共查询到20条相似文献，搜索用时 133 毫秒
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激光扫描器广泛应用于激光电视、在线检验和条码识别等领域。激光扫描器的方式多采用转镜-振镜方式,但由于转镜-振镜扫描系统存在一些固有的缺陷,会产生扫描非线性和非对称性,引起显示图象的畸变。本文将以40面转镜-振镜系统为例,即采用40面体转镜作为反射镜来获得行扫描,来分析多面体转镜系统的扫描成像问题。 相似文献
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数字水印是永久镶嵌在其他数据（宿主数据或载体数据）中具有可鉴别性的数字信号或模式。图像水印是以静止数字图像为载体的数字水印，它是数字水印研究领域也是数字图像处理领域中最具挑战性、最为活跃的研究课题之一。本文在简单介绍数字水印的基础上概述了图像水印技术，并给出了一些图像水印的算法及应用。 相似文献
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图像的二值化在数字图书馆信息处理中起着重要作用。不同的二值化方法适应不同的应用要求,讨论了三类图像二值化方法的应用,分别对扫描文字图像,灰度图像以及彩色图像的二值化进行了实验,验证了不同二值化方法的适应性。 相似文献
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在总结以往红外项目实现的基础上,着重学习研究了小波变换点目标检测技术,并就其工程实现进行了论证,尝试将模极大值小波算法应用到红外点目标检测项目中。 相似文献
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光学模式识别是模式识别的一个重要分支,它以光学相关与数字处理相结合的方式实现对图像信号的处理与识别,具有光速运算、高速并行处理、高分辨率的突出优点。本文根据光学匹配滤波的理论,用Matlab软件模拟了光学模式识别,得到了与理论一致的结果。 相似文献
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随着计算机技术的高速发展和广泛运用,CAD 软件在建筑设计和装饰设计行业中的作用也越来越大。本文针对建筑装饰设计CAD课程现状,在认真分析和总结多年的教学经验基础上,在教学内容和教学方法上做了一些分析和探讨,对于本门课程的教学具有很大的意义。 相似文献
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本文利用数字化信息实验系统,对大气压影响水的沸点实验和做功改变气体内能两个实验进行了创新设计,实现实验现象与数据显示、图像处理等多模显示同步。学生在实验操作过程中,通过对比实验现象和多模显示内容,能够更加容易地得出相应的实验结论,改变了传统实验中实验现象与数据分析分离的问题。 相似文献
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Ta-Mu Chien 《Journal of The Franklin Institute》1976,301(4):371-377
The correlation function of two Walsh functions appears in image processing, signal multiplexing, detection and spectral analysis using Walsh functions. Though Walsh functions are two-valued, their correlation functions are real-valued and rather difficult to evaluate. A recursive formula is developed in this paper to evaluate the correlation functions. Some other properties of the correlation function are also discussed. 相似文献
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Yu-Dong Zhang Suresh Chandra Satapathy David S. Guttery Juan Manuel Górriz Shui-Hua Wang 《Information processing & management》2021,58(2):102439
AimIn a pilot study to improve detection of malignant lesions in breast mammograms, we aimed to develop a new method called BDR-CNN-GCN, combining two advanced neural networks: (i) graph convolutional network (GCN); and (ii) convolutional neural network (CNN).MethodWe utilised a standard 8-layer CNN, then integrated two improvement techniques: (i) batch normalization (BN) and (ii) dropout (DO). Finally, we utilized rank-based stochastic pooling (RSP) to substitute the traditional max pooling. This resulted in BDR-CNN, which is a combination of CNN, BN, DO, and RSP. This BDR-CNN was hybridized with a two-layer GCN, and yielded our BDR-CNN-GCN model which was then utilized for analysis of breast mammograms as a 14-way data augmentation method.ResultsAs proof of concept, we ran our BDR-CNN-GCN algorithm 10 times on the breast mini-MIAS dataset (containing 322 mammographic images), achieving a sensitivity of 96.20±2.90%, a specificity of 96.00±2.31% and an accuracy of 96.10±1.60%.ConclusionOur BDR-CNN-GCN showed improved performance compared to five proposed neural network models and 15 state-of-the-art breast cancer detection approaches, proving to be an effective method for data augmentation and improved detection of malignant breast masses. 相似文献
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Franky D. Shah Rasheedunnisa Begum Bhairavi N. Vajaria Kinjal R. Patel Jayendra B. Patel Shilin N. Shukla Prabhudas S. Patel 《Indian journal of clinical biochemistry : IJCB》2011,26(4):326-334
Oral cancer has emerged as an alarming public health problem with increasing incidence and mortality rates all over the world.
