【摘 要】
:
Clromatic sensitivity along the protan, deutan, and tritan lines and the loci of the unique hues (red, green, yellow, blue) for a very large sample (n = 185) of colour-normal observers ranging from 18 to 75 years of age are assessed. Visual judgments are
【机 构】
:
UniversityofLiverpool,Liverpool,UKComputerVisionCentre,Barcelona,Spain
【出 处】
:
ChineseOpticsLetters
论文部分内容阅读
Clromatic sensitivity along the protan, deutan, and tritan lines and the loci of the unique hues (red, green, yellow, blue) for a very large sample (n = 185) of colour-normal observers ranging from 18 to 75 years of age are assessed. Visual judgments are obtained under normal viewing conditions using colour patches on self-luminous display under controlled adaptation conditions. Trivector discrimination thresholds show an increase as a function of age along the protan, deutan, and tritan axes, with the largest increase present along the tritan line, less pronounced shifts in unique hue settings are also observed. Based on the chromatic (protan, deutan, tritan) thresholds and using scaled cone signals, we predict the unique hue changes with ageing. A dependency on age for unique red and unique yellow for predicted hue angle is found. We conclude that the chromatic sensitivity deteriorates significantly with age, whereas the appearance of unique hues is much less affected, remaining almost constant despite the known changes in the ocular media.
其他文献
Breast cancer is one of the leading causes of cancer-related deaths in a global scenario. In the present study, biochemical changes exerted upon Pentoxifylline (PTX) treatment had been appraised in human breast cancer cells using Raman spectroscopy. There
Laser cooling of mechanical degrees of freedom is one of the most significant achievements in the field of optomechanics. Here, we report, for the first time to the best of our knowledge, efficient passive optomechanical cooling of the motion of a freesta
针对雷达微动手势识别中的回波信噪比低、数据量大、特征可解释性差的问题,提出了一种基于随机森林的超宽带雷达微动手势识别系统。微动手势雷达截面积小,进而导致信噪比低、正向特征模糊等问题。针对这些问题,采用聚类算法提取回波主向量并构建多项式特征,以减少冗余数据,提高手势回波信噪比。对于训练过程中特征图谱可解释性破坏的问题,采用随机森林可视化特征贡献率并以此选择特征应用于模型。实验结果表明,在不同底噪的回波信号下,该算法相比于其他算法具有更好的识别性能,这验证了算法的有效性。
The line of sight (LOS) wind velocity can be determined from the incoherent Doppler lidar backscattering signals. Noise and interference in the measurement greatly degrade the inversion accuracy. In this paper, we apply the discrete wavelet denoising meth
To simultaneously obtain high-resolution multi-wavelength (from visible to near infrared) tomographic images of the solar atmosphere, a high-performance multi-wavelength optical filter has to be used in solar imaging telescopes. In this Letter, the fabric
为提高字符发生器数据处理能力和笔划书写性能,设计一种新型笔划式字符发生器。采用具有双处理器双总线的DSP作为主处理器,采用FPGA集成矢量发生器。利用DSP的握手式DMA通道,加上矢量指令管理单元的时序配合,完成矢量发生器对矢量指令的自主申请和获取,实现字符发生器数据处理与笔划书写的并行管理,提高字符发生器的平均书写速度和笔划书写均匀性。着重介绍字符发生器的组成、工作原理、工作流程及矢量指令管理单元的时序设计。
We propose dynamic terahertz (THz) emission microscopy (DTEM) to visualize temporal–spatial dynamics of photoexcited carriers in electronic materials. DTEM utilizes THz pulses emitted from a sample by probe pulses irradiated after pump pulse irradiation t
用激光诱发荧光的方法研究了单支线TEA CO2激光解离CCl3F所产生的CClF和C2自由基的电子激发态辐射寿命及自由基浓度的时间特性。