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对于场发射三极管,提高使用频率,增加跨导以提高增益是设计的关键。因此,本文在研究场发射三极管工作原理的基础上,重点分析了场发射三极管结构参数与电参数的关系,设计出了两种结构、四种尺寸的自对准栅场发射三极管单元结构参数,并对它们的性能进行了讨论。 相似文献
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对于场发射三极管,提高使用频率,增加跨导以提高增益是设计的关键。因此,本文在研究场发射三级管工作原理的基础上,重点分析了场发射三极管结构参数与电参数的关系。 相似文献
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对相同的衬底进行不同的处理后,放入微薄等离子体腔中,在不同的条件下制备出纯平金刚石碳膜和球状金刚石聚晶颗粒碳膜,通过扫描电镜、拉曼光谱、X射线分析碳膜的形貌与结构,利用场发射二级结构研究两种金刚石碳膜的场发射性能,简单分析了不同碳膜的成因和场发射性能。 相似文献
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场离子显示屏—一种新型彩色平板显示屏 总被引:1,自引:0,他引:1
场离子显示屏,是一种既能够克服场发射显示屏在存在的困难,实现阴极射线显象管平板化,又能保持CRT优良图像质量的新型彩色平板显示屏。本文先介绍场离子发射的原理,然后介绍了FID的结构及工作原理。 相似文献
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This paper presents a full-reference image quality estimator based on color, structure, and visual system characteristics denoted as CSV. In contrast to the majority of existing methods, we quantify perceptual color degradations rather than absolute pixel-wise changes. We use the CIEDE2000, color difference formulation to quantify low-level color degradations and the Earth Mover's Distance between color name probability vectors to measure significant color degradations. In addition to the perceptual color difference, CSV also contains structural and perceptual differences. Structural feature maps are obtained by mean subtraction and divisive normalization, and perceptual feature maps are obtained from contrast sensitivity formulations of retinal ganglion cells. The proposed quality estimator CSV is tested on the LIVE, the Multiply Distorted LIVE, and the TID 2013 databases, and it is always among the top two performing quality estimators in terms of at least ranking, monotonic behavior or linearity. 相似文献
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非晶硅集成型色敏元件及其传感器 总被引:1,自引:1,他引:0
研究了一种新型的非晶硅PIN异质结集成型色敏元件及其传感器的制备工艺和结构,详细讨论了色敏元件的优化设计以及响应特性、暗电流等性能。 相似文献
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一种基于标准色块与多项式拟合的CRT色彩管理新模型 总被引:1,自引:0,他引:1
CRT显示器的色彩管理是彩色图像复制的关键技术之一.本文在分析CRT显色原理的基础上,提出了一种新的CRT色彩管理模型.该算法将CRT的RGB色空间、CIEXYZ色空间和三色传感器驱动值之间的关系转换为两两关系分别求取.最后用本文的转换模型得到的X、Y、Z计算值与实际测量值进行比较,以及用本文算法与普通多项式拟合算法和三维查找表算法得到的色彩转换精度比较,均表明转换模型具有较为满意的转换精度. 相似文献
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Most of the color image enhancement algorithms are implemented in two stages: gray scale image enhancement, which finds the target intensity, and then gamut mapping of the original color coordinates to the target. Therefore, hue preserving gamut mapping is an essential and crucial step, which influences colorfulness. In conventional color mapping methods, color saturation is reduced after intensity modification, which deteriorates subjective image quality. In this paper, a new color enhancement algorithm resulting in high color saturation is proposed. The proposed method employs multiplicative and additive color mapping to improve color saturation without clipping of a color component for increased target intensity as well as decreased cases. This new scheme is fast and effective, therefore, it can be employed to real time applications such as video signal processing. 相似文献
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针对白光二极管(LED)测试的实际需要,研究开发了TCS230高分辨率可编程颜色传感器,并结合了单片机89C2051的LED色差检测系统。给出了本检测系统的硬件设计电路及色差检测流程。测试表明,本系统实现了快速、准确、可靠的检测以及测试的数字化,而且使用便捷。 相似文献
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Image quality assessment (IQA) is a fundamental problem in image processing. While in practice almost all images are represented in the color format, most of the current IQA metrics are designed in gray-scale domain. Color influences the perception of image quality, especially in the case where images are subject to color distortions. With this consideration, this paper presents a novel color image quality index based on Sparse Representation and Reconstruction Residual (SRRR). An overcomplete color dictionary is first trained using natural color images. Then both reference and distorted images are represented using the color dictionary, based on which two feature maps are constructed to measure structure and color distortions in a holistic manner. With the consideration that the feature maps are insensitive to image contrast change, the reconstruction residuals are computed and used as a complementary feature. Additionally, luminance similarity is also incorporated to produce the overall quality score for color images. Experiments on public databases demonstrate that the proposed method achieves promising performance in evaluating traditional distortions, and it outperforms the existing metrics when used for quality evaluation of color-distorted images. 相似文献
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在彩色显象管生产过程中,荧光粉混色是影响正品率的主要原因之一。本文对产生混色的原因进行了分析,归纳出绿粉残留、偏移、覆盖和颗粒四种混色类型,并在计算机上进行模拟。同时提出了一种基于方向数组搜索的混色检测算法。最后在DPS-8/15中型计算机系统上进行仿真实验,其结果表明,该算法具有检测正确率高,抗噪声能力强,运算速度快等特点。 相似文献
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胆甾相液晶在彩色显示技术中的应用 总被引:10,自引:1,他引:9
胆甾相液晶分子呈螺旋结构,并且其螺距可以用加热冷却、光照和施加电场的方法进行可逆调整。这些性质使得其在彩色显示上具有巨大的应用前景,目前已经能够用胆甾相液晶做成各种彩色图案。为了探索实用的胆甾相液晶材料,人们制备并研究了各种结构和组成的胆甾相液晶,以及控制这些材料颜色的方法。 相似文献