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An analysis-based approach for unequal loss-protected multiple description coding (packetization) of the scalable (prioritized / progressive) source code streams is proposed. For a given number of packets (descriptions) of the known size, unequal loss-protected packetization leads to segment the scalable code stream, such that the source can be reconstructed with the maximum possible fidelity at the...
Motion estimation is one of the key tools to achieve a very low bit rate in video coding. The selection of optimum motion vectors (MV) has a significant impact on the quality of the resulted compressed video, in Rate-Distortion (R-D) sense. The established method uses the Lagrange multiplier to optimally select the MV for each block. However, it does not consider the effect of residual coding at the...
Motion estimation, one of the most effective modules in H.264/AVC, constitutes 60%-90% of encoding time and computation. Close to %45 of this computation belongs to Fractional Motion Estimation (FME) which has to perform a time consuming half-pixel and quarter-pixel interpolation. In addition, interpolation is a major challenge for hardware implementation in real time, specially in mobile applications...
Digital image storage and transmission is widely used in consumer products, such as digital cameras and cellular phones, where low bit-rate coding is required. In any low bit-rate encoder, such as the JPEG2000 standard, the data truncation during the encoding process, and data loss during transmission will result in lost bit-planes, which will be normally replaced by zeros at the decoder. In this...
Discrete wavelet transform (DWT) is increasingly recognized in image/video compression standards, as indicated by its use in JPEG2000. The lifting scheme algorithm is an alternative DWT implementation that has a lower computational complexity. In this paper, a new high performance lifting-based architecture is presented for the 9/7 DWT engine. The proposed architecture has a balanced pipeline and...
The execution order of the main components in a JPEG2000 encoder, i.e. the coding sequence, plays a significant role in its performance, implementation cost and memory requirement. The coding sequence is mainly affected by the bit allocation strategy. Existing strategies either require a large working memory or can not be used in rate constrained applications. In this paper, an improved pre-compression...
In this paper, a new low complexity Rate-Distortion optimization algorithm has been proposed. The proposed method can be employed with non-convex curves as well as convex curves. The new technique has been used in a hardware implementation of a JPEG2000 encoder. Simulation results indicate that the proposed algorithm is less sensitive to the shape of R-D curves in comparison with current algorithms...
The discrete wavelet transform (DWT) is increasingly recognized in image and video compression standards, as indicated by its use in JPEG2000. The lifting scheme algorithm is an alternative DWT implementation that has a lower computational complexity. In this paper, a new lifting scheme DWT architecture with minimum resource requirements is presented. The proposed architecture is pipelined, modular,...
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