Peripheral Contrast Reduction for Large Screen Flicker
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Solution Overview
Problem
Large screens cause flickering in the peripheral vision area of the human eye due to the increased Critical Flicker Frequency with retinal eccentricity, leading to discomfort and potential eye strain.
Innovation Solution
A method for processing video images by defining peripheral areas and reducing local contrast in these areas, using a contrast reduction technique that decreases the largest pixel luminance values and increases the smallest pixel luminance values, with the reduction gradient increasing with eccentricity from the image center, thereby compensating for the increase in Critical Flicker Frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If screen size is increased to provide larger display area, then display area is improved, but flicker in peripheral vision area increases
Solution Approach 1:
The patent applies local contrast reduction specifically to peripheral areas of the display while maintaining full contrast in the central viewing area. This spatially differentiated approach allows the display to maintain large size for overall visibility while locally reducing flicker effects in regions that correspond to peripheral vision, where the human visual system is more sensitive to temporal variations.
2Object-affected harmful factors
If contrast is reduced in peripheral areas to reduce flicker, then flicker risk is reduced, but image quality in peripheral areas deteriorates
Solution Approach 1:
The patent dynamically adjusts the contrast parameter in peripheral regions based on calculated flicker risk thresholds. By modifying local contrast parameters only where and when flicker risk exceeds thresholds, the system minimizes image quality degradation while effectively reducing flicker. The contrast adjustment is precisely controlled to maintain acceptable image quality while preventing harmful flicker effects.
Data Source
AI summary
An object of the invention is to avoid or at least limit the aforementioned drawback by a specific processing of video images to display, notably on large size screens. For this purpose, a method for processing at least one image of a video sequence is described. The method includes defining at least two peripheral areas PL, PR in the at least one image, and reducing contrast of pixels in the defined peripheral area(s) having a local contrast RL and/or RD above a local contrast threshold Rth or reducing contrast of pixels in subregions 1, 2, . . . , i, . . . , N of these defined peripheral areas having a local contrast Ri, R′i above a local contrast threshold Ri-th.