Distributed Coding of Multiresolution Omnidirectional Images

This paper addresses the problem of compact representation of a 3D scene, captured by distributed omnidirectional cameras. As the images from the sensors are likely to be correlated in most practical scenarios, we build a distributed algorithm based on coding with side information. A reference image is processed with a wavelet transform and progressively encoded. The Wyner-Ziv images undergo a multiresolution representation, and the generated bitplanes are channel encoded with LDPC codes. The central decoder eventually reconstructs the Wyner-Ziv images given by the syndrome bits from the channel codes using the reference omnidirectional image. It also iteratively implements motion estimation on the 2-sphere in order to improve the side information. Experimental results demonstrate that distributed coding improves the rate-distortion performance for coding a set of omnidirectional images when compared to independent coding solutions. The proposed method can further be extended to the d...

• Type: Conference
• Year: 2007
• Where: ICIP
• Authors: Vijayaraghavan Thirumalai, Ivana Tosic, Pascal Frossard
• Keywords: ICIP 2007, Image Processing, Omnidirectional Image, Reference Omnidirectional Image, Wyner-Ziv Images