Summary: Glare Aware Photography: 4D Ray Sampling for
Reducing Glare Effects of Camera Lenses
Cyrus A. Wilson
Mitsubishi Electric Research Labs (MERL), Cambridge, MA
University of Maryland, College Park, MD
Glare ReducedCaptured PhotoGlare Enhanced
Figure 1: We extract glare components from a single-exposure photo in this high dynamic range scene. Using a 4D analysis of glare inside the
camera, we can emphasize or reduce glare. The photo in the middle shows a person standing against a sunlit window. We extract reflection
glare generated inside lens and manipulate it to synthesize the result shown on the left. On the right we show the glare-reduced component.
Notice that the face is now visible with improved contrast.
Glare arises due to multiple scattering of light inside the camera's
body and lens optics and reduces image contrast. While previous
approaches have analyzed glare in 2D image space, we show that
glare is inherently a 4D ray-space phenomenon. By statistically an-
alyzing the ray-space inside a camera, we can classify and remove
glare artifacts. In ray-space, glare behaves as high frequency noise