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Color values of moving pixels are compared with a pre-determined color distribution,
which represents possible fire colors in video in RGB color space. The fire color
distribution is obtained from sample images containing fire regions. Possible color
values form a three dimensional point cloud in the RGB color space as shown in
Fig.
(a). The cloud is represented by using a mixture of Gaussians
in the RGB color space as described in [20]. A Gaussian mixture
model with ten Gaussian distributions is estimated from past observations as
shown in Fig.
(b).
Let
be a pixel at location
with color values
. We check if the pixel lies within two standard
deviations of the centers of the Gaussians to determine its nature.
In other words, if a given pixel color value is inside one of the
spheres shown in Fig.
(b), then it is assumed to be
a fire colored pixel. We set a binary mask, called
,
which returns whether a given pixel is fire colored or not. The
intersection of this mask with
formed in the first step
is fed into the next step as a new binary mask called
.
Next: Temporal Wavelet Analysis
Up: Detection Algorithm
Previous: Moving Region Detection
ugur toreyin
2005-11-27