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Light Field Rendering. Shijin Kong Lijie Heng. Overview. Purpose Algorithm 1. representation of light field-4D (u, v, s, t) 2. creation 3. compression 4. display Discussion Applications . Purpose. To generate a new view from an arbitrary position Previous methods

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light field rendering

Light Field Rendering

Shijin Kong

Lijie Heng

overview
Overview
  • Purpose
  • Algorithm

1. representation of light field-4D (u, v, s, t)

2. creation

3. compression

4. display

  • Discussion
  • Applications
purpose
Purpose
  • To generate a new view from an arbitrary position
  • Previous methods

Environment maps - depth information

Interpolating - correspondence points

purpose cont
Purpose-Cont.
  • Limit: “fill in the gaps”, incorrect correspondences
  • To avoid these problems, a new method was proposed in this paper by using light field
what is light field
What is Light Field
  • In the real 3D world, how to represent a ray? Using 5D Plenoptic Function
4d representation
4D Representation
  • In free space (no occluders), oriented lines could be represented in 4D
creation of light fields
Creation of Light Fields
  • Aliasing

Low-pass filter

display
Display

Show video

discussion
Discussion
  • Advantages

1. easy, robust

2. fast to create new views -sampling

  • Limitations

Large amount of data

Building acquisition device

Fixed focal surface

discussion12
Discussion
  • Limitations

Large amount of data

Building acquisition device

Fixed focal surface

compression
Compression
  • VQ
  • Lempel-Zic Coding
discussion15
Discussion
  • Limitations

Large amount of data

Building acquisition device

Fixed focal surface

acquisition option1
Acquisition-Option1
  • Using a single camera

-hard to manipulate

-need refocus

-aliasing/blurriness

acquisition option2
Acquisition-Option2
  • Using an array of cameras

-fixed

-inflexible

acquisition option3
Acquisition-Option3
  • Using an microlens array to replace the camera array

-easy to use

-reduce aliasing

more on plenoptic camera
More on Plenoptic Camera
  • Higher image resolution, increased sharpness of the refocused photographs.
  • Shorter exposures and lower image noise
discussion24
Discussion
  • Limitations

Large amount of data

Building acquisition device

Fixed focal surface

dynamic reparameterized light fields
Dynamic Reparameterized Light Fields
  • Focal Surface is fixed when create light fields
  • What if recover pixels that are not on the focal surface
  • Reparameterize to required focal surface
dynamic reparameterized light fields26
Dynamic Reparameterized Light Fields
  • Move to desired new focal surface
  • Create a new 4D space with new focal surface
  • Recove ray with Reparameterization
  • (u, v, s, t) => (u, v, f, g)F
dynamic reparameterized light fields27
Dynamic Reparameterized Light Fields
  • Recover ray r
  • Resample from ray (s’, t’, f, g) and (s’’, t’’, f, g)
  • Interpolation, reconstruction with filter, … , etc
dynamic reparameterized light fields29
Dynamic Reparameterized Light Fields
  • Change the shape of focal surface
  • Gives focus on 3D object rather than planes
variable apertures
Variable Apertures
  • Also can generate variable aperture
  • Aperture
    • Control amount of light
    • Control depth of fields
  • Aperture Filter:
    • Control how many cameras are used to resample a required ray
    • Larger apertures produce images with narrow range of focus
application of light fields
Application of Light Fields
  • Multipersepective panorama
  • Lens simulation
applications of light field
Applications of Light Field
  • Multipersepective panorama
applications of light field38
Applications of Light Field
  • Lens simulation
    • Simulate lens with large aperture
future of light field
Future of Light Field
  • Need better ways to capture larger collection of viewpoints
  • Reconstruct 3D shape with vision algorithms
  • More images captured allow peeking arround occlusions
thank you
Thank you!

Questions?