共查询到17条相似文献,搜索用时 62 毫秒
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场致发射显示器新型图像驱动技术的研究 总被引:3,自引:1,他引:2
在分析和研究了原有灰度调制驱动电路以及低逸出功印刷型场致发射显示器(Field emission display, FED)的显示特性之后,提出了新型子行驱动图像还原技术.子行驱动技术能应用于不具备存储特性的显示器中,具有更小缓存容量需求和更高显示时间利用率等优点,更适合于场致发射显示器的驱动显示.详细介绍了新型图像驱动系统的工作原理及实现方案,同时为了解决子行驱动法对后级驱动芯片工作速度要求高的问题,在降低图像灰度数据位数的同时应用误差扩散法来实现真彩图像的还原.该技术已成功应用于FED驱动系统中并研制出彩色FED显示器样机.该样机能显示彩色视频图像,对角线为63.5 cm (25 in),亮度达300 cd/m2,对比度为800:1. 相似文献
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彩色交流等离子体显示器采用了子场技术来实现灰度的显示,希望用较少的子场进行显示高灰度级的图像,这样可以减少用于寻址的时间,增加维持显示的时间。用较少子场或灰度级显示高灰度等级图像时,如果不采用图像增强技术会出现明显的假轮廓现象,基于MATLAB的数字图像处理技术,提出了一种基于边缘检测的动态误差扩散算法,经仿真结果表明,这一方法应用于交流等离子体显示器中,不仅能够减少因较少子场引起的假轮廓,同时还可以较好地避免轮廓细节的损失。 相似文献
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伽玛值、白场色温及亮度对显示效果的影响 总被引:5,自引:3,他引:2
对Gamma值、白场色温及亮度参数对显示颜色的影响进行了定量的研究。实验结果表明:选择恰当的伽玛值可以改善图像的显示效果;色温的影响大于伽玛值,选择色温值要根据显示器的具体工作环境来决定;亮度对显示效果几乎没有影响,可以根据观察条件来选择。 相似文献
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提出一种针对HDR图像的显示方法,该方法应用于LCD-LED双调制高动态显示器,旨在使显示器更好地显示HDR图像要求的亮度细节,提高视觉质量。首先,建立HDR图像亮度与LED亮度范围对应关系,使用光扩散函数作为背光LED亮度取值范围的权重。然后,统计LED的亮度辐射区域内不同LED发光强度等级的权重,取权重最大者对应的亮度作为该背光LED亮度。最后,利用依据LED亮度生成LED背光扩散图像与HDR图像计算出LCD显示图像。仿真结果表明,该算法可以使显示器亮度失真率系数低至0.006以下。在LCD-LED双调制高动态显示器上实验验证结果表明,该算法可以有效提高图像的层次感,有效抑制LCD-LED双调制高动态显示器的"光晕"以及亮度截断现象,提高显示质量。 相似文献
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自适应反馈视觉感知差的误差扩散半色调算法 总被引:1,自引:0,他引:1
文章基于人眼对亮度的视觉感受特性。提出了一种自适应反馈视觉感知差的误差扩散算法(PEF Error Diffusion算法)。首先提出视觉感知差的概念,然后根据原图像区域的灰度特征,自适应地计算反馈系数,将视觉感知差反馈给原连续调图像,以补偿误差扩散所引起的不同区域的灰度损失。实验结果表明,由于视觉感知差的引入及反馈系数的自适应变化。PEF Error Diffusion算法能够明显增强图像的整体对比度.减弱点增益现象的不良影响,并准确再现更多的图像细节.因而表现出比传统算法更好的主观视觉效果。 相似文献
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Multigrid anisotropic diffusion 总被引:6,自引:0,他引:6
A multigrid anisotropic diffusion algorithm for image processing is presented. The multigrid implementation provides an efficient hierarchical relaxation method that facilitates the application of anisotropic diffusion to time-critical processes. Through a multigrid V-cycle, the anisotropic diffusion equations are successively transferred to coarser grids and used in a coarse-to-fine error correction scheme. When a coarse grid with a trivial solution is reached, the coarse grid estimates of the residual error can be propagated to the original grid and used to refine the solution. The main benefits of the multigrid approach are rapid intraregion smoothing and reduction of artifacts due to the elimination of low-frequency error. The theory of multigrid anisotropic diffusion is developed. Then, the intergrid transfer functions, relaxation techniques, diffusion coefficients, and boundary conditions are discussed. The analysis includes the examination of the storage requirements, the computational cost, and the solution quality. Finally, experimental results are reported that demonstrate the effectiveness of the multigrid approach. 相似文献
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Hierarchical Error Diffusion 总被引:1,自引:0,他引:1
Zhen He 《IEEE transactions on image processing》2009,18(7):1524-1535
This paper develops a distinctive class of color error diffusion algorithm, called hierarchical error diffusion (HED). It aims to achieve perceptually pleasing color halftone through neither conventional joint quantization nor interchannel error diffusion. Instead, it explicitly controls three critical factors sequentially to yield high-quality color halftone: dot-overlapping control, dot-positioning control, and dot-coloring control. A specific implementation of HED is presented with the objective of minimum brightness variation rendering (MBVR). First, an optimal color transform is derived for dot-overlapping control to achieve minimum brightness variation color density (MBVCD). Then, the embedded monochrome error diffusion is employed in dot-positioning control. By sequentially thresholding the elements in partial density sum vector, better dot-positioning is encouraged for more visible color dots. The ldquoblue noiserdquo characteristics of dot-positioning from the monochrome error diffusion are inherited by the color halftone. The simple density priority strategy is applied in dot-coloring control. The pixel color error is diffused channel-independently with a single error filter in halftone dot color space. A comparison with the state-of-the-art color error diffusion algorithms demonstrates excellent halftone quality of HED, while without the typical artifacts of vector error diffusion. Evidence also shows that HED is closer to achieve MBVR than the minimum brightness variation quantization (MBVQ) color diffusion algorithm proposed in. 相似文献
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最新一代可见近红外(VNIR)和短波红外(SWIR)双通道星载高光谱成像仪,多采用视场分离器将VNIR和SWIR通道分离为多个子视场,同一时刻各子视场对地成像区域不同,在采用运动补偿技术提高图像信噪比时,各子视场对同一地物的观测角不同,导致图像间失配关系复杂,无法获取同一地物的VNIR-SWIR连续光谱。通过建立运动补偿下的严格成像几何模型,定量分析了双通道图像的畸变和失配规律,进而提出了各子视场分别几何定位再相位相关法配准的方案,并利用东天山区域运动补偿下星载双通道高光谱仿真数据进行验证。结果表明,传统的基于图像的配准方案精度为3.9像元,仍无法得到同一地物像元的VNIR-SWIR光谱曲线,文中方案配准精度提高到0.3像元,VNIR和SWIR重叠波段的反射率光谱重合度误差由41.5%降低到1.2%。 相似文献