Infrared Reference Point Modulation for Cursor Control
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Solution Overview
Problem
Conventional cursor control methods for image displays are prone to inaccuracy due to interference from ambient light, particularly halogen lamps and sunlight, which complicates image recognition and precise control of image displays.
Innovation Solution
A control device and method that modulates the light of reference points with a predetermined spectrum, allowing a remote controller to capture and demodulate the light, thereby eliminating ambient light interference and improving control accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ambient light filtering is not applied, then the control device can detect all light sources, but the control precision deteriorates due to interference from halogen lamps and sunlight
Solution Approach 1:
The patent converts the harmful ambient light into a beneficial signal by using the same spectral range (infrared) for both the reference point light source and the detection. The modulation technique further transforms the continuous harmful ambient light into a distinguishable periodic signal that can be easily filtered and identified by the control device, turning the interference into a useful detection mechanism.
Solution Approach 2:
The patent changes the temporal parameter of the reference point light source by modulating its intensity at a specific frequency. This parameter change allows the control device to distinguish the modulated reference point signal from unmodulated or differently modulated ambient light sources, thereby improving control precision while filtering out harmful ambient light interference.
2Loss of information
If the image sensor captures all objects in the field of view, then complete scene information is obtained, but the image recognition process becomes more complicated
Solution Approach 1:
The patent extracts only the essential information needed for control by using an infrared pass filter to isolate the reference point light source from other objects in the scene. This extraction approach captures the critical infrared signal while filtering out unnecessary visual information, thereby simplifying the image recognition process while maintaining sufficient scene information for accurate control.
Solution Approach 2:
The patent introduces an infrared pass filter as an intermediary between the image sensor and the various light sources in the scene. This intermediary selectively transmits infrared wavelengths while blocking other wavelengths, thereby simplifying the image recognition process by pre-filtering the scene information before it reaches the sensor, without losing the essential control-relevant data.
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
The solution enhances the precision of image display control by isolating the reference points' light from ambient light, resulting in more accurate cursor control and function state adjustments on various image displays.
Implementation Method 1
The modulation unit modulates the light of a predetermined spectrum generated by the reference points with a brightness variation cycle
Implementation Method 2
arrange an infrared pass filter on an image sensor to remove the light out of the infrared spectrum
Implementation Method 3
The image sensor is immune to the influence of the light generated by the fluorescent lamp (wavelength 350-750 nm) commonly used for indoor illumination
Implementation Method 4
an image sensor to receive the modulated light signal from the reference points
Data Source
AI summary
A control device for an image display includes at least two reference points, a modulation unit and a remote controller. The modulation unit modulates the light of a predetermined spectrum generated by the reference points with a brightness variation cycle. The modulation unit controls the reference points to emit the light with a first brightness within a first period of the brightness variation cycle and to emit the light with a second brightness within a second period of the brightness variation cycle, wherein the first brightness and the second brightness are not zero gray level. The remote controller captures the light of the predetermined spectrum with a sampling cycle and demodulates an image variation of the reference points with respect to the remote controller. The present invention further provides a control method for an image display.