共查询到20条相似文献,搜索用时 78 毫秒
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在TMS320DM643平台上实现H.264基档次编码器的移植与优化显得格外实用和必要。基于对DSP平台的结构特性和H.264的计算复杂度分析,主要从核心算法、数据传输和存储器/Cache使用几方面对H.264编码器进行了优化。实验结果表明,对于C IF格式的视频序列,优化后的H.264编码器能够达到每秒高于24帧的编码速度,满足了视频处理对于实时性的要求。 相似文献
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基于H.264的无再损帧内编码 总被引:1,自引:0,他引:1
为了在改进的H.264上实现无再损帧内编码,该文提出了一种新的基于整数线性规划的优化clip算法及改进算法,解决了H.264多次编码中由当前clip模块和帧内预测运算引入的视频畸变问题,并且改进了现有帧内预测算法的代价函数以确保多次编码时后续编码器预测值与前次编码器预测值一致。实验结果显示,与现有帧内编码算法比较,基于整数线性规划理论的帧内编码算法完全消除了现有算法导致的多次编码时的图像降质现象,在改进的H.264编解码算法中实现了严格视频无再损编码。 相似文献
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H.264中帧内编码算法及其快速实现研究 总被引:2,自引:0,他引:2
新的视频编码标准H.264使用了帧内预测的编码方式,这与以往的视频编码标准相比在很大程度上提高了帧内编码效率,节省了码流,但同时也增加了编码器的复杂度,因此有必要对H.264帧内编码算法进行快速实现,以满足实时视频通信的要求.首先详细介绍H.264帧内编码的实现过程,然后使用SIMD(单指令多数据流)技术对帧内编码进行快速实现.实验结果表明,与未使用快速算法相比,使用该快速实现算法后,H.264帧内编码速度得到显著提高. 相似文献
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一种H.264视频流自适应率失真优化编码算法 总被引:1,自引:0,他引:1
为了提高编码视频流在丢包网络环境中的抗误码性能,目前比较常用的是采用帧内刷新算法.在率失真框架之内的帧内优化编码刷新算法,则被认为是更为直接和有效的解决办法.在视频编码标准H.264/JVT中采用的就是这种算法.然而由于没有考虑到信道丢包率对编码器端进行仿真解码次数的影响,从而导致在进行率失真优化编码时的计算量较大,编码耗时较长,严重影响了编码器的编码效率.基于以上分析,提出了一种改进的自适应率失真优化编码算法.将H.264标准率失真优化编码算法中计算解码器端视频帧期望失真度的代数平均值算法,改进为加权平均值算法.仿真实验表明,提出的算法可根据信道丢包率和模拟信道状态个数信息来自适应地决定编码器端进行仿真解码计算的次数,从而有效降低H.264标准率失真优化编码算法中的计算冗余和计算复杂度,节省编码耗时.在模拟信道状态个数默认为30个时,本算法最多可节省近55%的编码耗时. 相似文献
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从实时应用角度出发,参考H.263编码标准,对H.264视频编码器进行精简,并对耗时较大的算法进行改进.仿真结果表明,简化后的H.264编码器编码速度达到20f/s(帧/秒),达到实时编码要求,且编码性能优于H.263编码标准的编码器. 相似文献
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Michael Reilly 《半导体技术》2004,29(12)
DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system. 相似文献
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Thomas M.Trexler 《半导体技术》2004,29(5)
From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test. 相似文献
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The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high. 相似文献
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The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation. 相似文献
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Today, micro-system technology and the development of new MEMS (Micro-Electro-Mechanical Systems) are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible. 相似文献
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Qi-jiang Ran Pei-de Han Yu-jun Quan Li-peng Gao Fan-ping Zeng Chun-hua Zhao 《光电子快报》2008,4(4):239-242
This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel's. 相似文献
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It is well known that adding more antennas at the transmitter or at the receiver may offer larger channel capacity in the multiple-input multiple-output(MIMO) communication systems. In this letter, a simple proof is presented for the fact that the channel capacity increases with an increase in the number of receiving antennas. The proof is based on the famous capacity formula of Foschini and Gans with matrix theory. 相似文献
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Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers
A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it. 相似文献
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A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working. 相似文献
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《中国通信》2014,(7)
正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks 相似文献