Projector Keystone Correction External Area Compensation
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Solution Overview
Problem
Existing electronic projectors that perform keystone correction often leave an external area that can cause a sense of heterogeneity for the user, as the remaining area is typically projected in black, which can differ in color and luminance from the external area.
Innovation Solution
An electronic apparatus equipped with a projector, camera, and processor that performs keystone correction and adjusts the pixel values of a second image based on pixel information from both the projection area and the external area, ensuring the difference in color and luminance is minimized.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If keystone correction is performed to improve user convenience and enable flexible projection, then the projection can be adjusted to non-rectangular areas, but an external area is created that causes a sense of heterogeneity due to color and luminance differences
Solution Approach 1:
The patent changes the parameters (color and luminance) of the second image in the remaining area to match the external area. By adjusting these visual parameters, the heterogeneity caused by keystone correction is eliminated, allowing the projector to maintain both flexibility and visual coherence.
Solution Approach 2:
The patent applies homogeneity by making the visual properties of the remaining area match those of the external area. Through pixel value adjustment, the color and luminance are unified across both areas, creating a homogeneous visual appearance that eliminates the sense of heterogeneity while preserving the keystone correction benefits.
2Ease of manufacture
If the remaining area is projected in black to simplify the projection process, then the implementation is straightforward, but the color and luminance differ from the external area causing visual heterogeneity
Solution Approach 1:
Instead of keeping the remaining area as simple black, the patent dynamically changes the color and luminance parameters of the second image to match the external area. This parameter adjustment resolves the visual heterogeneity while maintaining relatively simple implementation through automated pixel value modification.
Solution Approach 2:
The system captures images of the projection area and external area, analyzes the color and luminance differences, and uses this feedback to adjust the pixel values of the second image. This closed-loop feedback mechanism automatically eliminates visual heterogeneity without complex manual configuration.
3Object-affected harmful factors
If pixel values of the second image are adjusted to match the external area to reduce heterogeneity, then visual coherence is improved, but the processing complexity and time increase
Solution Approach 1:
The patent implements a feedback-based automatic adjustment system that captures images, analyzes color and luminance differences, and adjusts pixel values accordingly. This automated feedback loop reduces processing complexity compared to manual methods while effectively eliminating visual heterogeneity.
Solution Approach 2:
The system performs self-service by automatically capturing images, analyzing the visual characteristics of both areas, and adjusting the second image parameters without user intervention. This self-adjusting mechanism reduces the need for complex external processing while maintaining visual coherence.
4Object-affected harmful factors
If continuous image capture and adjustment is performed to maintain visual coherence under changing conditions, then the sense of immersion is enhanced, but the processing time and energy consumption increase
Solution Approach 1:
Instead of continuous adjustment, the patent uses periodic action by capturing images at specified time intervals and adjusting pixel values when changes are detected. This periodic approach maintains visual coherence under changing environmental conditions while reducing unnecessary processing time and energy consumption.
Solution Approach 2:
The system applies partial action by only adjusting pixel values when the difference between areas exceeds a threshold or when environmental changes are detected. This selective adjustment maintains visual coherence when needed while minimizing processing time during stable conditions.
Data Source
AI summary
An electronic apparatus is provided. The electronic apparatus includes: a projector configured to project an image with a specified resolution, a camera, and at least one processor, comprising processing circuitry, connected to the projector and the camera and configured to control the electronic apparatus, wherein at least one processor, individually and/or collectively, is configured to: perform keystone correction for a first image, control the projector to project an image of the specified resolution in which the keystone-corrected first image is included in one area and a second image is included in a remaining area to a projection area, obtain a captured image by photographing the projection area and an external area of the projection area through the camera, adjust a pixel value of the second image based on first pixel information corresponding to the remaining area in the captured image and second pixel information corresponding to the external area of the projection area, and control the projector to project an image of the specified resolution in which the keystone-corrected first image is included in the one area and the second image with the adjusted pixel value is included in the remaining area to the projection area.