3D-AVC-CE3 results on Nonlinear Depth Representation & Coding

1 Introduction This documents presents results attained by Poznan University of Technology in experiments on Non-linear depth representation [1] as a part of core experiment CE defined in [2]. 2 Description of the tool M22697 describes a normative tool named non-linear depth representation. The depth is internally represented in such a way that the closer objects are represented more accurately than distant ones. Internal depth sample values are defined by the following power-law expressions, similar as in the case of well known gamma correction: (1) Exponent is automatically chosen by the encoder with use of base QP for the depth and sent to decoder in the encoded bitstream (one parameter is added to i.e. SPS): (2) Depth map samples are represented on increased number of bits with use of IBDI (Internal Bit Depth Increase) tool. Finally, in the decoder the original depth is reconstructed with inverse expression: (3) This tool is designed to improve subjective quality of the synthesized views and thus assessment by PSNR is not adequate and should be done subjectively instead. The parameter exponent is transmitted to the decoder in order decode depth.