Perceptually based radiance map for realistic composition

The seamless composition of synthetic objects into real-world scenes requires a high level of detail to convince viewers that the rendered object belongs in the scene. These details include illumination properties that perceptually match the real-world environment. To achieve such effects, image based lighting is often used to emulate real-world lighting. This paper explores the role of lighting, and measures effects of local illumination changes. A psychophysical study is presented that captures the thresholds of the human visual systems ability to perceive inconsistencies in illumination in image composites. Further, a set of optimised parameters for image based lighting is proposed. The results show a significant reduction in memory while maintaining the perceived visual quality of a composite render.