# Need Advise, How to Measure Punch Speed and Punch Power with Kinect?

• ### Question

• Hello everyone,

Here's I want to make an application for my Final Project, the concept is to make apps to measure how fast your punch and how much power for the punch. I'm using Kinect as my sensor.

For the first I use physics formula to measure the punch speed using Depth tracking.

I grab distance between player fists and kinect sensor. and use 2 marker that became my Distance area for measuring the speed of punch

distance between player fists is 1.6 meters and use 50cm distance area for measuring, so it's located from 1.5M to 1.0M using Kinect depth sensor measurement..user stand in front of kinect sensor.

and then I calculate the speed using Distance / Times or V=s/t.

for measuring Punch power I use the F=MxA, M is the mass of user in kilograms and A is acceleration for the fist. I use A = DeltaV/DeltaT to find acceleration speed.

But my mentor tells me that I cannot use that formulation because V=s/t have A=0, so if A=0 I cannot find the F in F=MxA.

So I need advice what method or formulation that I can use to measure Punch Speed and Punch Power?

Thanks.

Tuesday, July 9, 2013 6:11 AM

• Hello everyone,

Here's I want to make an application for my Final Project, the concept is to make apps to measure how fast your punch and how much power for the punch. I'm using Kinect as my sensor.

For the first I use physics formula to measure the punch speed using Depth tracking.

I grab distance between player fists and kinect sensor. and use 2 marker that became my Distance area for measuring the speed of punch

distance between player fists is 1.6 meters and use 50cm distance area for measuring, so it's located from 1.5M to 1.0M using Kinect depth sensor measurement..user stand in front of kinect sensor.

and then I calculate the speed using Distance / Times or V=s/t.

for measuring Punch power I use the F=MxA, M is the mass of user in kilograms and A is acceleration for the fist. I use A = DeltaV/DeltaT to find acceleration speed.

But my mentor tells me that I cannot use that formulation because V=s/t have A=0, so if A=0 I cannot find the F in F=MxA.

So I need advice what method or formulation that I can use to measure Punch Speed and Punch Power?

Thanks.