Display Device Marker-Based Coordinate Correction
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Solution Overview
Problem
Existing display devices struggle to accurately detect and output the location of a pointed location on a displayed image, especially when the image has unknown or incorrectly determined resolution, leading to inaccuracies in coordinate conversion and display alignment.
Innovation Solution
A display device with a pointed location detection unit, coordinate calculation unit, coordinate conversion unit, output unit, and location correction unit that uses image location information and a correction image with markers to accurately convert and output coordinates, regardless of the image's resolution, by detecting markers within the displayable area and correcting image location information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If resolution information is determined by measuring frequency of synchronizing signals, then resolution can be obtained for standard images, but accurate resolution information cannot be obtained for images with unknown or unsupported resolution
Solution Approach 1:
The patent introduces a correction image with markers as an intermediary to bridge the gap between the displayed image and the pointed location detection. Instead of directly measuring resolution from the input image (which fails for unknown resolutions), the system displays a correction image with known marker positions and uses these markers to establish a reliable coordinate transformation relationship, enabling accurate pointer location conversion regardless of the original image's resolution.
Solution Approach 2:
The system performs preliminary action by displaying the correction image with markers before performing pointer location detection. This preliminary display establishes a known reference framework (the markers with predetermined positions) that will be used to accurately determine the relationship between the displayed content and the physical display surface, enabling subsequent accurate coordinate conversion even when the input image resolution is unknown.
2Measurement precision
If calibration is performed at each display condition change, then accurate pointer location detection can be maintained, but lots of effort and time are required
Solution Approach 1:
The system implements self-service by automatically displaying the correction image with markers and automatically detecting the marker positions to obtain transformation parameters. This eliminates the need for manual calibration operations, allowing the system to autonomously maintain accurate pointer location detection across different display conditions without requiring user intervention or time-consuming manual adjustment.
Solution Approach 2:
The patent employs feedback by using the detected marker positions in the correction image to automatically calculate and update the transformation parameters between the displayed coordinate system and the physical display surface coordinates. This feedback loop enables the system to automatically adapt to different display conditions and maintain accurate pointer location detection without manual recalibration.
3Productivity
If image location information is used for coordinate conversion, then coordinates can be converted based on display location, but inaccurate resolution information leads to incorrect coordinate conversion
Solution Approach 1:
The correction image with markers serves as an intermediary reference that decouples the coordinate conversion process from the potentially inaccurate resolution information of the input image. By using the markers with known predetermined positions, the system establishes a reliable transformation relationship that accurately maps between the displayed image coordinates and the physical display surface coordinates, ensuring high-precision coordinate conversion regardless of input image resolution accuracy.
Data Source
AI summary
A projector displays an image supplied by a PC on a screen using a projection unit, detects a pointed location on the screen using a location detection unit, calculates first coordinates as coordinates of the pointed location in a displayable area of the screen using a coordinate calculation part, converts the calculated first coordinates into second coordinates as coordinates in the supply image using a coordinate conversion part based on image location information indicating a location of the supply image on the screen, outputs the second coordinates obtained by the conversion from an output unit, and corrects the image location information by processing of displaying the image based on a correction image using a control unit.