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Digital Restoration of Historical Buildings by Integrating 3D PC Reconstruction and GAN Algorithm
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作者 Tianke Fang Zhenxing Hui +3 位作者 William P.Rey Aihua Yang Bin Liu Zhiying Xie 《Journal of Artificial Intelligence and Technology》 2024年第2期179-187,共9页
Historical architecture is an important carrier of cultural and historical heritage in a country and region,and its protection and restoration work plays a crucial role in the inheritance of cultural heritage.However,... Historical architecture is an important carrier of cultural and historical heritage in a country and region,and its protection and restoration work plays a crucial role in the inheritance of cultural heritage.However,the damage and destruction of buildings urgently need to be repaired due to the ancient age of historical buildings and the influence of natural environment and human factors.Therefore,an artificial intelligence repair technology based on three-dimensional(3D)point cloud(PC)reconstruction and generative adversarial networks(GANs)was proposed to improve the precision and efficiency of repair work.First,in-depth research on the principles and algorithms of 3D PC data processing and GANs should be conducted.Second,a digital restoration frameworkwas constructed by combining these two artificial intelligence technologies to achieve precise and efficient restoration of historical buildings through continuous adversarial learning processes.The experimental results showed that the errors in the restoration of palace buildings,defense walls,pagodas,altars,temples,and mausoleums were 0.17,0.12,0.13,0.11,and 0.09,respectively.The technique can significantly reduce the error while maintaining the high-precision repair effect.This technology with artificial intelligence as the core has excellent accuracy and stability in the digital restoration.It provides a new technical means for the digital restoration of historical buildings and has important practical significance for the protection of cultural heritage. 展开更多
关键词 3d PC reconstruction artificial intelligence repair GAN algorithm stereoscopic vision historical buildings
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The parallel 3D magnetotelluric forward modeling algorithm 被引量:28
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作者 Tan Handong Tong Tuo Lin Changhong 《Applied Geophysics》 SCIE CSCD 2006年第4期197-202,共6页
The workload of the 3D magnetotelluric forward modeling algorithm is so large that the traditional serial algorithm costs an extremely large compute time. However, the 3D forward modeling algorithm can process the dat... The workload of the 3D magnetotelluric forward modeling algorithm is so large that the traditional serial algorithm costs an extremely large compute time. However, the 3D forward modeling algorithm can process the data in the frequency domain, which is very suitable for parallel computation. With the advantage of MPI and based on an analysis of the flow of the 3D magnetotelluric serial forward algorithm, we suggest the idea of parallel computation and apply it. Three theoretical models are tested and the execution efficiency is compared in different situations. The results indicate that the parallel 3D forward modeling computation is correct and the efficiency is greatly improved. This method is suitable for large size geophysical computations. 展开更多
关键词 Magnetotelluric 3d forward modeling MPI parallel programming design 3d staggered-grid finite difference method parallel algorithm.
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Optimization algorithm for rapid 3D gravity inversion 被引量:2
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作者 Jing Lei Yao Chang-Li +3 位作者 Yang Ya-Bin Xu Meng-Long Zhang Guang-Zhi Ji Ruo-Ye 《Applied Geophysics》 SCIE CSCD 2019年第4期507-518,561,共13页
The practical application of 3D inversion of gravity data requires a lot of computation time and storage space.To solve this problem,we present an integrated optimization algorithm with the following components:(1)tar... The practical application of 3D inversion of gravity data requires a lot of computation time and storage space.To solve this problem,we present an integrated optimization algorithm with the following components:(1)targeting high accuracy in the space domain and fast computation in the wavenumber domain,we design a fast 3D forward algorithm with high precision;and(2)taking advantage of the symmetry of the inversion matrix,the main calculation in gravity conjugate gradient inversion is decomposed into two forward calculations,thus optimizing the computational efficiency of 3D gravity inversion.We verify the calculation accuracy and efficiency of the optimization algorithm by testing various grid-number models through numerical simulation experiments. 展开更多
关键词 GRAVITY 3d inversion optimization algorithm high efficiency massive data
