Transforms for High-Rate Distributed Source Coding

We extend high-rate quantization theory to distributed source coding for the case in which the rate is the conditional entropy of the quantization index given the side information. This theory is applied to orthonormal block transforms for distributed source coding. A formula for the optimal rate allocation and an approximation to the optimal transform are derived. We implement a transform-domain Wyner-Ziv video coder that encodes frames independently but decodes them conditionally. Experimental results show a rate-distortion improvement with respect to the pixel-domain coder by using the discrete cosine transform.