Video Transmitter and Receiver for Gamma-Based Luminance Conversion
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Solution Overview
Problem
Existing technologies struggle to achieve appropriate luminance dynamic range in display due to limitations in synchronous reproduction of luminance levels during image transmission.
Innovation Solution
A transmitting device applies a gamma curve to input video data with a level range from 0% to 100%*N, and transmits this data with auxiliary information for converting high-luminance levels on the receiving side, allowing the receiving device to adjust the luminance range appropriately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If gamma curve is applied to input video data to obtain transmission video data, then the luminance dynamic range is improved, but the high-luminance level conversion is lost
Solution Approach 1:
Auxiliary information is introduced as an intermediary carrier to transmit the high-luminance level conversion parameters from the transmitting device to the receiving device. This auxiliary information acts as a mediator that preserves the necessary conversion data without affecting the main video data transmission, thus resolving the contradiction between improving luminance dynamic range and preventing information loss.
2Ease of operation
If transmission video data is transmitted without auxiliary information, then the transmission is simple, but the receiving device cannot convert high-luminance levels appropriately
Solution Approach 1:
The transmission system is segmented into two independent parts: the main video data stream and the auxiliary information stream. The auxiliary information is separately transmitted alongside the video data, allowing the receiving device to process and apply the high-luminance level conversion independently. This segmentation maintains transmission simplicity while enabling adaptive conversion capability.
3Illumination intensity
If the receiving device applies gamma curve to input video data, then the luminance dynamic range is improved, but the synchronous reproduction of luminance minimum and maximum levels is lost
Solution Approach 1:
The transmitting device performs preliminary action by applying the gamma curve to the input video data before transmission. This preliminary processing transforms the luminance levels in advance, and the auxiliary information carries the conversion parameters needed for the receiving device to reverse the transformation. This preliminary action enables the receiving device to restore synchronous reproduction of luminance levels while maintaining improved luminance dynamic range.
Data Source
AI summary
Display with an appropriate luminance dynamic range is realizable on a receiving side. A gamma curve is applied to input video data having a level range from 0% to 100%*N (N: a number larger than 1) to obtain transmission video data. This transmission video data is transmitted together with auxiliary information used for converting a high-luminance level on the receiving side. A high-level side level range of the transmission video data is converted on the receiving side such that a maximum level becomes a predetermined level based on the auxiliary information received together with the transmission video data.