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Three-dimensional(3D)parametric measurements of individual gravels in the Gobi region using point cloud technique
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作者 JING Xiangyu HUANG Weiyi KAN Jiangming 《Journal of Arid Land》 SCIE CSCD 2024年第4期500-517,共18页
Gobi spans a large area of China,surpassing the combined expanse of mobile dunes and semi-fixed dunes.Its presence significantly influences the movement of sand and dust.However,the complex origins and diverse materia... Gobi spans a large area of China,surpassing the combined expanse of mobile dunes and semi-fixed dunes.Its presence significantly influences the movement of sand and dust.However,the complex origins and diverse materials constituting the Gobi result in notable differences in saltation processes across various Gobi surfaces.It is challenging to describe these processes according to a uniform morphology.Therefore,it becomes imperative to articulate surface characteristics through parameters such as the three-dimensional(3D)size and shape of gravel.Collecting morphology information for Gobi gravels is essential for studying its genesis and sand saltation.To enhance the efficiency and information yield of gravel parameter measurements,this study conducted field experiments in the Gobi region across Dunhuang City,Guazhou County,and Yumen City(administrated by Jiuquan City),Gansu Province,China in March 2023.A research framework and methodology for measuring 3D parameters of gravel using point cloud were developed,alongside improved calculation formulas for 3D parameters including gravel grain size,volume,flatness,roundness,sphericity,and equivalent grain size.Leveraging multi-view geometry technology for 3D reconstruction allowed for establishing an optimal data acquisition scheme characterized by high point cloud reconstruction efficiency and clear quality.Additionally,the proposed methodology incorporated point cloud clustering,segmentation,and filtering techniques to isolate individual gravel point clouds.Advanced point cloud algorithms,including the Oriented Bounding Box(OBB),point cloud slicing method,and point cloud triangulation,were then deployed to calculate the 3D parameters of individual gravels.These systematic processes allow precise and detailed characterization of individual gravels.For gravel grain size and volume,the correlation coefficients between point cloud and manual measurements all exceeded 0.9000,confirming the feasibility of the proposed methodology for measuring 3D parameters of individual gravels.The proposed workflow yields accurate calculations of relevant parameters for Gobi gravels,providing essential data support for subsequent studies on Gobi environments. 展开更多
关键词 Gobi gravels three-dimensional(3d)parameters point cloud 3d reconstruction Random Sample Consensus(RANSAC)algorithm density-Based Spatial Clustering of Applications with Noise(dBSCAN)
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Quasi-3D Numerical Simulation of Tidal Hydrodynamic Field 被引量:1
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作者 宋志尧 薛鸿超 +2 位作者 严以新 茅丽华 徐福敏 《China Ocean Engineering》 SCIE EI 1999年第3期265-276,共12页
Based on the 2D horizontal plane numerical model, a quasi-3D numerical model is established for coastal regions of shallow water. The characteristics of this model are that the velocity profiles;can be obtained at the... Based on the 2D horizontal plane numerical model, a quasi-3D numerical model is established for coastal regions of shallow water. The characteristics of this model are that the velocity profiles;can be obtained at the same time when the equations of the value of difference between the horizontal current velocity and its depth-averaged velocity in the vertical direction are solved and the results obtained are consistent with the results of the 2D, model. The circulating flow in the rectangular area induced by wind is simulated and applied to the tidal flow field of the radial sandbanks in the South Yellow Sea. The computational results from this quasi-3D model are in good agreement with analytical results and observed data. The solution of the finite difference equations has been found to be stable, and the model is simple, effective and practical. 展开更多
关键词 tidal hydrodynamic field quasi-3d numerical model 2d numerical model velocity profile numerical simulation
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Polarization sensitive photodetector based on quasi-1D ZrSe_(3) 被引量:1
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作者 Xingang Wang Tao Xiong +5 位作者 Kaiyao Xin Juehan Yang Yueyang Liu Zeping Zhao Jianguo Liu and Zhongming Wei 《Journal of Semiconductors》 EI CAS CSCD 2022年第10期39-49,共11页
