How to run multiple instance of same program in java

Question

I am doing my final Year project on Speed Calculation using webcam. In this project we want to calculate speed of object by taking three sequential images whenever motion is detected. As given here: Raser Abwehr SpeedCam 2012 , in this three line RED BLUE and GREEN are made and whenever any vehicle cross it, it takes one snap.

For this I have idea that suppose my camera resolution is 640*480 hence I can divide X-Axis in three parts of 210px each therefore I can have three rectangular screens of size (210*480) . Now, I want that whenever any vehicle enters in Screen1 then it click a picture then it start second screen detector and when vehicle enters into second screen it takes second picture and at last it detect in third and click picture. Hence we have three picture and we can calculate Speed by process given here Calculating Speed using a Webcam

Presently, I am using JavaCV as Image Processing Library. It is just like running multiple instance of a single Java program to detect motion in different screen. Please suggest to me how i can do. Can Thread be useful here?

Answer 1

(More like a comment but it doesn't fit)
I'd suggest by starting try making it work by taking three pictures at a fixed interval (which you guess).

Then, if you want to address the issue of detecting speed of objects that are moving at quite different speeds, I'd just suggest by starting with taking as many pictures as possible once you detect any movement, for a sufficiently long time, and then figuring out afterwards which one you should use for the analysis.

I can see what you are trying to do but you should probably start with dumb things first. Just my two cents...