Method for estimating the shape of an object from IR image shadi

Details Method for estimating the shape of an object from IR image shadi Method for estimating the shape of an object from IR image shadi

1993-07-13

1996-05-14

Mancuso, Joseph

Image analysis

Pattern recognition

Feature extraction

348164, H04N 533

Patent

active

055175805

ABSTRACT:
A method for estimating the shape of a body that emits electromagnetic energy using a sensor (10) having an image plane (15) and the ability to measure the intensity of the electromagnetic radiation (12) received at a point on image plane (15) comprises the steps of first expressing the intensity of radiation (12) reaching image plane (15) as a function of surface gradient parameters (p,q) for a pre-determined point (P.sub.i) on object (14). Next, the method requires measuring the intensity (E(s,t)) of radiation (12) that sensor (10) senses at the point (P.sub.i) on image plane (15). The method then requires determining the values of the surface gradient parameters (p,q) for the point (P.sub.i) on object (14) that minimizes the difference between the expressed intensity (F.sub.1 (p,q) for the pre-determined point (P.sub.i) on object (14) and the measured intensity (E(s,t)) at pixel (p.sub.i) on image plane (15).

REFERENCES:
patent: 4110617 (1978-08-01), Legille
patent: 5168161 (1992-12-01), Markandey
Zheng et al "Estimation of Illuminant Direction, Albedo and Shape from Shading", IEEE 1991.
Frankot et al. "A Method for Enforcing Integrability in Shape from Shading Algorithms" IEEE. Trans. Patt. Anal. Machine Int. vol. 10, No. 4 Jul. 1988 pp. 439-451.
Zheng et al. "Estimation of Illuminant Direction, Albedo, and Shape from Shading", IEEE Trans. Patt. Anal. Machine Int. vol. 13, No. 7, Jul. 1991, pp. 680-697.
Choe et al. "3-D Shape from a Shaded and Textural Surface Image", IEEE Trans. Patt. Anal. Machine. Int., vol. 13, No. 9, Sep. 1991 pp. 907-919.

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