HDR Tone Mapping Using OPR-Based Target Luminance
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Solution Overview
Problem
Conventional HDR tone mapping fails to account for the physical characteristics of the display and usage environment, leading to distorted image brightness and color that deviate from the content creator's intention.
Innovation Solution
An electronic device determines a target luminance based on the on-pixel ratio (OPR) and display set luminance, and performs HDR tone mapping to minimize brightness and color distortion, using methods such as infinite impulse response filtering and average value compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional HDR tone mapping relies on display set luminance, then the process is simple, but image brightness and color become distorted
Solution Approach 1:
The patent changes the parameter used for tone mapping from fixed display set luminance to dynamic target luminance calculated based on OPR. This parameter change enables the system to adapt to different display states and content characteristics, resolving the contradiction between simple processing and accurate image reproduction.
Solution Approach 2:
The patent introduces feedback by calculating OPR from actual pixel values and using this feedback to determine target luminance. This closed-loop approach ensures that tone mapping reflects the actual content being displayed, improving brightness and color accuracy while maintaining reasonable process complexity.
2Productivity
If HDR tone mapping uses static metadata, then processing is efficient, but image quality fails to reflect content creator's intention
Solution Approach 1:
The patent transitions from static metadata-based tone mapping to dynamic target luminance calculation based on OPR. This dynamic approach allows the system to adapt to different frames and content characteristics in real-time, improving image quality while maintaining efficient processing through direct pixel value analysis.
Solution Approach 2:
The system performs self-service by automatically calculating OPR from pixel values and determining appropriate target luminance without external intervention. This autonomous tone mapping approach ensures accurate reflection of content creator's intention while maintaining processing efficiency.
3Ease of manufacture
If display set luminance is used directly, then the implementation is straightforward, but brightness distortion occurs due to physical characteristics
Solution Approach 1:
The patent introduces target luminance as an intermediary parameter between display set luminance and actual image output. This intermediary accounts for physical characteristics and usage environment, enabling straightforward implementation while achieving brightness accuracy through the mediating calculation.
Solution Approach 2:
The system changes the luminance parameter from fixed display set luminance to dynamic target luminance based on OPR. This parameter transformation maintains implementation simplicity while correcting brightness distortion by adapting to actual display conditions and content characteristics.
Data Source
AI summary
Provided is an electronic device for, and method of, displaying an image, the electronic device including: a display; at least one processor; and memory storing one or more instructions that, when individually or collectively executed by the at least one processor, may cause the electronic device to: obtain an on-pixel ratio (OPR) based on input image data, determine a target luminance based on the OPR and a display set luminance, perform HDR tone mapping, using the target luminance, on the input image data, and control the display to display an image corresponding to the input image data on which HDR tone mapping is performed.