The in-plane anisotropy of transition metal trichalcogenides(MX_(3))has a significant impact on the molding of materi-als and MX_(3) is a perfect choice for polarized photodetectors.In this study,the crystal structure... The in-plane anisotropy of transition metal trichalcogenides(MX_(3))has a significant impact on the molding of materi-als and MX_(3) is a perfect choice for polarized photodetectors.In this study,the crystal structure,optical and optoelectronic aniso-tropy of one kind of quasi-one-dimensional(1D)semiconductors,ZrSe_(3),are systematically investigated through experiments and theoretical studies.The ZrSe_(3)-based photodetector shows impressive wide spectral response from ultraviolet(UV)to near in-frared(NIR)and exhibits great optoelectrical properties with photoresponsivity of 11.9 mA·W^(-1) and detectivity of~106 at 532 nm.Moreover,the dichroic ratio of ZrSe_(3)-based polarized photodetector is around 1.1 at 808 nm.This study suggests that ZrSe_(3) has potential in optoelectronic applications and polarization detectors. 展开更多
关键词 quasi-1d ZrSe_(3) polarization-sensitive
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Using MC Algorithm to Implement 3D Image Reconstruction for Yunnan Weather Radar Data 被引量:2
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作者 Zhongneng Liu Zhenzhong Shi +4 位作者 Murong Jiang Jie Zhang Liqing Chen Tian Zhang Gongqin Liu 《Journal of Computer and Communications》 2017年第5期50-61,共12页
3D image reconstruction for weather radar data can not only help the weatherman to improve the forecast efficiency and accuracy, but also help people to understand the weather conditions easily and quickly. Marching C... 3D image reconstruction for weather radar data can not only help the weatherman to improve the forecast efficiency and accuracy, but also help people to understand the weather conditions easily and quickly. Marching Cubes (MC) algorithm in the surface rendering has more excellent applicability in 3D reconstruction for the slice images;it may shorten the time to find and calculate the isosurface from raw volume data, reflect the shape structure more accurately. In this paper, we discuss a method to reconstruct the 3D weather cloud image by using the proposed Cube Weighting Interpolation (CWI) and MC algorithm. Firstly, we detail the steps of CWI, apply it to project the raw radar data into the cubes and obtain the equally spaced cloud slice images, then employ MC algorithm to draw the isosurface. Some experiments show that our method has a good effect and simple operation, which may provide an intuitive and effective reference for realizing the 3D surface reconstruction and meteorological image stereo visualization. 展开更多
关键词 WEATHER RAdAR data 3d Reconstruction MC algorithm CUBE Weighting INTERPOLATION
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An improved 3D shape haptic rendering algorithm for finger mounted vibrotactile device 被引量:1
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作者 Wu Juan Han Xiao Yang Huaining 《Journal of Southeast University(English Edition)》 EI CAS 2018年第3期317-322,共6页
To improve the sense of reality on perception, an improved algorithm of 3D shape haptic rendering is put forward based on a finger mounted vibrotactile device. The principle is that the interactive information and the... To improve the sense of reality on perception, an improved algorithm of 3D shape haptic rendering is put forward based on a finger mounted vibrotactile device. The principle is that the interactive information and the shape information are conveyed to users when they touch virtual objects at mobile terminals by attaching the vibrotactile feedback on a fingertip. The extraction of shape characteristics, the interactive information and the mapping of shape in formation of vibration stimulation are key parts of the proposed algorithm to realize the real tactile rendering. The contact status of the interaction process, the height information and local gradient of the touch point are regarded as shape information and used to control the vibration intension, rhythm and distribution of the vibrators. With different contact status and shape information, the vibration pattern can be adjusted in time to imitate the outlines of virtual objects. Finally, the effectiveness of the algorithm is verified by shape perception experiments. The results show that the improved algorithm is effective for 3D shape haptic rendering. 展开更多
关键词 finger mounted vibrotactile device 3d shapehaptic rendering algorithm contact status local gradient
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Improvement of Binocular Reconstruction Algorithm for Measuring 3D Pavement Texture Using a Single Laser Line Scanning Constraint 被引量:1
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作者 Yuanyuan Wang RuiWang +1 位作者 Xiaofeng Ren Junan Lei 《Computer Modeling in Engineering & Sciences》 SCIE EI 2023年第8期1951-1972,共22页
