共查询到20条相似文献,搜索用时 171 毫秒
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针对LED显示屏以模组为最小单位进行拼接而出现模组发生空间畸变的问题,提出了基于CCD相机采集并利用图像处理技术定位检测LED显示屏模组畸变度的方法。首先,根据LED像素在采集图像上的光型分布,利用canny边缘检测方法结合闭合填充算法将LED点阵像素分割;然后,利用被分割出的空间区域信息和灰度信息,采用加权质心法对每个LED像素进行亚像素级的加权定位。接着,以模组拼接的LED显示屏为例,构建了模组畸变模型,并根据畸变模组和理想模组的线性关系利用最小二乘法进行拟合;最后,利用梯度下降法求得每个模组的畸变参数。实验结果表明:采用这种方法测量多种模组LED点间距的精度为0.5mm,模组畸变特征参数的测量过程中,角度测量精度为1.3°,位移测量精度为2.2mm,基本满足自动影像测量的稳定可靠、精度高、抗干扰能力强等要求,并可在户外机械检测无法测量的情况下应用。 相似文献
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陈秀美 《卫星电视与宽带多媒体》2011,(11):63-65
最近,笔者根据一些资料,制作了一块16*16的LED点阵,可以用于显示汉字。其基本的原理,就是用51单片机分别控制点阵的行和列,利用人眼的视觉暂留效应,动态扫描地显示汉字。 相似文献
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<正> ATMEAG16L 驱动128×64点阵图形液晶模块的实验点阵图形液晶模块是一种用于显示各类图像、符号、汉字的显示模块,其显示屏的点阵像素连续排列,行和列在排布中没有间隔,因此可以显示连续、完整的图形。当然它也能显示字母、数字等字符。点阵图形液晶模块依控制芯片的不同,其功能及控制方法与点阵字符液晶模块相比略有不同。点阵图形液晶模块的 相似文献
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LED点阵动态显示系统设计及仿真 总被引:1,自引:0,他引:1
设计了一种基于AT89C51单片机的16×16LED点阵动态显示系统,给出了LED点阵动态显示原理和汉字取模方法;在Proteus环境下进行了点阵显示系统行、列驱动电路硬件设计,同时采用Keil软件完成了系统主程序、显示驱动程序的设计;最后进行了系统Proteus仿真,降低了成本,提高了开发效率,并获得了良好的显示效果。 相似文献
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点阵图形液晶模块是一种用于显示各类图像、符号、汉字的显示模块,其显示屏的点阵像素连续排列,行和列在排布中没有间隔,因此可以显示连续、完整的图形.当然它也能显示字母、数字等字符.点阵图形液晶模块依控制芯片的不同,其功能及控制方法与点阵字符液晶模块相比略有不同.点阵图形液晶模块的控制芯片生产厂商较多,以下为典型的几种.日立... 相似文献
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基于单片机的LED点阵显示控制的设计 总被引:1,自引:0,他引:1
LED点阵显示屏具有运行可靠、安全、节能、成本低、使用方便等特点.本文讨论了基于单片机的LED点阵显示控制系统设计所用的各种方法,制作出一个以单片机作为控制单元的点阵显示屏.设计采用动态扫描的显示方法,选取74LS154和74LS595芯片分别构成行、列驱动电路,单片机通过行、列驱动电路,可对点阵显示模块单元进行行列信号控制,达到控制点阵显示屏正常显示汉字、图片信息的设计要求. 相似文献
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基于电力线载波模块的LED点阵图文显示系统 总被引:1,自引:0,他引:1
设计了基于电力线载波模块及单片机的LED点阵图文显示控制系统。该系统以基于STC7538芯片的电力线载波模块为显示信息传输工具,以STC12C5A60S2单片机为控制核心,以LED专用16位元恒流驱动器MBI5024为点阵列驱动控制,行地址经译码后通过中功率三极管控制点阵行驱动。LED点阵采用模块化设计,将高亮LED制成16×16点阵模块,再由多个模块拼接成。 相似文献
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To warp diffusion tensor fields accurately, tensors must be reoriented in the space to which the tensors are warped based on both the local deformation field and the orientation of the underlying fibers in the original image. Existing algorithms for warping tensors typically use forward mapping deformations in an attempt to ensure that the local deformations in the warped image remains true to the orientation of the underlying fibers; forward mapping, however, can also create ldquoseamsrdquo or gaps and consequently artifacts in the warped image by failing to define accurately the voxels in the template space where the magnitude of the deformation is large (e.g., |Jacobian| > 1). Backward mapping, in contrast, defines voxels in the template space by mapping them back to locations in the original imaging space. Backward mapping allows every voxel in the template space to be defined without the creation of seams, including voxels in which the deformation is extensive. Backward mapping, however, cannot reorient tensors in the template space because information about the directional orientation of fiber tracts is contained in the original, unwarped imaging space only, and backward mapping alone cannot