Visualization of the sound pressure distribution in monitoring system of wireless sensor network

In order to show the sound pressure distribution in monitoring system of wireless sensor network, a two-dimensional visualization method is proposed according to the positions and pressures of the sensor nodes and target. An expansion and smooth method of the convex hull is presented, which is used to calculate the positions of the boundary points of drawing region. The positions and pressures of the points within the region are calculated through bi-cubic interpolation. Then the Delaunay-triangulation is made on these points and the pressures are mapped into colors. Lastly, the sound pressure distribution plane is drawn though the OpenGL triangle primitives. The application result shows that the visualization method could meet the monitoring system´s requirements in real time interaction.