Modified PSO method for automating transfer function designing in volume rendering
Yanni Wang · Journal of Zhejiang University(Engineering Science) · 2010
To reduce the complexity of human-computer interaction in volume rendering,this paper introduces an automated approach for transfer function designing in volume rendering.This approach transfers the abstract evaluation of a transfer function into the explicit evaluation of its rendering image,and then transfers the designing of a transfer function into a multi-parameter optimization problem.The image quality is assessed by combining image information entropy,differential entropy,boundary entropy,and human's subjective evaluation.Optimizing process utilizes an improved PSO(Particle Swarm Optimization)method which is strengthened by agenetic algorithm to avoid falling into the local optimum.The results of tests show that this modified PSO algorithm has a better global searching ability and efficiency in the application of volume rendering.The experimental results demonstrate that the proposed approach is able to design high-quality transfer functions according to the human's perspective in 1-2minutes for common cases.