Image Switching Brightness Control for Visual Safety
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Solution Overview
Problem
HDR images can cause high-brightness displays during image switching, posing a risk to visual safety due to nonlinear reproduction methods such as channel switching, random access, or CM insertion, where the received image may be excessively bright.
Innovation Solution
An image processing apparatus that maintains a transition display property with a lower brightness level than normal during image switching, utilizing pixel statistical information to determine the ratio of pixels exceeding a threshold, and adjusts the electro-optic conversion property accordingly, ensuring visual safety by gradually transitioning to normal display settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If nonlinear reproduction is used for image switching (channel switching, random access, CM insertion), then image switching capability is improved, but visual safety is compromised due to excessive brightness
Solution Approach 1:
The system performs preliminary analysis of pixel statistical information (brightness distribution, histogram) before image switching occurs. Based on this pre-analysis, it determines whether the upcoming image requires transition display control, allowing the system to prepare appropriate brightness adjustment measures in advance to prevent visual discomfort during switching
Solution Approach 2:
The patent introduces an intermediary transition display period between the original display state and the new image state. During this transition period, the display brightness is controlled to be lower than the normal brightness level, serving as a buffer that mediates between the high-brightness new image and the viewer's eyes, thereby ensuring visual safety while maintaining image switching capability
2Illumination intensity
If the brightness level is kept at normal level during image switching, then display quality is maintained, but visual safety is threatened by excessive brightness
Solution Approach 1:
The system dynamically adjusts the display brightness level based on the display timing (original display period vs. transition display period) and the characteristics of the image being displayed. During the transition display period, the brightness is dynamically controlled to be lower than normal, while returning to normal brightness during the original display period, thus adapting brightness to different operational states
Solution Approach 2:
The patent changes the brightness parameter (illumination intensity) based on the display period and image characteristics. By modifying the brightness level from normal to reduced during transition periods, and adjusting based on pixel statistical information, the system resolves the contradiction between maintaining display quality and ensuring visual safety
3Object-affected harmful factors
If pixel statistical information is processed to determine transition display period, then visual safety is ensured, but processing load increases
Solution Approach 1:
The system extracts only the necessary pixel statistical information (brightness distribution characteristics, histogram data) from the image data rather than processing the entire image dataset. This selective extraction of critical brightness parameters reduces the processing load while still providing sufficient information to determine whether transition display control is needed and to calculate the appropriate transition period
Data Source
AI summary
Visual safety is ensured when image switching takes place.When an image is switched by nonlinear reproduction, a display property is kept switched, during a transition display period, to a transition display property with a brightness level kept lower than a normal level, on the basis of pixel statistical information regarding the image. For example, an electro-optic conversion property is controlled to a transition property or the brightness level of a backlight is suppressed.