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Hand gesture recognition based on free-form contours and probabilistic inference

100%

Kasprzak W., Wilkowski A., Czapnik K.

International Journal of Applied Mathematics and Computer Science

2012

tom 22

nr 2

437-448

A computer vision system is described that captures color image sequences, detects and recognizes static hand poses (i.e., "letters") and interprets pose sequences in terms of gestures (i.e., "words"). The hand object is detected with a double-active contour-based method. A tracking of the hand pose in a short sequence allows detecting "modified poses", like diacritic letters in national alphabets. The static hand pose set corresponds to hand signs of a thumb alphabet. Finally, by tracking hand poses in a longer image sequence, the pose sequence is interpreted in terms of gestures. Dynamic Bayesian models and their inference methods (particle filter and Viterbi search) are applied at this stage, allowing a bi-driven control of the entire system.

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Efficient generation of 3D surfel maps using RGB-D sensors

100%

Wilkowski A., Kornuta T., Stefańczyk M., Kasprzak W.

International Journal of Applied Mathematics and Computer Science

2016

tom 26

nr 1

99-122

The article focuses on the problem of building dense 3D occupancy maps using commercial RGB-D sensors and the SLAM approach. In particular, it addresses the problem of 3D map representations, which must be able both to store millions of points and to offer efficient update mechanisms. The proposed solution consists of two such key elements, visual odometry and surfel-based mapping, but it contains substantial improvements: storing the surfel maps in octree form and utilizing a frustum culling-based method to accelerate the map update step. The performed experiments verify the usefulness and efficiency of the developed system.

Ograniczanie wyników

2 International Journal of Applied Mathematics and Computer Science

2 Kasprzak W.

2 Wilkowski A.

1 Czapnik K.

1 Kornuta T.

1 Stefańczyk M.

1 2016

1 2012

Wyniki wyszukiwania

Hand gesture recognition based on free-form contours and probabilistic inference

Efficient generation of 3D surfel maps using RGB-D sensors