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灰色背景
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  gray background
     Image division by the character of θ can filter the background which is very different from skin color, but it cannot divide skin from the purple hair and gray background.
     以相位角θ为特征进行图像分割可以去掉与肤色在色调上有较大区别的背景,但该肤色模型难以把肤色与棕色头发或灰色背景分开。
短句来源
     The color difference between metal ceramic restorations and A2 shade slice was the smallest in gray background.
     在灰色背景下金瓷修复体与比色片的色度差最小。
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  相似匹配句对
     Background:Cerebral infarction is a common cerebrovascular disease with high morbidity and mortality.
     背景
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     BACKGROUND
     背景
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     Colorful Shades of Gray
     绚烂的灰色
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     Grey Analysis for Ecology Background of Soil Enzymatic Activities in Cropland
     农田土壤酶活性生态背景灰色分析
短句来源
     Petrochemistry and tectonic background of the gray gneisses in north Dabie terrane
     北大别灰色片麻岩的岩石化学特征及大地构造背景
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  gray background
The key features of the system were stimuli color desaturation, low-level luminance and equiluminant gray background.
      
After each image presentation, a red crosshair appeared for 5 s on a gray background.
      
Amino acid residues that are conserved in all members are on gray background.
      
Amino acids identical with those in ACEII are indicated with a gray background.
      
Amino acid sequences confirmed by partial sequencing of the serpins purified from wheat grain are shown with a gray background.
      
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In this experiment four types of lighting sources with differentcolour rendering properties are used in turn to illuminate two kindsof visual task separately. The visual acuity under each condition has been measured andcalculated. It is found that raising the colour rendering index of thelighting source could increase the visual discrimination effect in reco-gnizing the black signs against coloured background; while decreasingit in recognizing the coloured signs against grey background. These eff-ects are mainly...

In this experiment four types of lighting sources with differentcolour rendering properties are used in turn to illuminate two kindsof visual task separately. The visual acuity under each condition has been measured andcalculated. It is found that raising the colour rendering index of thelighting source could increase the visual discrimination effect in reco-gnizing the black signs against coloured background; while decreasingit in recognizing the coloured signs against grey background. These eff-ects are mainly the results of the function of luminance contrast betweenthe details and the corresponding backgrounds under different lightingsources. The results agree with the relationship of V=f(c) which isbased on the visual performance of human observers. Besides, it showsthat the coloured details against grey background are better definedthan the black detail against coloured background in visual discrimin-ation, and the colour contrast plays an important role in advancingvisual acuity. It is proved that the high pressure sodium lamp (HPSL)is one of the best lighting sources for the former sign pattern in raisingvisual acuity and saving electric energy in spite of. its lower colourrendering property.

本实验采用四种不同显色特性的光源分别作为两种类型视标的照明。在同一照度上对各照明条件下的视觉敏度予以测定和计算。结果表明:增加光源显色指数对于颜色背景上黑色视标的辨认能力有所提高;而对于中灰色背景上颜色视标的辨认能力则有所下降。这种效果主要是由于在不同光源照明下,视标与背景的亮度对比变化所致。结果还表明:使用中灰背景颜色视标在辨认效果上优于颜色背景黑视标。对前一类型视标采用高压钠灯照明有助于提高视觉辨别力。这对推广应用这种显色指数较低,但光效率较高的新光源有实际意义。

Objective To study the color difference of metal ceramic restorations and VITA shade guide in three different backgrounds.Methods In the same condition,CIE1976L*a*b* color system,a digital camera,a computer and a standard light source were selected to measure and compare the characteristics of A2 shade slice in the shade guide and two types of metal ceramic restorations.Result To the same type of metal ceramic restorations,the color difference was larger than 1.5NBS in three different backgrounds.The color difference...

Objective To study the color difference of metal ceramic restorations and VITA shade guide in three different backgrounds.Methods In the same condition,CIE1976L*a*b* color system,a digital camera,a computer and a standard light source were selected to measure and compare the characteristics of A2 shade slice in the shade guide and two types of metal ceramic restorations.Result To the same type of metal ceramic restorations,the color difference was larger than 1.5NBS in three different backgrounds.The color difference between metal ceramic restorations and A2 shade slice was the smallest in gray background.Conclusions Color differences were found between the shade guide and metal ceramic restorations in different backgrounds.The color of metal porcelain crowns in gray background was better than that in black and red backgrounds.

目的比较3种不同背景下金瓷修复体之间及其与Vitapanclassical比色板的色彩差异。方法应用CIE1976L*a*b*颜色系统,采用高像素数码摄影及计算机处理技术,在标准光源及相同条件下,采集了2组金瓷修复体的12个试件与6个A2比色片的图片,分别测量、分析其色度值。结果同种金瓷修复体在3种不同背景之间的色度差明显大于1.5NBS;在灰色背景下金瓷修复体与比色片的色度差最小。结论3种不同背景下金瓷修复体之间及其与VITA比色板存在肉眼可见的颜色差异,灰色背景要优于其他两种。

 
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