Detection of symmetry and anti-symmetry

Detection of symmetry and anti-symmetry

To assess the role of second-order channels in symmetry perception we measured the effects of check size, spatial frequency content, eccentricity and grey scale range on the detection of symmetrical and anti-symmetrical patterns. Thresholds for symmetrical stimuli were only moderately affected by these manipulations. Anti-symmetrical stimuli composed of large black and white checks elicited low...

Symmetry of Fullerene C_60

M.CHO, K.M.LEE: BILATERAL SYMMETRY DETECTION VIA SYMMETRY-GROWING 1 Bilateral Symmetry Detection via Symmetry-Growing

We present a novel and robust method for localizing and segmenting bilaterally symmetric patterns from real-world images. On the basis of symmetrically matched pairs of local features, our method expands and merges confident local symmetric region matches by exploiting both photometric similarity and geometric consistency via our new symmetry-growing framework. It overcomes the limitations of t...

Bilateral Symmetry Detection via Symmetry-Growing

A variety of symmetries occur in nature, living organisms, and manufactured artifacts, and provide humans with pre-attentive cues that enhance object recognition. Despite the long history of the research, the recent performance evaluation [6] shows that we are still short of a robust and widely applicable symmetry detector. The symmetry detection methods can be broadly classified into global an...

On Symmetry of Some Nano Structures

It is necessary to generate the automorphism group of a chemical graph in computer-aided structure elucidation. An Euclidean graph associated with a molecule is defined by a weighted graph with adjacency matrix M = [dij], where for i≠j, dij is the Euclidean distance between the nuclei i and j. In this matrix dii can be taken as zero if all the nuclei are equivalent. Otherwise, one may introduce...