什么是加权图象，英语怎么翻译

加权均值滤波器减少微光电视图象噪声
微光夜视设备的象管在进行图象信息转换和增强时，将伴随附加噪声，使输出图象恶化。本文在分析象管产生噪声的基础上设计了加权均值滤波器，有效提高输出图象的分辨率和微光电视的识别、观察距离。
The image quality will become worsen for the append noisiness when it be translated and strengthened with the image tube of shimmer night viewing device．This paper firstly analyses the noisiness which is created by the image tube，then offers the design of weighted mean filter，with it，the output image？s resolution and the distance which can be recognized and observed with LLTV can be raised effectively．