The flexibility of traditional image processing system is limited because those system are designed for specific applications. In this paper, a new TMS320C64x-based multi-DSP parallel computing architecture is present...The flexibility of traditional image processing system is limited because those system are designed for specific applications. In this paper, a new TMS320C64x-based multi-DSP parallel computing architecture is presented. It has many promising characteristics such as powerful computing capability, broad I/O bandwidth, topology flexibility, and expansibility. The parallel system performance is evaluated by practical experiment.展开更多
This paper aims at a type of image homing guided missile. The guided trajectory characteristics and the initial condition of the homing guidance are analyzed by calculating the miss distance of the image guided missil...This paper aims at a type of image homing guided missile. The guided trajectory characteristics and the initial condition of the homing guidance are analyzed by calculating the miss distance of the image guided missile. Several modified proportional navigation laws which are easy for engineering implementation are introduced.展开更多
A novel reconfigurable hardware system which uses both muhi-DSP and FPGA to attain high performance and real-time image processing are presented. The system structure and working principle of mainly processing multi-B...A novel reconfigurable hardware system which uses both muhi-DSP and FPGA to attain high performance and real-time image processing are presented. The system structure and working principle of mainly processing multi-BSP board, extended multi-DSP board are analysed. The outstanding advantage is that the communication among different board components of this system is supported by high speed link ports ＆ serial ports for increasing the system performance and computational power. Then the implementation of embedded real-time operating systems （RTOS） by us is discussed in detail. In this system, we adopt two kinds of parallel structures controlled by RTOS for parallel processing of algorithms. The experimental results show that exploitive period of the system is short, and maintenance convenient. Thus it is suitable for real-time image processing and can get satisfactory effect of image recognition.展开更多
针对目前去雾方法对于明亮区域的处理效果及抗噪性能较差的问题,提出基于透射率多重引导与锐化补偿的图像去雾算法(Image Defogging Algorithm Based on Transmittance Multiple Guidance and Sharpening Compensation,DTGSC)。该算法...针对目前去雾方法对于明亮区域的处理效果及抗噪性能较差的问题,提出基于透射率多重引导与锐化补偿的图像去雾算法(Image Defogging Algorithm Based on Transmittance Multiple Guidance and Sharpening Compensation,DTGSC)。该算法首先运用阈值分割的方法求解大气光值,通过对原图中白色区域进行定义分割,提升了大气光值的取值精度;其次为保证所提模型能够有效处理图像中的不同区域,设计了多重引导的方法进行透射率取值,将明亮区域的失真问题转换为缩减透射率取值误差问题。此外,将高斯滤波引入到图像三通道中进行降噪处理,在实现去雾的同时并提升模型的抗噪性能;最后使用图像锐化的方法对去雾结果进行增强,并通过设定目标调整亮度,完成当前亮度向目标亮度的深度补偿,实现去雾后图像边缘细节与可视化效果的联合优化。实验结果表明,所提算法在四种数据集下得到的图像MSE平均值为11.07,PSNR平均值为39.78 dB,SSIM平均值为87.83%,在薄雾数据集上的平均去雾时间达到0.63 s。相对于DCMPNet算法而言,MSE值平均缩减20.54 dB,PSNR值平均提升5.57 dB,SSIM值平均提升2.52%,去雾效率平均提升0.08s。以上实验结果验证了所提算法的有效性与优越性。展开更多
准确的水体提取对水资源保护、城市规划等方面具有重要的意义。然而,在遥感影像中,由于地物众多、环境复杂且不同水体可能具有不同形态、尺度及光谱特征,水体难免会与其他地物产生类内异质性及类间相似性。现有方法未充分探索边界线索...准确的水体提取对水资源保护、城市规划等方面具有重要的意义。然而,在遥感影像中,由于地物众多、环境复杂且不同水体可能具有不同形态、尺度及光谱特征,水体难免会与其他地物产生类内异质性及类间相似性。现有方法未充分探索边界线索以及未充分利用不同层之间的语义相关性及多尺度表达,导致从遥感影像中准确提取水体仍然是一项挑战性任务。针对这些问题,本文提出了一种边界引导与跨尺度信息交互网络(boundary guidance and cross-scale information interaction network,BGCIINet)用于遥感影像水体提取。首先,本文首次结合Sobel算子提出了一个边界引导(boundary guidance,BG)模块,该模块可以有效捕获低层次特征中的边界线索并高效嵌入解码器为其提供丰富的边界知识;其次,为了加强网络多尺度表达能力,促进层与层之间的信息交流,提出了一个跨尺度信息交互(cross-scale information interaction,CII)模块。在2个数据集上进行了广泛实验,结果表明:本文方法优于其他4种先进方法,在面对挑战性的场景时具有更丰富的边界细节及完整度,能够更好地应用于遥感影像水体提取并为后续研究提供方法借鉴。展开更多
