Visual saliency guided normal enhancement technique for 3D shape depiction

Visual saliency can effectively guide the viewer's visual attention to salient regions of a 3D shape. Incorporating the visual saliency measure of a polygonal mesh into the normal enhancement operation, a novel saliency guided shading scheme for shape depiction is developed in this paper. Due to the visual saliency measure of the 3D shape, our approach will adjust the illumination and shading to enhance the geometric salient features of the underlying model by dynamically perturbing the surface normals. The experimental results demonstrate that our non-photorealistic shading scheme can enhance the depiction of the underlying shape and the visual perception of its salient features for expressive rendering. Compared with previous normal enhancement techniques, our approach can effectively convey surface details to improve shape depiction without impairing the desired appearance.

First row: Our expressive rendering of the Golf Ball model (fourth column) vs our saliency guided normal enhancement technique guided by Lee's mesh saliency measure (second column). Second row: The expressive rendering of the Golf Ball model (fourth column) vs our saliency guided normal enhancement technique guided by Feixas'information-based saliency measure (second column).Figure optionsDownload high-quality image (248 K)Download as PowerPoint slideHighlights
► Due to normal perturbation, the theoretical analysis of variation of vertex luminance is given.
► A novel saliency guided shading scheme is presented to improve 3D shape depiction.
► We incorporate the visual saliency information into the normal enhancement operation.
► Our expressive rendering results can enhance visually salient features of the underlying shape.