The Focused Plenoptic Camera. Lightfield photographers, focus your cameras! Karl Marx
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1 The Focused Plenoptic Camera Lightfield photographers, focus your cameras! Karl Marx
2 Plenoptic Camera, Adelson 1992 Main lens focused on microlenses
3 Plenoptic Camera, Adelson 1992 Microlenses focused on infinity
4 Focused Plenoptic Camera Microlenses focused on main lens image
5 Comparison Plenoptic Camera (1.0) Focused Plenoptic Camera (2.0)
6 Comparison Plenoptic Camera Focused Plenoptic Camera Microlenses focused at infinity. Completely defocused relative to main lens image. Microlenses satisfy the lens equation. Exactly focused on the main lens image.
7 Comparison Plenoptic Camera Focused Plenoptic Camera Blurry microimages Sharp and inverted microimages
8 Why Inverted? What is the condition for exact focusing with main lens image shifted from the plane of microlenses? Answer: Simple relay imaging! This is like a telescope with multiple eyepieces.
9 Lightfield Rendering Small Part of Scene
10 Full Resolution Rendering: 500X Improvement!
11 Resolution Analysis Why do we have so much higher resolution in 2.0? Because the camera is focused: The main lens creates radiance r(x) at its image plane. Plenoptic 1.0 and 2.0 sample this radiance differently. For one microcamera, the optical transfer matrix is A. Radiance on the sensor: (continue)
12 Resolution Analysis For Plenoptic 1.0 the transfer matrix is: Inverse matrix
13 Resolution Analysis Rotation of each pixel to 90 degrees in optical phase space causes the low spatial resolution of 1.0 camera. For Plenoptic 2.0 the transfer matrix is: Inverse matrix
14 Resolution analysis For Plenoptic 2.0 There is no rotation, just shear: Pixels remain vertical. b/a of the sensor resolution.
15 Resolution analysis Plenoptic 1.0 Plenoptic 2.0
16 Two Ways of Focusing Galilean Telescopic Array Keplerian Telescopic Array (Proposed by Galileo and Kepler 400 years ago)
17 Two Ways of Focusing
18 Two Ways of Focusing Gaililean Imaging Keplerian Imaging
19 Plenoptic 2.0 Refocusing
20 Plenoptic 2.0 Refocusing
21 Plenoptic 2.0 Refocusing
22 Plenoptic 2.0 Resolution Plenoptic 2.0 sampling is more flexible: Decouples resolution from number of microlenses. Free to choose the spatial-angular tradeoff point. We can actually reach very low angular resolution not possible with traditional plenoptic camera (because edge effects would introduce noise). Stereo 3D. Up to b/a of the sensor resolution can be achieved! This is up to 100%, i.e. full sensor resolution!
23 Full Sensor Resolution Plenoptic Camera Demonstrating image capture with a plenoptic camera and rendering at full sensor resolution: 39 megapixel capture 39 megapixel rendering
24 Full Sensor Resolution Plenoptic Camera Demonstrating image capture with a plenoptic camera and rendering at full sensor resolution: 39 megapixel capture 39 megapixel rendering
25 Full Sensor Resolution Plenoptic Camera Demonstrating image capture with a plenoptic camera and rendering at full sensor resolution: 39 megapixel capture 39 megapixel rendering
26 Full Sensor Resolution Plenoptic Camera
27 Plenoptic HDR Camera
28 HDR with Plenoptic Camera 2.0 Each point is seen multiple times in different microlenses We can put different apertures on different microlenses
29 HDR with Plenoptic Camera 2.0 We can put different apertures on different microlenses Fresnel zones as aperture
30 HDR with Plenoptic Camera 2.0 Two of our microlens arrays under the microscope 4 times reduction 8 times reduction of aperture of aperture
31 31 HDR (part of raw image with plenoptic 2.0)
32 32
33 33
34 HDR with Plenoptic Camera 2.0 We can put different filters on different microlenses: Neutral density, color (for spectral imaging), polarization X increase 12-color imaging sampling four in dynamic range with RGB sensor linear polarizations
35 Plenoptic Superresolution Camera
36 Superresolution with Plenoptic Camera 2.0 Each microlens is observing the scene as a slightly shifted camera. We can compute the subpixel shift based on camera parameters. Then, superresolve.
37 Superresolution with Plenoptic Camera
38 Superresolution with Plenoptic Camera
39 Superresolution with Plenoptic Camera
40 Superresolution with Plenoptic Camera 2.0 Observe the subpixel shift
41 Superresolution with Plenoptic Camera 2.0 Observe the subpixel shift
42 Superresolution with Plenoptic Camera
43 Superresolution with Plenoptic Camera
44 Superresolution with Plenoptic Camera 2.0 Compare same image with traditional lifgtfield rendering (plenoptic 1.0).
45 Superresolution with Plenoptic Camera
46 Superresolution with Plenoptic Camera
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