多视点视频编码预测结构的研究

不同的多视点视频序列具有不同的时空相关性,MVC采用的分层B帧预测结构无法充分利用视频序列的属性。本文提出了一种能适应不同视频序列编码的方法,通过研究多视点视频图像中的时空相关性和视点间的相关性,适当地取消部分时间层的视点间预测并且对所有P视点的非关键帧均采用视点间预测和调整了I视点的位置。实验结果表明,本文方法在提高编码效率的同时使得预测结构具有更好的随机访问性能、更低的编码复杂度。     

一种适合网络传输的JPEG2000图像容错编码方法

最新的静止图像压缩编码标准JPEG2000,提供了许多容错工具,这些容错工具的基本思想是＂有错误,但我让它局限在尽量小的范围,并跳过它们＂,在误码率较低的通信信道中,这些容错工具能提供良好的容错性能。然而,在像无线信道这种误码率较高且易丢包的通信信道中,解码器就要跳过相当多的数据,不能得到好的重建图像。本文利用经过小波变换的子带间存在较大的空间相关性,提出了一种相关子带间错误补偿技术。实验结果表明,此技术能很好地提高JPEG2000图像在无线信道传输中的鲁棒性。     

Frame-layer bit allocation for multi-view video coding based on frame complexity estimation

Current multi-view video coding （MVC） reference model in joint video team （JVT） does not provide efficient rate control schemes. This paper presents a rate control algorithm for MVC by improving the quadratic rate-distortion （R-D） model. We reasonably allocate bit-rate among views based on the correlation analysisl The proposed algorithm consists of three levels to control the rate bits more accurately, of which the frame layer allocates bits according to the frame complexity and the temporal activity. Extensive experiments show that the proposed algorithm can control the bit rate efficiently.     

Local curve fitting based Lagrange multiplier selection for Id-slice in multi-view video coding

The rate and distortion of Id-slice do not fit the globally linear relationship on a logarithmic scale. Lagrange multiplier selection methods based on the globally linear approximate relationship are neither efficient nor optimal for multi-view video coding (MVC). To improve the coding efficiency of MVC, a local curve fitting based Lagrange multiplier selection method is proposed in this paper, where Lagrange multipliers are selected according to the local slopes of the approximate curves. Experimental results showed that the proposed method improves the coding efficiency. Up to 2.5 dB gain was achieved at low bitrates.     

Combined Signal Detection Method in Differential Frequency Hopping System

Differential frequencyhopping(DFH) as a digital radiotechnology has satisfyingfeatures of multipathfading mitiga-tion,spectral re-use ,non-interferingspreadspectrumoper-ation,andinterferenceresistance[1].Sincetheintroductionof controllable redundancy into…     

Local curve fitting based Lagrange multiplier selection for Id-slice in multi-view video coding

The rate and distortion of Id-slice do not fit the globally linear relationship on a logarithmic scale. Lagrange multiplier selection methods based on the globally linear approximate relationship are neither efficient nor optimal for multi-view video coding （MVC）. To improve the coding efficiency of MVC, a local curve fitting based Lagrange multiplier selection method is proposed in this paper, where Lagrange multipliers are selected according to the local slopes of the approximate curves. Experimental results showed that the proposed method improves the coding efficiency. Up to 2.5 dB gain was achieved at low bitrates.     

Highly parallel implementation of sub-pixel interpolation for AVS HDTV decoder

In this paper, we propose an effective VLS1 architecture of sub-pixel interpolation for motion compensation in the AVS HDTV decoder. To utilize the similar arithmetical operations of 15 luma sub-pixel positions, three types of interpolation filters are proposed. A simplified multiplier is presented due to the limited range of input in the chroma interpolation process. To improve the processing throughput, a parallel and pipelined computing architecture is adopted. The simulation results show that the proposed hardware implementation can satisfy the real-time constraint for the AVS HDTV （1 920× 1 088） 30 fps decoder by operating at 108 MHz with 38.18k logic gates. Meanwhile, it costs only 216 cycles to accomplish one macroblock, which means the B frame sub-pixel interpolation can be realized by using only one set of the proposed architecture under real-time constraints.     

YCbCr色彩空间的彩色图像光线补偿方法研究

在进行人脸检测过程中,自然光源光照条件和取景设备对图像原本色彩存在干扰影响,这样很难满足人脸识别系统的要求。从图像进行光照补偿处理的方法和效果的研究出发,实验证明:在图像背景相当简单的情况下,采用参考白光线补偿方法可以很好地对色温差图像进行光照补偿处理,消除了光照的影响力,使后续的处理更适合进行人脸识别性能。     

Adaptive early termination of fast mode decision in MVC based on inter-view correlation

Variable size motion estimation (ME) and disparity estimation (DE) are employed to select the best coding mode for each macroblock (MB) in the current joint multiview video model (JMVM).This technique achieves the highest possible coding efficiency,but it results in extremely large computation complexity which obstructs the multiview video coding (MVC) from practical application.This paper proposes an adaptive early termination of fast mode decision algorithm for MVC.It makes use of the coding information o...     

