How to measure speed of bowling?

[Malcolm Merlyn]

Is there a way to measure speed of a ball from a video?Is there any such software or any other way of doing it?It would be interesting to measure the speed of a few bowlers when speed gun was not in use regularly. The bowlers i would want to measure are: Srinath Donald Waqar Devon Malcolm And the WI pace quatret

[panesarv]

I guess you could do some calculus :p

[Malcolm Merlyn]

what no one has an idea????:wall: som uch for the IItians and PHDs on this bluddy phorum

[akshayxyz]

:) I will let others reply for now (alcohol % in my system). It is far more complicated than the way you have postulated your question ( and input sources/parameters/variety).

[Malcolm Merlyn]

:) I will let others reply for now (alcohol % in my system). It is far more complicated than the way you have postulated your question ( and input sources/parameters/variety).

Well ofcourse it will be complicated.But i hope it can be done,and someone will help me do it.

[jusarrived]

do we have accurate reading even with the speed guns now ?

[Mariyam]

I'm a total science noob, so don't ask me to explain in detail. The speed gun that works on the principle of doppler effect.

[Malcolm Merlyn]

do we have accurate reading even with the speed guns now ?

Well atleast it gives an idea.

[Jersey #10]

You can roughly calculate it by doing Distance/Time The length of the pitch is 22 yards = 0.0201168 kilometers Basically obtain the time it takes the ball to go from the hands of the bowler to the batsman. Now convert the time from seconds to hour. And then plug it into the formula 0.0201168 / Time(h) = speed of the bowler

[Sir_Afridi]

http://lmgtfy.com/?q=how+to+measure+speed+of+bowling

[punjabi_khota]

He is asking abt finding speed frm video suckers

[vaibhav_delhi]

144kmph = 40m per seconds. Tht means the ball reaches the batsman in order of 0.5 seconds. If We have a video of say 250 frames per sec I think we can tell the speed of the bowler with good accuracy . That would mean that we are dividing 0.5 seconds into 125 parts.

[akshayxyz]

In addition to what Vaibhav said. For accurate measurement: Even if you get good frame rates, you still need to know the position of the camera relative to the pitch, or relative position of two cameras capturing the ball delivery simultaneously. For rough estimate - If you can get a continuous shot of ball crossing the pitch or a big section of it(pitch). Then you can roughly get the time it took to cross that from the video frames. Unless you are well funded, it will require quite some resources to make a software to do that for you. That too, given that for older videos (in fact for most of the public domain videos) - the frame rate is quite less and hence speed calculations will be off by huge margin. Add to that the error in estimating the the exact point of entry/exit of the ball on the pitch (due to camera angles and again low frame rates). So, for now, best option would be manually record the time by watching whatever video sources you have - in slowest motion possible. (Typical videos are no more than 30 frames /sec.)

[The Outsider]

In addition to things already mentioned : 1. The speeds that you see today are delivery speeds. Using videos the best you can hope for is the average speed, which would be significantly lower, because of air friction and of course bounce. 2. You would need multiple camera angles to get anywhere close to an accurate figure - the release point will be different for each delivery, and so will the impact point. You would need square on cameras to calculate the distance accurately. Even around a meter error in measurement, can give you an 8-10 kmph error in speed.

[vaibhav_delhi]

^Is it? I thought they were average speeds bcoz short balls show lesser speeds as the ball has to travel more distance after hitting the pitch which reduces ball's speed .

[The Outsider]

^Is it? I thought they were average speeds bcoz short balls show lesser speeds as the ball has to travel more distance after hitting the pitch which reduces ball's speed .

Short balls show slower speeds because the speed guns only measure the horizontal component of the velocity, which is lesser for short balls than full ones.

[vaibhav_delhi]

Short balls show slower speeds because the speed guns only measure the horizontal component of the velocity' date=' which is lesser for short balls than full ones.[/quote'] Then why on the slow pitches, speed gun shows less speeds?

[The Outsider]

Then why on the slow pitches' date=' speed gun shows less speeds?[/quote'] Do they? I wouldn't think so. I've seen speed guns clock the highest in England, and the pitches there are certainly not quick.

[Mariyam]

Since I'm a non science person, let me ask a stupid question.... When we say speed of the delivery, do we mean the speed of the ball when it has left the bowlers hand or that speed the instant before the batsman hits it. Contact with the ground must be having some impact on the speed of the ball. Right? PS: If this question is totally moronic, please don't bother answering. :haha:

[Sachin=GOD]

Since I'm a non science person, let me ask a stupid question.... When we say speed of the delivery, do we mean the speed of the ball when it has left the bowlers hand or that speed the instant before the batsman hits it. Contact with the ground must be having some impact on the speed of the ball. Right? PS: If this question is totally moronic, please don't bother answering. :haha:

I'm also not a science person but I think its the speed when it has left the bowler's hand. Contact with the ground decreases the speed if I'm not wrong.