Banca de DEFESA: PETRÚCIO RICARDO TAVARES DE MEDEIROS

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : PETRÚCIO RICARDO TAVARES DE MEDEIROS
DATE: 02/11/2020
TIME: 14:00
LOCAL: Sala Virtual PPgEEC
TITLE:

Visual Stimulus Detection Using Multiple Foveas

KEY WORDS:

Multifoveation, visual stimuli, visual detection, gradient descent, maximum likelihood, trilateration and barycentric coordinates

PAGES: 98
BIG AREA: Ciências Exatas e da Terra
AREA: Ciência da Computação
SUBÁREA: Metodologia e Técnicas da Computação
SPECIALTY: Processamento Gráfico (Graphics)
SUMMARY:

The multifoving technique allows the addition of several focuses in the image, which can be explored as points of visual attention in contexts of detection, identification and / or object recognition. However, the use of the multifoving technique requires knowledge of the position of visual stimuli. In this work we propose a new approach to detect visual stimuli using the structure of multiple foveas. For this, we use mathematical strategies adapted to the context of computational vision, which take into account the distribution of the foveas to estimate the location of visual stimuli in the image. The mathematical strategies adopted were the descent of the gradient (potential field), maximum likelihood, multilateration, trilateration and barycentric coordinates. The results show that the algorithms converge for the position of the visual stimulus, with the exception of the local potential intersection algorithm due to the sensitivity to local minimums. In addition, the algorithms that use potential fields require more processing time and computational resources compared to other strategies. However, it is possible to affirm that three fóveas are sufficient to estimate the position of a visual stimulus in the image making use of the trilateration algorithms and baricentric coordinates. We conclude that the multi-panning associated with mathematical strategies can be applied in visual detection and presents convergence with at least three foveae.

BANKING MEMBERS:
Externo ao Programa - 2177445 - BRUNO MOTTA DE CARVALHO
Externo à Instituição - ESTEBAN WALTER GONZALEZ CLUA - UFF
Interno - 1345674 - LUIZ MARCOS GARCIA GONCALVES
Presidente - 2929823 - RAFAEL BESERRA GOMES
Externo à Instituição - ROBERTO MARCONDES CESAR JUNIOR - USP