Scientists have developed a software which can help prevent stampede. It can accurately detect when crowds are starting to build up to dangerous levels.German researchers who developed the new software said that it will give security staff the chance to disperse crowds to safety by pre-empting the problem.Lead researcher Barbara Krausz, from the Fraunhofer Institute for Intelligent Analysis and Information Systems in Sankt Augustin, Germany, said when people are trapped in ahighly congested area, they sway slowly from side to side in an effort to keep their balance.Krausz said, the software notices the motion by scrutinising the movement of each pixel between different frames of crowd video footage. And when there are highly symmetrical pixel motions, it means the crowd is swaying, or there is something unusualgoing on and alerts the operator by highlighting the area in red.