Distortion Change Determination in Synthesized Views
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Solution Overview
Problem
Existing technologies lack an exact method to determine the distortion change in synthesized views due to depth map modifications, which is crucial for rate/distortion optimization in 3D video systems.
Innovation Solution
An apparatus and method to calculate the distortion change in synthesized views by computing the difference in distortion between the current and possible successor synthesis states, considering depth map modifications from one state to another.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If depth map modifications are performed for compression or processing, then transmission bandwidth is reduced, but distortion in synthesized views increases
Solution Approach 1:
The patent implements a feedback mechanism where the distortion measure calculated from depth map modifications is used to adjust encoding parameters. The encoder uses the calculated distortion values to make rate-distortion optimization decisions, creating a closed-loop system that balances compression efficiency with synthesized view quality.
Solution Approach 2:
The patent changes encoding parameters based on the calculated distortion measures. By adjusting quantization parameters, encoding rates, or other compression parameters according to the measured distortion, the system optimizes the trade-off between bandwidth consumption and synthesized view quality dynamically.
2Manufacturing precision
If exact distortion determination methods are implemented, then synthesized view quality is improved, but computational complexity increases
Solution Approach 1:
The patent segments the distortion calculation process into manageable components. Instead of calculating complete synthesized views and comparing them pixel-by-pixel, the method divides the calculation into smaller steps involving depth map block processing, selective region identification, and incremental distortion accumulation, reducing overall computational complexity.
Solution Approach 2:
The patent applies local quality assessment by focusing distortion calculations on specific regions of the depth map that have the greatest impact on synthesized view quality. Rather than uniformly processing the entire depth map, the method identifies and prioritizes critical regions, reducing computational load while maintaining measurement accuracy.
3Productivity
If depth map compression is applied, then transmission rate is reduced, but distortion in the depth map increases
Solution Approach 1:
The patent uses feedback from distortion measurements to control the compression process. The calculated distortion values inform encoding decisions, allowing the system to adjust compression aggressiveness based on the actual impact on synthesized view quality, thereby optimizing the trade-off between transmission rate and depth map accuracy.
Data Source
AI summary
An apparatus for determining a measure for a distortion change of a first view synthesized from a second view, caused by a modification of a depth map of the second view from a first state to a second state, is configured—starting from a current synthesis state of the first view corresponding to a synthesis from the second view having the depth map modified to the second state in an already processed portion of the depth map and having the depth map unmodified at the first state in a yet to be processed portion of the depth map—to compute a possible successor synthesis state corresponding to a synthesis of the first view from the second view having the depth map modified to the second state in an already processed portion plus a currently processed portion and having the depth map unmodified at the first state in the yet to be processed portion without the currently processed portion; and to determine a distortion change of a distortion of the current synthesis state of the first view relative to an undistorted version of the first view to a distortion of the possible successor synthesis state of the first view relative to the undistorted version of the first view.