Field Deinterlace Trick Mode Sequence for Video Artifacts
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Solution Overview
Problem
Trick mode playback of pre-encoded video content often results in interlace artifacts, causing distracting flicker due to the display of alternating interlaced fields, especially when the content originates from an interlaced source.
Innovation Solution
Implementing a field deinterlace trick mode sequence that uses pairs of P-repeat field pictures, where one field serves as a reference for both, ensuring both displayed fields show the same image, thereby eliminating flicker.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If traditional trick mode playback displays alternating interlaced fields, then the display is updated at high frequency, but interlace artifacts and flicker occur when content originates from interlaced sources
Solution Approach 1:
The patent segments the interlaced field data into separate odd and even fields, then recombines them in a modified sequence. By dividing the original field structure and reorganizing the display sequence, the patent eliminates the harmful alternating field effect while preserving the high update rate for smooth playback.
Solution Approach 2:
The patent changes the display parameter by showing the same field (either odd or even) twice in succession instead of alternating between odd and even fields. This parameter modification transforms the display sequence from alternating fields to repeated fields, eliminating flicker while maintaining the required display update frequency.
2Ease of manufacture
If both fields are displayed for trick mode sequences, then the decoder can use standard inter-coded pictures, but alternating fields create distracting flicker
Solution Approach 1:
Instead of following the traditional approach of displaying alternating odd and even fields, the patent inverts the sequence by displaying the same field twice in succession. This inversion of the display sequence maintains decoder compatibility while eliminating the flicker effect caused by alternating fields.
3Stability of the object's composition
If intra-coded pictures are used for trick mode sequences, then image stability is improved, but re-encoding increases processing complexity
Solution Approach 1:
The patent creates a copy of the field data by displaying the same field twice in succession rather than re-encoding the entire picture. This copying approach achieves image stability similar to intra-coded pictures while avoiding the complex re-encoding process, as it operates at the field display level rather than requiring full picture re-compression.
Data Source
AI summary
A system and method for reducing interlace artifacts during trick mode playback of pre-encoded content. The system and method operate a decoder to receive a video signal, configured as frames, with each frame having a plurality of interlaced fields, and to provide a video output in interlaced format or trick mode format. When operating in a normal mode, the decoder provides the video output in the interlaced format. When operating in trick mode, the decoder is instructed to use one of the fields of a frame as a reference field, and outputs a video output frame in the trick mode format where both fields of the video output frame are the same as the reference field. The video signal can be a streaming video or read from a medium.