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Affine invariant 2D recognition in grain classification

Novakova K., Kukal J.

Archives of Control Sciences

2007

Vol. 17, no. 2

135-144

Invariant recognition of 2D binary image often arises from image moments. They enable the construction of affine transform, which ensures the invariance to translation, scaling, first rotation and stretching of the image. It is a problem to ensure the invariance to the second rotation. The paper deals with two methods how to realize the affine invariant recognition system with the numerical stable elimination of the second rotation. Modified images are obtained via polar or Radon's transform. Mentioned two approaches enable affine invariant systems construction and they were used for analysis of particles in granular mixtures. The affine invariant system is applied to detail analysis of fertilizer grains.

Cladoceran fauna from the archeological site vladar in Czech Republic

Novakova K.

Studia Quaternaria

2005

Vol. 22

51-54

The study described in this paper is a part of a multi-proxy project, which deals with sediments originating from a former artificial water reservoir situated at the large fortified hilltop site of Vladao. The oldest sediments were deposited around 350 BC and sedimentation continues till recent times. Number of palaeoecological analyses have been applied (pollen, macroremains, charcoal, wood, Cyanobacteria, algae, fungi, Cladocera, chemical elements, radiocarbon dating, archaeological artefact). The present contribution deals with analysis of chitinous fragments of Cladocera found within the trench. The results of this study clearly suggest a connection between the influence of human activity on the hilltop and the trophic status of the water in the cistern. Some phases of increased water eutrophication were distinguished on the basis of Cladocera species preferring nutrient rich water (Chydorus sphaericus, Bosmina longirostris).