共查询到20条相似文献，搜索用时 31 毫秒
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Alan M. Gundelfinger 《Journal of The Franklin Institute》1934,218(4):505-506
A spectrophotometric method of determining total visual transmission and visual density of non-neutral light filters is described. In addition, this method is utilized in determining density and gamma intensification produced by tones in color motion picture work and the importance of intensification control is emphasized. 相似文献
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A new process is described which we have named “Ferrography.” The process enables graphic information to be recorded on magnetic materials and to be reproduced on paper in visual form. Magnetic inks are available in black or colors, enabling monochrome or color reproductions to be made. The magnetic matrix may be used repeatedly so that multiple printing is possible, and the matrix may be stored indefinitely. The process has advantages: economy and speed of operation, permanence of image, and ability to record any information which is available in signal form, such as instrument data, facsimile transmission, or scanned images. 相似文献
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烟叶人工分级易受主观因素影响,分级结果存在主观差异性,需要建立与人眼视觉感受相吻合的客观分级方法。本文针对烟叶颜色属性进行分级判断,给出一种基于CIEDE2000的均匀色差颜色分级方法。该方法包含了亮度、色调和饱和度综合色差视觉感受的图像评价标准,将待测烟叶与标准烟叶库中所有标准烟叶分别做色差计算,根据距离准则,寻找与当前待测烟叶色差最小的标准烟叶,同时对这个最小距离进行阈值判定,来确定当前待测烟叶的等级。实验结果表明根据CIEDE2000色差公式的颜色分级方法优于RGB颜色分级方法,与人眼视觉感受更为吻合,为建立烟叶自动分级系统提供了新的依据。 相似文献
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分析了电力系统通信网的主要特点,介绍了光纤通信的波分复用和光栅型波分复用器的工作原理,对电力通信中光纤通信的应用状况进行了概括,最后对电力系统中光纤通信网的发展做了展望。 相似文献
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Orthogonal electrodes have been reported to produce high velocity microflows when excited by ac signals, showing potential for micropumping applications. This paper investigates the microflow reversal phenomena in such orthogonal electrode micropumps. Three types of microflow fields were observed by changing the applied electric signals. Three ac electrokinetic processes, capacitive electrode polarization, Faradaic polarization, and the ac electrothermal effect, are proposed to explain the different flow patterns, respectively. The hypotheses were corroborated by impedance analysis, numerical simulations, and velocity measurements. The investigation of microflow reversal can improve the understanding of ac electrokinetics and hence effectively manipulate fluids. 相似文献
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在当今的市场上,色彩的运用在各个领域表现非常突出。色彩可以表现品牌的独特个性,并给消费者留下深刻的印象。本文分析了色彩的感情规律、心理感觉和视觉感,应用色彩的暖色、冷色等搭配,并结合实例说明色彩在品牌推广中的重要性和引导力,力图运用色彩的特性创新品牌形象,引导消费者将其作为首选产品,提高品牌市场竞争力,推动企业的创新和发展。 相似文献
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本文基于有限元分析方法,采用适合中、小型光学元件的周边支撑结构形式,进行了某星载温室气体探测仪大平面反射式闪耀光栅支撑结构的设计。通过对光栅组件进行有限元建模,以及固有模态、静力学、动力学、光机热集成分析,优化了支撑结构设计,使得光栅组件基频〉300Hz,在±5℃均匀温度变化和1g重力耦合作用下,光栅刻划表面波前面形精度仍符合光学设计要求。最终工程分析结果表明：大平面反射式闪耀光栅的支撑结构设计是合理的,光栅组件固有一阶频率高,抗重力变形能力、抗震性能均能满足仪器总体设计指标要求,通过选用不同热膨胀系数的结构材料及合理设计零件配合尺寸等消热设计手段有效抑制了光栅支撑结构的变形对光栅结构的扭曲作用。 相似文献
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提出一种新的显示立体图像的方法,用计算机制作随机条形散斑体视对,利用其衍射和人眼的双目辐合来综合立体图,本方法为动态立体显示、彩色立体显示以及实际不存在物体的显示提供了可行的手段,也为研究人的视觉机理提供了一个有效的工具. 相似文献
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Noriaki Suetake Go Tanaka Hayato Hashii Eiji Uchino 《Journal of The Franklin Institute》2012,349(6):2093-2107
In comparison with the people having the normal color vision, the people with color vision impairment such as dichromats have the difficulty to distinguish the colors in certain combinations. This may pose an impediment of the visual communication in the recent wide spreading of the use of colors. In order to address this problem, in this paper, we propose a novel lightness modification method to improve the visibility of the color image for the color vision impaired. In the proposed method, the lightness modification is only carried out around contours of objects to realize the Craik–O'Brien effect, which is an perceptual illusion of the contrast, for dichromats. Furthermore, in the proposed method, it is tried to preserve the impression given by original color image by lessening the change of the color as possible while providing the perceptible and comprehensible color image for dichromats. Through some examples, the effectiveness and the validity of the proposed method are verified. 相似文献
