A note on luminance calibration of raster-scan cathode-ray tubes: Temporal resolution, ripple, and accuracy
A note on luminance calibration of raster-scan cathode-ray tubes: Temporal resolution, ripple, and accuracy
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DOI：
10.1163/156856897x00429
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发表时间：
1997-01-01
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影响因子：
--
通讯作者：
Bach, M
中科院分区：
文献类型：
--
作者：
Bach, M
准确的亮度校准是视觉研究中刺激的一个重要问题。光栅扫描阴极射线管呈现出亮度为10，000 cd m（-2）量级的快速扫描光点（实际值取决于视频定时和荧光体余辉）。在空间积分很小的情况下，这可能导致光度计的前级过载。更重要的是，即使在数百毫秒内平均，亮度信号的脉冲性质也会显着降低亮度测量的准确性。描述了一种帧同步光度计，以提高测量精度，同时仍然快速获取结果。
Accurate luminance calibration is an important issue for stimuli in vision research. Raster-scan cathode-ray tubes present a rapidly scanning spot with a luminance of the order of 10,000 cd m(-2) (the actual value depends on video timing and phosphor persistence). With little spatial integration this may result in overloading of the front stage of a photometer. More importantly, even if averaged over hundreds of milliseconds, the pulsed nature of the luminance signal will markedly reduce accuracy of the luminance measurement. A frame-synchronised photometer is described to increase measurement accuracy whilst still rapidly acquiring the result.