Radar Pointing Location Recognition Using Weight Value Space
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Solution Overview
Problem
Existing methods for recognizing a user's pointing location on a screen require either a high-cost camera and complex image processing or a large, expensive screen with a laser pointer, and they often necessitate physical contact with a separate tool or screen.
Innovation Solution
A system using multiple IR-UWB radars arranged around a screen to generate a weight value space, detect a hand area, select an effective radar, and determine the finger position by finding an intersection point in the reception signal, allowing non-contact pointing location recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a video camera and image processing block are used to recognize pointing location, then the pointing location can be recognized, but the cost and device complexity increase significantly
Solution Approach 1:
The patent replaces the optical-mechanical camera system with an electromagnetic wave-based radar system. The radar transmits electromagnetic signals and processes the reflected signals to detect hand position, eliminating the need for complex image processing hardware while achieving accurate pointing location recognition through signal processing algorithms.
Solution Approach 2:
The patent extracts only the essential function of detecting pointing location from the complex camera system. By using radar to directly detect the position of the user's hand or pointer, it removes the unnecessary components of camera imaging, lens focusing, and complex image processing algorithms, keeping only the core detection capability.
2Measurement precision
If a laser pointer and screen are used to recognize pointing location, then the pointing location can be recognized, but the screen size and cost increase
Solution Approach 1:
The patent replaces the optical laser pointer system with an electromagnetic radar detection system. Instead of requiring a physical laser beam and a large screen to display the pointer position, the radar system directly detects the three-dimensional position of the user's hand or pointer in space, eliminating the dependency on large screen area.
3Measurement precision
If physical contact with a separate tool or screen is required, then the pointing location can be recognized, but the ease of operation decreases
Solution Approach 1:
The patent replaces contact-based mechanical interaction with non-contact electromagnetic wave detection. The radar system detects the position of the user's hand or pointer through reflected electromagnetic signals without requiring physical contact with the screen or any separate tool, enabling more natural and hygienic interaction.
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
Enables the recognition of a user's pointing location without physical contact with a separate tool or screen, applicable to large screens, and reduces the need for costly hardware.
Implementation Method 1
a technique for recognizing a pointing location pointed by a user's hand in a display area such as a screen or the like
Implementation Method 2
UWB is a radio technology using a wide-band frequency
Data Source
AI summary
Provided is a method and device for recognizing a pointing location by using a radar. A device according to an embodiment of the present disclosure comprises: a weight value space generation unit for generating a weight value space comprising a plurality of unit spaces in a space in front of the screen, and setting weight values in proportion to intensity of clutter-removed reception signals of the plurality of radars to the unit spaces; a hand area detection unit for adding up the set weight values for each of the unit spaces of the weight value space; an effective radar selection unit for selecting, as an effective radar, a radar having a shortest distance to the detected hand area among the plurality of radars; and a finger position determination unit for detecting a first location (first path) exceeding a predetermined threshold value.