共查询到10条相似文献，搜索用时 154 毫秒
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ZHU Qiu-yu BAN Jin-cheng KAN Wei School of Communmcation Information Engineerig Shanghai Univerity Shanghai China 《上海大学学报(英文版)》2000,(Z1)
l OverviewContal~ ID autOlhatic recognition is mainly used insupervising and coalal syStems of cuStoms cochlner flowThe system is Installed at entae of port We usecOinner iD to fetch custom data of the condoner tOcheck and validate the coutape and also supervise andcO~l the syStem ~ dlsthee using network at thesame time COlhalner image iD autothatlc recognition isthe kernel of the systelnl"l The Paper stUdies arecognition technique after image captUre We useadaptive image segmentation,… 相似文献
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提出了1种的车牌图像二次定位方法,在第1次定位中初步找出包含车牌边框的车牌图像区域。再根据车牌边框对车牌图像进行倾斜校正．在此基础上,对车牌图像进行第2次定位,最终获得精确的车牌区域．测试结果表明,车牌图像二次定位方法成功率较高,能够为后续的车牌字符识别打下良好的基础． 相似文献
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提出一种虚拟仪器与机器视觉相结合的汽车牌照识别方法。应用IMAQ Vision工具包,在LabVIEW平台上开发了车牌图像识别系统,并详细介绍了图像预处理、车牌定位、字符分割和字符识别的方法。实验结果表明,该方法是可行性的,能有效识别车牌和字符。 相似文献
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车牌识别系统包括五个核心部分,分别是图像采集、图像预处理、车牌定位、字符分割、字符识别。此系统的工作过程为:首先对车牌进行预处理,确定车牌水平位置和垂直位置,即车牌的具体位置;接下来经字符分割工作提取车牌字符;最后采用模板匹配的方法完成车牌字符的识别。Matlab仿真实验结果表明,本系统的车牌识别率可达96%。 相似文献
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为了对现有小型汽车号牌识别系统进行优化,改善车牌字符识别系统性能,借助 OpenCV 图像处理开源库,在车牌图像预处理阶段采用均值滤波方法提高图像质量,采用 Sobel 边缘检测算子对图像边缘进行提取,利用交替的膨胀、腐蚀操作结合车牌长宽比实现车牌轮廓定位,并根据列像素值对车牌字符进行切割,最后采用改进的 K 近邻算法对分割后的单个车牌字符进行识别。实验结果表明,基于改进 K 近邻算法的车牌识别系统处理时间为 2.08s,识别正确率达 91.3%。与传统的 K 近邻算法相比有着更高的识别率,与神经网络法相比,有着更快的识别速度。 相似文献
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SEETHALAKSHMI R. SREERANJANI T.R. BALACHANDAR T. Abnikant Singh Markandey Singh Ritwaj Ratan Sarvesh Kumar 《浙江大学学报(A卷英文版)》2005,6(11):1297-1305
INTRODUCTION Optical Character Recognition (OCR) deals with machine recognition of characters present in an input image obtained using scanning operation. It refers to the process by which scanned images are electroni- cally processed and converted to an editable text. The need for OCR arises in the context of digitizing Tamil documents from the ancient and old era to the latest, which helps in sharing the data through the Internet. Tamil language Tamil is a South Indian language spo… 相似文献
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乳制品纸包装上的生产批号在喷码过程中由于各种原因部分字符出现粘连或缺失,影响字符的自动化识别。针对这一问题,提出了一种基于改进的CNN喷码式不规则字符识别与提取方法。首先,利用yolov3算法对生产日期区域进行提取;其次,对图像进行预处理;再次,通过一种基于字宽的分割算法结合投影法,利用相邻字符间的像素差异实现对粘连字符的分割;最后,对分割后的单个字符利用改进的CNN进行多标签分类训练得到模型。实验结果表明,改进后的模型对粘连字符和半或残缺字符的识别准确率分别为97.89%和96.71%,相较于模板匹配法、传统的LeNet-5模型、fast R-CNN+NMS模型和yolov3+K-means算法都有所提高。基于该方法设计的字符识别系统,提高了生产日期的在线识别准确率。 相似文献
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This paper presents a methodology for off-line handwritten Chinese character recognition based on mergence of consecutive segments of adaptive duration. The handwritten Chinese character string is partitioned into a sequence of consecutive segments,which are combined to implement dissimilarity evaluation within a sliding window whose durations are determined adaptively by the integration of shapes and context of evaluations. The average stroke width is estimated for the handwritten Chinese character string,and a set of candidate character segmentation boundaries is found by using the integration of pixel and stroke features. The final decisions on segmentation and recognition are made under minimal arithmetical mean dissimilarities. Experiments proved that the proposed approach of adaptive duration outperforms the method of fixed duration,and is very effective for the recognition of overlapped,broken,touched,loosely configured Chinese characters. 相似文献