HDR SDR Image Signal Characteristics Metadata Transmission
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Solution Overview
Problem
Existing methods for transmitting HDR and SDR images through broadcasting fail to ensure that receiving devices can appropriately display these images, leading to potential visual discomfort and improper dynamic range representation.
Innovation Solution
A transmission method that includes obtaining an image and image signal characteristics information indicating either an opto-electrical transfer function (OETF) or an electro-optical transfer function (EOTF), and then transmitting a signal containing the image and this information, allowing receiving devices to correctly display HDR and SDR images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HDR and SDR images are transmitted through broadcasting without including image signal characteristics information, then the transmission bandwidth is reduced and the system is simpler, but the receiving device cannot appropriately display these images
Solution Approach 1:
The transmitting device performs preliminary encoding by embedding image signal characteristics information (OETF or EOTF) into the broadcast signal before transmission. This preliminary action ensures that the receiving device has all necessary information to accurately decode and display HDR and SDR images without requiring complex real-time analysis or additional communication channels.
Solution Approach 2:
The image signal characteristics information acts as an intermediary element that bridges the transmitting and receiving devices. This metadata includes OETF or EOTF parameters that mediate the conversion between different dynamic ranges, enabling the receiving device to appropriately process and display images regardless of whether they are HDR or SDR formats.
2Reliability
If image signal characteristics information is included in the transmitted signal, then the receiving device can appropriately display HDR and SDR images, but the transmission bandwidth and signal complexity increase
Solution Approach 1:
Rather than transmitting complete image signal characteristics for every image, the system applies local quality optimization by selectively including only the necessary OETF or EOTF parameters in the metadata. This approach provides just enough information for accurate display without unnecessarily increasing the transmitted data quantity, balancing reliability with data efficiency.
3Adaptability or versatility
If the receiving device converts between HDR and SDR without proper image signal characteristics information, then display flexibility is improved, but visual discomfort increases and image quality deteriorates
Solution Approach 1:
The system implements feedback by embedding image signal characteristics information that tells the receiving device how the image was encoded (OETF or EOTF). This feedback mechanism enables the receiving device to perform accurate conversions between HDR and SDR formats while maintaining image quality and avoiding visual discomfort, as the conversion process is guided by the transmitted characteristics data.
Data Source
AI summary
A transmission method in the present disclosure includes; obtaining an image and image signal characteristics information indicating one of an opto-electrical transfer function (OETF) or an electro-optical transfer function (EOTF) as image signal characteristics of the image; and transmitting a signal including the image and the image signal characteristics information. According to the transmission method in the present disclosure, a receiving device that received a high dynamic range (HDR) image and a standard dynamic range (SDR) image transmitted through broadcasting or the like can display these images appropriately.