Novel Depth Cues from Uncalibrated Near-field Lighting Sanjeev J. Koppal and Srinivasa Narasimhan...
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Novel Depth Cues from Uncalibrated Near-field Lighting Sanjeev J. Koppal and Srinivasa Narasimhan Carnegie Mellon University Sponsors: ONR and NSF
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Transcript of Novel Depth Cues from Uncalibrated Near-field Lighting Sanjeev J. Koppal and Srinivasa Narasimhan...
Novel Depth Cues from Uncalibrated Near-field Lighting
Sanjeev J. Koppal and Srinivasa Narasimhan
Carnegie Mellon University
Sponsors: ONR and NSF
Scene
Calibrated Near Point Light Source
Inverse-square fall-off can give depth information
(Clark 92, Iwahori et al 94, Kao and Fuh 95, Magda et al 01, Zickler et al 02, Prados and Faugeras 05)
1
R 2
Lambertian Scenes
Lambertian Model:
Solve for maxima location:
Expression for maxima:
Albedo
Quadratic
Shortest distance to light source path
If D is small, maxima happens at t = i
Integrating the Profile
Integral of Profile:
P
Q
Overlapped Incident Angles
P
Q
S < S if:
Works for convex Lambertian scenes
p q