The dense and accurate measurement of 3D texture is helpful in evaluating the pavement function.To form dense mandatory constraints and improve matching accuracy,the traditional binocular reconstruction technology was... The dense and accurate measurement of 3D texture is helpful in evaluating the pavement function.To form dense mandatory constraints and improve matching accuracy,the traditional binocular reconstruction technology was improved threefold.First,a single moving laser line was introduced to carry out global scanning constraints on the target,which would well overcome the difficulty of installing and recognizing excessive laser lines.Second,four kinds of improved algorithms,namely,disparity replacement,superposition synthesis,subregion segmentation,and subregion segmentation centroid enhancement,were established based on different constraint mechanism.Last,the improved binocular reconstruction test device was developed to realize the dual functions of 3D texture measurement and precision self-evaluation.Results show that compared with traditional algorithms,the introduction of a single laser line scanning constraint is helpful in improving the measurement’s accuracy.Among various improved algorithms,the improvement effect of the subregion segmentation centroid enhancement method is the best.It has a good effect on both overall measurement and single pointmeasurement,which can be considered to be used in pavement function evaluation. 展开更多
关键词 3d pavement texture binocular reconstruction algorithm single laser line scanning constraint improved stereo matching
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A New 3D Wireless Directional Sensing Model and Coverage Enhancement Algorithm
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作者 Xiaojun Bi Pengfei Diao 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2016年第1期41-45,共5页
Coverage control for each sensor is based on a 2D directional sensing model in directional sensor networks conventionally. But the 2D model cannot accurately characterize the real environment. In order to solve this p... Coverage control for each sensor is based on a 2D directional sensing model in directional sensor networks conventionally. But the 2D model cannot accurately characterize the real environment. In order to solve this problem,a new 3D directional sensor model and coverage enhancement algorithm is proposed. We can adjust the pitch angle and deviation angle to enhance the coverage rate. And the coverage enhancement algorithm is based on an improved gravitational search algorithm. In this paper the two improved strategies of GSA are directional mutation strategy and individual evolution strategy. A set of simulations show that our coverage enhancement algorithm has a good performance to improve the coverage rate of the wireless directional sensor network on different number of nodes,different virtual angles and different sensing radius. 展开更多
关键词 3d WIRELESS directional sensor network COVERAGE ENHANCEMENT GRAVITATIONAL SEARCH algorithm
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Fragile Watermarking of 3D Models Using Genetic Algorithms
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作者 Mukesh Motwani Rakhi Motwani Frederick Harris 《Journal of Electronic Science and Technology》 CAS 2010年第3期244-250,共7页
This paper describes a novel algorithm for fragile watermarking of 3D models. Fragile watermarking requires detection of even minute intentional changes to the 3D model along with the location of the change. This pose... This paper describes a novel algorithm for fragile watermarking of 3D models. Fragile watermarking requires detection of even minute intentional changes to the 3D model along with the location of the change. This poses a challenge since inserting random amount of watermark in all the vertices of the model would generally introduce perceptible distortion. The proposed algorithm overcomes this challenge by using genetic algorithm to modify every vertex location in the model so that there is no perceptible distortion. Various experimental results are used to justify the choice of the genetic algorithm design parameters. Experimental results also indicate that the proposed algorithm can accurately detect location of any mesh modification. 展开更多
关键词 3d mesh models fragile water- marking genetic algorithms SNR.
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A New Three-Dimensional(3D)Printing Prepress Algorithm for Simulation of Planned Surgery for Congenital Heart Disease
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作者 Vitaliy Suvorov Olga Loboda +1 位作者 Maria Balakina Igor Kulczycki 《Congenital Heart Disease》 SCIE 2023年第5期491-505,共15页
Background:Three-dimensional printing technology may become a key factor in transforming clinical practice and in significant improvement of treatment outcomes.The introduction of this technique into pediatric cardiac... Background:Three-dimensional printing technology may become a key factor in transforming clinical practice and in significant improvement of treatment outcomes.The introduction of this technique into pediatric cardiac surgery will allow us to study features of the anatomy and spatial relations of a defect and to simulate the optimal surgical repair on a printed model in every individual case.Methods:We performed the prospective cohort study which included 29 children with congenital heart defects.The hearts and the great vessels were modeled and