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