Projection Image Correction Using Built-In Camera Feedback
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Solution Overview
Problem
Existing projectors struggle to accurately reproduce colors on non-dedicated projection surfaces due to the need for fixed digital camera setups, which increase setup time and labor, and are prone to camera shake, making it difficult to detect the projection range correctly.
Innovation Solution
A projection control apparatus that uses a digital camera connected via USB to a projector, projecting and photographing multiple test pattern images to calculate correction information for shape and color, allowing for easy initial setup on irregular surfaces without external fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a digital camera is fixed by a tripod to photograph projection images, then measurement precision is improved, but device complexity and setup time increase
Solution Approach 1:
The system uses the projector's own built-in camera to capture images of the projection surface, eliminating the need for external cameras and tripods. The projector performs both projection and image capture functions, making the system self-sufficient and reducing external equipment requirements.
Solution Approach 2:
The projector is designed to perform multiple functions: it projects images and simultaneously captures images of the projection surface using its built-in camera. This multi-functionality eliminates the need for separate camera equipment and simplifies the overall system configuration.
2Ease of operation
If multiple projection images are photographed successively with a handheld digital camera, then ease of operation is improved, but measurement precision deteriorates due to camera shake
Solution Approach 1:
The projector captures images of its own projection surface using its built-in camera, eliminating the need for external cameras that require manual handling. This self-capture mechanism ensures stable, shake-free imaging while maintaining ease of operation.
Solution Approach 2:
The system replaces the mechanical handheld camera operation with an automated electronic image capture mechanism. The projector's built-in camera automatically captures images of the projection surface, eliminating mechanical instability from manual camera handling.
3Measurement precision
If a color sensor is used to acquire color information, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The projector's built-in camera serves dual purposes: capturing the projection surface geometry and acquiring color information. This multi-functional use of the camera eliminates the need for separate color sensors while maintaining measurement precision.
Solution Approach 2:
The system merges the functions of geometric measurement and color sensing into a single image capture process. The built-in camera simultaneously captures both the shape/position of the projection surface and its color characteristics, eliminating the need for separate sensing devices.
4Adaptability or versatility
If initial setting is performed on non-dedicated projection surfaces, then adaptability is improved, but manufacturing precision deteriorates due to surface irregularities
Solution Approach 1:
The system dynamically adjusts projection parameters based on the captured image data of the projection surface. By detecting the surface shape, position, and color characteristics, the projector modifies projection parameters to compensate for surface irregularities, maintaining image reproduction accuracy on various surfaces.
Solution Approach 2:
The system uses feedback from the built-in camera to detect the projection surface characteristics and automatically adjusts projection parameters. The captured images provide feedback information about surface irregularities, enabling real-time compensation and maintaining high image quality on non-dedicated surfaces.
Data Source
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AI summary
A projection control apparatus (10) includes means (20) for successively projecting a plurality of images for correction onto a projection target (CT), each of the images for correction being configured such that a marker image (CM, DM) is arranged at a preset position in the image, means (DC, 20) for acquiring information of a plurality of photographed images including the images for correction, means (20) for detecting a difference between the respective photographed images, based on positions of the marker images, and means (20) for setting a correction condition for projecting an image, based on the information of the photographed images, in accordance with the detected difference of a projection image range.