Projector Luminance Adjustment for Dynamic Range
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Solution Overview
Problem
When using multiple projector devices to enhance image size or luminance, there is a challenge in maintaining or increasing the contrast ratio and dynamic range while avoiding excessive luminance increase, which can lead to decreased image quality.
Innovation Solution
An image output device that communicates with other devices to adjust the luminance of specific areas within an input image based on brightness information and tone map curves, allowing for the expansion of the dynamic range and contrast ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple projector devices are used to increase image size or maximum output luminance, then the maximum output luminance is improved, but the contrast ratio and dynamic range deteriorate due to excessive luminance increase
Solution Approach 1:
The patent applies local quality by adjusting luminance differently across various areas of the image based on brightness information and tone map curves. Instead of uniformly increasing luminance across the entire image, the system selectively adjusts luminance in specific regions (e.g., bright areas vs. dark areas) to maintain contrast ratio and dynamic range while still achieving increased maximum output luminance through the overlay of multiple projector devices.
2Illumination intensity
If multiple projector devices output images in overlay manner to increase luminance and three-dimensionality, then the maximum output luminance and three-dimensionality are improved, but the contrast ratio deteriorates
Solution Approach 1:
The patent applies parameter changes by using tone map curves to transform brightness information into adjusted luminance values. The system changes the luminance parameter selectively based on the tone map curve, which defines how different brightness levels should be mapped. This allows the system to maintain contrast ratio while achieving increased maximum output luminance through the overlay of multiple projector devices.
3Illumination intensity
If the luminance of all areas in the input image is increased to maximize output luminance, then the maximum output luminance is improved, but the dynamic range deteriorates
Solution Approach 1:
The patent applies local quality by adjusting luminance differently across various areas of the image based on brightness information and tone map curves. Instead of uniformly increasing luminance across the entire image, the system selectively adjusts luminance in specific regions (e.g., bright areas vs. dark areas) to maintain contrast ratio and dynamic range while still achieving increased maximum output luminance through the overlay of multiple projector devices.
Data Source
AI summary
Disclosed is an image output device including a projector and a communication interface including a circuit. The image output device acquires brightness information of an input image received via the communication interface, identifies whether another image output device outputs the input image by adjusting its luminance, by communicating with the other image output device that receives a same image as the input image and outputs the same image onto a projection surface, adjusts the luminance of at least one area included in the input image based on the brightness information according to a result of the identifying, and controls the projector to output the adjusted input image onto the projection surface.