transfer that information to the template space. To combine the advantages of forward and backward mapping, we propose a novel method for the spatial normalization of diffusion tensor (DT) fields that uses a bijection (a bidirectional mapping with one-to-one correspondences between image spaces) to warp DT datasets seamlessly from one imaging space to another. Once the bijection has been achieved and tensors have been correctly relocated to the template space, we can appropriately reorient tensors in the template space using a warping method based on Procrustean estimation. 相似文献
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新的基于Kalman滤波的跟踪方法 总被引:9,自引:4,他引:5
模板更新策略是匹配跟踪算法成败的关键,为了提高基于模板匹配跟踪算法的性能,在分析多种模板更新算法的基础上,给出使用Kalman滤波器更新模板的方法。该方法不再将模板图像视为一个整体,而是使用Kalman滤波器对模板图像逐像素点进行更新,以得到自适应和最佳的目标模板图像,使匹配跟踪算法的性能得到很大提高,特别对于目标被遮挡、目标姿态变化以及环境照度变化有很强的适应性。对匹配算法的改进和遮挡的处理使该算法的性能得到进一步提高。实验结果表明该方法行之有效。 相似文献
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人工识别光缆喷码字符弊端众多,亟需光缆自动化识别技术.针对光缆喷码点阵字符特点,提出一种在线光缆喷码字符识别系统,对模板匹配、人工神经网络和支持向量机等3种字符识别算法进行仿真研究和参数优化,并比较了这3种算法的优劣;分析了人工神经网络和支持向量机相关参数对识别准确率和训练时间的影响.仿真结果表明:相同测试集下,人工神... 相似文献
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基于Trace-Pro软件的LCD导光板网点分布仿真与研究 总被引:2,自引:0,他引:2
针对目前背光模组的均匀度差和亮度低的问题,利用Trace-Pro光学仿真软件对印刷式导光板的网点分布进行模拟分析,着重提高光输出的均匀度。采取分块优化来简化设计,通过与网点面积密度比的关联,利用网点密度比、网点半径和间距三者的关系,进行相互转化,拟合出间距的整体性最佳化曲线,从而避免了重复建模和光线追迹。通过这种网点设计方法获得了高照度下均匀度大于90%的导光板的网点分布。将优化结果与实际导光板尺寸比较对比可知,间距平均值偏差1.6μm以下,半径平均值偏差±2.7μm以下。实验结果与计算分析结果吻合得较好,对实际生产有一定的指导意义。 相似文献
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Francesco Raimondo Marios A Gavrielides Georgia Karayannopoulou Kleoniki Lyroudia Ioannis Pitas Ioannis Kostopoulos 《IEEE transactions on image processing》2005,14(9):1288-1299
The evaluation of fluorescent in situ hybridization (FISH) images is one of the most widely used methods to determine Her-2/neu status of breast samples, a valuable prognostic indicator. Conventional evaluation is a difficult task since it involves manual counting of dots in multiple images. In this paper, we present a multistage algorithm for the automated classification of FISH images from breast carcinomas. The algorithm focuses not only on the detection of FISH dots per image, but also on combining results from multiple images taken from a slice for overall case classification. The algorithm includes mainly two stages for nuclei and dot detection respectively. The dot segmentation consists of a top-hat filtering stage followed by template matching to separate real signals from noise. Nuclei segmentation includes a nonlinearity correction step, global thresholding to identify candidate regions, and a geometric rule to distinguish between holes within a nucleus and holes between nuclei. Finally, the marked watershed transform is used to segment cell nuclei with markers detected as regional maxima of the distance transform. Combining the two stages allows the measurement of FISH signals ratio per cell nucleus and the collective classification of cases as positive or negative. The system was evaluated with receiver operating characteristic analysis and the results were encouraging for the further development of this method. 相似文献