用手机拍摄电脑屏幕的时候,照片上会出现花纹,这种花纹叫「摩尔纹」,只要拍的时候把手机放在屏幕侧边,斜30°左右拍照,就不会出现这种花纹了。摩尔纹是一种在数码照相机或者扫描仪等设备上,感光元件出现的高频干扰的条纹,是一种会使图片出现彩色的高频率不规则的条纹。摩尔纹因为是不规则的,所以并没有明显的形状规律。当感光元件像素的空间频率与影像中条纹的空间频率接近时,可能产生一种新的波浪形的干扰图案,即所谓的摩尔纹。传感器的网格状纹理构成了一个这样的图案。当图案中的细条状结构与传感器的结构以小角度交叉时,这种效应也会在图像中产生明显的干扰。这种现象在一些细密纹理情况下,比如时尚摄影中的布料上,非常普遍。这种摩尔纹可能通过亮度也可能通过颜色来展现。消除这种干扰的措施匝是在传感器前使用抗混叠滤镜(也称为低通滤镜),然而这种滤镜会降低镜头的分辨率。因此,在这个问题上,必须要在摩尔纹以及分辨率之间做出取舍与妥协,不同型号相机的问题严重性不一,选择也不一样
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