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LED. Camera. Scene. Q. Q. P. P. Wood Chair. Camera. Camera. Camera. Ordering from three different planes. Bunny. Bunny. Buddha. Buddha. Dragon. Dragon. 0.05. 0.05. Vertical. Vertical. Horizontal. Horizontal. 0.015. 0.015. 0. 0. 1. 1. - PowerPoint PPT Presentation
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LED
SceneCamera
Novel Depth Cues from Uncalibrated Near-field LightingSanjeev J. Koppal and Srinivasa G. Narasimhan
2. Depth Ordering for Homogeneous Scenes
Evaluation using Renderings
1. Plane-Scene Intersections
The intensity, E, at any time t for a lambertian sceneis given by:
The location of the maxima is found by setting the derivative to zero:
The maxima location occurs at P if the light source is close to scene and D is small.
P
Q
P
Q
The integral of intensities at any scene point P, consists of angles that either overlap with those at scene point Q or are different:
Painted House Vertical and Horizontal Intersections
Metal Office Desk Plane-Scene Intersections
Ordering from three different planesWood Chair
Left Plane
Right Plane
Image Plane
3. Symmetry Pairs for Homogeneous Scenes
Metal Office Desk Symmetry Pairs
Polyresin Statue Depth Ordering Rendering
Correctly Ordered Fraction
Oren-Nayar Scores
Lambertian + Torrance-SparrowScores
Bunny
Buddha
Dragon
Correctly Ordered Fraction
Bunny
Buddha
Dragon
Roughness0 1
0.95
0.750 1
0.80
0.65
Scene
Light source moves in a line Detect intensity maxima Results appear similar to light-striping Intensity Maxima in Lambertian Scenes
Light source moves in a plane Integrate pixel intensities Ordering as a pseudo depth Overlapping Incident Angles
Plane-Scene Intersections
Symmetry Pairs
PPlane Perpendicularto source path.
Scene
Depth Ordering
Scene
Input Images
Input Images
Light source moves in Match identical intensities Method works for isotropic BRDFs bisecting plane
Input ImagesRoughness
Plane Fit Error
0 1
0.05
0.015
Plane Fit Error
0.05
0.0150 1
Camera
Camera
Camera Roughness Roughness
Vertical
Horizontal
Vertical
Horizontal
Oren-Nayar Scores Lambertian + Torrance-SparrowScores
Depth Ordering
Plane-Scene Intersections