Instrumentos musicais são geralmente pesquisados sob uma ótica eurocêntrica, que os observa enquanto objetos fixos e padronizados, a partir de aspectos físicos sobretudo visíveis, compara instrumentos tidos como padrão oriundos da música concerto europeia. Tendo mote principal investigação viola machete do samba roda, este artigo cruza registros históricos iconográficos presença africanos no Br...

We present a real-time system for face detection, tracking and characterisation from omni-directional video. Viola-Jones is used as a basis for face detection, then various filters are applied to eliminate false positives. Gaps between two detection of a face by the Viola-Jones algorithms are filled using a colour-based tracking. This system reliably detects more than 97% of the faces across se...

We study the problem of traffic sign detection in the context of traffic infrastructure inventory. The data acquired during filming the roads in Croatia is presented. Based on recent approaches, and motivated by constraints present in our data, we employ the Viola-Jones object detector for triangular warning signs detection. The detector achieves correct detection rates better than 90%, which i...

We here propose improved version of elastic graph matching (EGM) as a face detector, called the multi-scale EGM (MS-EGM). In this improvement, Gabor wavelet-based pyramid reduces computational complexity for the feature representation often used in the conventional EGM, but preserving a critical amount of information about an image. The MS-EGM gives us higher detection performance than Viola-Jo...

Face detection algorithm based on a cascade of ensembles of decision trees (CEDT) is presented. The new approach allows detecting faces other than the front position through the use of multiple classifiers. Each classifier is trained for a specific range of angles of the rotation head. The results showed a high rate of productivity for CEDT on images with standard size. The algorithm increases ...

Medicinal plant contains matter that can be used for therapeutic reason or which are precursors for the production of useful drugs. Very few and periodic works are there in the literature regarding the phytochemistry and TLC of Viola odorata L. TLC profiling of plant extract gives an idea about the presence of various phytochemicals. Different Rf (Retention factor) value of various phytochemica...

Face detection is a canonical example of a rare event detection problem, in which target patterns occur with much lower frequency than nontargets. Out of millions of face-sized windows in an input image, for example, only a few will typically contain a face. Viola and Jones recently proposed a cascade architecture for face detection which successfully addresses the rare event nature of the task...

Terrestrial red beds have long been interpreted as desert deposits by comparison with modern red deserts. More recently red beds have been interpreted as evidence of seasonally dry conditions and a Permo–Triassic Pangean monsoon. Red beds of Cala Viola, Sardinia are identified as paleosols and used to reconstruct Late Permian paleoclimatic conditions. Reconstruction of paleoenvironmental condit...

In this paper, we present the architecture of a Video-on-Demand system called VIOLA. This system exhibits two distinctive features not found in other Video-on-Demand systems, namely scalability, and fault tolerance. System scalability is achieved through a novel Server Array architecture in which video data are distributed among an array of servers. This allows one to scale up the system capaci...

We here propose improved version of elastic graph matching (EGM) as a face detector, called the multi-scale EGM (MS-EGM). In this improvement, Gabor wavelet-based pyramid reduces computational complexity for the feature representation often used in the conventional EGM, but preserving a critical amount of information about an image. The MS-EGM gives us higher detection performance than Viola-Jo...