printed out.Measurements of the same cardiac areas were taken in the same planes and points at multislice computed tomography images(group 1)and on printed 3D models of the hearts(group 2).Pre-printing treatment of the multislice computed tomography data and 3D model preparation were performed according to a newly developed algorithm.Results:The measurements taken on the 3D-printed cardiac models and the tomographic images did not differ significantly,which allowed us to conclude that the models were highly accurate and informative.The new algorithm greatly simplifies and speeds up the preparation of a 3D model for printing,while maintaining high accuracy and level of detail.Conclusions:The 3D-printed models provide an accurate preoperative assessment of the anatomy of a defect in each case.The new algorithm has several important advantages over other available programs.They enable the development of customized preliminary plans for surgical repair of each specific complex congenital heart disease,predict possible issues,determine the optimal surgical tactics,and significantly improve surgical outcomes. 展开更多
关键词 3d printing imaging in cardiac surgery congenital heart disease modelling in cardiac surgery pediatric cardiology algorithmic modelling of the heart medical imaging 3d modelling
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An improved bicubic imaging fitting algorithm for 3D radar detection target
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作者 Li Fan-Ruo Yang Feng +3 位作者 Yan Rui Qiao Xu Li Yi-Jin Xing Hong-Jia 《Applied Geophysics》 SCIE CSCD 2022年第4期553-562,604,共11页
3D ground-penetrating radar has been widely used in urban road underground disease detection due to its nondestructive,efficient,and intuitive results.However,the 3D imaging of the underground target body presents the... 3D ground-penetrating radar has been widely used in urban road underground disease detection due to its nondestructive,efficient,and intuitive results.However,the 3D imaging of the underground target body presents the edge plate phenomenon due to the space between the 3D radar array antennas.Consequently,direct 3D imaging using detection results cannot reflect underground spatial distribution characteristics.Due to the wide-beam polarization of the ground-penetrating radar antenna,the emission of electromagnetic waves with a specific width decreases the strong middle energy on both sides gradually.Therefore,a bicubic high-precision 3D target body slice-imaging fitting algorithm with changing trend characteristics is constructed by combining the subsurface target characteristics with the changing spatial morphology trends.Using the wide-angle polarization antenna’s characteristics in the algorithm to build the trend factor between the measurement lines,the target body change trend and the edge detail portrayal achieve a 3D ground-penetrating radar-detection target high-precision fitting.Compared with other traditional fitting techniques,the fitting error is small.This paper conducts experiments and analyses on GpaMax 3D forward modeling and 3D ground-penetrating measured radar data.The experiments show that the improved bicubic fitting algorithm can eff ectively improve the accuracy of underground target slice imaging and the 3D ground-penetrating radar’s anomaly interpretation. 展开更多
关键词 urban underground space safety 3d ground-penetrating radar detection of the abnormal bicubic fitting algorithm high-precision imaging
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Research on a bifurcation location algorithm of a drainage tube based on 3D medical images
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作者 Qiuling Pan Wei Zhu +2 位作者 Xiaolin Zhang Jincai Chang Jianzhong Cui 《Visual Computing for Industry,Biomedicine,and Art》 2020年第1期7-17,共11页
Based on patient computerized tomography data,we segmented a region containing an intracranial hematoma using the threshold method and reconstructed the 3D hematoma model.To improve the efficiency and accuracy of iden... Based on patient computerized tomography data,we segmented a region containing an intracranial hematoma using the threshold method and reconstructed the 3D hematoma model.To improve the efficiency and accuracy of identifying puncture points,a point-cloud search arithmetic method for modified adaptive weighted particle swarm optimization is proposed and used for optimal external axis extraction.According to the characteristics of the multitube drainage tube and the clinical needs of puncture for intracranial hematoma removal,the proposed algorithm can provide an optimal route for a drainage tube for the hematoma,the precise position of the puncture point,and preoperative planning information,which have considerable instructional significance for clinicians. 展开更多
关键词 Multitube drainage tube Bifurcation localization algorithm 3d medical image Path planning Intracranial hematoma
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A Study on Parallel Computation Based on 3D Forward Algorithm of Gravity
