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575
The "Independent Components" of Natural Scenes are Edge Filters
, 1997
"... It has previously been suggested that neurons with line and edge selectivities found in primary visual cortex of cats and monkeys form a sparse, distributed representation of natural scenes, and it has been reasoned that such responses should emerge from an unsupervised learning algorithm that attem ..."
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Cited by 617 (29 self)
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that attempts to find a factorial code of independent visual features. We show here that a new unsupervised learning algorithm based on information maximization, a nonlinear "infomax" network, when applied to an ensemble of natural scenes produces sets of visual filters that are localized and oriented
Spatiotemporal energy models for the Perception of Motion
 J. OPT. SOC. AM. A
, 1985
"... A motion sequence may be represented as a single pattern in xyt space; a velocity of motion corresponds to a threedimensional orientation in this space. Motion sinformation can be extracted by a system that responds to the oriented spatiotemporal energy. We discuss a class of models for human mot ..."
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Cited by 904 (9 self)
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motion mechanisms in which the first stage consists of linear filters that are oriented in spacetime and tuned in spatial frequency. The outputs of quadrature pairs of such filters are squared and summed to give a measure of motion energy. These responses are then fed into an opponent stage. Energy
A theory for multiresolution signal decomposition : the wavelet representation
 IEEE Transaction on Pattern Analysis and Machine Intelligence
, 1989
"... AbstractMultiresolution representations are very effective for analyzing the information content of images. We study the properties of the operator which approximates a signal at a given resolution. We show that the difference of information between the approximation of a signal at the resolutions ..."
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Cited by 3538 (12 self)
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multiresolution representation called a wavelet representation. It is computed with a pyramidal algorithm based on convolutions with quadrature mirror lilters. For images, the wavelet representation differentiates several spatial orientations. We study the application of this representation to data compression
A Quadrature Filter Approach for Registration Accuracy Assessment of Fundus Images
"... Abstract. This paper presents a method to automatically assess the accuracy of image registration. It is applicable to images in which vessels are the main landmarks such as fundus images and angiography. The method simultaneously exploits not only the position, but also the intensity profile acro ..."
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across the vasculatures. The accuracy measure is defined as the energy of the odd component of the 1D vessel profile in the difference image divided by the total energy of the corresponding vessels in the constituting images. Scale and orientationselective quadrature filter banks have been employed
3DOrientation space; filters and sampling
 SCIA 2003. LNCS
, 2003
"... The orientation space transform is a concept that can deal with multiple oriented structures at a single location. In this paper we extend the orientation space transform to 3D images producing a 5D orientation space (x, y, z, # , # ). We employ a tunable, orientation selective quadrature filter to ..."
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Cited by 2 (0 self)
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The orientation space transform is a concept that can deal with multiple oriented structures at a single location. In this paper we extend the orientation space transform to 3D images producing a 5D orientation space (x, y, z, # , # ). We employ a tunable, orientation selective quadrature filter
Quadrature filters
, 2005
"... Bandpass quadrature filters represent popular means in computer vision for estimating local multiscale image information, such as the energy, phase, (radial) frequency and orientation/angular frequency. This note reviews the mathematical properties of quadrature filters in continuous space. In pra ..."
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Bandpass quadrature filters represent popular means in computer vision for estimating local multiscale image information, such as the energy, phase, (radial) frequency and orientation/angular frequency. This note reviews the mathematical properties of quadrature filters in continuous space
Subband Image Coding with Hexagonal Quadrature Mirror Filters
 in Picture Coding Symposium
, 1990
"... seband filter H(!) is that expression (1) have a value of unity for all !. Finally, these systems may be cascaded uniformly or nonuniformly (to form pyramid structures). Unlike traditional Gaussian or Laplacian pyramids, the representation is not overcomplete and may contain oriented subbands. We ..."
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Cited by 2 (0 self)
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seband filter H(!) is that expression (1) have a value of unity for all !. Finally, these systems may be cascaded uniformly or nonuniformly (to form pyramid structures). Unlike traditional Gaussian or Laplacian pyramids, the representation is not overcomplete and may contain oriented subbands. We
NonSeparable Extensions of Quadrature Mirror Filters to Multiple Dimensions
"... Quadrature Mirror Filter (QMF) banks have been used in a variety of onedimensional signal processing applications, and have been applied separably in two dimensions. As with most onedimensional filters, separable extension to multiple dimensions produces a transform in which the orientation select ..."
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Quadrature Mirror Filter (QMF) banks have been used in a variety of onedimensional signal processing applications, and have been applied separably in two dimensions. As with most onedimensional filters, separable extension to multiple dimensions produces a transform in which the orientation
The multidimensional isotropic generalization of quadrature filters in geometric algebra
 IN PROC. INT. WORKSHOP ON ALGEBRAIC FRAMES FOR THE PERCEPTIONACTION CYCLE
, 2000
"... In signal processing, the approach of the analytic signal is a capable and often used method. For signals of finite length, quadrature filters yield a bandpass filtered approximation of the analytic signal. In the case of multidimensional signals, the quadrature filters can only be applied with res ..."
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Cited by 14 (7 self)
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In signal processing, the approach of the analytic signal is a capable and often used method. For signals of finite length, quadrature filters yield a bandpass filtered approximation of the analytic signal. In the case of multidimensional signals, the quadrature filters can only be applied
Ndimensional orientation estimation using quadrature filters and tensor whitening
 In Proceedings of IEEE International Conference on Acoustics, Speech, & Signal Processing
, 1994
"... In this paper it is shown how estimates of local structure and orientation can be obtained using a set of spherically separable quadrature lters. The method is applicable to signals of any dimensionality the only requirement being that the lter set spans the corresponding orientation space. The esti ..."
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Cited by 15 (4 self)
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In this paper it is shown how estimates of local structure and orientation can be obtained using a set of spherically separable quadrature lters. The method is applicable to signals of any dimensionality the only requirement being that the lter set spans the corresponding orientation space
Results 1  10
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