Video Decoder Trick Mode Artifact Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Compressed video streams exhibit artifacts such as motion jitter and discontinuous objects during trick playback modes due to the display of interlaced video fields, which existing decoding and display methods often address by showing one field twice or scaling it vertically, compromising picture quality.
Innovation Solution
A system and method that detect the original scan format of video frames and display both fields of interlaced pictures during trick modes, using a scan mode flag in the picture header to ensure accurate formatting and reduce artifacts, thereby maintaining higher picture quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If pictures are displayed multiple times consecutively during trick modes, then trick mode playback is achieved, but motion jitter and discontinuous objects occur due to interlaced video field display
Solution Approach 1:
The patent segments the interlaced picture into two separate fields (top field and bottom field) and processes them independently. During trick mode playback, each field is displayed separately in consecutive picture display intervals, preventing the motion jitter and discontinuous objects that occur when the complete interlaced picture is displayed repeatedly. This segmentation allows the system to maintain trick mode playback functionality while eliminating picture quality degradation.
2Ease of operation
If only one field is displayed twice or scaled vertically to address motion jitter, then picture quality is compromised, but trick mode playback continues
Solution Approach 1:
The patent implements periodic action by alternating the display of different fields across consecutive picture display intervals during trick mode playback. Instead of displaying the same field repeatedly or scaling a single field, the system periodically switches between displaying the top field and bottom field, creating a sequence that maintains picture quality while enabling continuous trick mode operation. This periodic field switching preserves both operational ease and picture quality.
Data Source
AI summary
A video decompression system and method are disclosed. In one preferred embodiment, the video decompression system comprises a memory with logic, and a processor configured with the logic to receive a compressed video stream that includes frame pictures and detect a scan mode indicator in the compressed video stream, wherein the scan mode indicator indicates whether a progressive scan format was used during the creation of the frame pictures.