背景亮度

为了有效将JND和视频编码结合，论文考虑在象素域中进行JND建模，因此选用背景亮度子模型和纹理掩膜子模型计算JND。

To efficiently use JND to improve the coding performance , we model the JND in pixel domain , so wer choose background luminance sub-model and texture mask sub-model .

并通过对不同背景亮度等级的划分，确定了不同背景亮度等级下不同照明效果的亮度值。

Moreover , according to divide different background luminance ranks , provides luminance values in the different lighting effects .

平显PDU光学系统下组合玻璃镀负滤光膜对字符、背景亮度的影响

Effect of HUD combiner negative filtering coating on the brightness of symbology and background

VDT作业中屏面背景亮度与对比度的交互作用CRT显示颜色编码与色标大小、亮度关系的实验研究

Relationship Between VDT Performance and Luminance Contrast at Different Levels of Background Luminance on Sereen THE EFFECTS OF TARGET SIZE AND LUMINANCE ON COLOUR CODING IN A CRT DISPLAY

四.建议以下几种情况下，植物不适宜白光LED照明：①植物表面反射率低于0.05时；②背景亮度大于1cd/m~2时；②植物在秋冬季节改变时。

We recommend plants not suitable for lighting in the following case : ( 1 ) plant surface reflectivity is lower than 0.05 ; ( 2 ) the background brightness is higher than 1 cd / m ~ 2 ; ( 3 ) plant in autumn and winter seasons change .

提出了基于MORTRAN软件的修正完善方法，建立了全天空背景亮度数据；

Based on the MORTRAN software , a corrected method to consummate the all-sky background brightness is given .

本文提出了一个用于图象边缘检测的视觉模型和对数域的最大块梯度（LMGG）算法，它们能自适应地表达人眼在不同背景亮度下的最小分辨力，并以此阀值进行图象的边缘检测。

This paper presents a visual perception model and an adaptive algorithm called maximum group gradient on the field of logarithm ( LMGG ) for image edge detection .

建立了LBS-1型立靶精度测量系统中的天幕靶，对天幕靶探测性能存在的各种影响因素，如：光电转换接收器件及其探测电路、天空背景亮度的强弱等进行了分析。

A LBS-1 fire accuracy measurement system was set up . Influence factors including detection circuit of photo-electricity transforming and accepting , and brightness of sky background , were analyzed .

多路输出结构中各路输出的暗电流偏差，使器件的成像背景亮度一致性差。

The deviation of dark current to multi-output leads to bad output uniformity .

球后视神经炎不同背景亮度中心视野损害的探讨

On Central Visual Field Defects with Different Background Illumination on Axis Retrobulbar Neuritis

背景亮度及眩光对夜航船舶避碰的影响

Influence of background brightness and dazzle on collision avoidance of night navigation ships

暗适应时间、背景亮度和眩光对人眼对比度阈值影响的探讨

The Effect of Adaptation Time , Adaptation Luminance and Glare on Contrast of Human 's Eye

天空背景亮度的观测

Brightness of the sky background

第一种方式是：在没有铁磨粒情况下采集背景亮度变化，通过数字处理得到背景亮度变化的差值，然后将亮度补偿到铁谱图上。

For the first method , the uneven background brightness distributing was compensated by collecting background brightness of ferrography image .

本研究的目的是考察辨认颜色灯光信号的亮度对比阈与背景亮度的关系。

Two experiments were carried out to investigate the relation between back - ground brightness and contrast threshold in identifying coloured light signals .

而传统的检测方法利用目标点亮度值与背景亮度值不同进行目标与背景的分离，因此本方法更能体现目标与背景的差异，在强杂波背景中实现高效的检测。

So this method can reflect the difference between targets and background better and high-efficiency detection in the strong clutter background can be performed .

由视觉可靠性的要求，分析了阈对比和背景亮度之间的关系；

In view of the requirement of sight reliability , the relationship between contrast and the threshold of contrast of light 's brightness is analyzed .

