Object Sensing Apparatus Dynamic Light and Camera Calibration
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Solution Overview
Problem
Existing touch interaction technologies face challenges in accurately identifying object touch regions on displays due to issues like low resolution and brightness variations, which affect the ability to determine the position of objects touched or hovered over, especially when using infrared light sources and cameras.
Innovation Solution
The apparatus includes a display with a pattern layer, a light source, and cameras that emit and reflect infrared light, with a controller adjusting the light source's brightness and camera exposure time based on pattern images to optimize calibration and image quality, allowing for precise identification of object touch regions through computer vision methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a light source and camera are used to capture pattern images for object detection, then object touch region detection capability is enabled, but image quality deteriorates due to low resolution and brightness variations
Solution Approach 1:
The controller dynamically adjusts the brightness of the light source and the exposure time of the camera based on the captured pattern image quality. When the pattern image is dim or low-resolution, the controller increases light source brightness and/or extends camera exposure time to improve image quality for accurate object detection
Solution Approach 2:
The system captures a pattern image, evaluates its quality (brightness and resolution), and uses this feedback to automatically adjust light source brightness and camera exposure parameters. This closed-loop control ensures optimal image quality for consistent object touch region detection
2Illumination intensity
If the light source brightness is increased to improve image quality, then pattern image brightness improves, but energy consumption increases
Solution Approach 1:
The light source brightness is made dynamic rather than fixed. The controller adjusts the light source intensity in real-time based on the actual imaging conditions and pattern image quality requirements, consuming more energy only when necessary for low-light conditions
Solution Approach 2:
The system changes the operational parameters of the light source (brightness level) and camera (exposure time) based on detected pattern image quality. This allows the system to achieve adequate illumination with minimal energy consumption by using higher brightness only when the pattern image is dim
3Measurement precision
If camera exposure time is extended to improve image quality, then pattern image resolution improves, but detection speed decreases
Solution Approach 1:
The camera exposure time is dynamically adjusted based on imaging conditions. The controller extends exposure time only when the pattern image is dim or low-resolution, and uses shorter exposure times when conditions are favorable, thus balancing image quality and detection speed
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
This solution enhances the accuracy and reliability of object touch region detection by compensating for image distortions and variations, ensuring high-resolution and appropriate brightness images are captured, thereby improving multi-touch interaction capabilities.
Implementation Method 1
a light source that emits infrared rays (IR) and an IR camera are used. More particularly, the digital pen emits IRs to recognize a pattern of a display, a camera captures an IR internally reflected by an IR emitter
Implementation Method 2
a camera configured to generate a pattern image based on light reflected off of the pattern layer
Data Source
AI summary
At least one example embodiment discloses an apparatus for sensing an object, the apparatus including a display, a light source configured to emit light toward the display, a pattern layer on the display, the pattern layer including a first pattern for identifying a position on the display, a camera configured to generate a pattern image based on light reflected off of the pattern layer, and a controller configured to adjust an operation of at least one of the light source and the camera based on a second pattern displayed in the pattern image.