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作者 Mao Wang Yuanman Zheng Changli Yao 《International Journal of Geosciences》 2017年第9期1073-1079,共7页
Interpretation of geophysical material is the prospecting method. Interpretation of Gravity-megnetic data is based on data processing and inversion. When the grid is divided into several million cells, the computing t... Interpretation of geophysical material is the prospecting method. Interpretation of Gravity-megnetic data is based on data processing and inversion. When the grid is divided into several million cells, the computing task is heavy and time-consuming. In order to increase efficiency of the 3D forward modeling, the paper will adopt MPI parallel algorithm and the several processes will deal with data in the method. Finally, we can gather the result. Through comparing the result of sequence algorithm with the result of MPI parallel algorithm, we can see the result is the same. When the number of processes is 2 to 8, the speed-up ratio is 1.97 to 5. The MPI parallel algorithm is very efficient. 展开更多
关键词 GRAVITY 3d FORWARd MOdELING PARALLEL algorithm MPI
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A Graphic Algorithm of"Track" Effect in 3D Games
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作者 ZHANGPeng 《International English Education Research》 2017年第1期55-56,共2页
In 3D games, a lot of weapons in the movement will drag a "follow the shadow" effect, which is called the "track". In this paper, we first analyze the change rule of the "track", and then put forward a kind of a... In 3D games, a lot of weapons in the movement will drag a "follow the shadow" effect, which is called the "track". In this paper, we first analyze the change rule of the "track", and then put forward a kind of algorithm to realize the "track". The calculation of this algorithm is small, but the effect is very real, has been successfully applied to a variety of 3D games. 展开更多
关键词 Track Graphic algorithm 3d games
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A NEW EFFICIENT 3D OSTEOTOMY ALGORITHM FOR COMPUTER OPERATION SIMULATION
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作者 Jing Li Guiping Jiang +1 位作者 Shuxiang Li Bin Yang(Dept. Of BME. The First Military Medical University)(Dept. Of Oral and Maxillofacial Surgery’ Sun Yat-sen University of Medical SciencesGuangZhou, Guangdong China 510515.) 《Chinese Journal of Biomedical Engineering(English Edition)》 1999年第3期43-43,共1页
关键词 OPENGL A NEW EFFICIENT 3d OSTEOTOMY algorithm FOR COMPUTER OPERATION SIMULATION
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3维Douglas-Peucker算法及其在DEM自动综合中的应用研究 被引量:49
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作者 费立凡 何津 +1 位作者 马晨燕 颜辉武 《测绘学报》 EI CSCD 北大核心 2006年第3期278-284,共7页
在分析2维Douglas-Peucker算法原理实质的基础上,提出3维Douglas-Peucker算法,并将此法应用到对DEM的基础———3维离散点的自动综合上。采用计算机程序对新算法进行的验证,初步结果表明该算法能较好地筛选出DEM整体及局部范围的地貌特... 在分析2维Douglas-Peucker算法原理实质的基础上,提出3维Douglas-Peucker算法,并将此法应用到对DEM的基础———3维离散点的自动综合上。采用计算机程序对新算法进行的验证,初步结果表明该算法能较好地筛选出DEM整体及局部范围的地貌特征点,其计算效率也较令人满意。 展开更多
关键词 douglas—Peucker算法 2维曲线综合 3douglas—Peucker算法 3维离散点综合 dEM综合
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Parallel rapid relaxation inversion of 3D magnetotelluric data 被引量:8
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作者 林昌洪 谭捍东 佟拓 《Applied Geophysics》 SCIE CSCD 2009年第1期77-83,104,共8页
We implement a parallel algorithm with the advantage of MPI (Message Passing Interface) to speed up the rapid relaxation inversion for 3D magnetotelluric data. We test the parallel rapid relaxation algorithm with sy... We implement a parallel algorithm with the advantage of MPI (Message Passing Interface) to speed up the rapid relaxation inversion for 3D magnetotelluric data. We test the parallel rapid relaxation algorithm with synthetic and real data. The execution efficiency of the algorithm for several different situations is also compared. The results indicate that the parallel rapid relaxation algorithm for 3D magnetotelluric inversion is effective. This parallel algorithm implemented on a common PC promotes the practical application of 3D magnetotelluric inversion and can be suitable for the other geophysical 3D modeling and inversion. 展开更多
关键词 MAGNETOTELLURIC MPI 3d rapid relaxation inversion parallel algorithm
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基于改进3D SPIHT的MRI序列图像压缩方法 被引量:1
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作者 蒋行国 李丹 陈真诚 《航天医学与医学工程》 CAS CSCD 北大核心 2013年第2期120-124,共5页
目的研究一种有效的MRI序列图像压缩方法。方法以2组不同数量、不同层厚的MRI序列图像为例,针对3D SPIHT算法运算复杂度,在对D型、L型表项重复判断的不足上,提出了一种改进的3DSPIHT方法;同时,根据MRI序列图像的相关性特点,提出了分组编... 目的研究一种有效的MRI序列图像压缩方法。方法以2组不同数量、不同层厚的MRI序列图像为例,针对3D SPIHT算法运算复杂度,在对D型、L型表项重复判断的不足上,提出了一种改进的3DSPIHT方法;同时,根据MRI序列图像的相关性特点,提出了分组编/解码的方法,结合3D小波变换和应用改进的3D SPIHT方法,实现了MRI序列图像压缩。结果分组结合改进3D SPIHT方法与2DSPIHT,3D SPIHT相比,能够得到较好重构图像,同时,峰值信噪比(PSNR)提高了1~8 dB左右。结论在相同码率下,分组结合改进3D SPIHT的方法提高了PSNR和图像恢复质量,可以更好地解决大量MRI序列图像存储与传输问题。 展开更多
关键词 磁共振图像 3d小波变换 3d SPIHT算法 图像压缩
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