Coordinate Conversion for Accurate Pointing in Expanded Display Systems
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Solution Overview
Problem
In image display systems, particularly when operating in expanded screen mode, the pointing element position recognized by the PC deviates from the actual position on the projected image, leading to inaccuracies in operations performed on the projected image.
Innovation Solution
The system includes an image supplier and a display apparatus that communicate bidirectionally, where the display apparatus detects the pointing element position, acquires resolution and positional information, converts coordinates, and transmits corrected coordinates to the image supplier for accurate operation execution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the PC operates in expanded screen mode to display multiple images, then the display area is improved, but the pointing element position recognition accuracy deteriorates
Solution Approach 1:
The patent introduces a coordinate conversion mechanism as an intermediary between the projector coordinate system and the PC expanded screen coordinate system. The converter receives pointing element position information from the projector, converts it to the corresponding PC screen coordinates using stored mapping relationships, and transmits the converted coordinates to the PC. This intermediary process resolves the coordinate system mismatch caused by expanded screen mode, enabling accurate position recognition across the entire expanded display area.
Solution Approach 2:
The patent dynamically changes coordinate system parameters based on the display mode. When expanded screen mode is detected, the system retrieves and applies a specific coordinate conversion formula that maps the projector's native coordinate system to the expanded PC screen coordinate system. This parameter change approach allows the system to adapt to different display configurations while maintaining pointing element position accuracy throughout the entire display area.
2Adaptability or versatility
If the PC operates in expanded screen mode, then the versatility of the display system is improved, but the operational accuracy deteriorates
Solution Approach 1:
The patent implements a dynamic coordinate conversion system that automatically detects the current display mode (standard or expanded screen mode) and switches the coordinate mapping relationship accordingly. The converter maintains multiple coordinate system definitions and dynamically selects the appropriate conversion formula based on the active display mode. This dynamic adaptation ensures that operations performed on the projected image are accurately mapped to the corresponding PC screen location regardless of the display configuration, maintaining operational reliability across different modes.
Solution Approach 2:
The coordinate converter is designed with universal functionality to handle both standard and expanded screen modes through a unified architecture. The system maintains a library of coordinate mapping relationships that can be selected based on the display configuration, allowing the same hardware and software infrastructure to support multiple display modes without compromising operation accuracy. This multi-functional design enables the system to adapt to various display scenarios while ensuring reliable operation execution.
Data Source
AI summary
A method for controlling an image display system includes detecting a position to which a pointing element is pointing on a fourth image, identifying first coordinates in a coordinate system of the fourth image, the first coordinates represent the position in the fourth image, acquiring first information representing resolution of a second image and second information representing a position of a third image relative to the second image on an image supplier, converting the first coordinates into second coordinates in a coordinate system of a first image, which represent a position in the first image, based on the first information and the second information, and transmitting the second coordinates to the image supplier and carrying out a process based on the second coordinates when the image supplier receives the second coordinates from a display apparatus.