Preview Image Sunlight Readability via Gamma Lookup Table
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Solution Overview
Problem
Mobile devices struggle to display preview images clearly under sunlight conditions due to light reflection, with existing solutions increasing power consumption and hardware costs.
Innovation Solution
An image display method that processes preview images using an image signal processing unit to generate pixel luminance values and selects an appropriate gamma lookup table based on ambient light illumination, adjusting pixel luminance values for improved readability without additional hardware.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If additional hardware (image processing hardware and ambient light sensor) is used to dynamically adjust backlight and digital contrast for improving sunlight readability, then the sunlight readability of the screen is improved, but the device complexity and cost increase
Solution Approach 1:
The existing processor and graphics processing module (GPU) are made to perform dual functions: their original processing tasks and the additional task of computational graphical analyzing for sunlight readability enhancement. This eliminates the need for dedicated image processing hardware by utilizing the multi-functionality of existing components.
Solution Approach 2:
Instead of using additional physical hardware, the patent creates a virtual copy of image processing functionality through computational algorithms running on the existing processor and GPU. This virtual implementation achieves the same effect as dedicated hardware without the associated cost and complexity.
2Device complexity
If computational and graphical analyzing abilities of existing processor and GPU are used to replace additional hardware cost, then the hardware cost is reduced, but the power consumption increases and battery life is reduced
Solution Approach 1:
The system performs preliminary analysis of the ambient light conditions and preview image characteristics before full image processing. By pre-evaluating whether sunlight readability enhancement is needed and selecting appropriate processing parameters in advance, the system avoids unnecessary computational work and reduces overall power consumption.
Solution Approach 2:
The patent applies partial processing by selectively enhancing only the portions of the image that require sunlight readability improvement, rather than processing the entire image at full complexity. This selective approach reduces computational load and power consumption while maintaining effectiveness.
3Productivity
If the preview image is displayed under strong sunlight without adjustment, then the system usage is minimal, but the preview image cannot be clearly viewed due to light reflection
Solution Approach 1:
The patent introduces an intermediary computational processing layer between the image capture and display. This intermediary layer analyzes ambient light conditions and applies appropriate gamma lookup tables and luminance adjustments to counteract the harmful effect of light reflection, enabling clear preview visibility without adding significant system overhead.
Data Source
AI summary
An image display method, adapted to an electronic device having a screen, an image capturing unit, and a light sensor, includes the following steps. A preview image captured by the image capturing unit is received and processed so as to generate a plurality of pixel luminance values of the preview image. A light illumination of an ambient light detected by the light sensor is received. An output Gamma lookup table among a plurality of Gamma lookup table is selected according to the pixel luminance values and the light illumination of the ambient light. An adjusted pixel luminance value corresponding to each of the pixel luminance values is generated based on the output Gamma lookup table so as to accordingly display the preview image on the screen with sunlight readability. An electronic device is further provided in the invention to implement the above method.