IEEE
Trans. Circuits & Systems II: Analog & Digital Signal Processing,
vol. 46, no. 1, pp. 78-80, Jan. 1999
Progressive Switching Median Filter for the Removal
of Impulse Noise from Highly Corrupted Images
1Dept. of Computer Science, City University
of Hong Kong, Hong Kong, China
2 Dept. of Communication & Electronic
Engineering, South China Univ. of Tech., Guangzhou, China
Abstract: A new
median-based filter, progressive switching median (PSM) filter, is proposed to
restore images corrupted by salt-pepper impulse noise. The algorithm is
developed by the following two main points: 1) switching scheme-an impulse
detection algorithm is used before filtering, thus only a proportion of all the
pixels will be filtered; and 2) progressive methods-both the impulse detection
and the noise filtering procedures are progressively applied through several
iterations. Simulation results demonstrate that the proposed algorithm is
better than traditional median-based filters and is particularly effective for
the cases where the images are very highly corrupted.
Index Terms: median filters; progressive switching
median filter; impulse noise removal; highly corrupted images; median-based
filter; restored images; salt-pepper impulse noise; switching scheme; impulse
detection algorithm; progressive methods; noise filtering procedures