Adaptive Reference Picture Selection for Interlaced Video
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Solution Overview
Problem
Current video encoders face challenges in selecting the most appropriate reference picture for motion estimation in interlaced video, as they often require motion estimation with respect to the same reference picture for every macroblock, which is inefficient and limits video compression efficiency.
Innovation Solution
An adaptive system that generates a control signal based on inter-picture motion measurement to select the best reference picture between a temporally previous picture of opposite parity and a previous picture of the same parity, optimizing motion estimation by analyzing low-resolution inter-picture motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If motion estimation is performed with respect to the same reference picture for every macroblock, then implementation efficiency is improved, but video compression efficiency deteriorates
Solution Approach 1:
The patent implements dynamic reference picture selection by introducing a motion measurement unit that calculates inter-picture motion for each picture pair. Based on the motion magnitude, the system dynamically selects between different reference pictures (same parity or opposite parity) for motion estimation, rather than using a fixed reference picture for all macroblocks. This dynamic adaptation resolves the contradiction by allowing the system to optimize compression efficiency through intelligent reference selection while maintaining implementation feasibility through automated control.
Solution Approach 2:
The patent changes the parameter of reference picture selection from a static, uniform choice to a dynamic, content-adaptive choice. By introducing motion measurement as a controlling parameter, the system adjusts which reference picture (same parity or opposite parity) is used based on the actual motion characteristics of each picture pair. This parameter change enables the system to achieve better compression efficiency without sacrificing implementation efficiency, as the selection is automatically determined by motion metrics.
2Productivity
If all possible reference pictures are used for motion estimation, then video compression efficiency is improved, but device complexity increases
Solution Approach 1:
Instead of exhaustively evaluating all possible reference pictures for every macroblock, the patent applies partial action by first performing a low-resolution motion search to obtain a motion measurement. This preliminary, partial evaluation provides sufficient information to select the appropriate reference picture category (same parity or opposite parity), avoiding the need to perform full motion estimation with all possible references. This approach achieves good compression efficiency while keeping device complexity manageable through selective, rather than exhaustive, reference picture evaluation.
3Speed
If reference picture selection is performed before motion estimation, then processing speed is improved, but adaptability deteriorates
Solution Approach 1:
The patent applies preliminary action by performing a low-resolution motion measurement before the full motion estimation process. This preliminary step quickly determines the motion characteristics of the picture pair and selects the appropriate reference picture category in advance. By performing this preliminary selection based on motion measurement, the system maintains processing speed (avoiding exhaustive search) while achieving adaptability (selecting the most appropriate reference picture based on actual motion content).
Data Source
AI summary
An apparatus comprising a first circuit and a second circuit. The first circuit may be configured to generate a control signal in response to a measurement of inter-picture motion between a current picture and a first reference picture. The second circuit may be configured to select the first reference picture or a second reference picture as a better reference picture for motion estimation in response to the control signal.