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Rain produces sharp intensity fluctuations in images and videos, which
degrade the performance of outdoor vision systems. These intensity fluctuations
depend on various factors, such as, the camera parameters, the properties of
rain and the brightness of the scene. It turns out that the properties of rain
-- its small drop size, high velocity and low density -- make its visibility
strongly dependent on camera parameters such as exposure time and depth of
field. In this project, we demonstrate how these parameters can be selected so
as to reduce or even remove the effects of rain without altering the appearance
of the scene.The proposed method serves to make vision algorithms more robust
to detect rain without any need for post-processing. In addition, it can be
used to control the visual effects of rain during the filming of movies.
Conversely, the parameters of a camera can also be set to enhance the visual
effects of rain. This can be used to develop an inexpensive and portable
camera-based rain gauge that provides instantaneous rain-rate
measurements. |
