HDR to SDR Image Conversion via Normalization and Linearization
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Solution Overview
Problem
Non-HDR television receivers cannot display HDR content effectively, resulting in a poor image display effect due to incompatibility between HDR and SDR technologies.
Innovation Solution
A method and television terminal that convert HDR image data into SDR image data through normalization, linearization, and format conversion, allowing HDR content to be displayed on non-HDR devices with improved image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If HDR technology is used to expand color gamut and dynamic range, then image quality and color accuracy are improved, but compatibility with existing SDR receivers deteriorates
Solution Approach 1:
The patent introduces an intermediary conversion process that transforms HDR image data into SDR format through normalization and linearization operations. This mediator enables SDR receivers to display HDR content by converting the incompatible HDR format into a compatible SDR format while preserving as much image quality as possible through the conversion process
Solution Approach 2:
The patent changes the parameters of the image data by normalizing the HDR values to SDR-compatible ranges and applying linearization transformations. This parameter transformation allows the image data to be rendered on SDR displays while maintaining the benefits of HDR processing through mathematical conversion
2Ease of operation
If HDR content is displayed on non-HDR TVs without conversion, then transmission simplicity is maintained, but image display quality deteriorates with pale effect and lost contrast
Solution Approach 1:
The patent performs preliminary conversion of HDR image data to SDR format at the transmitter or processing stage before transmission to SDR receivers. This preliminary action ensures that the image data is pre-processed for SDR compatibility, eliminating the need for complex real-time conversion at the display device while maintaining image quality
Data Source
AI summary
Disclosed is a method for converting an HDR image into an SDR image. The method includes the following operations: acquiring, by a television terminal, input HDR image data, and processing, by the television terminal, the acquired HDR image data through a first normalization; linearizing, by the television terminal, the HDR image data processed through the first normalization; processing, by the television terminal, the linearized HDR image data through a second normalization; and converting, by the television terminal, the HDR image data processed through the second normalization into SDR image data with a supported format. The present disclosure further provides a television terminal and a computer readable storage medium. The present disclosure effectively avoids the technical problem of a poor image display effect caused by that the non-HDR receivers cannot show the HDR effect. The present disclosure enables non-HDR receivers to show the HDR effect and improves the image display effect.