Title :
Detection of the presence of aliasing in digital image sequences
Author :
Cohen, Boaz ; Dinstein, Its´Hak
Author_Institution :
Dept. of Electr. & Comput. Eng., Ben-Gurion Univ. of the Negev, Beer-Sheva, Israel
fDate :
6/23/1905 12:00:00 AM
Abstract :
Resolution enhancement of an image from a sequence of digital images is possible only if aliasing effects are present. We address the issue of detecting presence of aliasing within a digital image sequence. Given two digital images of the same scene with sub-pixel relative translation between them, we examine the absolute difference between the interpolated versions of these images. If the two images contain no aliasing effects, the difference between them will be random, solely due to noise. If aliasing is present, the difference between the two interpolated images will be highly correlated to the high-frequency elements of each interpolated image. An algorithm for the detection of the presence of aliasing based on this phenomenon is proposed. This algorithm is also able to estimate the extent of aliasing
Keywords :
image enhancement; image resolution; image sequences; interpolation; aliasing detection algorithm; artificial down-sampling; digital image sequences; high-frequency elements; image resolution enhancement; interpolated images; noise; sub-pixel relative translation; Additive noise; Cutoff frequency; Digital images; Electronic mail; Fourier transforms; Image reconstruction; Image resolution; Image sampling; Layout; Optical sensors;
Conference_Titel :
Image Processing, 2001. Proceedings. 2001 International Conference on
Print_ISBN :
0-7803-6725-1
DOI :
10.1109/ICIP.2001.959125