Therefore, the implementation of newer screening and early detection approaches are of utmost importance which could reduce
the morbidity and mortality associated with this disease. Sensitive and specific biomarkers for oral cancer are likely to
be most effective for screening, diagnosis, staging and follow-up for this dreaded malignancy. Unlike other deep cancers,
oral cancer is located in oral cavity. Hence, the direct contact between saliva and oral cancer lesion makes the measurement
of tumor markers in saliva an attractive alternative to serum and tissue testing. The DNA, RNA and protein molecules derived
from the living cancer cells can be conveniently obtained from saliva. Thus, salivary biomarkers, a non-invasive alternative
to serum and tissue-based biomarkers may be an effective modality for early diagnosis, prognostication and monitoring post
therapy status. In the current post-genomic era, various technologies provide opportunities for high-throughput approaches
to genomics and proteomics; which have been used to evaluate altered expressions of gene and protein targets in saliva of
oral cancer patients. The emerging field of salivary biomarkers has great potentials to prove its clinical significance to
combat oral cancer. Hence, we have reviewed importance of several salivary genomics and proteomics biomarkers for oral cancer. 相似文献
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Faten Zahran Ramzy Rashed Mohamed Omran Hossam Darwish Arafa Belal 《Indian journal of clinical biochemistry : IJCB》2021,36(3):319
A metabolomic study for determination of certain urinary metabolomes, 1-methyladenosine (1-MA), 1-methylguanosine (1-MG), and 8-hydroxy-2′ deoxyguanosine (8-OHdG) in urine specimens of breast cancer patients. The accuracy of these metabolites and their combined score with cancer antigen 15-3 (CA15-3) was developed to improve the early detection of breast cancer. This study recruited 52 healthy individuals, 47 benign breast tumors, and 167 malignant breast tumor patients. Urine samples were handled to adjust the creatinine concentrations to 8 mg/dL (0.7 mmol/L) and analyzed using GC–MS to detect and quantify the selected urinary metabolomes in urine samples of all participants. The accuracy of individual urinary metabolomes and their combination with CA15-3 were evaluated using multivariate statistical analysis. The cutoff value of CA15-3 was 32.5 U/mL. Cutoff values of 1-MA, 1-MG, and 8-OHdG were 2.19, 2.1, and 7.3 µmol/mmol creatinine, respectively. The concentrations of 1-MA, 1-MG, and 8-OHdG were significantly higher in breast cancer patients, especially in the early-stage. The combination of three urinary metabolomes with CA15-3 improves the diagnostic sensitivity of breast cancer. For the combined score, the area under the curve (AUC) value of combined score ranged from 0.820 to 0.950, with high accuracy, ranged from 77.0 to 95.5%. The most significant AUC (0.973), sensitivity (90.1%), selectivity (94.0%) was recorded at comparing the healthy control with the early-stage of malignant breast cancer. In conclusion, the combination of three urinary metabolomes with serum CA15-3 improves the diagnostic sensitivity of breast cancer. 相似文献
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随着数字图书馆中数字视频资源的增长,数字视频版权保护问题逐渐暴露出来。基于内容的视频拷贝检测技术作为一种有效的版权保护技术,近年来逐渐受到研究人员的关注。本文对基于内容的视频拷贝检测的关键技术视频指纹提取和指纹匹配的研究成果进行了分析,总结了指纹提取和指纹匹配的研究现状,指出了该领域存在的问题,最后分析了该领域的发展方向。 相似文献
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在模型简化、图像处理和分析、模式识别以及计算机视觉等应用中常常涉及到数字曲线的多边形逼近问题。对该问题的国内外研究成果进行了较为系统地介绍,对一些典型算法的优缺点进行了分析,对相关技术的发展进行了展望。 相似文献
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提出了肿瘤图像处理系统的软硬件结构,介绍了图像处理、图像测量和电子医嘱功能的设计,采用VC 完成了CDIB类的封装,并在此基础上实现了图像处理算法、图像手工测量和电子医嘱的功能。 相似文献
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提出了肿瘤图像处理系统的软硬件结构,介绍了图像处理、图像测量和电子医嘱功能的设计,采用VC++完成了CDIB类的封装,并在此基础上实现了图像处理算法、图像手工测量和电子医嘱功能。 相似文献
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基于动态偏移场模型,本文提出了一种适用于空变失真图像序列的视频稳定化技术。以空不变图像序列的运动滤波技术为基础,采用空变图像序列的运动估计和频域滤波技术实现了透视失真序列的稳定化。实验结果表明,经稳定化处理后的透视失真视频序列,高频抖动被滤除,图像序列呈现出稳定的透视失真现象。如果已知失真的物理机理,实现稳定化的同时还可以实现透视失真的校正。该技术不仅可以应用在视频稳定化系统中,还可以应用到其他空变失真图像序列的失真校正领域。 相似文献