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Michael Brill has opened a valuable discussion about camera gamuts and Roy Berns has questioned the use of the word “gamut” in that proposal. We would like to stress the importance of associating a gamut with an imaging output device and would thus question the use of the concept proposed for assessing the capabilities of an input device. © 2007 Wiley Periodicals, Inc. Col Res Appl, 33, 81–82, 2008 相似文献
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For digital camera-based spectra recovery, the spectral reflectance of the object being imaged always needs to be accurately recovered using training samples from available database. Considering the heavy workload when using all samples in database as training samples in practice, a new representative samples selection method is proposed for efficient digital camera-based spectra recovery based on single RGB image. The representative simulation system is firstly constructed through correlation analysis of spectra recovery results of different systems, and based on the representative simulation system, a few number of representative samples are selected from the database based on minimum of the defined simulate spectra recovery error. The effectiveness of the proposed method is evaluated and compared with existing method. As the results show, the proposed method outperforms the existing methods, and the robustness of the selected representative samples is consistent with the database in practical applications. 相似文献
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In this article, a dual seven-primary lighting system is constructed for color research and education. The system offers sufficient spectral variability to approximate the spectral power distribution of a variety of standard illuminants. More importantly, the constructed multiprimary lighting system was verified to have crucial advantages over conventional displays/projectors to probe observer metamerism through the generation of individualized metameric color stimuli. An observer metamerism index to describe the potential for observer metamerism of any generated stimulus pairs with respect to the population variation of color-normal observers is formulated. The metric is further extended for use in quantifying the potential for observer metamerism of any lighting system or a system-primary combination. Moreover, 10 pairs of lighting stimuli, customized for exhibiting high degrees of observer variability, were produced using the system as a step toward creating a device for the color matching functions characterization of individual observers, a so-called observer calibrator. 相似文献
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CMOS图像传感器是数字图像技术系统的核心器件 ,是继CCD图像传感器问世 30年后的又一产品。分析了CMOS图像传感器的工作原理及其性能特点并与CCD图像传感器结构、内部特性、工艺、成本等作了系统的比较。 相似文献
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数码图像的噪点及控制 总被引：1，自引：0，他引：1
本文首先分析了数码图像噪点的类型,提出了容易产生噪点的各种拍摄条件,并指出了有效控制噪点的方法。希望能够为大家正确地选择和使用数码相机提供帮助。 相似文献
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详细论述了数码照相机中CCD光电传感器工作时的信号贮存、转移和读取原理,同时阐述了行间转移和帧转移结构面阵CCD的一般工作过程。 相似文献
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Christian Hopmann Nadine Magura Nicolas Rozo Lopez Daniel Schneider Kai Fischer 《Polymer Engineering and Science》2021,61(5):1353-1367
Wet filament winding technology has been extensively used for the manufacture of rotationally symmetric parts made of fiber-reinforced plastics (FRP). As the design and modeling of FRP-parts require numerous assumptions, deviations between calculated and achieved mechanical properties are expected. One aspect that contributes to this discrepancy is the assumption of a homogeneous rectangular cross-section of the fiber-band. In this work, the fiber-band geometry in a wet-winding process of carbon fiber cylinders is analyzed. An Infrared-optical system for the detection of the fiber bandwidth and winding-angle is implemented. The influence of the winding speed and the resin temperature is analyzed. An image processing algorithm for the automatic measurement of the fiber's bandwidth and winding-angle is developed. Manual and adaptive gamma corrections are implemented to improve image quality. A parameter study for the suitable selection of image processing parameters is performed. 相似文献
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Hyla Allouche-Arnon Nishanth D. Tirukoti Amnon Bar-Shir 《Israel journal of chemistry》2017,57(9):843-853
