VVC Image File Format Transition Period Signaling
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Solution Overview
Problem
The VVC image file format and signaling of image transition effects face issues such as undefined transition periods, lack of interoperability for intra-coded images, incorrect handling of operating points, and restrictions on transition effects, which affect user experience and compatibility in slideshow applications.
Innovation Solution
The proposed solutions include signaling a recommended or mandatory transition period for image transitions, defining file brands and types that ensure intra-coded access units, and allowing multiple transition effects between images, thereby enhancing user experience and compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a transition period is specified for image transitions in a slideshow, then the user experience is improved by providing optimal transition timing, but the file format complexity increases due to additional syntax elements and signaling requirements
Solution Approach 1:
The patent introduces a transition period parameter (smt_transition_period) that can be signaled in the bitstream to control the duration of transitions between still pictures in a slideshow. This parameter allows flexible adjustment of transition timing to improve user experience while maintaining a structured format for encoding the parameter values.
2Adaptability or versatility
If multiple transition effects are allowed for image transitions, then the adaptability and user experience are improved, but the device complexity increases due to handling multiple effect types and their parameters
Solution Approach 1:
The patent enables dynamic selection of transition effects by introducing a transition effect type parameter (smt_transition_effect_type) that can specify different effect types (e.g., fade, wipe, dissolve). This allows the slideshow to adaptively apply different transition effects based on the desired presentation style while maintaining a systematic approach to managing multiple effect types through standardized syntax elements.
3Reliability
If file brands and types are defined to ensure intra-coded access units, then interoperability is improved, but the manufacturing precision requirements increase due to strict format compliance
Solution Approach 1:
The patent introduces file brand identifiers (e.g., 'vvc1' for VVC intra-coded still pictures) and image item type parameters that locally mark specific portions of the bitstream with their coding characteristics. This allows decoders to quickly identify and handle intra-coded access units without processing the entire bitstream, improving interoperability while maintaining manageable format compliance through localized metadata markers.
4Reliability
If operating point information is correctly handled in image items, then the reliability of video coding is improved, but the device complexity increases due to additional NAL unit processing requirements
Solution Approach 1:
The patent separates operating point information into distinct NAL units (e.g., VvcOperatingPointsInformationProperty) that can be independently processed and referenced. This extraction approach allows the operating point data to be handled separately from the main video data stream, improving coding reliability through dedicated processing while reducing overall device complexity by modularizing the information handling.
Data Source
AI summary
Systems, methods and apparatus for processing image data are described. One example method includes performing a conversion between a visual media file and a bitstream. The visual media file comprises image items each comprising a sequence of pictures according to a media file format, and the bitstream comprises access units each comprising one or more pictures each belonging to a layer according to a video coding format. The media file format specifies a suggested transition period of an image item to be applied for a transition between the image item and a next image item during displaying of the pictures as a slideshow.