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MPEG-4视频压缩编码的算法优化

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计算机时代 2008年第8期 62-64页

作者：程绮玥杭州电力职业技术学院浙江杭州310015

结合移动通信的实际应用背景,在全面了解MPEG-4标准的基础上,对MPEG-4标准的核心部分——视频压缩编码器中最耗时的DCT模块和运动估计模块,进行了优化:对于DCT模块,采用了binDCT算法和部分DCT系数算法来优化;运动估计模块采用了npds算... 详细信息

结合移动通信的实际应用背景,在全面了解MPEG-4标准的基础上,对MPEG-4标准的核心部分——视频压缩编码器中最耗时的DCT模块和运动估计模块,进行了优化:对于DCT模块,采用了binDCT算法和部分DCT系数算法来优化;运动估计模块采用了npds算法来优化。通过理论分析和仿真可以看出,采用这三种算法,既保证了图像质量,又在很大程度上提高了编码速度。

关键词： MPEG-4标准运动估计 DCT binDCT SAD npds

THEORETICAL CONSIDERATIONS CON-CERNING POSTOPERATIVE AQUEOUS OUTFLOW AFTER GLAUCOMA SURGERY

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国际眼科杂志 2003年第1期3卷 80-80页

作者： K.E.Kotliar T.V.Kozlova I.M.Lanzl Department of Oph-thalmology Munich University of Technology GermanyFyodorov Eye Microsurgery State Institution RussiaDepartment of Oph-thalmology Munich University of Technology Germany

Purpose: Applying hydraulic principles to compare the postoperative situation in non-penetrating deep sclerectomy (npds) and trabeculectomy (TE) as well as to attempt to explain unanswered aspects of the postoperative outflow. Methods: A primary linear mathematical model based on fluid mechanics and clinical data was used to evaluate possible postoperative outflow pathways.

关键词：青光眼手术术后房水外流 npds TE

开角型青光眼中非穿透性深部巩膜切除术伴有或不伴有自体巩膜移植的中期结果

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世界核心医学期刊文摘（眼科学分册） 2006年第5期2卷 41-41页

作者： Devloo S. Deghislage C. Van Malderen L. 韩静 Department of Ophthalmology Middelheim Hospital Lindendreef 1 2020 Antwerp Belgium

Background: This study compares the medium-term success rate and complications of non-penetrating deep sclerectomy (npds) without and with autologous scleral implant in openangle glaucoma. Methods: Retrospective review of 93 eyes of 93 patients with medically uncontrolled open-angle glaucoma who underwent npds without (n=69, group 1) or with (n=24, group 2) autologous scleral implant. Results: The mean followupwas 16months (range 5-36) in group 1 and 15 months (range 4-28) in group 2. The mean intra-ocular pressures (IOP) preand postoperatively were, respectively, 23.8 and 16.1 mmHg in group 1, and 25.6 and 15.8 mmHg in group 2. The absolute success rate was 41%in group 1 and 54%in group 2. The qualitative success rate was 83%in group 1 and 75%in group 2. An IOP lower than 16.1 mmHg was obtained in 51%of patients in group 1 and 58%of patients in group 2. A Nd:YAGlaser goniopuncturewas performed in 30%of patients in group 1 and 50%of patients in group 2, and resulted in a better controlled IOP. Conclusions: npds without or with an autologous scleral implant is a safe procedure reducing the IOP significantly, but probably not sufficient when an IOP below 16 mmHg is required. We found no statistically significant difference between the two groups.

关键词：自体巩膜移植开角型青光眼巩膜切除术非穿透性中期深部回顾性调查药物治疗 npds 随访时间