由于网格线图案导致的胶片数字化伪影。

Film digitization aliasing artifacts caused by grid line patterns.

机构信息

Dept. of Radiol. Sci., California Univ., Los Angeles, CA.

出版信息

IEEE Trans Med Imaging. 1994;13(2):375-85. doi: 10.1109/42.293930.

Abstract

Sampling a radiographic film containing grid line patterns during digitization may produce aliasing artifacts (Moire pattern). The authors propose a mathematical model based on the laser spot size of the digitizer, the distance and the angle between the grid line and the sampling direction to predict the amplitudes and the frequencies of aliasing artifacts. The predicted results are compared to the experimental results. Effective ways of avoiding or reducing aliasing artifacts without sacrificing too much image quality are proposed.

摘要

在数字化过程中对含有栅格线图案的射线照片进行采样可能会产生混叠伪像（莫尔图案）。作者提出了一种基于数字化仪激光光斑尺寸、栅格线与采样方向之间的距离和角度的数学模型，用于预测混叠伪像的幅度和频率。将预测结果与实验结果进行了比较。提出了在不牺牲太多图像质量的情况下有效避免或减少混叠伪像的方法。