Tree Image Growth Analysis Using Instantaneous Phase Modulation. (20th February 2011)

• Record Type: Journal Article
• Authors: Ramachandran Ramachandran, Janakiramanan Janakiramanan; Pattichis Pattichis, Marios S. Marios S.; Scuderi Scuderi, Louis A. Louis A.; Baba Baba, Justin S. Justin S.
• Other Names: Napolitano Napolitano Antonio Antonio Academic Editor.
• Is Part Of: EURASIP journal on advances in signal processing. Volume 2011(2011)
• Publication Date: 2011-02-20
• Subjects: Signal processing -- Periodicals; Traitement du signal; Signal processing; Periodicals; 621.3822
• DOI: 10.1155/2011/586865
• Languages: English
• ISSNs: 1687-6172

Abstract

Abstract : We propose the use of Amplitude-Modulation Frequency-Modulation (AM-FM) methods for tree growth analysis. Tree growth is modeled using phase modulation. For adapting AM-FM methods to different images, we introduce the use of fast filterbank filter coefficient computation based on piecewise linear polynomials and radial frequency magnitude estimation using integer-based Savitzky-Golay filters for derivative estimation. For a wide range of images, a simple filterbank design with only 4 channel filters is used. Filterbank specification is based on two different methods. For each input image, the FM image is estimated using dominant component analysis. A tree growth model is developed to characterize and depict quarterly and half-seasonal growth of trees using instantaneous phase. Qualitative evaluation of inter- and intraring reconstruction is performed on 20 aspen images and a mixture of 12 tree images of various types. Qualitative scores indicate that the results were mostly of good to excellent quality (4.4/5.0 and 4.0/5.0 for the two databases, resp.).