Engineer Pedro Correa, from the UCL Telecommunications and Teledetection Laboratory, told SINC that, together with professor Ferran Marqués's unit at the UPC, they have developed algorithms that tackle the problem of gesture recognition “in the least invasive way possible, since it does not require wearing any special suit or receivers, using a simple video camera to film the body's movement”.
The images filmed identify the person's outline several dozens of times a second, and the data obtained are analyzed by the algorithm invented by the researchers to identify the “crucial points”: head, hands and feet. The “crucial points extraction algorithm” uses the mathematical concept of geodesic distance to calculate the person's extremities, “in other words”, clarifies Correa, “which points are furthest away from the center of gravity, following a path entirely within the outline”.
Once the extremities have been obtained, the outline is analyzed once again to create "morphological skeletons" that help assign a label to each extremity. The five possible labels are head, left hand, right hand, left foot and right foot. Once identified, they are represented with colored dots for tracking in 2 dimensions. This enables the user to analyze the results visually.
To obtain the same information in 3 dimensions, the same steps are taken with an additional camera. This way, the triangulation of the labels extracted in each of the two views makes it possible to obtain the points in a three dimensional space. The front view provides information on the vertical and horizontal positions of the extremities, and the side view provides information on their depth.
The low level of complexity in this system allows it to be applied in real time on any personal computer, with a margin of error of between 4% and 9% in real situations, depending on the context and the quality of the segmentation carried out.
Correa explained that the applications of this technique are “all those that require motion interaction with the computer; that is, from browsing through applications in an operating system (like moving windows and text with hand movements) to interactive aerobic video games, and much more”. The study was also participated in by a Belgian company specializing in real-size video games, which are used, for example, in amusement parks and museums.
SINC Team | alfa
New AI system manages road infrastructure via Google Street View
19.06.2019 | RMIT University
'Alexa, monitor my heart': Researchers develop first contactless cardiac arrest AI system for smart speakers
19.06.2019 | University of Washington
The quality of additively manufactured components depends not only on the manufacturing process, but also on the inline process control. The process control ensures a reliable coating process because it detects deviations from the target geometry immediately. At LASER World of PHOTONICS 2019, the Fraunhofer Institute for Laser Technology ILT will be demonstrating how well bi-directional sensor technology can already be used for Laser Material Deposition (LMD) in combination with commercial optics at booth A2.431.
Fraunhofer ILT has been developing optical sensor technology specifically for production measurement technology for around 10 years. In particular, its »bd-1«...
The well-known representation of chemical elements is just one example of how objects can be arranged and classified
The periodic table of elements that most chemistry books depict is only one special case. This tabular overview of the chemical elements, which goes back to...
Light can be used not only to measure materials’ properties, but also to change them. Especially interesting are those cases in which the function of a material can be modified, such as its ability to conduct electricity or to store information in its magnetic state. A team led by Andrea Cavalleri from the Max Planck Institute for the Structure and Dynamics of Matter in Hamburg used terahertz frequency light pulses to transform a non-ferroelectric material into a ferroelectric one.
Ferroelectricity is a state in which the constituent lattice “looks” in one specific direction, forming a macroscopic electrical polarisation. The ability to...
Researchers at TU Graz calculate the most accurate gravity field determination of the Earth using 1.16 billion satellite measurements. This yields valuable knowledge for climate research.
The Earth’s gravity fluctuates from place to place. Geodesists use this phenomenon to observe geodynamic and climatological processes. Using...
Discovery by Brazilian and US researchers could change the classification of two species, which appear more akin to jellyfish than was thought.
The tube anemone Isarachnanthus nocturnus is only 15 cm long but has the largest mitochondrial genome of any animal sequenced to date, with 80,923 base pairs....
29.04.2019 | Event News
17.04.2019 | Event News
15.04.2019 | Event News
19.06.2019 | Physics and Astronomy
19.06.2019 | Information Technology
19.06.2019 | Materials Sciences