Novel Depth Cues from Uncalibrated Near-field Lighting LED Camera Sanjeev J. Koppal and Srinivasa G.
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Novel Depth Cues from Uncalibrated Near-field Lighting LED Camera Sanjeev J. Koppal and Srinivasa G. Narasimhan Scene 1. Plane-Scene Intersections Light source moves in a line Scene Detect intensity maxima Results appear similar to light-striping Intensity Maxima in Lambertian Scenes The intensity, E, at any time t for a lambertian scene is given by: Input Images Metal Office Desk P Plane-Scene Intersections The location of the maxima is found by setting the derivative to zero: Plane Perpendicular to source path. Plane-Scene Intersections Painted House Camera Vertical and Horizontal Intersections The maxima location occurs at P if the light source is close to scene and D is small. 2. Depth Ordering for Homogeneous Scenes Light source moves in a plane Integrate pixel intensities Ordering as a pseudo depth Overlapping Incident Angles Q Q Scene Input Images Polyresin Statue Left Plane Depth Ordering Camera Wood Chair Depth Ordering Rendering The integral of intensities at any scene point P, consists of angles that either overlap with those at scene point Q or are different: Right Plane Image Plane Ordering from three different planes Evaluation using Renderings 3. Symmetry Pairs for Homogeneous Scenes Light source moves in bisecting plane Match identical intensities P P Method works for isotropic BRDFs Depth Ordering Lambertian + Torrance-Sparrow Scores Oren-Nayar Scores Correctly Ordered Fraction Correctly Ordered Fraction 0.80 0.95 Scene Input Images 0.75 0 Bunny Bunny Buddha Buddha Dragon Dragon Roughness 0.65 1 Plane Fit Error Roughness Plane Fit Error Vertical Horizontal Metal Office Desk Camera Symmetry Pairs 1 Lambertian + Torrance-Sparrow Scores Oren-Nayar Scores Plane-Scene Intersections 0 Vertical Horizontal 0.05 0.05 0.015 0.015 Symmetry Pairs 0 Roughness 1 0 Roughness 1