Projection System Automatic Calibration Using Identification Patterns

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional projection systems require manual and time-consuming adjustments to ensure a projected image is fully displayed on a screen, leading to suboptimal display quality due to the image often being larger than the screen and not being aligned properly.

Innovation Solution

A method involving the projection of identification patterns on a display screen, capturing their coordinates, and using this information to calculate the necessary adjustments to align and resize the projection image to match the screen boundaries, allowing for automatic and precise alignment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If manual adjustment operations are performed to align the projection image with the display screen, then the display quality is improved, but the time consumption and operational complexity increase

Engineering Contradiction:

Improvealignment precisionVSAvoidcalibration time

Core Design Contradiction:

Manufacturing precisionVSLoss of time

Solution Approach 1:

The system performs automatic calibration by capturing images of identification patterns projected on the screen, computing transformation matrices, and adjusting the projection image autonomously without requiring manual operation. The projector system calibrates itself using the captured screen boundaries and coordinate transformations.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The system uses identification patterns with distinct colors or grayscale variations that are easily detectable by the image capturing device. These patterns create high-contrast features that facilitate accurate coordinate detection and transformation matrix computation.

Inventive Principle:

Principle #32Color changes

2Manufacturing precision

If manual adjustment operations are performed to align the projection image with the display screen, then the display quality is improved, but the operational complexity increases

Engineering Contradiction:

Improvealignment precisionVSAvoidcalibration operation

Core Design Contradiction:

Manufacturing precisionVSEase of operation

Solution Approach 1:

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The system replaces manual mechanical adjustment operations with an automated image processing and coordinate transformation system. Instead of physically adjusting the projector, the system uses digital image capture, matrix computation, and software-based image transformation to achieve alignment.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Area of stationary object

If the projection image size is increased to cover the display screen, then the screen coverage is improved, but the display quality deteriorates due to peripheral regions being displayed outside the screen

Engineering Contradiction:

Improvescreen coverageVSAvoiddisplay quality

Core Design Contradiction:

Area of stationary objectVSManufacturing precision

Solution Approach 1:

The system computes a transformation matrix that maps the projection image coordinates to the display screen coordinates, enabling precise scaling and positioning. This mathematical transformation allows the projection image to be perfectly sized and positioned to match the screen boundaries, achieving both full coverage and high display quality.

Inventive Principle:

Principle #35Parameter changes

4Productivity

If automatic calibration using identification patterns is implemented, then the calibration speed is improved, but the device complexity increases

Engineering Contradiction:

Improvecalibration speedVSAvoidcalibration system

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The projection system integrates multiple functions into a single calibration process: the identification patterns serve both as alignment references and as measurement tools for computing the transformation matrix. The image capturing device serves dual purposes of displaying patterns and detecting their positions, reducing the need for separate calibration equipment.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentEP3419285B1Projection system and method for calibrating display image

Publication Date: 2024.02.28 CORETRONIC CORPORATION

Figure 1
Figure 2
Figure 3A~3B

AI summary

A projection system and a method for calibrating display image are provided. The method includes: setting a correction image having identification patterns, and establishing first coordinate information of the identification patterns; using a projection device to project the correction image on a display screen; performing an image capturing operation to the correction image and the display screen to obtain a captured image; calculating second coordinate information of the identification patterns in the captured image, and calculating coordinate translation information according to the first coordinate information and the second coordinate information; calculating boundary information of the display screen according to a plurality of boundary coordinate values of the display screen in the captured image and the coordinate translation information, such that the projection device adjusts a size of a projection image for corresponding to the display screen according to the boundary information.