您现在的位置: 首页> 研究主题> EBCOT

EBCOT

EBCOT的相关文献在2002年到2019年内共计77篇,主要集中在自动化技术、计算机技术、无线电电子学、电信技术、电影、电视艺术 等领域,其中期刊论文70篇、会议论文3篇、专利文献4篇;相关期刊52种,包括新疆教育学院学报、电子科技、集成电路应用等; 相关会议3种,包括第七届全国信号与信息处理联合会议暨首届全国省(市)级图象图形学会联合年会、全国计算机辅助教育学会第十一届学术会议、第九届全国青年通信学术会议等;EBCOT的相关文献由153位作者贡献,包括吴成柯、肖江、邓家先等。

EBCOT—发文量

期刊论文>

论文:70 占比:90.91%

会议论文>

论文:3 占比:3.90%

专利文献>

论文:4 占比:5.19%

总计:77篇

EBCOT—发文趋势图

EBCOT

-研究学者

  • 吴成柯
  • 肖江
  • 邓家先
  • 余敏
  • 华林
  • 周晓方
  • 徐向民
  • 朱珂
  • 李云松
  • 林争辉
  • 期刊论文
  • 会议论文
  • 专利文献

搜索

排序:

年份

    • 刘茂英
    • 摘要: 根据DCI规范,数字电影JPEG2000压缩编码采用了较为复杂的串行模式,在这种模式下,复杂度、串行度、冗余性较高的JPEG2000位平面编解码器的冗余性消减方法只能采用跳过方法。本文研究、验证并分析了现有基于列或列群的跳过方法,指出其存在的主要问题:1)sig通道全扫描,未消减 sig 通道的冗余列;2)列群组合扫描判断效率低。针对这两个问题,在现有跳过方法的基础上,创新地提出了5个方法:1)cln通道预判下一位平面各通道每列的跳过或处理状态;2)sig通道单列永久跳过完全属于 ref通道的列;3)sig 通道临时跳过完全属于 cln通道的列;4)单列状态自适应、动态地进行列群组合;5)各通道依据动态列群组合进行编解码的跳过或处理。实验表明,本文提出的基于列群的综合方案,优化后比特总扫描次数降低到优化前比特总扫描次数的51%~55%,对冗余比特扫描的优化效率达到了78%~82%,对于列群的判断次数仅为总列数的10.9%~12.76%,能够显著提升位平面扫描效率。
    • 黄胜; 翦伟; 韩亮
    • 摘要: 针对EBCOT嵌入式编码中码率控制部分计算复杂度高的问题,提出一种基于加权控制的码率预分配反馈算法。首先对原图像进行小波分解,然后根据子带的重要性权值对目标码率进行初步分配,并以视觉系数加权或比特平面深度加权进一步优化子带码率的分配。在同一子带内按照各码块的重要性权值进行排序,优先处理更重要的码块,最后采用码率反馈来控制编码精度。实验结果证明该算法码率预分配准确,编码器的计算量小,相对于RPFC算法,计算量减少率提高了10%,且算法的码率分配效率提高了50%以上;同时算法在低码率时重建图像峰值信噪比较PCRD算法提高了0.7 dB以上。%To resolve the problem that a large amount of data appeared in the rate control of EBCOT,this paper proposed a novel rate pre-allocation and feedback algorithm based on weighted control.First,it decomposed the original image by wave-let,then initially allocated the target rate according to the significant weight of subbands,and further optimized it by the visual coefficient or the depth of bit plane.It sorted each code block in the same subband according to the significant weight,a code block with large weight was priority and it controlled the coding accuracy by rate feedback.Experimental results prove that the proposed algorithm can pre-allocate bit rate accurately and reduce the calculation of encoder,increase the reduction rate of calculation 10%and the rate allocation efficiency more than 50%compared with RPFC algorithm.The algorithm can improve the peak signal to noise ratio of the reconstructed image 0.7 dB relative to the PCRD algorithm at low bit-rate.
    • 曾晋; 吕韬
    • 摘要: 在JPEG2000编码系统的设计与实现过程中,EBOCOT的编码速度成为了整个系统设计的关键;为了有效的提高编码的效率,本文提出了一种基于零系数检测的通道并行算法,该算法利用小波子带变换后的特点,增加了对零码块和零条带的检测,减少了冗余扫描,并且实现多通道并行编码加快了编码速度。%In the design and implementation process of JPEG2000 coding system, EBOCOT encoding speed has become the key to the whole system design; in order to effectively improve the coding efifciency, this paper proposes a channel parallel algorithm based on zero coefifcients .This algorithm uses wavelet sub-after transformation with the characteristics, the detection of a zero increaseand zero code block strip, reducing redundant scanning and multi-channel parallel coded accelerate the encoding speed.
    • 刘春香; 郭永飞; 李宁; 司国良
    • 摘要: In order to solve the problem of imaging system instability caused by high work frequency of image composing circuit on the satellite, the camera' s structure was improved, a composing and compression method of TDICCD based on FPGA platform for satellite remote sensing images was proposed. First, the principle of real-time composing and compression for multi-channel satellite remote sensing image was introduced. Then, based on TDICCD linear array push-broom imaging mode characteristics, line-based 2D-DWT integer lifting scheme was used. EBCOT of bit-plane and coding parallel structure was