用显示器测量人眼衬比度敏感函数

Measurement of Luminance Contrast Sensitivity Function of Human Visual System on Cathode Ray Tube Display

人眼视觉系统(HVS)特性是图像显示、处理和理解等理论与技术的重要依据,衬比度敏感函数(CSF)是描述视觉系统空间特性的主要指标之一。显示器作为图像信息输出的主要设备,显示器环境下人眼衬比度敏感函数数据更有实际应用价值。研究用阴极射线管(CRT)显示器测量人眼亮度衬比度敏感函数,详细描述采用10 bit图像显示卡产生亮度条纹衬比度达到人眼阈值的方法,提出采用多衬比度交互阈值确定(MITD)衬比度阈值的心理物理学实验方法。对矩形条纹的平均亮度10 cd/m26、0 cd/m29、0 cd/m2三个等级,0.41 cpd,0.82 cpd,1.23 cpd,1.97 cpd,3.08 cpd,3.79 cpd,4.93 cpd,7.04 cpd,9.86 cpd,16.43 cpd,24.64 cpd 11个空间频率和12名正常视力的青年进行了测量。测量结果与国内外采用光学装置方法测量结果进行了比较和讨论。

The characteristics of the human visual system （HVS） are the basis for image technology of display, processing and understanding, and the contrast sensitivity function （CSF） is one of important and special characteristics of HVS. CSF data under the computer display environment has practical applications to the image technologies. Luminance CSF was measured for square-wave patterns on a CRT display, and a psychophysical method for determination of contrast threshold ＂multi-contrast interactive threshold determination （MITD）＂ was presented and adopted. Measurements were done for three mean luminances of 10 cd/m^2, 60 cd/m^2, 90 cd/m^2 and eleven spatial frequencies of 0.41 cpd, 0.82 cpd, 1.23 cpd, 1.97 cpd, 3.08 cpd, 3.79 cpd, 4.93 cpd, 7.04 cpd, 9.86 cpd, 16.43 cpd, 24.64 cpd. Measurement results were compared with previous ones that had been measured with the optical apparatus.