Improving Resolution and Depth-of-Field of Light Field Cameras

91 Pages·2014·5.21 MB·English

Dappled Photography: Mask Enhanced Cameras for
Heterodyned Light Fields and Coded Aperture Refocusing
Ashok Veeraraghavan, Ramesh Raskar, Amit Agrawal,
Ankit Mohan & Jack Tumblin

Mitsubishi Electric Research Labs (MERL), Cambridge, MA, USA
Northwestern University, IL
Coded Exposure [Raskar, Agrawal, Tumblin SIGGRAPH 2006]
Coded Exposure (Flutter Shutter) Camera
Raskar, Agrawal, Tumblin [Siggraph2006]
Coding in Time: Shutter is opened and closed
Blurring == Convolution
Sharp Photo Blurred Photo
PSF == Sinc Function
ω
Traditional Camera: Shutter is OPEN: Box Filter
Coded Exposure
Sharp Photo Blurred Photo
PSF == Broadband Function
Preserves High Spatial
Frequencies
Flutter Shutter: Shutter is OPEN and CLOSED
Coded
Traditional
Exposure
Deblurred Deblurred
Image Image
Image of
Static
Object
How to handle focus
blur?
Coded Exposure Coded Aperture
Temporal 1-D broadband code: Spatial 2-D broadband mask:
Motion Deblurring Focus Deblurring
Point light
source (LED)
In Focus Photo
Out of Focus Photo: Open Aperture