Dr. Dario Villa Profile

Dr. Dario Villa

at Univ degli Studi di Milano

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Proceedings Article | 16 February 2011 Paper

Analysis of scene distortions in stereoscopic images due to the variation of the ideal viewing conditions

Alberto Viale, Dario Villa

Proceedings Volume 7863, 78632B (2011) https://doi.org/10.1117/12.876802

KEYWORDS: Eye, Image processing, Visualization, 3D image processing, Clouds, Projection systems, Stereoscopy, 3D displays, Virtual reality, 3D image reconstruction

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Recently stereoscopy has increased a lot its popularity and various technologies are spreading in theaters and homes allowing observation of stereoscopic images and movies, becoming affordable even for home users. However there are some golden rules that users should follow to ensure a better enjoyment of stereoscopic images, first of all the viewing condition should not be too different from the ideal ones, which were assumed during the production process. To allow the user to perceive stereo depth instead of a flat image, two different views of the same scene are shown to the subject, one is seen just through his left eye and the other just through the right one; the vision process is making the work of merging the two images in a virtual three-dimensional scene, giving to the user the perception of depth. The two images presented to the user were created, either from image synthesis or from more traditional techniques, following the rules of perspective. These rules need some boundary conditions to be explicit, such as eye separation, field of view, parallax distance, viewer position and orientation. In this paper we are interested in studying how the variation of the viewer position and orientation from the ideal ones expressed as specified parameters in the image creation process, is affecting the correctness of the reconstruction of the three-dimensional virtual scene.

Proceedings Article | 24 February 2010 Paper

Local color correction of stereo pairs

Davide Gadia, Dario Villa, Cristian Bonanomi, Alessandro Rizzi, Daniele Marini

Proceedings Volume 7524, 75240W (2010) https://doi.org/10.1117/12.838578

KEYWORDS: Optical filters, Video, Video acceleration, Visualization, Image filtering, Cameras, Image processing, Digital cameras, Image enhancement, Color vision

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The interest in the production of stereoscopic contents is growing rapidly. Stereo material can be produced using different solutions, from high level devices to standard digital cameras suitably coupled. In the latter case, color correction in stereoscopic images is complex, due to possible different Color Filter Arrays or settings in the two acquisition devices: users must often tune each camera separately, and this can lead to visible color inter-differences in the stereo pair. The color correction methods often considered in the post-processing stage of stereoscopic production are mainly based on global transformations between the two views, but this approach can not completely recover relevant limits in the gamuts of each image due to color distortions. In this paper we evaluate the application of perceptually-based spatial color computational models, based or inspired by Retinex theory, to pre-filter the stereo pairs. Spatial color algorithms apply an unsupervised local color correction to each pixel, based on a simulation of color perception mechanisms, and were proven to effectively reduce color dominants and adjust local contrasts in images. We filtered different stereoscopic streams with visible color differences between right and left frames, using a GPU version of the Random Spray Retinex (RSR) algorithm, that applies in few seconds an unsupervised color correction, and the Automatic Color Equalization (ACE) algorithm, that considers both White Patch and Gray World equalization mechanisms. We analyse the effect of the computational models both by visual assessment and by considering the changes in the image gamuts before and after the filtering.

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