Many imaging applications deal with the detection of small targets or spots embedded within an inhomogeneous background. We present a method that accomplishes a multiresolution detection on the wavelet-transformed image. The targets are separated from the background by the exploitation of Renyi’s information, which is evaluated at the different decomposition levels of the wavelet transform. The scale-dependent candidate detections are successively combined by means of majority voting for final detection. Connections with results provided in different fields such as multifractal analysis, generalized information measures in scale-space, and cross-entropy analysis in fine-to-coarse transformations are discussed. Detection performance is investigated through an example from medical image analysis.
© 2000 Optical Society of America
Giuseppe Boccignone, Angelo Chianese, and Antonio Picariello, "Multiresolution spot detection by means of entropy thresholding," J. Opt. Soc. Am. A 17, 1160-1171 (2000)