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Green Image
Issue No. 09 - September (2002 vol. 24)
ISSN: 0162-8828
pp: 1226-1238
<p><b>Abstract</b>—In the absence of cues for absolute depth measurements as binocular disparity, motion, or defocus, the absolute distance between the observer and a scene cannot be measured. The interpretation of shading, edges, and junctions may provide a 3D model of the scene but it will not provide information about the actual “scale” of the space. One possible source of information for absolute depth estimation is the image size of known objects. However, object recognition, under unconstrained conditions, remains difficult and unreliable for current computational approaches. Here, we propose a source of information for absolute depth estimation based on the whole scene structure that does not rely on specific objects. We demonstrate that, by recognizing the properties of the structures present in the image, we can infer the scale of the scene and, therefore, its absolute mean depth. We illustrate the interest in computing the mean depth of the scene with application to scene recognition and object detection.</p>
Depth, image statistics, scene structure, scene recognition, scale selection, monocular vision.

A. Torralba and A. Oliva, "Depth Estimation from Image Structure," in IEEE Transactions on Pattern Analysis & Machine Intelligence, vol. 24, no. , pp. 1226-1238, 2002.
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