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A 4D DCT-based lenslet light field codec

Carvalho, M. ; Pereira, M. ; Pagliari, C.L.P. ; Pereira, F. ; Alves, GOA ; Testoni, V. ; Silva, E.

A 4D DCT-based lenslet light field codec, Proc IEEE International Conf. on Image Processing - ICIP, Atenas, Greece, Vol. -, pp. - - -, October, 2018.

Digital Object Identifier: 10.1109/ICIP.2018.8451583

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Light fields aim to represent visual information in 3D space. They
are 4D structures that contain the images of a given scene from a
sampled 2D range of viewpoints. When acquired using a lenslet
camera, in addition to the ordinary intra-view redundancy, these
views have a great deal of inter-view redundancy. In this work we
propose a light field codec that fully exploits the 4D redundancy of
light fields by using a 4D transform and hexadeca-trees. It initially
divides the light field into 4D blocks and computes a 4D Discrete
Cosine Transform of each one. Then the transform coefficients
of the 4D block are grouped using hexadeca-trees on a bitplaneby-
bitplane basis, and the generated stream is encoded using an
adaptive arithmetic coder. The proposed codec has been employed
to encode the JPEG Pleno lenslet light fields. The rate-distortion
results have been assessed using test conditions comparable to the
ones presented at the ICIP 2017 Light Field Coding Grand Challenge.
The proposed codec, despite being conceptually simple,
achieves competitive rate-distortion performance.