Region-wise Packing Signaling Scale Factor
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Solution Overview
Problem
The existing solutions for signaling region-wise packing information in the Omnidirectional Media Format (OMAF) have a large signaling overhead, particularly due to the expensive bit cost in the fields of RectRegionPacking, which results in inefficient data transmission.
Innovation Solution
A method is introduced to signal region information in a bitstream using a common scale factor for all regions, reducing the bit size required for signaling height, width, top offset, and left offset by applying the scale factor to these values and signaling the scaled values, along with flags to indicate whether all regions have the same size or are in raster scan order.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If region information is signaled using full precision fields in RectRegionPacking, then measurement precision is maintained, but loss of information increases due to large signaling overhead
Solution Approach 1:
The patent changes the parameter representation by introducing a scale factor that transforms absolute region coordinates into relative scaled values. Instead of signaling full precision coordinates directly, the encoder signals a scale factor and then signals reduced-precision relative coordinates that are reconstructed at the decoder by applying the scale factor. This parameter transformation maintains measurement precision while reducing signaling overhead.
Solution Approach 2:
The scale factor acts as an intermediary between the original high-precision region coordinates and the compressed representation. By introducing this intermediate scaling parameter, the system can transmit region information with less direct precision while still achieving accurate reconstruction through the scaling relationship.
2Manufacturing precision
If all region parameters are signaled explicitly, then manufacturing precision is maintained, but loss of substance increases due to larger bitstream size
Solution Approach 1:
The patent transforms the parameter set by introducing a scale factor and using it to derive actual region parameters. Instead of signaling width, height, top offset, and left offset with full precision for each region, the system signals these parameters in a scaled-down form and reconstructs the actual values by applying the scale factor, thereby reducing bitstream size while maintaining positioning accuracy.
Solution Approach 2:
The scale factor serves as a universal parameter that applies to all region parameters (width, height, top offset, left offset). By using this single multi-functional scaling parameter, the system can maintain precision across multiple different region dimensions without repeating full precision signaling for each parameter individually.
3Reliability
If detailed region information is transmitted for each region, then reliability is improved, but productivity decreases due to increased data transmission requirements
Solution Approach 1:
The patent changes how region parameters are represented by introducing a scale factor mechanism. This allows the system to transmit fewer bits per region while maintaining decoding accuracy, thereby improving data transmission efficiency without sacrificing reliability. The scaled parameters are reconstructed at the decoder to achieve the same level of accuracy as full-precision signaling.
4Measurement precision
If full precision region parameters are used, then measurement precision is maintained, but device complexity increases due to larger data structures
Solution Approach 1:
The patent simplifies the data structure by introducing a scale factor that allows compact representation of region parameters. Instead of storing and transmitting large full-precision coordinate values for each region, the system uses the scale factor with smaller scaled values, reducing memory requirements and data structure complexity while maintaining the same measurement precision through the scaling relationship.
Data Source
AI summary
There are provided mechanisms for signaling region information in a bitstream for region-wise unpacking of regions from a packed picture to a projected picture. The method comprises defining a scale factor that is common for all regions of a picture. The method comprises signaling the scale factor in the bitstream. The method further comprises, for each of at least one region of a picture, applying the scale factor to each item of the region information for the region to produce a set of scaled values. The method comprises signaling the scaled values in the bitstream. Mechanisms for parsing region information from a bitstream for region-wise unpacking of regions from a packed picture to a projected picture are also provided.