Orientation-Aware Video Encoding for Non-Horizontal Motion
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Solution Overview
Problem
Existing video encoding technologies face inefficiencies when handling non-natural and natural video content with non-horizontal motion patterns, as they are often optimized for horizontal motion, leading to reduced quality and increased computational resources.
Innovation Solution
The technique involves rotating video content before encoding and rotating it back after decoding, while incorporating rotation information into the bitstream to account for the orientation of each shot, allowing for optimized encoding and decoding processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If video encoding is optimized for horizontal motion patterns, then encoding efficiency for natural video is improved, but video quality deteriorates when handling non-natural content with non-horizontal motion
Solution Approach 1:
The encoder dynamically adapts its motion processing orientation based on the detected motion pattern in the video content. By determining whether the dominant motion is horizontal or vertical and adjusting the encoding orientation accordingly, the system achieves high encoding efficiency for both natural video (horizontal motion) and non-natural video (vertical motion) without sacrificing video quality in either case.
Solution Approach 2:
The system changes the encoding parameters (specifically the orientation of motion compensation and transformation) based on the detected motion characteristics. When vertical motion is detected, the encoder switches from the default horizontal optimization to a vertical orientation, effectively changing the processing parameters to match the content requirements and resolve the quality- efficiency contradiction.
2Manufacturing precision
If encoding parameters are re-tuned for non-horizontal motion, then video quality for non-natural content is improved, but device complexity and computational resources increase
Solution Approach 1:
The system performs preliminary motion analysis at the shot level to detect the dominant motion orientation before the main encoding process. By determining whether vertical motion compensation is needed in advance, the encoder can configure itself appropriately without requiring extensive re-tuning of parameters, thus improving video quality for non-natural content while minimizing the increase in device complexity.
Solution Approach 2:
The video is divided into shots, and the motion orientation is determined for each shot independently. This segmentation allows the encoder to apply vertical motion compensation only where needed (in non-natural content with vertical motion) rather than throughout the entire video, reducing the overall computational burden and device complexity while still improving video quality for relevant segments.
3Manufacturing precision
If vertical motion compensation is implemented, then encoding quality for non-natural video is improved, but computational resources and processing time increase
Solution Approach 1:
The system applies vertical motion compensation partially - only to shots where vertical motion is detected as dominant. By using a motion analysis step to identify which shots require vertical compensation, the system avoids applying the computationally expensive vertical motion processing to all video content, thus improving encoding quality for non-natural video while limiting the increase in computational resources to only when necessary.
Data Source
AI summary
An encoder may be tuned to handle video where most of the motion is horizontal. Re-tuning an encoder to content with non-horizontal motion is a difficult process. Instead of re-tuning the process, a solution for coding video content may include rotating a video before encoding it and rotating it back after decoding its compressed bitstream. This solution can allow encoders to consider the suitable orientation of each shot and apply different encoding parameters based on whether the shot needs to be rotated. Similarly, the solution may allow decoders to correctly display the video by rotating the decoded video data to the original orientation. Rotation information may be written into the encoded video bitstream, such as in a sequence header Open Bitstream Unit.