vignetting

Some Influencing imaging quality factors of this inspector are analyzed from theory to experiment, and corresponding calibration methods are put forward, including CCD dark current nonuniformity, CCD photon response nonuniformity, vignetting effect of optical system, converting screen nonuniformity of response to X-ray radiation.

分析了内视仪中影响成像质量的各个因素的特性，提出了相应的校正方法。包括CCD暗电流不一致性，CCD光响应不一致性，光学系统渐晕，转换屏对射线响应不一致性。

Using dual galvanometer optical scanning head as the reflecting type optic fiber confocal scanning microscope's scanning outfit can achieve the fast scanning to plane image, but there exists distortion and vignetting.

以双振镜光学扫描头作为反射式光纤共焦扫描显微镜的平面扫描机构可以实现对平面图像的快速扫描，但存在着畸变和渐晕问题。

The brightness and contrast of scenery which are observed by thermal imager are always very low, so the effect of vignetting on the performance of thermal imager is high.

热像仪观察的景物亮度或对比度通常很低，所以渐晕对热像仪性能的影响显得比较严重。