A 64 mW High Picture Quality H.264/MPEG-4 Video Codec IP for HD Mobile Applications in 90 nm CMOS

Computation-constrained dynamic search range control for real-time video encoder

“…Practical hardware architectures for real-time video applications [25,26] are often designed to work using a specific parallel granularity (typically MB level, slice level or frame level). To guarantee real-time processing, video processing algorithms are partitioned into several tasks and mapped into a specific parallel structure based on their computing requirements.…”

“…(25)) and the relationship between computational complexity and PMV deviation (Eq. (22)), the computation budgett i;j k ð Þ allocated for the ith MB in the jth BPU are determined based on the square of PMV deviations, the average computational complexity and the available remaining computation budget, and can be calculated bŷ…”

“…(9) Step 4.2: If it is the first MB in the BPU, initialize the remaining computation budget T 1;j k ð Þ ¼ T unit and the average computational complexitỹ Γ 1;j k ð Þ ¼Θ j k ð Þ; else, updating the remaining computation budget T i;j k ð Þ and computational complexityΓ i;j k ð Þ by Eqs. (25) and (27) Step 4.3: Calculate the allocated computation budgett i;j k ð Þ by Eq. (26).…”

“…In real-time video application, ME is mostly implemented as a dedicated hardware accelerator [22][23][24] in which processing is guaranteed to finish within strict time constraint to permit search for the best matching block. To achieve the highest degree of parallelism, pipelined architectures [25,26] are the most commonly used techniques for hardware accelerators. The pipeline is designed to maximize the system throughput while satisfying latency and resource constraints.…”

A Dynamic Quality-Adjustable H.264 Video Encoder for Power-Aware Video Applications

“…They are designed for one specific application for either HD video with high video resolution or portable video with smaller video resolution. Another dual-mode video codec design [10] supporting H.264/MPEG-4 not only satisfied HD720 (1280 × 720) video encoding, but also achieved the low power consumption. However, it was still designed for middle or high video resolution with good picture quality.…”