images obtained from one
or two calibrated cameras and calculate its 3D position. And then you can
know
all the parameters of the 3D yellow lines in the world coordinate, i.e., the
location and orientation of the 3D yellow line.
- Render the 3D yellow line into the playback camera. The only computings
involved here are just matrix multiplications. |
z*********h
发帖数: 133 | 11 system
Not as simple as this article claims.
note that a player or referee near the yellow line will occlude the line.
This is a much more difficult (but solvable) problem than getting camera
parameters or doing geometric transformation. |
z*********h
发帖数: 133 | 12 And BTW, since scoring system gives information such as "3rd and 17 on
steelers 1" (steelers in offense ;-), the whole process can be completely
automated
【在 z*********h 的大作中提到】
: system
: Not as simple as this article claims.
: note that a player or referee near the yellow line will occlude the line.
: This is a much more difficult (but solvable) problem than getting camera
: parameters or doing geometric transformation.
|
