P-Frame Random Access via Reference Frame Segmentation
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Solution Overview
Problem
Conventional video random access technologies rely solely on I-frames, making P-frames inaccessible and inefficient for applications like security control systems where storage space is critical and rapid random access is necessary, leading to suboptimal performance in fields like CCTV video processing.
Innovation Solution
A method is introduced to make P-frames random accessible by generating a random access reference frame based on intraframe and interframe encoding, which is inserted into the header area of video data packets or a metadata file, allowing for efficient decoding of P-frames without relying on preceding P-frames, thus ensuring uniform response time and reducing storage burden.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If I-frames are used for random access, then random accessibility is improved, but storage space consumption increases
Solution Approach 1:
The patent segments the reference frame functionality by creating a dedicated random access reference frame (RAREF) that is separate from the main video frame sequence. This RAREF contains only the essential reference data needed for random access to P-frames, dividing the storage burden between the compressed video data and this separate, minimal overhead structure.
Solution Approach 2:
The patent creates a simplified copy of reference frame data specifically tailored for random access purposes. Instead of storing complete I-frames or multiple P-frames, it copies and stores only the necessary reference information in the RAREF, which can then be used to decode any P-frame in the sequence without requiring the original full-resolution reference frames.
2Loss of time
If P-frames are made random accessible, then response time is improved, but decoding complexity increases
Solution Approach 1:
The patent performs preliminary organization of reference frame data during the encoding phase. The RAREF is constructed in advance with all necessary reference information properly structured and indexed, so that during random access decoding, the system simply needs to retrieve and use this pre-prepared data without performing complex real-time analysis or reconstruction of reference frames.
3Quantity of substance
If I-frames are reduced in number, then storage efficiency is improved, but random access capability deteriorates
Solution Approach 1:
The RAREF structure serves multiple functions simultaneously: it enables random access to any P-frame in the sequence, provides reference data for decoding, and maintains a compact size that doesn't significantly increase storage requirements. This single structure replaces the need for multiple I-frames while preserving random access capability across the entire video sequence.
Data Source
AI summary
The invention generally relates to a method of providing random access for video data in which a P-frame of the video data is configured to be random accessible in addition to I-frames. More specifically, the invention relates to a method of providing random access for video data in which a P-frame is configured to be random accessible based on a random access reference frame which is provided via a separate channel such as header area of video data packets or a metadata file, whereby the random access for video data may be effectively provided with overcoming the conventional video random access technology depending on the I-frame only. The invention makes it possible to configure a P-frame random accessible simply by accompanying a random access reference frame of small datasize, whereby video compression ratio may be improved due to smaller numbers of I-frames being included in video data than conventional arts.