The experimental results on an MPEG-2 codec show that the algorithm efficiently reduces the ringing effect and improves video subjective quality while keeping the video average bitrate and video objective quality almost unchanged.
The paper introduces the way to evaluate the voice quality of mobile telecommunication system and elaborate the disadvantage of traditional language quality, emphasize the living testing example of object quality of evaluate way. At the same time, it introduced the EFR technology which improved the language quality.
Both subjective and objective simulations under the 3GPP/3GPP2 conditions show that the proposed algorithm a little outpe$orms that in the H.264 referece algorithm and based on directional interpolation.
The objective image quality evaluation of DCT(discrete cosine transform) compressed images is usually achieved using MSE(mean square error) and PSNR(peak signal to noise ratio) with the geometric degradation of images out of consideration, which is the very key to the optical measurement system based on position information.
Results obtained by computer simulation and analysis of the experimental data show that with nearly the same subjective and objective image quality as the Block Truncation Coding Method, the compression ratio is increased to 6.1-6.36 and the effect of eliminating the white noise is evident.
5. Researched the external quality assessment method of digital video, gave different indexes of the image sequence definition and liquidity degree about digital video structure conversion, there is consistent between the result of experiment and subjective assessment.
increase or decrease in spike frequency) was associated with object quality.
Thus, fish perceive capacitive properties as a separate object quality.
Electric polarity thus extends the "palette" of dielectric properties used by this fish to evaluate object quality, direction, and distance.
The animals were trained on a series of 6-trial object quality learning set problems followed by a series of 10-trial object quality learning set problems.
High ranking animals made more intraproblem errors than low ranking animals on the 6-trial problems, but there was no relationship between social status and the rapidity with which the object quality learning set was established.
An adaptive block truncation coding method is proposed. Results obtained by computer simulation and analysis of the experimental data show that with nearly the same subjective and objective image quality as the Block Truncation Coding Method, the compression ratio is increased to 6.1-6.36 and the effect of eliminating the white noise is evident.
This paper deals primarily with the adaptive method of image data compression. For a given monochrome digital image with low detail, an adaptive DCT data compression method is given and compared with adaptive DPCM method. The results of experiment have shown that the compression ability of adaptive DCT coding method is better than the DPCM. The performance of adaptive DCT coding is insenstive tO the statistics of the input image.
Some common objective quality evaluation measures for speech coding systems are compared in this paper.It is concluded that LPC CD (linear predictive coding cepstrum distance) is the the most effective measure for approximating subjective evaluation value.The LPC CD measure is discussed in detail.
本文比较了几种常见的语音编码系统客观质量评估方法,得出 LPC CD(法线性预测编码倒谱距离法)是一种最接近主观评估结果的客观质量评估方法的结论,并对 LPC CD 法作了详细的介绍。