目的探讨在常规主觉验光环境下，暗适应造成的双眼前视标背景亮度差异的持续时间。

Objective To evaluate the lasting time of background luminance difference of the fixation target between two eyes because of dark adaptation under routine subjective refraction .

首先选择大小合适的两邻域，通过计算两个邻域的方差增长数值来而不是熵增长值来进行目标检测和定位，同时解决了邻域熵进行目标检测受背景亮度影响的问题。

First two suitable neighborhoods are selected , then the value of variance increasing is calculated , other than entropy , to detect and locate target .

对于海面图像，分别采用感兴趣舰船目标区域的方差值、目标和背景亮度对比度这两个特征对目标进行融合识别。

As to sea image , the variance feature of region of interest and the luminance contrast feature between target and background are used to fusion recognition .

水印强度与图像背景亮度及纹理强度成正比，使水印对原始图像具有自适应性。

The intensity of watermark is proportional to the intensity of texture and brightness of the image , which makes the watermark be adapted to the original image .

该算法利用视觉系统的背景亮度、纹理和边界掩盖特性把载体图像的小波系数分为18类；

This arithmetic divides the wavelet coefficients of carrier image into 18 classes by the background luminance , the texture and the edge mask character of visual system ;

泊松抠像方法假定前景、背景亮度光滑变化，把梯度作为抠像保持特征，易产生模糊细节，需多次局部操作细化抠像。

Poisson matting assumes that foreground and background are smooth , and take the gradient as the matting features , but it require the additional local operations to refine the result .

这两种算法可以区分在四个不同的背景亮度（暗，暗淡，正常和明亮）条件下的火焰与非火焰之间的特性像素。

Both algorithms can distinguish well between the fire and non-fire objects as the detection of fire character pixels is considered under the four different background lights : dark , dim , normal and bright .

利用人眼视觉系统对背景亮度和纹理的掩盖特性，对小波变换后的系数进行分类，分类的结果是基于图像特征的。

According to the background luminance and the texture mask characters of HVS the wavelet coefficients of carrier image is divided into different classes , and the classing result is based on the character of the image .

倍频视野计对传统自动静态视野计出现的暗点的预测性本文对28例60眼球后视神经炎，采用不同背景亮度的两种自动静态视野计进行了对比检测。

Prediction of future scotoma on conventional automated static perimetry using frequency doubling technology perimetry A controlled study with static perimetry of different background illumination was done in 38 eases ( 60 eyes ), with axis retrobulbar neuritis .

另外，目标物呈现的时间长短、观察者年龄和负对比（目标物亮度小于背景亮度）修正对可见度也有一定的影响。

Moreover , it is the amendment of the duration of a target , the age of observer and negative contrast ( the brightness of targets is smaller than that of background ) that have a certain impact on the visibility .

本文首次在实验室内，从环境心理学角度出发，模拟动态光环境下，背景亮度、距离/立体角和刺激速度三因素的组合和交叉变化对人的视觉感知的影响。

From the perspective of environmental psychology , this thesis firstly simulated dynamic light environment in the laboratory and researched influences of combination and intersection of three factors ( namely background brightness , distance / solid angle and stimulating speed ) on visual perception .

本文分析了可见度的影响因素以及可见度设计的发展过程，指出了影响可见度水平的主要因素有目标物的亮度、紧邻的背景亮度、邻近环境的适应水平和失能眩光；

This article analyses the influence factors of visibility and development process of visibility design , points out the main factors of influencing the visibility level , such as the target brightness , the immediate background brightness , environment brightness level and disfunctional glare .

通过对大量实测数据的回归分析，拟合出不同实验条件下反应时间与背景亮度的函数表达式，从而得出金卤光源视觉功效高于钠灯光源的结论。

Through regression analysis of the massive measured data , the reaction time and the background brightness function expression has been fitted under the different experimental condition , thus obtains the golden halogen photosource vision effect to be higher than the sodium lamp photosource the conclusion .