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传统彩色图像的直方图检索技术基于RGB空间,但研究发现,RGB空间不符合人眼的视觉感应。因此本文提出的算法是在HSV空间上计算彩色图像的三维直方图,通过非均匀的划分三个分量色相H(Hue)、饱和度S(Saturation)和亮度V(Value)的采样区间,得到不同的检索结果。实验结果分析表明,在HSV空间,不同的分量在不同类型的图像中的作用是不一致的。 相似文献
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《Information processing & management》2020,57(3):102190
Social networking tools such as Facebook, YouTube, Twitter, and Instagram, are becoming major platforms for communication. YouTube as one of the primary video sharing platform serves over 100 million distinct videos, 300 hours of videos are uploaded on YouTube every minute along with textual data. This massive amount of multimedia data needs to be managed with high efficiency, the irrelevant and redundant data needs to be removed. Video summarization ideals with the problem of redundant data in a video. A summarized video contains the most distinct frames which are termed as key frames. Most of the research work on key frames extraction considers only a single visual feature which is not sufficient for capturing the full pictorial details and hence affecting the quality of video summary generated. So there is a need to explore multiple visual features for key frames extraction. In this research work a key frame extraction technique based upon fusion of four visual features namely: correlation of RGB color channels, color histogram, mutual information and moments of inertia is proposed. Kohonen Self Organizing map as a clustering approach is used to find the most representative frames from the list of frames coming after fusion. Useless frames are discarded and frames having maximum Euclidean distance within a cluster are selected as final key frames. The results of the proposed technique are compared with the existing video summarization techniques: User generated summary, Video SUMMarization (VSUMM), and Video Key Frame Extraction through Dynamic Delaunay Clustering (VKEDDCSC) which shows a considerable improvement in terms of fidelity and Shot Reconstruction Degree (SRD) score. 相似文献
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主要研究了视频图像目标跟踪准确性问题。在基于核的颜色特征统计描述及以此建立视觉目标观测概率方法的基础上,提出了一种改进的粒子滤波视频图像目标跟踪算法。首先,本文给出了基于标准粒子滤波的单特征、单目标跟踪算法,然后针对加权样本参数的选择不同,提出改进思路,最后通过与基于均值移位视觉目标跟踪算法的实验结果对比。提出的改进的粒子滤波跟踪算法在稳健性方面有显著地提高,而且若适当选择视觉跟踪参数,在实时性方面能得到有效地保证。 相似文献
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色彩是商业摄影画面最基本的表达语言,是情感的语言,可以广泛地渲染画面的气氛,让受众在视觉和知觉中被吸引的同时并引起情感反应。而运用饱和度高的色彩能增强画面视觉冲击力,引用社会的流行色彩和商业元素增强画面的时尚感和设计感,让人在感叹色彩魅力的同时吸引人们有消费的欲望。饱和度高的色彩的应用较难把握,运用不当有俗气和过度粉饰的媚态,色彩要合理、确切,强调与产品广告意念相吻合,还要注意整体画面和谐美感,饱和度高的色彩应如何搭配使用这成为一个关键点。 相似文献
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We propose in this paper an architecture for near-duplicate video detection based on: (i) index and query signature based structures integrating temporal and perceptual visual features and (ii) a matching framework computing the logical inference between index and query documents. As far as indexing is concerned, instead of concatenating low-level visual features in high-dimensional spaces which results in curse of dimensionality and redundancy issues, we adopt a perceptual symbolic representation based on color and texture concepts. For matching, we propose to instantiate a retrieval model based on logical inference through the coupling of an N-gram sliding window process and theoretically-sound lattice-based structures. The techniques we cover are robust and insensitive to general video editing and/or degradation, making it ideal for re-broadcasted video search. Experiments are carried out on large quantities of video data collected from the TRECVID 02, 03 and 04 collections and real-world video broadcasts recorded from two German TV stations. An empirical comparison over two state-of-the-art dynamic programming techniques is encouraging and demonstrates the advantage and feasibility of our method. 相似文献
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现有众多电子图书版权系统不能较好权衡用户初步预览功能与电子图书版权保护之间的矛盾。在充分利用电子图书视觉特性的基础上,提出面向电子图书的可逆可见水印方案。该方案在保护电子图书版权的同时,可提供用户预订与预览功能,仅授权用户可去除可见水印而获得高清电子图书,其可较好地应用于数字图书馆中电子图书的版权保护与安全流通。 相似文献