Telecommunications provideers are projecting broadband services over IP network. This paper describes subjective quality of MPEG-2 bitstream impaired by packet losses over IP networks. The PC-based real-time MPEG-2 over IP system has been made as an experiment. Opinion tests shows that quality degraded by packet losses can be evaluated by number of lost packets, size of each packet, encoding type, and the error concealment method.
In this paper, the information compressed and transmitted and reconstructed system (ICTRS) of CGH has been established. JPEG baseline image processing sytem and the image reconstruction system of Fresnel transform technique have been adapted. The information of processed CGH has been analyzed and to compare the information distribution of processed CGH with the original CGH. At last the noise affect of processed CGH in ICTRS has also been analyzed. And this CGH processed method has been verified with experiments.
In this paper, we perform the comparison of the quality degradation between the coded stereo-scopic image and its 2 dimensional image. This comparison was based on MOS (Mean Opinion Score) which is obtained from the subjective evaluation experiment. The evaluation experiment of the 2 dimensional image was investigated for 3-D display sytem which was the same as the evaluation experiment of the stereoscopic image the quality evaluation model of the stereoscopic image (PQS_<stereo>) by using the result of the subjective evaluation experiment.
For the picture quality evaluation of Wavelet coding, we investigate the performanceestimation of picture quality evaluation model of monochrome still picture, which is already proposed for block-based picture coding. This evaluation model consists of the non-linear combination model whose components are 5 kinds of distortion factors and 11kinds of texture features. This model achieves the good estimation of the subjective picture quality in which the correlation coefficient between MOS and evaluated value are 0.97. Moreover, in case of the data which combined the data of JPEG coding and Wavelet coding, the correlation slightly decrease as 0.94.
Recently, the multimedia communications with video processing attract a great deal of attention. We developed a DSP "MSPM: Multimedia Signal Processor with embedded memory" with 0.35μm embedded DRAM technology in order to implement video processing software applicatins efficiently. The MSPM architecture progressed extremely the performance by SIMD hardware for image processing, and can make full use of high speed and high bandwidth memory interface on embedded DRAM. It has also two link ports for the scalable parallel video processing. The performances of a MSPM chip at 66 MHz reached to 800 MOPS and the maximum memory transfer speed achieved 1 1:1GB/s.