An image pre-processing techniques based on Wiener filter and normalization of image brightness is proposed for weaken the influence of periodic noise and brightnessvariation.
提出维纳滤波与亮度归一化相结合的图像预处理技术，去除固定模式噪声和亮度变化的影响。
2
The variation of brightness and chromaticity of output image with modulation depth in phase-modulated colour encoding image is investigated.
本文讨论了位相调制彩色编码输出图象的色度、亮度随调制深度变化的规律。
3
The variation of the polarization brightness of coronal streamer in Carrington Rotations 1591-1592 is investigated.