| 摘要 |
<p>A method (200) and apparatus for determining certain ambient conditions in a scene by analyzing a sequence of images (202) that represent the scene. The apparatus uses only image information to determine scene illumination (200), or the presence of shadows (206), fog, smoke, or haze by comparing (208) properties of the detected objects, averaged over a finite video sequence, against properties of the reference image of the scene as that scene would appear without any objects present. Such a reference image is constructed in a manner similar to time-averaging successive camera images.</p> |
