Abstract
Shadows bedevil multimedia applications, e.g. seeing into shadow regions in surveillance video. Model-based and non-model based, statistical methods, spatial, temporal, and invariant-based methods have been devised for combatting the shadow problem. Here we take a different approach, by attenuating the shadow by utilizing a second image under another illuminant to remove the effect of shadow-edges from an edge map of each frame. As a precursor step, we examine flash/noflash still image pairs. A flash image provides lessened shadows, but other shadows are produced. We can produce a flash-only (no ambient) image by subtracting the two images, but several artifacts remain. Instead, we have used the pure-flash image to detect the ambient shadows [ICME06]. However that method may fail when there are flash-shadows or specularities in the copy region. Here we manipulate the gradient field using a smoothing step including the directionality of edges near the shadow boundary, with improved results
Original language | English |
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Pages | 198-201 |
Number of pages | 4 |
DOIs | |
Publication status | Published - Oct 2006 |
Event | IEEE Workshop on Multimedia Signal Processing - Victoria, Canada Duration: 3 Oct 2006 → 6 Oct 2006 |
Workshop
Workshop | IEEE Workshop on Multimedia Signal Processing |
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Abbreviated title | MMSP'06 |
Country/Territory | Canada |
City | Victoria |
Period | 3/10/06 → 6/10/06 |