目的探究3.0 T高分辨率磁共振血管壁成像(high-resolution magnetic resonance vessel wall imaging,HRMR-VWI)对椎基底动脉延长扩张症(vertebrobasilar dolichoectasia,VBD)合并后循环梗死的预测效能。材料与方法回顾性分析2021年5月至...目的探究3.0 T高分辨率磁共振血管壁成像(high-resolution magnetic resonance vessel wall imaging,HRMR-VWI)对椎基底动脉延长扩张症(vertebrobasilar dolichoectasia,VBD)合并后循环梗死的预测效能。材料与方法回顾性分析2021年5月至2024年6月我院收治的200例VBD患者的临床资料,均已接受HRMR-VWI检查。所有患者均随访至2025年3月,在随访期间有4例患者因个人原因失访,脱落率为2.00%。根据是否合并后循环梗死将患者分为研究组(合并后循环梗死,142例)及对照组(未合并后循环梗死,54例),分析HRMR-VWI指标对VBD合并后循环梗死的预测价值。根据血管腔狭窄程度将研究组分为轻度(25%≤被测血管狭窄率<50%)、中度(50%≤被测血管狭窄率<70%)及重度狭窄(被测血管狭窄率≥70%),分析HRMR-VWI指标与后循环梗死患者血管腔狭窄程度的关系。结果研究组最窄层面管腔面积小于对照组,管壁面积、斑块面积大于对照组,斑块负荷及重构指数高于对照组,差异具有统计学意义(P<0.05)。受试者工作特征(receiver operating characteristic,ROC)曲线显示,HRMR-VWI指标联合检测预测VBD合并后循环梗死的曲线下面积(area under the curve,AUC)大于各指标单独检测,差异具有统计学意义(P<0.05)。研究组甘油三酯、总胆固醇、低密度脂蛋白、载脂蛋白A1、纤维蛋白原水平高于对照组,高密度脂蛋白水平低于对照组,管腔面积<3.08 mm^(2)、管壁面积≥10.65 mm^(2)、斑块面积≥3.14 mm^(2)、斑块负荷≥0.74、重构指数≥1.01的人数比例高于对照组,差异具有统计学意义(P<0.05)。总胆固醇、载脂蛋白A1、纤维蛋白原水平升高及最窄层面管腔面积缩小、管壁面积缩小、斑块面积增大及斑块负荷和重构指数升高是VBD合并后循环梗死的危险因素(P<0.05)。研究组BA、VA不稳定斑块比例高于对照组,差异具有统计学意义(P<0.05)。VBD患者最窄层面血管面积、管腔面积与血管腔狭窄程度呈负相关,斑块面积、斑块负荷及重构指数与血管腔狭窄程度呈正相关(P<0.05)。结论3.0 T HRMR-VWI对VBD患者合并后循环梗死具有预测价值,且HRMR-VWI指标变化与患者并发后循环梗死有关。展开更多
烟幕在与精确制导武器的对抗中具有高费效比,是光电对抗最有效的手段之一。如何有效评估烟幕的干扰效能是烟幕领域的重要研究方向。目前已有学者提出采用基于图像相关性指标评估烟幕的干扰效果,但大多根据烟幕干扰前后相关度变化对评价...烟幕在与精确制导武器的对抗中具有高费效比,是光电对抗最有效的手段之一。如何有效评估烟幕的干扰效能是烟幕领域的重要研究方向。目前已有学者提出采用基于图像相关性指标评估烟幕的干扰效果,但大多根据烟幕干扰前后相关度变化对评价指标进行分析,未考虑实战中导引系统匹配、跟踪的性能,评价指标的适用性有待考证。为此,文中通过分析烟幕对目标图像的影响因素,综合考虑烟幕对图像相关度与目标匹配性能的影响,提出了一种基于仿真与外场试验的图像相关性指标筛选方法。试验验证结果表明,皮尔逊相关系数(Pearson Linear Correlation Coefficient,PLCC)与结构相似度(Structural Similarity Index Measure,SSIM)均能定量评估烟幕干扰效果,评价结果可为发烟器材的研制与运用提供辅助决策。展开更多
The concept and advantage of reconfigurable technology is introduced. A kind of processor architecture of re configurable macro processor (RMP) model based on FPGA array and DSP is put forward and has been implemented...The concept and advantage of reconfigurable technology is introduced. A kind of processor architecture of re configurable macro processor (RMP) model based on FPGA array and DSP is put forward and has been implemented. Two image algorithms are developed: template-based automatic target recognition and zone labeling. One is estimating for motion direction in the infrared image background, another is line picking-up algorithm based on image zone labeling and phase grouping technique. It is a kind of 'hardware' function that can be called by the DSP in high-level algorithm. It is also a kind of hardware algorithm of the DSP. The results of experiments show the reconfigurable computing technology based on RMP is an ideal accelerating means to deal with the high-speed image processing tasks. High real time performance is obtained in our two applications on RMP.展开更多
The speed and quality of the image fusion always restrain each other.The real-time image fusion is one of the problems which needs to be studied and solved urgently.The windowing processing technology for the image fu...The speed and quality of the image fusion always restrain each other.The real-time image fusion is one of the problems which needs to be studied and solved urgently.The windowing processing technology for the image fusion proposed in this paper can solve this problem in a certain extent.The windowing rules were put forward and the applicable scope for the windowing fusion and the calculation method for the maximum windowing area were determined.And,the results of the windowing fusion were analyzed,verified and compared to confirm the feasibility of this technology.展开更多
基金This project was supported by the National Natural Science Foundation of China (60135020).
