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Extraction of features from infrared images: (a) fire-front, (b) once the fire-base has been segmented, it is easy to identify the fire-base contour, (c) taking into account the direction of fire advance, it is simple to differentiate between the front and the rear fire-base contours, (d) the fire-base width is computed as the distance between pixels on the front and the rear contours along the direction of fire advance.
