A.D. Calway and R. Wilson, "A unified approach to feature extraction based on an invertible image transform", Proc. 3rd IEE Int. Conf. Image Processing, Warwick, 1989. Home/Search Document Not in Database Summary Related Articles Check |
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Incorporating Orientation Selectivity in Wavelet Transforms for.. - Calway (1995) Self-citation (Calway) (Correct)
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A.D. Calway and R. Wilson, "A unified approach to feature extraction based on an invertible image transform", Proc. 3rd IEE Int. Conf. Image Processing, Warwick, 1989.
Curve Extraction in Images Using the Multiresolution.. - A. Calway, R. Wilson (1994) Self-citation (Calway Wilson) (Correct)
....assumes the image to consist of a set of line and edge features defined at different spatial resolutions. The estimator is implemented by making use of the multiresolution Fourier transform (MFT) 3] an invertible transform that has been shown to be useful for a variety of image analysis problems [4, 5]. A curve representation is defined within the image model and a hierarchical extraction process is used to identify the curves. Results are presented for a natural image. Presented at the IEEE Int. Conf. on Acoustics, Speech and Signal Processing, Albuquerque, NM, 1990 2 A Multiresolution ....
....estimation of three parameters for each feature: its scale index n, its orientation nxy and its offset j nxy . These are obtained from the original image by using a combined estimation decision procedure. A brief outline of the scheme is provided here, a more detailed description can be found in [4, 5]. 3.1 Local Feature Modelling and Estimation The estimation at a given scale index n is based upon a frequency domain model of oriented, localised features such as lines and edges. These features are characterised by a concentration of energy in the Fourier transform along a line passing through ....
A.Calway, R.Wilson, A Unified Approach to Feature Extraction Based on an Invertible Image Transform, Proc. 3rd IEE Int. Conf. Image Processing, 651-655, Warwick, 1989.
Image Analysis Using a Generalised Wavelet Transform - Calway (1993) Self-citation (Calway) (Correct)
....of the frequency domain at each scale and hence enabling regions to be analysed over a range of frequencies, yielding a flexibility not possessed by existing WTs. This has allowed the MFT to be used as the basis for tackling a wide range of problems, including linear feature and curve extraction [7] [10] texture analysis [11] and stereopsis [12] and hence provides a framework for a unified approach to image analysis. The Multiresolution Fourier Transform It is simplest to describe the transform in terms of the 1 d continuous case. For a given scale oe, the MFT of the 1 d signal x( at ....
....models are valid. This has the advantage of being both efficient and sufficiently general to be applicable in a wide range of problems. Specific examples are described briefly below. Linear Features and Curves. The initial application of the MFT was in the extraction of linear features and curves [7] [10] The scheme follows closely that of the two component procedure detailed above: a frequency domain model and estimator based on the linear phase properties of line and edge segments; and a top down selection procedure defined within the quadtree framework which identifies the largest regions ....
A.D. Calway and R. Wilson, "A unified approach to feature extraction based on an invertible image transform", Proc. IEE Int. Conf. on Image Process. and its Appl., pp. 651-655, Warwick, England, 1989.
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