Unified Image Corrector for Mobile Terminal Luminance Consistency
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Solution Overview
Problem
Mobile terminals with cameras face issues in maintaining consistent luminance and white balance between camera mode and normal mode, leading to degraded image quality and redundant tuning efforts due to duplicated image correction functions.
Innovation Solution
Incorporating a comparator to receive and compare image signals with reference signals, generating deviation signals for an image corrector to adjust and correct image signals, ensuring consistent luminance and white balance across modes, and streamlining image correction processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If image correction is performed separately in camera mode and normal mode, then image quality can be optimized for each mode, but the device complexity and tuning effort increase due to duplicated correction functions
Solution Approach 1:
The patent merges the image correction function into a single unified module that processes both camera mode images and normal mode display images. Instead of having separate correction circuits for each mode, one correction module handles both types of images by receiving the original image signal and applying appropriate correction based on the mode, thereby reducing device complexity while maintaining image quality optimization for both modes
Solution Approach 2:
The image correction module is designed with multi-functionality to handle different image types. It can process camera captured images and normal mode display images through the same correction circuitry, adapting its operation based on the input signal type. This universal approach eliminates the need for separate dedicated correction modules for each mode, reducing overall device complexity
2Manufacturing precision
If separate image correction modules are used for camera mode and normal mode, then each mode can be independently optimized, but the tuning time and effort increase significantly
Solution Approach 1:
By combining the image correction function into a single module that handles both camera mode and normal mode images, the patent reduces the number of independent tuning processes required. The unified module can be tuned once to handle both modes, significantly reducing the cumulative tuning time and effort compared to separately tuning dedicated correction modules for each mode
3Manufacturing precision
If luminance and white balance correction are applied in camera mode, then image quality improves, but the luminance and white balance become inconsistent with normal mode display
Solution Approach 1:
The patent implements a feedback mechanism where the correction module receives information about the desired luminance and white balance characteristics and adjusts its correction applied to camera mode images accordingly. This feedback control ensures that the corrected camera images maintain consistency with normal mode display characteristics while still applying necessary quality improvements
Solution Approach 2:
The correction module dynamically adjusts correction parameters based on the input image type and desired output characteristics. By changing parameters such as luminance offset, white balance coefficients, and contrast enhancement levels according to the mode and reference standards, the module maintains consistency across different modes while optimizing image quality
Data Source
AI summary
A mobile terminal has an image corrector which includes a comparator for receiving a first image signal photographed by a camera in a camera mode and a second image signal displayed in a normal mode, and for comparing them with a reference signal to generate a deviation signal, and a corrector for receiving the deviation signal from the comparator, and for supplying the first or second image signal, in which white balancing and gamma are corrected, in response to the deviation signal so that luminance and white balance of the first image signal displayed in the camera mode become equal to or similar to luminance and white balance of the second image signal displayed in the normal mode.