Boon and bane of curvelet transform

Abstract

Candes and Donoho introduced a new system of multiresolution analysis called the curvelet transform. Curvelets take the form of basis elements, which exhibit a very high directional sensitivity and are highly anisotropic. In this paper, we applied the curvelet transform, to generate Tamil OCR, to detect melanoma from microscopic images and to develop a stego system. Curvelet transform is a threat to the security of web applications where Image CAPTCHAs are used to dintinguish man from bots. © 2010 Springer-Verlag Berlin Heidelberg.