find Centre of ball/3D model of picture

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awais rehman 2012-2-8

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编辑： Een Qurota Aini 2013-10-7

i want to find the centre of ball (almost solved thanks every one for helping)

http://imageshack.us/photo/my-images/685/97503698.png/

Now i want to create the 3D model of this picture which includes (Pitch ,wickets,and grass) how I can do this kindly help

THANKS

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awais rehman 2012-2-9

LOL if u have some thing important then just dont answer here and stop wasting ur time as well as mine thanks

Walter Roberson 2012-2-9

A matter is either urgent or it isn't.

I have removed the "urgent" indicator from the title.

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回答（5 个）

awais rehman 2012-2-9

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automatically.......when i convert this to binary there are many other white regions i dun know how to get only ball .....as am new to this

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Anton Semechko 2012-2-9

So do you still insist that you want to detect the ball automatically? Or are you willing to click on the image a couple of times to help locate the ball?

awais rehman 2012-2-9

automaticallly

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Image Analyst 2012-2-9

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Look for dark regions, not white. I'd take one of the color channels and then threshold for dark stuff. Then do some size filtering and shape filtering. See my BlobsDemo for an example of how to do segmentation. http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862

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Pramod Bhat 2012-2-9

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k. first crop out the unwanted portion of the image - that is background. Now only the ball remains in the image. now consider the middle row and middle column of the matrix. find the indices of the first and last non-zero element of both the mentioned column and row. find the length of them. the intersecting point is the center of the ball.

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Matt Tearle 2012-2-9

Are you doing this on a sequence (ie tracking frames of a video), or do you know anything else about the setup that could help you (like the camera position & zoom is fixed)? For example, in a video sequence, you expect the ball to appear at the bottom center of the frame as it leaves the bowler's hand. For most of it's flight, you expect it to be against a background of the pitch. And, in a video sequence, you expect the position to change in small increments from frame to frame. This could help you eliminate the false findings.

Also, you might be able to use the fact that the ball color is probably unique.

Image Analyst 2012-2-9

Yes, there are other dark regions there so you will have to do something to determine which is the ball, like compare video frames before and after and look for the regions that didn't change position much, or check for the shape (perimeter^2/(4*pi*area)), or something like that.

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awais rehman 2012-2-9

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http://imageshack.us/photo/my-images/819/19028011.jpg/

output of my code which shows three marker on picture one at ball second on bowler arm third on batsman leg but i need only one on balll....plz help

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awais rehman 2012-2-13

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cmon no 1 can do this?

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awais rehman 2012-2-13

can u do it 4 me?m stucked

Image Analyst 2012-2-13

Sorry I'm too busy with my real job to take on unpaid consulting jobs. To make a robust system is going to take more than a couple of minutes. Most of the code I paste here in Answers is just pulled from and adapted from existing demos I have done, so I don't really spend that much time on them even though it may look like a lot of code.

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