Um metodo rapido para rendering de volumes com perspectiva digital

AUTOR(ES)
DATA DE PUBLICAÇÃO

1999

RESUMO

Volume visualization methods require extensive storage and time-intensive computations. To make them viable, researches have proposed hardware-based and software-based solutions. In most of these solutions, the rendering is based on orthographic parallel projection. However, in many applications such as virtual endoscopy, perspective projection becomes necessary. This work reports a study on image processing and computer graphics techniques for volume visualization applied to medicine. And extends one of these methods, called shell rendering, to provide perspective projection in an efficient way. The method shell rendering is described and the problems related to its extension to perspective projection are discussed. The adopted solution proposes a modification in the original data structure and a fast projection algorithm, introducing the concept of digital perspective. The new method was denominated digital perspective shell rendering. The main idea in digital perspective is that each object should be rendered with size inversely proportional to its distance to the observer and this distance can be discretized. In this work, the observer is assumed to be always outside the object. The shell rendering and digital perspective shell rendering methods were implemented, tested and compared under two aspects: image quality and computational time. The digital perspective shell rendering has shown to produce the same image quality as the original method and computational time only about 1.6 times greater than with orthographic parallel projection

ASSUNTO(S)

computação grafica visualização

ACESSO AO ARTIGO

Documentos Relacionados