Online elimination of reflected images to generate high-quality images

Noboru Ohnishi; Masaki Iwase; Tsuyoshi Yamamura; Toshimitsu Tanaka

doi:10.1117/12.334684

28 December 1998 Online elimination of reflected images to generate high-quality images

Noboru Ohnishi, Masaki Iwase, Tsuyoshi Yamamura, Toshimitsu Tanaka

Proceedings Volume 3653, Visual Communications and Image Processing '99; (1998) https://doi.org/10.1117/12.334684
Event: Electronic Imaging '99, 1999, San Jose, CA, United States

Abstract

We often see scenes where an object's image is reflected on window glass and overlaps with a image of another object behind the glass. This paper proposes on-line methods for eliminating images reflected specularly on a smooth surface such as glass and plastic. Our methods are based on the optical property that light reflected on glass is polarized, while light transmitted through glass is less polarized. It is possible to eliminate reflected light with a polarizing filter. The polarization direction, however, changes even for planar glass and is not easily determined without information about the position and orientation of the glass and objects relative to the camera. Our method uses a series of images obtained by rotating a polarizing filter placed in front of a camera. Reflected images are removed by selecting just minimum image intensity among a series of images for each pixel. We propose two methods for estimating minimum image; one is min- max method and the other parameter estimation method. We conducted experiments with real images and compared the performances of the two methods. As a result, we could generate high quality image without reflected images at semi- video rate of 15 frames per second.

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Noboru Ohnishi, Masaki Iwase, Tsuyoshi Yamamura, and Toshimitsu Tanaka "Online elimination of reflected images to generate high-quality images", Proc. SPIE 3653, Visual Communications and Image Processing '99, (28 December 1998); https://doi.org/10.1117/12.334684

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KEYWORDS

Polarization

Glasses

Cameras

Optical filters

Image filtering

Image processing

Reflection

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