Although much is known about the diverse roles of metal ions in biology, most of the acquired knowledge was obtained with fluorescent dyes or electrophysiological approaches. However, the ability to non-invasively monitor variation in metal ions and to assess their physiological distribution in health and disease is very limited. Recent advances in the field of molecular magnetic resonance imaging (MRI) have offered new capabilities through the design and development of MRI-responsive sensors for a wide range of applications, including the ability to sense and spatially map metal ions. Here, we briefly summarize the recent progress in the development and performance of MRI sensors designed to monitor metal ions in biology while emphasizing their in vivo uses, their limitations, and remaining challenges. Among the proposed MRI-sensors, Zn2+ and Ca2+ responsive agents are those that have already been used in live intact subjects, and therefore, these will be emphasized here. 相似文献
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Principal component analysis (PCA) has been widely studied for reconstruction of spectral reflectance of a color sample from its tristimulus values. One of the most important factors that influences the recovery performance is the characteristic of the data set used for obtaining principal vectors. In this article, we investigated the influence of color similarities or color differences between the recovered and principal component (PC) data sets on the reconstruction error. For this purpose, two metamer sets that have similar color differences with the recovered samples, are used. The results show that two metamer sets can make completely different performance in recovery of specific color samples. It was shown that the most important factor that influences the recovery of spectral reflectance by PCA method is the characteristics of the data set used for obtaining PC vectors independent of the recovered samples. Another factor that influences the performance of PCA for spectral recovery is the characteristic of the sample that would be recovered. Some spectral data cannot be recovered precisely even applying different PC data sets. © 2010 Wiley Periodicals, Inc. Col Res Appl, 2011 相似文献
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A. Cartellier 《化学工程与技术》2001,24(5):535-538
Concentration, velocity, size and interfacial area density are key parameters in the design of multiphase processes involving bubbles or droplets. Optical probes provide a relatively simple and cheap mean to measure these quantities. In this paper, recent advances in probe design and signal processing are summarized, and the performances of these systems are discussed. Finally, various applications are presented and known limitations of the technique are underlined. 相似文献
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Surface engineering of nanoparticles controls the interaction of these materials with proteins and other biomolecules. These interactions provide an important tool for integrating synthetic and biological systems. We will discuss the use of nanoparticles to modulate the structure and function of proteins, the self-assembly of proteins and nanoparticles to create multifunctional materials, and the construction of nanoparticle-based sensors for the detection and identification of proteins and cells. 相似文献
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The determination of the colour gamuts of colour reproduction media is an important aspect of both understanding them in isolation and using them in the context of a colour reproduction system. Although this is well understood for output colour reproduction media, a solution for input media is not to be had in a simple way. To this end, in this article, we propose a method based on simulating the responses of an input medium to given spectral power distributions. We then determine the gamut of an input medium on the basis of having a set of spectra that covers the majority of all possible spectra, knowing a medium's quantized responses to them, and then determining a boundary beyond which the medium does not produce variation in its responses. © 2002 Wiley Periodicals, Inc. Col Res Appl, 28, 59–68, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/col. 相似文献
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谷忠昭 《感光科学与光化学》2003,21(5):357-376
接着以前的几篇文章，作者从光吸收、潜影形成效率、最小潜影中心的尺寸以及材料储存期的稳定性角度，分析了卤化银感光材料已达到的性能现状．潜影形成的效率取决于由吸收的光子产生的量子产率、敏化中心对电子的俘获和光电子与正空穴间的复合．可以肯定，感光材料的性能提高尚有很大的余地．依据上述的考察及其与静态数字照相的比较，可预测未来世界的卤化银感光材料生产的发展会趋缓．有一点应清楚，感光科学与技术彼此间已互动促进了许多年，生产出了高精细、高复杂的感光材料，此类科学与技术不是一些后来者能轻而易举超越的，而且它们所取得的各项进展无不依赖于感光科学和技术学会的种种活动． 相似文献
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Jost CA Reither G Hoffmann C Schultz C 《Chembiochem : a European journal of chemical biology》2008,9(9):1379-1384
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数码相机后盖注射模设计 总被引：4，自引：0，他引：4
分析了数码相机后盖塑料件的工艺特点,介绍了数码相机后盖注射模结构设计和工作过程.该模具采用滑块成型塑料件的侧孔,斜销成型塑料件内部表面的倒扣,用限位螺钉、限位拉杆和尼龙开闭器实现顺序开模和定距.生产实践表明,该模具结构合理,运行可靠. 相似文献