Title :
Film digitization aliasing artifacts caused by grid line patterns
Author :
Wang, Jun ; Huang, H.K.
Author_Institution :
Dept. of Radiol. Sci., California Univ., Los Angeles, CA, USA
fDate :
6/1/1994 12:00:00 AM
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
Keywords :
analogue-digital conversion; diagnostic radiography; medical image processing; Moire pattern; digitizer laser spot size; film digitization aliasing artifacts; grid line patterns; image quality; mathematical model; medical diagnostic imaging; radiographic film sampling; sampling direction; Biomedical imaging; Digital images; Fourier transforms; Frequency; Image quality; Image sampling; Image storage; Medical diagnostic imaging; Radiology; Sampling methods;
Journal_Title :
Medical Imaging, IEEE Transactions on