Proportionally Corrected Image Projection via Depth Scan
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Solution Overview
Problem
Conventional projectors struggle with keystone correction on non-flat surfaces, often compromising image quality by either manual adjustments that cannot eliminate horizontal keystoning or digital corrections that result in a squared image at an angle.
Innovation Solution
A projection device equipped with a camera and sensors that performs depth scans to generate a 3D model of the surface, allowing for real-time image corrections such as scaling, rotating, and skewing to ensure proportional and accurate image projection on dynamic or non-flat surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manual keystone correction is applied by adjusting the lens, then the projection angle can be corrected, but horizontal keystoning cannot be eliminated and image quality deteriorates
Solution Approach 1:
The patent replaces manual mechanical lens adjustment with an automated digital image processing system. The processor receives the original image, applies digital keystone correction algorithms to generate a corrected image, and sends this to the projector. This substitution eliminates the limitations of manual mechanical correction by providing automated, precise control over image geometry without physical lens manipulation.
Solution Approach 2:
The system dynamically changes image parameters including aspect ratio, scaling factors, and geometric transformation matrices based on detected projection surface characteristics. The processor calculates correction parameters from depth scan data and applies them to transform the image, enabling precise control over projection geometry without physical adjustment.
2Manufacturing precision
If digital keystone correction is applied by scaling or altering the image, then the projection can be corrected, but the image becomes squared even at angles
Solution Approach 1:
The system performs preliminary depth scanning of the projection surface before image projection to capture geometric information about the surface shape and orientation. This preliminary measurement allows the processor to pre-calculate the exact geometric transformation needed, ensuring that when the image is corrected, the original proportional relationships are preserved rather than distorted into a squared shape.
Solution Approach 2:
The system uses depth scan data as feedback to continuously monitor and adjust the projection. The camera captures the actual projection surface geometry, the processor compares this with the intended projection, and automatically adjusts the image transformation parameters to maintain proper proportions, creating a closed-loop correction system.
3Area of stationary object
If a projector is used to project a small image onto a larger surface, then the image can be displayed at the intended size, but the projection must be scaled which affects image quality
Solution Approach 1:
The system performs preliminary scaling calculations based on the depth scan data and the relationship between the small source image and the large projection surface. The processor pre-computes the exact scaling factors and geometric transformations needed, allowing the image to be scaled up while maintaining resolution quality through precise digital control rather than lossy analog scaling.
Data Source
AI summary
Technologies for projecting a proportionally corrected image include a projection device. The projection device includes a camera capable of performing a depth scan and a projector capable of projecting an image onto a projection region of a projection surface. The projection device is configured to determine one or more image corrections as a function of the model of the projection region, transform the image based on the image corrections to generate an updated image, and project, by the projector, the updated image to the projection region. The projection device is further configured to monitor the projection region to detect an adjustment event, (i.e., a detected change of the projection region relative to the projection device) and generate, in response to detecting the adjustment event, another updated image based on the detected change of the projection region. Other embodiments are described and claimed.