SDR to HDR Content Conversion via Metadata Gamma Correction
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Solution Overview
Problem
Existing display apparatuses fail to accurately convert Standard Dynamic Range (SDR) content into High Dynamic Range (HDR) content due to lack of gamma information, leading to incorrect conversion and display.
Innovation Solution
A content outputting apparatus that communicates with a display apparatus, receives metadata, acquires image quality information, and uses content conversion information, such as a lookup table, to convert SDR pixel values into HDR pixel values, ensuring accurate gamma correction and outputting HDR content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display apparatus converts SDR content into HDR content using existing gamma correction technology, then the content can be displayed on HDR-capable displays, but the conversion accuracy deteriorates because the gamma information applied to the SDR content is unknown
Solution Approach 1:
The content outputting apparatus performs the gamma correction conversion of SDR content to HDR content in advance, before transmission to the display apparatus. By acquiring the gamma information from metadata and performing the conversion using lookup tables beforehand, the system ensures accurate conversion without requiring the display apparatus to perform inaccurate real-time conversion
Solution Approach 2:
The patent introduces metadata as an intermediary carrier that transmits gamma information from the content source to the content outputting apparatus. This intermediary enables the acquisition of previously unknown gamma information, allowing accurate conversion while maintaining HDR display capability
2Ease of operation
If the display apparatus uses gamma information applicable to the display apparatus for conversion, then the conversion process can be performed, but the conversion result deteriorates because it does not consider the gamma information applied to the SDR content
Solution Approach 1:
The content outputting apparatus acquires gamma information from metadata and performs the complete SDR to HDR conversion in advance, generating properly gamma-corrected HDR content before transmission. This eliminates the need for the display apparatus to perform additional conversion operations, ensuring both ease of operation and high conversion accuracy
Solution Approach 2:
The patent replaces the display apparatus's gamma correction mechanism with a pre-processing conversion mechanism at the content outputting apparatus. By using lookup tables and metadata-driven gamma information, the system substitutes the inaccurate display-side conversion with accurate source-side conversion
Data Source
AI summary
An apparatus for outputting a content to a display, including a communicator configured to perform a data communication with the display; an input interface configured to receive an input content and metadata associated with the input content; and a processor configured to acquire image quality information applied to the content based on the metadata, to convert the input content into a converted content outputtable on the display by using content conversion information related to the acquired image quality information, and to control the communicator to output the converted content to the display.