Projector White Peaking Control for Noise Suppression
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Solution Overview
Problem
Existing projector technologies, such as DLP projectors, face image quality deterioration when super-resolution processing is combined with white peaking processing, leading to amplified noise and unnatural gradation representation.
Innovation Solution
A projector system that includes an input unit, a projection unit, an image processing unit for sharpening, and a projection control unit, where the sharpening parameter and luminance image projection time are associated to control the white peaking processing, thereby balancing high-frequency emphasis and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If super-resolution processing is applied to enhance image resolution, then the resolution of the projected image is improved, but the noise component in the image is emphasized
Solution Approach 1:
The patent applies sharpening processing with adjustable sharpening parameters to enhance high-frequency components of the image signal. By controlling the strength of the sharpening effect through parameter adjustment, the system can improve image resolution while managing the emphasis of noise components, thus resolving the contradiction between resolution enhancement and noise suppression
2Illumination intensity
If white peaking processing is applied to increase luminance image projection time, then the luminance of the projected image is enhanced, but the noise component is further amplified and gradation representation becomes unnatural
Solution Approach 1:
The patent dynamically adjusts the luminance image projection time (white peaking level) based on the sharpening parameter value. When sharpening is applied with higher strength, the system reduces the white peaking level to prevent excessive noise amplification. This dynamic coordination between sharpening intensity and white peaking level maintains natural gradation representation while still enhancing luminance when appropriate
3Illumination intensity
If both super-resolution processing and white peaking processing are applied together, then the resolution and luminance are improved, but the noise component is further emphasized and image quality deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the projection control unit monitors the sharpening parameter value and automatically adjusts the white peaking level accordingly. This closed-loop control ensures that when sharpening processing is applied to improve resolution, the white peaking level is reduced to compensate for potential noise amplification, thus maintaining overall image quality while achieving both resolution and luminance improvement
Data Source
AI summary
A projector includes an input unit which inputs an image signal, a projection unit which projects an achromatic luminance image and a chromatic image on the basis of the image signal input by the input unit, an image processing unit which performs a sharpening processing to emphasize a high-frequency component in the image signal in accordance with a sharpening parameter to the image signal input by the input unit, and a projection control unit which controls a luminance image projection time of the luminance image for the chromatic image projected in the projection unit, a value of the sharpening parameter and the luminance image projection time being associated with each other.