Stereo vision for robotic applications in the presence of non-ideal lighting conditions

Many robotic and machine-vision applications rely on the accurate results of stereo correspondence algorithms. However, difficult environmental conditions, such as differentiations in illumination depending on the viewpoint, heavily affect the stereo algorithms’ performance. This work proposes a new illumination-invariant dissimilarity measure in order to substitute the established intensity-based ones. The proposed measure can be adopted by almost any of the existing stereo algorithms, enhancing it with its robust features. The performance of the dissimilarity measure is validated through experimentation with a new adaptive support weight (ASW) stereo correspondence algorithm. Experimental results for a variety of lighting conditions are gathered and compared to those of intensity-based algorithms. The algorithm using the proposed dissimilarity measure outperforms all the other examined algorithms, exhibiting tolerance to illumination differentiations and robust behavior.     

The impact of drying and steaming processes on surface color changes of tension and normal beech wood

Abstract

Beech wood has a high frequency of defects such as red heartwood, reaction wood (tension wood). For the experimental measurements four logs without visible defects like red heartwood, which can noticeably affects the measurements' results were qualified. The drying medium temperature in the first phase of the process before the moisture content of the specimens fell below the FSP was maintained at 45?°C. Then, the temperature was gradually increased to the maximum value 65?°C. The results showed that different initial wood moisture content does not affect to final value of tension and normal wood. The colorimetric parameter L* was much higher for tension wood. After steaming, there were greater differences in the colorimetric parameters, respectively, a* and b*. After drying the difference of all colorimetric parameters between tension and normal wood was significantly less. The color changes were only noticed in the surface layers of specimens. Differences were small, and thus, the impact of the tension wood on the color changes was not confirmed. However, since the lightness of tension wood plays a key role for its visual detection, it may be adequate to only measure the lightness parameter (L*).     

Practical application of the “turbid water” flag in ocean color imagery: Interference with sun-glint contaminated pixels in open ocean

A simple method to identify turbid, sediment-loaded, waters within satellite ocean color imageries was recently proposed (A. Morel and S. Bélanger, Remote Sensing of Environment, 102, (2006), 237-249). Systematic application of this method to the level-3 composites obtained from three ocean color sensors shows that the “turbid” flag is often raised in the open ocean, especially in the sub-tropical oligotrophic gyres, where turbidity is unlikely. In addition these flagged zones migrate with season, and clearly follow the sun declination course. The combination of low chlorophyll waters with a residual sun-glint is at the origin of this artifact. Simple approaches for eliminating such a misleading detection are proposed. The identification and elimination of the bias are also needed in particular for an unambiguous detection of the presence of calcite (coccolithophores) in open waters.     

The influence of unilateral acceleration on color‐gamut properties of a TFT‐LCD

Abstract— This letter describes experiments in which a TFT‐LCD was exposed to unilateral acceleration amplitudes of different temporal profiles and durations. The results show that the color gamut is extended by increasing the load amplitude. Following the loading, the color gamut recedes and gradually approaches the reference range.     

精细网印中的故障排除

在精细网印中影响印刷清晰度的因素很多，克服网线对图文的干扰，是精细网印工作者必须研究的课题。从专色印刷中网线对图文的阻挡、精细网目调印刷网点的丢失、精细网印宜用UV油墨三个方面进行了详细地分析，供参考。     

宽屏幕彩电中的压缩技术

对现有１６：９宽屏幕彩电在接收４：３宽高比图像出现的水平失真现象，提出了一种实用的数字压缩技术，将亮度信号（Ｙ）、二个色差信号（Ｒ－Ｙ、Ｂ－Ｙ）进行数字化处理，按一定规则在存贮器中实现对信号的存取，实现图像在时间轴上的压缩，解决了图像的水平失真问题．文中在理论分析的基础上给出了实用的电路原理图．     

C9深色石油树脂生产工艺及技术改造

文章介绍了广东新华粤石化股份有限公司石油树脂厂生产C9深色石油树脂生产工艺及为了生产较高软化点的C9深色石油树脂，保生产后路畅通，对生产深色树脂汽提系统进行真空改造的情况。通过对改造效果、操作条件、产酿质量指标定位等进行对比分析，寻找到了一条提高产品产量和质量的有效途径。     

刺葡萄皮色素色价测定及提取工艺研究

对湖南湘西刺葡萄及新疆的巨峰、红提两个葡萄品种的果皮进行了色价测定和对照，研究了刺葡萄皮色素的最佳提取工艺，结果表明：湘西刺葡萄皮的色价远高于对照品种，其色价是巨峰葡萄皮的21．75倍，红提葡萄皮的2．87倍；得出刺葡萄皮色素提取的最佳工艺条件为：以1．5mol／L的盐酸-95％乙醇（v/v=3：17）混合液为提取剂，提取时间为100min，提取温度为50℃，物料比为1：20（g／mL）。     

钢铁防腐与彩色热镀锌工艺

概述了钢铁防腐的各种方法，着重阐述了热镀锌工艺的发展历史与现状，彩色涂层钢板的发展历史与存在 的问题，并介绍了彩色热镀锌工艺的优点和国内外的研究情况，彩色热镀锌钢板在研究和开发中存在的问题，指出在热镀锌工业中的重要性及发展前景。     

润湿剂对乳胶漆展色的影响因素探讨

根据润湿剂对颜填料的润湿分散作用,利用比重法、粘度法、色差值等方法得出如何有针对性地选择润湿剂来充分体现色浆在涂料中的展色作用。