Subject Evaluation of TMO Algorithm in Rendezvous and Docking Simulated Television Graphics

The fidelity of the simulated space scene could be enhanced through real-time TV graphics subject assessment, and adjusting parameters of tone mapping operator（TMO） algorithms. Based on the present study of the TMO algorithms used in processing the rendezvous and docking（RVD） simulated TV graphics, two experiments were designed to discuss about the application of S-curve algorithm, Adaptive logarithmic algorithm and Reinhard algorithm. The first experiment was the evaluation of luminance parameters based on static images, and the second experiment was the evaluation of TMO algorithm applied in different distance based on a dynamic scene. For making a comparison with each TMO algorithm, the average, the standard deviation and the HSD of the subject evaluation experiment were calculated. The results showed that the simulated RVD TV graphics was most similar to the real video when a luminance parameter 6.0 was used in S-curve algorithm to render the far distance region, 0.6 was used in adaptive logarithmic algorithm to render the middle and near distance region, and 2.2 was used in Reinhard algorithm to render the closest distance region. The experiments result arrived at a conclusion that the dynamic scene was better than the static image when the same TMO was used to processing the RVD virtual scene, and the virtual scene should be rendered by different TMO algorithms based on different distance regions in RVD mission.