1. A computer-implemented method for removing false-positive foreground pixels from a video frame, comprising: extracting, via one or more processors, a foreground image from the video frame using a background model image; determining, based on at least the foreground image and the background model image used as a proxy for an illuminance component of the foreground image, an approximated reflectance component of the foreground image, wherein the approximated reflectance component provides approximated reflectance values for respective pixels in the foreground image; and removing from the foreground image pixels having approximated reflectance values less than a first threshold value.