Relighting multiple color textures

INTRODUCTION When constructing complete 3D models, multi- ple color texture maps are often necessary. Suppose that the object of interest is fixed and images of it are acquired by one or more cameras from different po- sitions and directions. The viewpoints and the illu- mination may be different for each acquisition. The geometric model of the object may come from merging of several 3D models. The 2D-3D registra-tion between the textures and the geometric model is done by a previous st…     

数字化学习资源画面色彩表征影响学习注意的研究

在学习过程中,学习注意是保证学习者对知识信息进一步记忆与深入思考、学习真正发生的重要前提。当前的研究仍有在数字化学习资源画面设计中,对学习注意这一重要影响因素重视不足的问题。数字化学习资源画面色彩表征影响学习注意的“关系模型”,以及促进有效学习注意形成的色彩表征设计的“操作模型”,就是针对这一问题而提出的。“关系模型”提出了数字化学习资源画面色彩表征知识内容形态影响选择性学习注意,色彩表征知识关系形态影响持续性学习注意,色彩表征知识目标形态影响分配性学习注意等观点,并从中推衍出学习注意的“自动加工→序列加工→精细加工”的过程。“操作模型”从促进有效学习注意形成、优化数字化学习资源画面设计的研究视角,提出了“色彩编码设计形式”“色彩线索设计形式”和“色彩信号设计形式”等三种色彩表征设计形式,并通过对色彩表征设计流程的系统梳理,推导出“学习注意类型分析、色彩表征设计形式分析、色彩表征语义设计、色彩表征语用设计、色彩表征语构设计”的设计流程。对数字化学习资源画面的色彩表征设计,影响着学习注意的定位策略、匹配策略和管控策略,这为提升数字化学习效果提供了新思路。     

显微镜中假彩色编码方法探讨

将假彩色编码应用到显微镜中,能够从显微镜视场里直接观察到图片的假彩色图像,这就为肉眼识别标本的更多细节提供了条件.     

基于视频压缩编码的动态图像水印方案

提出了一种新的基于视频压缩编码的动态图像水印方案。在嵌入水印时,充分考虑动态图像压缩编码的特性,对帧内编码帧(I帧),将水印信息嵌入到DCT低频系数中;而对帧间编码帧(P,B帧),结合动态补偿/离散余弦变换(MC/DCT)混介编码,把水印信息嵌入到运动补偿后的残差图像的自流成分中。同时,在水印嵌入时,采用扩频技术与多维水印相结合的方法,并通过相关检测的方法判断水印的存在。由于水印的检测是对视频码流直接实施的,不需要对压缩数据进行完全解码,从而大大降低了计算量,提高了视频数据水印的适用性。     

Analysis and application of error concealment tools in AVS-M decoder

Audio Video coding Standard (AVS) is the latest audio and video coding standard of China. AVS Part 7 (also known as A VS-M) targets mobility applications where error concealment is of great importance. This paper first briefly introduces the general concept of error concealment. Then two error concealment schemes are proposed and implemented on AVS-M decoder under different test conditions. Simulation results of the schemes and suggestions on how to use these tools are also provided.     

基于肤色HSV彩色模型下的人脸检测

每一种人种皮肤彩色分布在一个较窄的频带上。一般所用的RGB彩色模型对光线的亮暗程度比较敏感,而在HSV彩色模型中,色相H分量表示了图像的彩色信息,受到光线变化的影响缓慢。鉴于此,采用在HSV彩色模型下建立肤色模型,并对其进行训练,从而用训练后的模型对图像进行人脸检测。实验结果表明,提出的方法是有效而快速的。     

融合高斯混合模型和prewitt算子的运动目标检测

提出一种融合高斯混合模型和prewitt算子的运动目标检测算法.通过高斯混合模型拟合背景信息,利用prewitt算子提取图像的边缘特征信息,将两者融合起来.边缘信息反映了局部区域内容的结构信息,可作为颜色信息的补偿;模型保证了在线更新背景信息时的稳定性和收敛性,同时弥补了目标分割中颜色信息接近时容易导致误判的不足.实验结果表明,与一般高斯混合模型比较,本方法具有较高的分割精度,提高了目标检测的鲁棒性.     

基于JND和AR模型的感知视频编码方法(英文)

为了达到减少比特数同时保持画面质量的目的,提出了一种基于最小可视失真(JND)和自回归(AR)模型的感知视频编码方法.首先,设计了基于JND的纹理分割算法,建立了空时JND模型,以MB为基本单元,通过计算其JND能量并与阈值做比较,用以分割出视频序列中的纹理区域.然后,开发了AR模型来合成纹理区,在使用最小二乘法计算出AR模型的参数后,用相邻的前后参考帧对应像素的线性插值来生成重构像素.最后,为了检验所提方法的效果,将其与H.264/AVC视频编码系统做比较,用不同的视频序列实验来验证所提方法的有效性.实验结果显示,对于具有不同纹理特点的实验序列,所提方法可以在保持感知质量的同时将比特率减少15%～58%.     

热敏液晶聚合物彩色图像显示器

本文描述了热敏液晶聚合物彩色图像的形成方式.液晶聚合物能可逆地呈现透明与不透明光学状态,并使包含至少两种颜色的象素显示区域形成一个平面.显示器彩色区域内与彩色对应的象素可被选择,颜色的频谱传输中心位于被显示的各种颜色中,并紧靠最长的波长.提供热量给被选中的象素时,它的最大不清晰度比其它颜色对应象素的不清晰度大.     

基于动态预测的有源电力滤波器选择性谐波补偿方法

提出一种基于参考电流动态预测的选择性补偿方法。通过滑窗迭代DFT法提取与参考电流相关的特定次谐波;把动态预测算法植入补偿电流控制环节,预测下一拍的指令电流信号,并引入误差修正器提高预测精度,在此基础上计算逆变器的参考电压矢量;利用空间矢量脉宽调制法获得PWM信号,驱动三相变流器从而输出三相电压,实现选择性补偿。仿真和实验证明了该方法的正确性和可行性。     

J2EE在设备管理信息系统中的开发与应用

本文在研究设备管理应用软件开发过程的基础上，提出了基于J2EE的应用软件架构。在中间层上采用基于模型视图控制器(MVC．Model-View-Controller)的设计模式来缓解现行B／S结构中Web服务器负担过重的压力，并举例说明MVC模式在设备管理信息系统具体设计过程中的有效性。