Correction Information Calculation for Multi-Projector Alignment
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Solution Overview
Problem
Existing image display systems using multiple projectors face limitations in calculating correction information due to the need for complex identification patterns and robust detection processes, which can be cumbersome and prone to errors, especially when the number of projectors increases.
Innovation Solution
A correction information calculating device that determines correspondence information between identification patterns and projectors by comparing relative positions within a photographed image, allowing for efficient calculation of correction information using a simple method that reduces the necessity for complex pattern shapes and separate projection of characteristic point patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If identification patterns with different identification information are projected from multiple projectors, then correspondence information between projectors and projected areas can be acquired, but the number of projectors is limited to the number of identification patterns prepared and the identification patterns become complicated shapes
Solution Approach 1:
The patent uses a single identification pattern that is copied and projected by multiple projectors simultaneously. Instead of creating different identification patterns for each projector, the same pattern is reused across all projectors, eliminating the need to prepare multiple complex patterns while still enabling identification of each projector's projected area through position information
Solution Approach 2:
The identification pattern serves multiple functions: it identifies the projector, marks the projected area, and provides reference points for correspondence matching. By making the identification pattern universal across all projectors, the system achieves versatility in supporting multiple projectors without increasing pattern complexity
2Adaptability or versatility
If identification patterns with complicated shapes are used to increase the number of projectors, then more projectors can be supported, but the process for detecting the identification pattern becomes complicated and robustness may be degraded
Solution Approach 1:
By copying the same simple identification pattern across multiple projectors rather than creating complex unique patterns, the detection process remains straightforward and robust. The simplicity of the repeated pattern makes it easier to detect reliably while still supporting an unlimited number of projectors through position-based differentiation
3Loss of information
If separate identification patterns are projected for each projector, then correspondence information can be acquired, but the process becomes cumbersome and time-consuming
Solution Approach 1:
The patent merges the identification function into a single pattern that is projected by all projectors simultaneously. This combining of identification operations into one unified process eliminates the need for sequential or separate identification pattern projections, reducing both the complexity and time required to acquire correspondence information
Data Source
AI summary
A correction information calculating device calculates correction information representing correspondence relationship between positions of pixels in an image projected onto projection areas of a projection surface from projectors each including an image forming element and positions of pixels in the image forming element. The correction information calculating device includes a correction information calculating unit that calculates the correction information by associating and comparing positions of a plurality of characteristic points defined in original data of the characteristic point patterns that includes the plurality of the characteristic points and is supplied to the projectors and the positions of the plurality of characteristic points inside the photographed image acquired by photographing the characteristic point patterns projected based on the original data based on a correspondence information representing the correspondence relationship between identification patterns on the projection surface and the projectors projecting the identification patterns.