Perception-based fast rendering and antialiasing of walkthrough sequences

Abstract

AbstractÐIn this paper, we consider accelerated rendering of high quality walkthrough animation sequences along predefined paths. To improve rendering performance, we use a combination of a hybrid ray tracing and Image-Based Rendering (IBR) technique and a novel perception-based antialiasing technique. In our rendering solution, we derive as many pixels as possible using inexpensive IBR techniques without affecting the animation quality. A perception-based spatiotemporal Animation Quality Metric (AQM) is used to automatically guide such a hybrid rendering. The Image Flow (IF) obtained as a byproduct of the IBR computation is an integral part of the AQM. The final animation quality is enhanced by an efficient spatiotemporal antialiasing which utilizes the IF to perform a motioncompensated filtering. The filter parameters have been tuned using the AQM predictions of animation quality as perceived by the human observer. These parameters adapt locally to the visual pattern velocity.

Perception-based global illumination, rendering, and animation techniques

“…We replace IBR-derived pixels in such regions with raytraced pixels. The replacement is performed when the PF velocity is below a specified threshold value, which we estimated in subjective and objective (using the AQM) experiments [21]. In typical animations, usually only a few percent of the pixels are replaced, unless the camera motion is very slow.…”

“…(a) Mask out from È Å Ô pixels with low PF values (in [21] we discuss experimental derivation of the PF threshold value used for such masking).…”

“…In this context, a global approach involving both spatial and temporal dimensions appears promising research direction. In this paper we discuss two example solutions in which spatio-temporal considerations are taken into account to improve the performance of walkthrough animation rendering [21] and global illumination computation for dynamic environments [22].…”

“…In [4,21] a more extended discussion on estimates of the retinal velocity is available, which takes into account the eye natural drift, smooth pursuit, and saccadic movements. Figure 1 depicts the spatiovelocity CSF model specified in equation (2).…”

A Novel Technique for Removing Jagged Edges of Image Due to Aliasing

“…It is basically to restore the edges affected by thresholding, tone mapping or gamma correction etc. Initially antialiasising techniques were mainly concerned with graphics hardware and extensive oversampling which was handled through prefilter convolution [5], it uses the general shading method texture mapping and complex illumination. The combination of ray tracing and Image based Rendering technique is used to present a new way of antialiasing [6].…”