Field Referencing Pattern Determination for Interlaced Video
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Solution Overview
Problem
Existing video encoding methods for interlaced content face inefficiencies when motion vectors include substantial fractional pixel units, leading to video compression below desired quality, increased bit rate, and inefficiencies in encoding and decoding.
Innovation Solution
A system and method that analyze motion vectors to determine a field referencing pattern based on statistics of fractional pel, half pel, and integer pel components, adapting thresholds and using an exception protocol to select an optimal reference field for encoding, which includes either a same parity field or a most recently coded reference field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the same parity field of a previously coded frame is used as a reference field during motion estimation or motion compensation, then the encoding process is simplified, but video compression quality deteriorates when motion vectors include substantial fractional pixel units
Solution Approach 1:
The patent implements dynamic selection of reference field patterns based on motion characteristics. The encoder analyzes motion vectors and dynamically switches between same-parity field referencing and alternative referencing strategies (such as using different parity fields or temporal reference pictures) depending on the magnitude of fractional pixel components. This dynamic adaptation resolves the contradiction by maintaining simple same-parity referencing when motion is minimal while switching to more complex referencing patterns when fractional pixel motion is substantial, thereby preserving both encoding simplicity where applicable and compression quality where required.
Solution Approach 2:
The patent changes the parameter of reference field selection based on motion vector analysis. When motion vectors indicate substantial fractional pixel displacement, the system alters the reference field pattern parameter from same-parity field to alternative reference patterns. This parameter change allows the encoder to adapt to varying motion conditions, maintaining compression quality without permanently complicating the encoding process for all frames.
2Adaptability or versatility
If video compression is performed below desired quality to handle fractional pixel motion vectors, then encoding flexibility is improved, but bit rate increases
Solution Approach 1:
The patent changes the reference field pattern parameter based on motion characteristics to maintain encoding flexibility without unnecessarily increasing bit rate. By analyzing motion vectors and selectively applying alternative reference patterns only when fractional pixel motion is substantial, the system achieves adaptability where needed while avoiding bit rate inflation for frames with minimal fractional motion.
Solution Approach 2:
The patent applies alternative reference field patterns partially - only when motion analysis indicates substantial fractional pixel components. For frames with minimal fractional motion, the simpler same-parity field referencing is maintained. This partial application of the more complex strategy avoids the bit rate penalty of universally applying alternative patterns while still providing adaptability when required by motion characteristics.
3Manufacturing precision
If increased bit rate is used to maintain video compression quality with fractional pixel motion vectors, then compression quality is improved, but transmission time and memory requirements increase
Solution Approach 1:
The patent dynamically changes the reference field pattern parameter based on motion vector analysis to maintain compression quality without increasing bit rate. By selectively applying alternative reference patterns only when fractional pixel motion exceeds thresholds, the system preserves quality for frames that need it while avoiding unnecessary bit rate increases for frames with minimal fractional motion, thereby reducing overall transmission time and memory requirements.
Data Source
AI summary
Several methods and a system to perform determination of a field referencing pattern are disclosed. In one aspect, a method is disclosed. A motion vector of a previously coded frame is analyzed using a processor and a memory. A statistic is updated based on whether the motion vector includes one or more of a fractional pel vertical component, a half pel vertical component, and an integer pel vertical component. A field referencing pattern of a target field is determined based on the statistic and an exception protocol.