Papers by Rodrigo Schramm
Este trabalho se insere no curso de Licenciatura em Música EAD da UFRGS, auxiliando no processo d... more Este trabalho se insere no curso de Licenciatura em Música EAD da UFRGS, auxiliando no processo de ensino-aprendizagem dos alunos por intermédio de novos materiais didáticos. O uso de ferramentas audiovisuais, especialmente as videoaulas, é uma realidade desde a década de 1980, porém, foi com o surgimento da internet, que se tornou possível a veiculação dessas mídias aos mais diferentes e distantes pontos de nosso país. A utilização do vídeo é importante, pois possibilita a visualização de conteúdos impossíveis de serem representados por uma linguagem apenas textual. Contudo, a utilização da videoaula com seu conteúdo em forma apenas expositiva não gera motivação de estudo por parte do aluno. Visando resolver esse problema, o projeto propõe a criação de um Vídeo Interativo de Aprendizagem -ViA, que permita a visualização e o acompanhamento de videoaulas de maneira interativa. Diferente de uma videoaula tradicional, que possui uma "timeline engessada", o ViA propõe o desenvolvimento de uma "timeline dinâmica" onde, de acordo com as escolhas que são tomadas durante o processo de navegação do vídeo, o sistema direciona o aluno baseado em regras pré-estabelecidas no roteiro geral. Além disso, o ViA permite que os passos do aluno, incluindo navegação e interação com questionários, sejam registrados na plataforma virtual de aprendizagem, possibilitando a avaliação. A metodologia de construção de um ViA baseia-se em: criação de roteiro e definição de regras para navegação, inserção de menus interativos, integração das sequências, persistência de dados, testagem e publicação no Ambiente Virtual de Aprendizagem. Por intermédio da utilização do ViA, espera-se que o aluno tenha um maior interesse no estudo dos conteúdos. Como avaliação, será efetuada uma análise preliminar tanto da satisfação quanto do rendimento dos envolvidos para verificar a validade da ferramenta. Com vistas a, na continuidade, verificar formalmente tais resultados, mediante projetos de pesquisa específicos. Um protótipo de ViA está disponível em http://prolicenmus.ufrgs.br/repositorio/ViA.
2014 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 2014
ABSTRACT This paper explores a simple yet effective way to generate temporally coherent disparity... more ABSTRACT This paper explores a simple yet effective way to generate temporally coherent disparity maps from binocular video sequences based on kinematic constraints. Given the disparity map at a certain frame, the proposed approach computes the set of possible disparity values for each pixel in the subsequent frame, assuming a maximum displacement constraint (in world coordinates) allowed for each object. These disparity sets are then used to guide the stereo matching procedure in the subsequent frame, generating a temporally coherent disparity map. Experimental results indicate that the proposed approach produces temporally coherent disparity maps comparable to or better than competitive methods.
This work describes a new approach to gesture mapping in a
performance with a traditional musica... more This work describes a new approach to gesture mapping in a
performance with a traditional musical instrument and live
electronics inspired by theories of embodied music cognition
(EMC) and musical gestures. Considerations on EMC and
how gestures a ect the experience of music inform di erent
mapping strategies. Our intent is to enhance the expressiveness
and the liveness of performance by tracking gestures
via a multimodal motion capture system and to use motion
data to control several features of the music. We then
describe an application of such approach to a performance
with electric guitar and live electronics, focusing both on
aspects of meaning formation and motion capturing.
Proceedings of the 2014 International Workshop on Movement and Computing - MOCO '14, 2014
This paper describes the implementation of gestural mapping strategies for performance with a tra... more This paper describes the implementation of gestural mapping strategies for performance with a traditional musical instrument and electronics. The approach adopted is informed by embodied music cognition and functional categories of musical gestures. Within this framework, gestures are not seen as means of control subordinated to the resulting musical sounds but rather as significant elements contributing to the formation of musical meaning similarly to auditory features. Moreover, the ecological knowledge of the gestural repertoire of the instrument is taken into account as it defines the action-sound relationships between the instrument and the performer and contributes to form expectations in the listeners. Subsequently, mapping strategies from a case study of electric guitar performance will be illustrated describing what motivated the choice of a multimodal motion capture system and how different solutions have been adopted considering both gestural meaning formation and technical constraints.
An important problem in image processing is edge detection. Such problem is particularly difficul... more An important problem in image processing is edge detection. Such problem is particularly difficult for noisy imagens containing low contrast ed-ges, because noise typically introduces false edges. In this paper, a new pre-processing technique for simultaneous image denoising and edge enhancement base on wavelets is proposed. Some experimental results indicate that the pro-posed method improves the performance of existing edge detection techniques.
IEEE Transactions on Multimedia, 2015
ABSTRACT Computerized systems for e-learning and entertainment have been created in different are... more ABSTRACT Computerized systems for e-learning and entertainment have been created in different areas of knowledge. This work presents a system designed to track and evaluate hand movements for conducting mu-sical measures -binary, ternary and quaternary metrics -identifying for the user the maintenance of tempo and the correctness of hand patterns. The main goal of this work is to aid the study of musical rhythm for beginners, not focusing on conducting styles. The system was developed with computer vision algorithms to detect movements of the hand, and a finite-state machine was used to recog-nize the patterns. Feedback for the user is given through visual information on the screen. The accuracy of the results is verified by an external observer (a conducting specialist), with satisfactory results.
This paper proposes a new technique for parallelogram detection using the Tiled Hough Transform. ... more This paper proposes a new technique for parallelogram detection using the Tiled Hough Transform. Initially, the edge image is partitioned into rectangular regions (tiles), and the Hough Transform is computed for each tile. Peaks of the Hough image are extracted, and a parallelogram is detected when four extracted peaks satisfy certain geometric conditions. Then, adjacent tiles are grouped together to detect parallelograms that are not fully contained in a single tile. Finally, a validation process is applied to discard false positives.
The problem of detecting rectangular structures in images arises in many applications, from build... more The problem of detecting rectangular structures in images arises in many applications, from building extraction in aerial images to particle detection in cryo-electron microscopy. This paper proposes a new technique for rectangle detection using a windowed Hough Transform. Every pixel of the image is scanned, and a sliding window is used to compute the Hough Transform of small regions of the image. Peaks of the Hough image (which correspond to line segments) are then extracted, and a rectangle is detected when four extracted peaks satisfy certain geometric conditions. Experimental results indicate that the proposed technique produced promising results for both synthetic and natural images.
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Papers by Rodrigo Schramm
performance with a traditional musical instrument and live
electronics inspired by theories of embodied music cognition
(EMC) and musical gestures. Considerations on EMC and
how gestures a ect the experience of music inform di erent
mapping strategies. Our intent is to enhance the expressiveness
and the liveness of performance by tracking gestures
via a multimodal motion capture system and to use motion
data to control several features of the music. We then
describe an application of such approach to a performance
with electric guitar and live electronics, focusing both on
aspects of meaning formation and motion capturing.
performance with a traditional musical instrument and live
electronics inspired by theories of embodied music cognition
(EMC) and musical gestures. Considerations on EMC and
how gestures a ect the experience of music inform di erent
mapping strategies. Our intent is to enhance the expressiveness
and the liveness of performance by tracking gestures
via a multimodal motion capture system and to use motion
data to control several features of the music. We then
describe an application of such approach to a performance
with electric guitar and live electronics, focusing both on
aspects of meaning formation and motion capturing.