Key Picture Detail Attenuation for Video Popping Reduction
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Solution Overview
Problem
Key picture popping effects occur due to discrepancies in spatial detail retention between intra-picture and inter-picture compressed video frames, leading to noticeable quality changes during playback, which existing approaches fail to adequately address.
Innovation Solution
A video encoding system filters key pictures to reduce detail relative to inter-picture compressed frames, using techniques such as adaptive low-pass filtering or blending with decoded inter-picture compressed versions, to make video quality more uniform across frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If intra-picture compression is used for key pictures to maintain spatial detail, then picture quality is improved, but temporal discontinuities and popping effects occur when switching between key and non-key pictures
Solution Approach 1:
The patent applies preliminary action by filtering key pictures before encoding them. The filtering process is performed in advance on the key picture to reduce spatial detail, so that when the key picture is displayed after inter-picture compressed frames, the transition appears smoother and popping effects are minimized. This pre-processing step prepares the key picture to match the detail level of surrounding inter-picture frames.
Solution Approach 2:
The patent changes the parameter of spatial detail in key pictures by applying filtering operations that reduce high-frequency components. This parameter modification ensures that key pictures have comparable detail levels to inter-picture compressed frames, thereby reducing temporal discontinuities while maintaining acceptable picture quality.
2Stability of the object's composition
If filtering is applied to key pictures to reduce detail and minimize popping effects, then temporal quality consistency is improved, but spatial detail is reduced in key pictures
Solution Approach 1:
The patent applies local quality by selectively filtering only key pictures while leaving inter-picture compressed frames unchanged. The filtering operation is applied locally to specific frames (key pictures) rather than to all frames uniformly, allowing different quality characteristics to be optimized for different frame types in the video sequence.
3Manufacturing precision
If key pictures are encoded at higher quality to maintain spatial detail, then picture fidelity is improved, but bit rate increases
Solution Approach 1:
The patent applies preliminary action by filtering key pictures before encoding. This pre-filtering reduces the spatial detail in key pictures, which subsequently allows the encoder to achieve acceptable picture fidelity at lower bit rates. The filtering step prepares the picture data in advance, reducing the compression burden during the encoding process.
Solution Approach 2:
The patent changes the parameter of spatial detail through filtering, which directly impacts the bit rate requirement. By reducing high-frequency content in key pictures through filtering, the patent enables lower bit rate encoding while maintaining sufficient picture quality, as the filtered pictures require fewer bits to represent the reduced detail content.
Data Source
AI summary
Techniques and tools are described for reducing key picture popping effects. In some embodiments, an encoding system filters a video picture that is to be encoded as a key picture using intra-picture compression. The filtering reduces detail in the picture relative to other video pictures that are to be encoded using inter-picture compression. In many cases, the filtering reduces key picture popping effects by selectively attenuating detail in the picture that is to be encoded as a key picture. The encoding tool can use a key picture filter strength parameter to control strength of the filtering. The tool encodes the filtered video picture using intra-picture compression and encodes the other video pictures using inter-picture compression.