1) Threshold image contrast enhancement
阈值对比度增强
2) contrast threshold
对比度阈值
1.
Object: To evaluate mesopic contrast threshold under 3 kinds of background and to explore the effect of adaptation time, adaptation luminance and glare on contrast threshold of human s eye.
目的评估3种背景环境下的中间视觉对比度阈值,并探讨暗适应时间、背景亮度和眩光对人眼对比度阈值的影响。
3) contrast detection threshold
对比度觉察阈值
1.
The goal gratings of five frequencies with different mean luminance were displayed on a CRT display,the contrast detection thresholds under different condition were measured for 9 young observers,and the curve reflecting the relationship between luminance and contrast detection threshold was obtained.
用CRT显示器显示5种频率的目标光栅,通过改变矩形波光栅的平均亮度,测量了9名男性青年在不同平均亮度条件下的对比度觉察阈值,并得出亮度与对比度觉察阈值间的关系曲线,从而探讨人眼在显示器亮度范围内的亮度视觉特性。
4) Image threshold contrast
图像阈值对比度
5) contrast threshold of human visual
视觉对比度阈值
1.
A smokescreen total obscure power(TOP) testing system,based on illumination measurement technology and contrast threshold of human visual is developed.
基于辐照度测量法和以人眼视觉对比度阈值为基准,研制了烟雾全遮蔽能力检测系统。
6) Contrast enhancement
对比度增强
1.
Contrast enhancement of medical ultrasonic images based on homogeneity measurement;
基于相似度测量的医学超声图像对比度增强
2.
Contrast enhancement method of medical ultrasonic images based on preserving brightness;
基于亮度不变的医学超声图像对比度增强方法
3.
Image contrast enhancement based on anisotropic diffusion equation;
基于各向异性扩散方程的图像对比度增强方法
补充资料：影像增强管对比度
影像增强管对比度
放射学术语。影像增强管的性能参数之一。影像增强管能发出的最大光强与不透X线的物体产生的占总面积100%的黑像区发出的光强之比。简单地说，影像增强管的对比度是对其初始背景的度量。影像增强管上初始背景本不该发光，但实际上均存在一定量的背景闪烁光。这种背景闪烁光类似X线散射，它可降低影像对比度，使低对比度的影像淹没。影像增强管的对比度愈高，背景闪烁愈低。一般DSA要求的影像增强管对比度为15∶1。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条