Hybrid Encoder for Interlaced Progressive Video with Lookahead
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Solution Overview
Problem
Current video compression standards, such as HEVC, do not efficiently handle transitions between interlaced and progressive video content, leading to poor compression ratios and increased costs due to the need for intra pictures during mode transitions.
Innovation Solution
A hybrid encoder system that parses video signals into segments, encoding them in both frame and field modes, and uses lookahead to optimize coding by calculating interlaced degree costs and determining access points for efficient switching between modes, allowing for single pass encoding with parallel all-field and all-frame coding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If video transitions between interlaced and progressive formats are handled using conventional encoding methods, then the video can be encoded, but compression ratio deteriorates and intra pictures are required during mode transitions
Solution Approach 1:
The video sequence is divided into segments with different coding modes (interlaced or progressive) based on content analysis. Each segment is independently encoded with the appropriate mode, avoiding the need for intra pictures during transitions and improving overall compression efficiency.
Solution Approach 2:
A lookahead buffer analyzes future video content before encoding to predict format transitions. This preliminary analysis allows the encoder to prepare for mode changes in advance, optimizing segment boundaries and avoiding inefficient intra picture insertion during transitions.
2Loss of energy
If conventional encoding without lookahead is used, then encoding speed is maintained, but compression efficiency deteriorates due to inability to optimize mode transitions
Solution Approach 1:
The lookahead buffer performs preliminary analysis of upcoming video content to identify format transitions and optimal segment boundaries before actual encoding. This advance preparation enables compression optimization without requiring multiple re-encoding passes, maintaining single-pass encoding speed.
Solution Approach 2:
The encoder dynamically adjusts coding mode and segment boundaries based on real-time content analysis from the lookahead buffer. This dynamic adaptation allows optimal compression for each video segment while maintaining encoding speed through a single pass processing approach.
3Reliability
If intra pictures are inserted during mode transitions to ensure decoding compatibility, then decoding reliability is improved, but compression ratio deteriorates
Solution Approach 1:
The video is segmented into interlaced and progressive portions with clear boundaries. By carefully positioning segment boundaries at natural transition points identified through lookahead analysis, the encoder maintains decoding compatibility without requiring additional intra pictures, thus preserving compression efficiency.
Solution Approach 2:
The encoder uses feedback from the lookahead buffer about upcoming content to make informed decisions about mode transitions. This feedback mechanism ensures that transitions occur at optimal points that maintain decoding compatibility while avoiding the need for redundant intra pictures.
Data Source
AI summary
An apparatus includes an interface and a circuit. The interface may be configured to receive a video signal comprising a plurality of interlaced fields and a plurality of progressive frames. The circuit may be configured to (i) generate a plurality of segments by parsing the video signal, (ii) encode the segments as both (a) a plurality of frame segments in a frame mode and (b) a plurality of field segments in a field mode and (iii) generate an encoded signal based on the frame segments and the field segments.