Video Encoder Repeated Field Detection for DVD Compression
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Solution Overview
Problem
Conventional video encoders fail to efficiently convert video sequences with repeated fields into sequences with repeated frames, leading to reduced video quality and increased data storage requirements due to poor compression and resolution issues, especially when converting 24 fps film to 30 fps video for DVD storage.
Innovation Solution
A method that detects repeated fields in a video sequence and generates repeated frames from adjacent fields within a film frame, allowing for better vertical resolution and reduced jerkiness by encoding all common intermediate format frames from both fields of a film frame, enabling easier compression and fewer bits for a given quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional video encoders are used to encode video sequences with repeated fields, then the encoding process is simple, but the vertical resolution is poor and video quality is reduced
Solution Approach 1:
The patent applies preliminary action by detecting repeated fields in the video sequence before the actual encoding process. The system identifies which fields are repeats and generates repeated frames from adjacent fields within a film frame in advance, so that when encoding occurs, the repeated frame information is already prepared and can be directly used, improving vertical resolution without significantly increasing encoding complexity
Solution Approach 2:
The patent segments the video sequence processing into distinct stages: first detecting repeated fields, then generating repeated frames from adjacent fields, and finally encoding the processed sequence. This segmentation allows each stage to be optimized independently, with the repeated frame generation stage specifically targeting vertical resolution improvement while maintaining overall encoding efficiency
2Productivity
If repeated fields are not converted to repeated frames, then the encoding process remains simple, but compression efficiency is reduced and more data is required for storage
Solution Approach 1:
The system performs preliminary detection of repeated fields and generation of repeated frames before compression. By identifying repeated fields in advance and creating corresponding repeated frames from adjacent fields, the encoder can apply more efficient compression algorithms to the pre-processed sequence, improving compression efficiency and reducing the final data size required for storage
Solution Approach 2:
The patent changes the temporal parameters of the video sequence by converting repeated fields into repeated frames. This parameter transformation allows the compression algorithm to work with frame-based repetition rather than field-based repetition, significantly improving compression efficiency and reducing the quantity of data that needs to be stored on the DVD
3Reliability
If film is converted to video using conventional methods, then the conversion process is straightforward, but jerkiness is increased and video quality is reduced
Solution Approach 1:
The patent applies preliminary action by detecting repeated fields and generating repeated frames from adjacent fields within a film frame before the video conversion and encoding process. This pre-processing step ensures that the temporal relationships and motion continuity are preserved during conversion, eliminating jerkiness and maintaining high video quality while keeping the conversion process straightforward
Data Source
AI summary
A method for encoding video, comprising the steps of (A) detecting repeated fields in a video sequence and (B) generating a first repeated frame from a top field and any adjacent bottom field based upon detection of the repeated fields, wherein the top field and the bottom field are from one film frame.