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Dissertação de Davi Padilha Mesquita


Detalhes do Evento


Aluno: Davi Padilha Mesquita
Orientador: Prof. Dr. Marcelo Walter

Título: Reaction-DiffusionWoodcuts

Linha de Pesquisa: Computação Gráfica e Visualização de Dados.

Data: 22/03/2019
Hora: 09h30
Local: Sala 218 do Prédio 43412 do Instituto de Informática da UFRGS

Banca Examinadora:
Profª. Drª. Carla Maria Dal Sasso Freitas (UFRGS)
Prof. Dr. Eduardo Simões Lopes Gastal (UFRGS)
Prof. Dr. Marcelo de Gomensoro Malheiros (UNIVATES – por videoconferência)

Presidente da Banca: Prof. Dr. Marcelo Walter

Abstract: Woodcuts are a traditional form of engraving, where paint is rolled over the surface of acarved wood block which will be used as a printing surface over a sheet of paper, so onlythe non-carved parts will be printed in the paper.  In this work, we present an approachfor computer simulated woodcuts using reaction-diffusion as the underlying mechanism.First, we preprocess the segmented input image to generate a parameter map, containingvalues for each pixel of the image. This parameter map will be used as an input to controlthe reaction-diffusion processing, allowing different areas of the image to have distinctappearances,  such as spots or stripes with varied size or direction,  or areas with plainblack or white color.  Reaction-diffusion is then performed resulting in the raw appear-ance of the final image. After reaction-diffusion, we apply a thresholding filter to generatethe final woodcut black and white appearance. To better validate our work, we performeda qualitative evaluation of our results.  Our results show that the final images look quali-tatively similar to some styles of woodcuts, and add yet another possibility of computergenerated artistic expression,  which demonstrates the potential of reaction-diffusion totasks in the field of non-photorealistic rendering.

Keywords: Reaction-Diffusion. Woodcuts. Expressive Rendering.