proposed. Composing and compression of image data was simultaneously achieved. At last, experiment platform for the validation was established. Experimental results indicate that the system clock reduce to 80 MHz and 64 MHz respectively from the original 100 MHz in the lossless and 2 times compression. Reconstruct image's PSNR is 84 dB that is bigger than 80 dB. The average processing time of one line image is 61.2μs that is smaller than camera's smallest line period. The proposed algorithm is stable and reliable. It achieves the composing and compression within camera, it satisfy engineering requirements.%为了解决星上图像整合电路工作频率过高而造成的成像系统工作不稳定的问题,在相机的结构上进行创新,提出了一种基于FPGA平台实现的星上TDICCD遥感图像实时合成压缩方法。首先,介绍了星上多通道遥感图像实时合成压缩的原理;然后,针对TDICCD线阵推扫成像模式的特点,采用基于行的2D-DWT整型提升算法,提出了比特平面和编码过程全并行的EBCOT结构,实现了在对图像数据进行整合的同时进行图像的近无损压缩;最后,搭建试验平台进行验证,结果表明,在无损压缩和2倍压缩时,系统主时钟从原来的100 MHz分别降低为80 MHz和64 MHz,系统稳定,恢复图像的PSNR可以达到84 dB,满足大于80 dB的成像质量要求。处理每行的平均时间61.2μs小于相机的最小行周期63μs。算法稳定可靠,实时性好,实现了相机内部的合成压缩,满足实际工程需求。
    • 安然; 王浩全; 张秀林; 刘玉
    • 摘要: EBCOT编码是一种十分高效的小波系数编码方法,其作为JPEG2000压缩标准的核心思想,与SPIHT、EZW等编码方法相比既有相同之处,又有独到之面,它汲取了多年来图像编码算法发展中的精华部分,因此拥有非常显著的性能.论文论述了EBCOT编码的基本原理,对编码算法的不足之处进行了深入分析,在此基础上通过对小波系数的研究,提出了基于编码块的并行优化方案,并以实验结果证明其在图像压缩中的卓越表现.
    • 张冷; 卢亮; 张婷
    • 摘要: 以遥感图像的压缩问题为研究对象,剖析JPEG2000压缩的技术流程,分析遥感图像、自然图像和人物图像的图像特征,并提出一种基于常规JPEG2000压缩框架的面向遥感图像的高效压缩显示一体优化算法,包括高频分量滤波处理、位平面编码通道扫描并行处理和改进的感兴趣区域ROI编码算法,在图像压缩整体耗时和ROI的渐进显示效果上都有明显的提升.
    • 鄢涛; 杜小丹; 赵卫东; 刘永红
    • 摘要: 文章介绍一种微型箭载固态图像记录装置,包括该固态记录装置的硬件平台设计、实现及软件平台的构建;其中主处理器系统采用TMS320DM642来实现图像的采集、压缩、存储、传输的主控部分,硬件部分主要介绍了图像采集模块和外部扩展存储器模块;而在图像压缩部分采用JPEG2000作为编码器的核心算法,并对此算法提出了一些改进;该系统具有可移植性和可扩展性,可以广泛应用于航天事业各个有关图像处理的领域.%The text introduced a solid - state image recording minidevice including hardware platform and software platform. By TMS320DM642 according to the due function of recorder such as image gathering, compression, storage, transmission, built the hardware platform, and designed the hardware circuit according to the function, including image gathering module, external expanding memory module. The text chooses JPEG2000 as our priority research object; and also we improve and optimize the block, it is possible to use the recorder in the corresponding domain of space cause each to the image processing for its strong transplantation and expansibility.
    • 柳薇; 陈冬丽
    • 摘要: Multiwavelet extends traditional scalar wavelet to vector space, and includes all the advantages of the traditional wavelet. Multiwavelet shows the perfect union of symmetry, orthogonally, finitely support and smoothness. As a result, the applications of multiwavelet in image processing have shown great potential. An image coding method of image coding based on EBCOT algorithm and multiwavelet transform was proposed. In this research, a variety of commonly-used multiwavelet bases were used to combine EBCOT algorithm. The experimental result shows that the proposed method is a valuable attempt of image compression.%多小波是小波理论的新分支,将传统的单小波拓展到矢量空间.多小波既包括了传统小波的全部优点,同时又克服了单小波的缺陷,将实际应用中十分重要的正交性、对称性、紧支性、光滑性完美地结合在一起,因此多小波在图像处理方面的应用也显示出巨大的潜力.该文在研究了JPEG2000的核心编码技术——EB-COT算法和多小波变换原理的基础上,提出了结合EBCOT算法的多小波图像编码.算法将各种常用的多小波基,结合EBCOT算法,对灰度图像进行压缩编码.实验结果证明基于EBCOT算法的多小波图像编码方法能够对图像进行很好的压缩.
    • 文家福; 王嘉祯; 刘爱珍; 李占德
    • 摘要: 针对JPEG2000图像压缩标准所具有的渐进传输、一次编码多次解码等特性,提出了一种基于图像特征的鲁棒性图像认证算法.该算法在JPEG2000编码过程中,先根据图像不变特征,生成认证水印,再根据实际的鲁棒性认证需求,在量化后的小波系数中确定每个子带的认证水印嵌入位平面,最后基于小波系数位平面的特征嵌入认证水印.算法不仅能适应JPEG2000各种灵活的编码方式,还能定位图像篡改的位置.实验结果验证了图像认证算法对可允许图像操作的鲁棒性以及对图像篡改的敏感性.
  • 查看更多

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号