Optical Touch System Multi-Touch Separation Method
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Solution Overview
Problem
Optical touch monitors face challenges in accurately recognizing multiple touch points due to overlapping images of fingers at certain angles, leading to incorrect single-touch detection in multi-touch scenarios.
Innovation Solution
A method and system that utilize two optical lenses positioned on the same side of a screen to capture images, calculate specific distances and ratios between touch object images, and separate a single touch object image into two images based on these calculations to improve multi-touch recognition accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical lenses capture images of fingers for touch detection, then touch position detection is achieved, but overlapping images of multiple fingers cause incorrect single-touch detection in multi-touch scenarios
Solution Approach 1:
The patent segments the touch detection process into multiple stages: initial touch object detection, image separation analysis, and final touch point determination. By dividing the captured image into multiple candidate touch object images through separation analysis, the system can accurately identify multiple touch points even when images overlap, resolving the contradiction between detection capability and recognition accuracy.
2Adaptability or versatility
If fingers are positioned close together at certain angles, then multi-touch operation is enabled, but image overlap and shielding cause wrong single-touch determination
Solution Approach 1:
The patent introduces additional analysis dimensions by examining image characteristics from multiple perspectives: image intensity distribution, boundary characteristics, and spatial relationships. By analyzing these additional dimensions, the system can distinguish between single-touch and multi-touch scenarios even when fingers are close together, maintaining both multi-touch capability and position accuracy.
3Device complexity
If a single lens captures images for touch detection, then device simplicity is maintained, but overlapping images cannot be properly separated in multi-touch scenarios
Solution Approach 1:
The patent performs preliminary image separation analysis by evaluating multiple candidate touch object images before final touch point determination. This preliminary action of separating and analyzing candidate images allows the system to reliably detect multi-touch scenarios while maintaining a relatively simple single-lens device configuration.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances the accuracy of multi-touch recognition by correctly identifying and separating overlapping touch points, thereby improving the overall performance of optical touch systems.
Implementation Method 1
analyzing the position of the shadow in the captured image caused by the finger shielding the light
Data Source
AI summary
An optical touch system and a touch object separating method thereof are provided. First, touch object images in a first and a second captured image of a first and a second lens are recognized. When the first captured image includes two touch object images and the second captured image includes a single touch object image, a first distance between a leftmost end and a rightmost end of the two touch object images in the first captured image, a second distance between centers of the two touch object images, and a third distance between a leftmost end and a rightmost end of the single touch object image in the second captured image are calculated. A fourth distance corresponds to the third distance is calculated according to a ratio of the first distance to the second distance and used to separate the single touch object images into two touch object images.