An Improved 3D Holoscopic Image Coding Scheme Using HEVC Based on Gaussian Mixture Models

3D holoscopic system can provide continuous motion parallax throughout the viewing zone with precise convergence and depth perception, for which it is regarded as a promising technique for future 3D TV. In this paper, a 3D holoscopic image coding scheme based on Gaussian mixture models (GMM) is introduced firstly, taking full advantage of the intrinsic characteristic of such particular type of content. Due to the shortcomings of GMM based method, an improved method is thereafter put forward, in which many parameters that are insignificant in the final estimator of GMM based method are avoided, and more surrounding pixels are used to obtain the model parameters with the help of the least square method. Experimental results indicate that the improved method can obtain considerable gains over HEVC intra prediction and several other prediction methods.