Computer aided target recognition (ATR) is introduced to reduce the false alarm rate (FAR) based on a pair of x-ray images. We assume that a homogeneous texture feature persists throughout the area of interest (AOI) in cases of contraband drug substances. We introduce an adaptive edge- texture wavelet transform (WT) in order to match the substance texture. Furthermore, we introduce a feature persistence measure in terms of a multi-resolution fractal dimension analysis. Results of an FPM plotted against the size of the box region show that the reflectance AOI is similar to the false contraband; but that of actransmitted AOI reveals a different fractal dimension between the positive and negative contrabands. Thus we can reduce the FAR.

Date Published: 3 April 1997
PDF: 12 pages
Proc. SPIE 3078, Wavelet Applications IV, (3 April 1997); doi: 10.1117/12.271738

Published in SPIE Proceedings Vol. 3078:
Wavelet Applications IV
Harold H. Szu, Editor(s)