文摘The flexibility of traditional image processing system is limited because those system are designed for specific applications. In this paper, a new TMS320C64x-based multi-DSP parallel computing architecture is presented. It has many promising characteristics such as powerful computing capability, broad I/O bandwidth, topology flexibility, and expansibility. The parallel system performance is evaluated by practical experiment.
文摘This paper aims at a type of image homing guided missile. The guided trajectory characteristics and the initial condition of the homing guidance are analyzed by calculating the miss distance of the image guided missile. Several modified proportional navigation laws which are easy for engineering implementation are introduced.
基金This project was supported by the National Natural Science Foundation of China(60135020) National Key Pre-researchProject of China(413010701 -3) .
文摘A novel reconfigurable hardware system which uses both muhi-DSP and FPGA to attain high performance and real-time image processing are presented. The system structure and working principle of mainly processing multi-BSP board, extended multi-DSP board are analysed. The outstanding advantage is that the communication among different board components of this system is supported by high speed link ports ＆ serial ports for increasing the system performance and computational power. Then the implementation of embedded real-time operating systems （RTOS） by us is discussed in detail. In this system, we adopt two kinds of parallel structures controlled by RTOS for parallel processing of algorithms. The experimental results show that exploitive period of the system is short, and maintenance convenient. Thus it is suitable for real-time image processing and can get satisfactory effect of image recognition.
文摘针对目前去雾方法对于明亮区域的处理效果及抗噪性能较差的问题,提出基于透射率多重引导与锐化补偿的图像去雾算法(Image Defogging Algorithm Based on Transmittance Multiple Guidance and Sharpening Compensation,DTGSC)。该算法首先运用阈值分割的方法求解大气光值,通过对原图中白色区域进行定义分割,提升了大气光值的取值精度;其次为保证所提模型能够有效处理图像中的不同区域,设计了多重引导的方法进行透射率取值,将明亮区域的失真问题转换为缩减透射率取值误差问题。此外,将高斯滤波引入到图像三通道中进行降噪处理,在实现去雾的同时并提升模型的抗噪性能;最后使用图像锐化的方法对去雾结果进行增强,并通过设定目标调整亮度,完成当前亮度向目标亮度的深度补偿,实现去雾后图像边缘细节与可视化效果的联合优化。实验结果表明,所提算法在四种数据集下得到的图像MSE平均值为11.07,PSNR平均值为39.78 dB,SSIM平均值为87.83%,在薄雾数据集上的平均去雾时间达到0.63 s。相对于DCMPNet算法而言,MSE值平均缩减20.54 dB,PSNR值平均提升5.57 dB,SSIM值平均提升2.52%,去雾效率平均提升0.08s。以上实验结果验证了所提算法的有效性与优越性。
文摘准确的水体提取对水资源保护、城市规划等方面具有重要的意义。然而,在遥感影像中,由于地物众多、环境复杂且不同水体可能具有不同形态、尺度及光谱特征,水体难免会与其他地物产生类内异质性及类间相似性。现有方法未充分探索边界线索以及未充分利用不同层之间的语义相关性及多尺度表达,导致从遥感影像中准确提取水体仍然是一项挑战性任务。针对这些问题,本文提出了一种边界引导与跨尺度信息交互网络(boundary guidance and cross-scale information interaction network,BGCIINet)用于遥感影像水体提取。首先,本文首次结合Sobel算子提出了一个边界引导(boundary guidance,BG)模块,该模块可以有效捕获低层次特征中的边界线索并高效嵌入解码器为其提供丰富的边界知识;其次,为了加强网络多尺度表达能力,促进层与层之间的信息交流,提出了一个跨尺度信息交互(cross-scale information interaction,CII)模块。在2个数据集上进行了广泛实验,结果表明:本文方法优于其他4种先进方法,在面对挑战性的场景时具有更丰富的边界细节及完整度,能够更好地应用于遥感影像水体提取并为后续研究提供方法借鉴。
