Novel Depth Cues from Uncalibrated Near-field Lighting in Scene Analysis
This study explores the methodology for depth ordering in homogeneous scenes using novel depth cues from uncalibrated near-field lighting. By analyzing plane-scene intersections with movable light sources, the research leverages intensity maxima to derive spatial relationships in Lambertian scenes and evaluates performance using various imagery inputs, including polyresin statues and office settings. The findings emphasize the significance of ordering depth efficiently, utilizing approaches that integrate pixel intensities and identify symmetry pairs, yielding promising results for rendering and depth perception.
Novel Depth Cues from Uncalibrated Near-field Lighting in Scene Analysis
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Presentation Transcript
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 Novel Depth Cues from Uncalibrated Near-field Lighting Sanjeev J. Koppal and Srinivasa G. Narasimhan 1. Plane-Scene Intersections Light source moves in a line 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: Scene Input Images Metal Office Desk Plane-Scene Intersections P The location of the maxima is found by setting the derivative to zero: Plane Perpendicular to source path. Plane-Scene Intersections The maxima location occurs at P if the light source is close to scene and D is small. Painted House Vertical and Horizontal Intersections 2. Depth Ordering for Homogeneous Scenes Light source moves in a plane Integrate pixel intensities Ordering as a pseudo depth Overlapping Incident Angles Scene Input Images Polyresin Statue 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 Left Plane Depth Ordering Image Plane Evaluation using Renderings 3. Symmetry Pairs for Homogeneous Scenes Light source moves in Match identical intensities Method works for isotropic BRDFs bisecting plane Lambertian + Torrance-Sparrow Scores Oren-Nayar Scores Depth Ordering Correctly Ordered Fraction Correctly Ordered Fraction 0.80 0.95 Scene Input Images 0.75 0.65 0 1 Roughness Roughness 0 1 Lambertian + Torrance-Sparrow Scores Oren-Nayar Scores Plane-Scene Intersections Plane Fit Error Plane Fit Error Metal Office Desk Symmetry Pairs Symmetry Pairs Roughness Roughness
