Wavelet-enhanced appearance modeling

Mikkel B. Stegmann; Soren Forchhammer; Timothy F. Cootes

doi:10.1117/12.535797

Abstract

Generative segmentation methods such as the Active Appearance Models (AAM) establish dense correspondences by modelling variation of shape and pixel intensities. Alas, for 3D and high-resolution 2D images typical in medical imaging, this approach is rendered infeasible due to excessive storage and computational requirements. This paper extends the previous work of Wolstenholme and Taylor where Haar wavelet coefficient subsets were modelled rather than pixel intensities. In addition to a detailed review of the method and a discussion of the integration into an AAM-framework, we demonstrate that the more recent bi-orthogonal CDF 9-7 wavelet offers advantages over the traditional Haar wavelet in terms of synthesis quality and accuracy. Further, we demonstrate that the inherent frequency separation in wavelets allows for simple band-pass filtering, e.g. edge-emphasis. Experiments using Haar and CDF 9-7 wavelets on face images have shown that segmentation accuracy degrades gracefully with increasing compression ratio. Further, a proposed weighting scheme emphasizing edges was shown to be significantly more accurate at compression ratio 1:1, than a conventional AAM. At higher compression ratios the scheme offered both a decrease in complexity and an increase in segmentation accuracy.

Citation Download Citation

Mikkel B. Stegmann, Mikkel B. Stegmann, Soren Forchhammer, Soren Forchhammer, Timothy F. Cootes, Timothy F. Cootes, "Wavelet-enhanced appearance modeling", Proc. SPIE 5370, Medical Imaging 2004: Image Processing, (12 May 2004); doi: 10.1117/12.535797; https://doi.org/10.1117/12.535797

ACCESS THE FULL ARTICLE

PERSONAL SIGN IN
Full access may be available with your subscription

Email or Username Forgot your username?

Password Forgot your password?

Show

Remember Email/Username on this computer

Remember Password

No SPIE account? Create an account
or Institutional Sign In via Shibboleth

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $14.40

Non-members: $18.00 ADD TO CART

Show All Keywords

Keywords/Phrases

Search In:

Publication Years