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ACM Transactions on Applied Perception (TAP), Volume 4 Issue 3, November 2007

Guest Editorial
William B. Thompson
Article No.: 14
DOI: 10.1145/1278387.1278388

Perceptual rendering of participating media
Veronica Sundstedt, Diego Gutierrez, Oscar Anson, Francesco Banterle, Alan Chalmers
Article No.: 15
DOI: 10.1145/1278387.1278389

High-fidelity image synthesis is the process of computing images that are perceptually indistinguishable from the real world they are attempting to portray. Such a level of fidelity requires that the physical processes of materials and the...

Evaluation of real-world and computer-generated stylized facial expressions
Christian Wallraven, Heinrich H. Bülthoff, Douglas W. Cunningham, Jan Fischer, Dirk Bartz
Article No.: 16
DOI: 10.1145/1278387.1278390

The goal of stylization is to provide an abstracted representation of an image that highlights specific types of visual information. Recent advances in computer graphics techniques have made it possible to render many varieties of stylized imagery...

Perception-based contrast enhancement of images
Aditi Majumder, Sandy Irani
Article No.: 17
DOI: 10.1145/1278387.1278391

Study of contrast sensitivity of the human eye shows that our suprathreshold contrast sensitivity follows the Weber Law and, hence, increases proportionally with the increase in the mean local luminance. In this paper, we effectively apply this...

Using virtual environments to assess time-to-contact judgments from pedestrian viewpoints
A. Elizabeth Seward, Daniel H. Ashmead, Bobby Bodenheimer
Article No.: 18
DOI: 10.1145/1278387.1278392

This paper describes the use of desktop and immersive virtual environments to study judgments that pedestrians make when deciding to cross a street. In particular, we assess the ability of people to discriminate and estimate time-to-contact (TTC)...

Categorization of natural scenes: Local versus global information and the role of color
Julia Vogel, Adrian Schwaninger, Christian Wallraven, Heinrich H. Bülthoff
Article No.: 19
DOI: 10.1145/1278387.1278393

Categorization of scenes is a fundamental process of human vision that allows us to efficiently and rapidly analyze our surroundings. Several studies have explored the processes underlying human scene categorization, but they have focused on...