“半影”怎么读

另外, 提出了亮度步长的方法来检测阴影中的半影.In additional, the luminance step is applied to detect the penumbra.通过甲苯胺蓝染色、焦油紫染色并利用图像分析仪测量半影区面积.The area of the penumbra was measured and analyzed with an image analysis system....

“半影”的英语可以翻译为：[物] penumbra，half image，half shadow ...