Non-linearities in cortical simple cells and the possible detection of zero crossings
Biological Cybernetics
Modelling the negotiation paradigm for the banking industry
Computers in Industry
Vision: A Computational Investigation into the Human Representation and Processing of Visual Information
Image and Vision Computing
How the brain might work: a hierarchical and temporal model for learning and recognition
How the brain might work: a hierarchical and temporal model for learning and recognition
Computer vision-based human body segmentation and posture estimation
IEEE Transactions on Systems, Man, and Cybernetics, Part A: Systems and Humans - Special section: Best papers from the 2007 biometrics: Theory, applications, and systems (BTAS 07) conference
The possible mechanism underlying visual anti-camouflage: a model and its real-time simulation
IEEE Transactions on Systems, Man, and Cybernetics, Part A: Systems and Humans
Shape partitioning by convexity
IEEE Transactions on Systems, Man, and Cybernetics, Part A: Systems and Humans
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The excitatory-inhibitory visual receptive-field model may be looked upon as a classical structuralist approach to vision that relies upon brightness-contrast information of the image as a preliminary step toward visual representation. The corresponding mathematical operator (Laplacian) was first proposed by the empiricist Ernst Mach on the basis of the Mach band illusion. The Helmholtz's constructivist approach, on the other hand, argues that perception is the product of unconscious inference. Propagating a sort of intermediate stance between these two viewpoints led to the emergence of the Gestalt school for whom perception follows a minimum principle and is at the same time holistic, based on certain coherence criteria. In this paper, we have modeled the extra classical receptive field through an eigenfunction-based generalization of the Gaussian derivative approach that resulted in a modification of Mach's equation, introducing a higher order isotropic derivative (Bi-Laplacian) of Gaussian and a fourth-moment operator. The proposed computational model draws its inspiration from the structuralist approach, performs figure-ground segregation in Gestalt sense, and also provides cues toward brightness perception in tune with the constructivist notion of unconscious inference.