文摘目的探究3.0 T高分辨率磁共振血管壁成像(high-resolution magnetic resonance vessel wall imaging,HRMR-VWI)对椎基底动脉延长扩张症(vertebrobasilar dolichoectasia,VBD)合并后循环梗死的预测效能。材料与方法回顾性分析2021年5月至2024年6月我院收治的200例VBD患者的临床资料,均已接受HRMR-VWI检查。所有患者均随访至2025年3月,在随访期间有4例患者因个人原因失访,脱落率为2.00%。根据是否合并后循环梗死将患者分为研究组(合并后循环梗死,142例)及对照组(未合并后循环梗死,54例),分析HRMR-VWI指标对VBD合并后循环梗死的预测价值。根据血管腔狭窄程度将研究组分为轻度(25%≤被测血管狭窄率<50%)、中度(50%≤被测血管狭窄率<70%)及重度狭窄(被测血管狭窄率≥70%),分析HRMR-VWI指标与后循环梗死患者血管腔狭窄程度的关系。结果研究组最窄层面管腔面积小于对照组,管壁面积、斑块面积大于对照组,斑块负荷及重构指数高于对照组,差异具有统计学意义(P<0.05)。受试者工作特征(receiver operating characteristic,ROC)曲线显示,HRMR-VWI指标联合检测预测VBD合并后循环梗死的曲线下面积(area under the curve,AUC)大于各指标单独检测,差异具有统计学意义(P<0.05)。研究组甘油三酯、总胆固醇、低密度脂蛋白、载脂蛋白A1、纤维蛋白原水平高于对照组,高密度脂蛋白水平低于对照组,管腔面积<3.08 mm^(2)、管壁面积≥10.65 mm^(2)、斑块面积≥3.14 mm^(2)、斑块负荷≥0.74、重构指数≥1.01的人数比例高于对照组,差异具有统计学意义(P<0.05)。总胆固醇、载脂蛋白A1、纤维蛋白原水平升高及最窄层面管腔面积缩小、管壁面积缩小、斑块面积增大及斑块负荷和重构指数升高是VBD合并后循环梗死的危险因素(P<0.05)。研究组BA、VA不稳定斑块比例高于对照组,差异具有统计学意义(P<0.05)。VBD患者最窄层面血管面积、管腔面积与血管腔狭窄程度呈负相关,斑块面积、斑块负荷及重构指数与血管腔狭窄程度呈正相关(P<0.05)。结论3.0 T HRMR-VWI对VBD患者合并后循环梗死具有预测价值,且HRMR-VWI指标变化与患者并发后循环梗死有关。
文摘烟幕在与精确制导武器的对抗中具有高费效比,是光电对抗最有效的手段之一。如何有效评估烟幕的干扰效能是烟幕领域的重要研究方向。目前已有学者提出采用基于图像相关性指标评估烟幕的干扰效果,但大多根据烟幕干扰前后相关度变化对评价指标进行分析,未考虑实战中导引系统匹配、跟踪的性能,评价指标的适用性有待考证。为此,文中通过分析烟幕对目标图像的影响因素,综合考虑烟幕对图像相关度与目标匹配性能的影响,提出了一种基于仿真与外场试验的图像相关性指标筛选方法。试验验证结果表明,皮尔逊相关系数(Pearson Linear Correlation Coefficient,PLCC)与结构相似度(Structural Similarity Index Measure,SSIM)均能定量评估烟幕干扰效果,评价结果可为发烟器材的研制与运用提供辅助决策。
文摘The concept and advantage of reconfigurable technology is introduced. A kind of processor architecture of re configurable macro processor (RMP) model based on FPGA array and DSP is put forward and has been implemented. Two image algorithms are developed: template-based automatic target recognition and zone labeling. One is estimating for motion direction in the infrared image background, another is line picking-up algorithm based on image zone labeling and phase grouping technique. It is a kind of 'hardware' function that can be called by the DSP in high-level algorithm. It is also a kind of hardware algorithm of the DSP. The results of experiments show the reconfigurable computing technology based on RMP is an ideal accelerating means to deal with the high-speed image processing tasks. High real time performance is obtained in our two applications on RMP.
文摘The speed and quality of the image fusion always restrain each other.The real-time image fusion is one of the problems which needs to be studied and solved urgently.The windowing processing technology for the image fusion proposed in this paper can solve this problem in a certain extent.The windowing rules were put forward and the applicable scope for the windowing fusion and the calculation method for the maximum windowing area were determined.And,the results of the windowing fusion were analyzed,verified and compared to confirm the feasibility of this technology.
