查询词典 codebook

A new method for updating the codebook is proposed to improve the accuracy of the adaptive backward codebook.

为了提高自适应后向码本的精度，提出了一种码本更新的新算法。

The main work of this dissertation is that after the conventional codebook design algorithm is used to decrease the expected distortion, evolutionary algorithm is introduced into vector quantization based on the partial distortion theorem to design the optimal codebook.

本论文的主要工作正是在利用传统码本设计算法减少平均误差的前提下，根据矢量量化的部分失真定理，引入进化算法，设计出较优的码本。

An integral projection algorithm for Vector Quantization is proposed in this paper,integral projection is used in every 4×4 block firstly,and then carry on vector quantity with the integral codebook.The memory area of codebook and computation of encode can be reduced greatly while the quality of the picture only loses slightly.

提出了一种积分投影和矢量量化相结合的图像压缩算法，将图像的每一个4×4分块先进行积分投影，然后再与积分投影后的码书进行量化匹配，大大减少运算量和码书存储面积，而图像的质量只有轻微损失。

The algorithms based on two necessary condition is monotone decreasing, for multi-extreme point in solution space, the distribution of final codebook seriously depend on that of initial codebook, it is difficult to cast off if get in local optimality.

然而这些算法本身属单调梯度下降算法，在解空间存在多极值点时，最终码书的分布较大依赖初始码书分布，一旦落入局部最优区域，很难摆脱。

The LP analysis is used again on residual signal to reconstruct the spectrum fine structure.Results Adaptive codebook delay and two codebook gains are tied to build pitch/energy contour feature.

结果该方法通过对残差信号进行线性预测分析，提高了谱包络的精确程度，并从码本增益和延时参数中得到了基音/能量轨迹特征。

The non-uniform algebraic codebook is determined by the non-uniform statistical properties of the algebraic codebook, and the part-searching-area is determined by the periodicity of the algebraic codebook excitation vector, which makes up the insufficient numbers of signed pulses in algebraic codebook at low bit rate.

非均匀代数码书由代数码书的脉冲非均匀统计特性确定，部分搜索域代数码书则由代数码书矢量的周期性确定，该方法有效地弥补了低比特率情况下代数码书中脉冲数不足的缺点。

Theoretical analysis and experimental results suggest that its coding accuracy based on a N-sized codebook is comparable with that of the conventional vector quantization with a N〓-sized codebook, and much better than multi-stage VQ based on two N-sized codebooks, whereas its computational complexity is much lower than the latter ones.

理论分析和实验结果表明：码书大小为N的线上投影法的编码精度与码书大小为N〓的矢量量化法相当，并且明显优于用两个大小为N的码书构成的两级矢量量化法，而其码书生成和编码的计算复杂度远低于后者。

An algorithm how to compress codebook by rotating codewords is also proposed and verified in this paper,a codebook can be compressed from 1 024×16×8 bit to 256×16×8 bit using this algorithm.

同时给出了一种将现有1 024阶16维码书旋转压缩成256阶16维的方法，并对该方法得到的码书性能进行了仿真验证。

Second, codewords in the initialization codebook are selected to construct background codebook based on the assumptions about the background model.

实验结果表明，即使背景本身存在运动和光照条件发生变化，该方法构造的背景也能有效检测运动目标。

The processing unit of the architecture is independent of the codebook size that has an effect on encoded image quality, and can easily be extended to an arbitrary number of codewords without increasing extra hardware for computing, which is superior in enlarging codebook size to improve reconstructed image quality.

其次，研究了矢量量化快速编码算法的VLSI体系结构，该结构的运算处理单元与影响编码质量的码书尺寸无关，很容易扩展到任意数目的码字而不增加额外的运算硬件，在改善编码质量增加码书大小方面具有一定的优越性。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。