Hand Image Detection for Intuitive Non-Contact Operation Input
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Solution Overview
Problem
Existing non-contact operation input devices face challenges such as cumbersome cursor tracking, operator intuition mismatch, and inoperative regions due to camera positioning changes, especially when using single cameras for hand motion detection.
Innovation Solution
An operation input device comprising a camera, hand/finger image detector, operation region specifier, region map maker, and operation input signal creator, which maps the effective operation region on a display based on hand/finger image detection and converts coordinates for intuitive operation input, regardless of operator position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple detection targets are tracked to improve operation accuracy, then operation precision is improved, but device complexity and operation burden increase
Solution Approach 1:
The patent extracts and eliminates the need for multi-target tracking by focusing solely on hand/finger image detection. Instead of tracking multiple detection targets (as in prior art), the system selectively detects only the hand or finger images within the operation region, thereby maintaining operation accuracy while significantly reducing system complexity and operational burden.
2Measurement precision
If camera field of view is fixed to maintain detection accuracy, then measurement precision is improved, but adaptability to operator position changes deteriorates
Solution Approach 1:
The patent implements dynamic adaptation by automatically adjusting the operation region based on detected hand/finger image positions. When the operator changes position, the system dynamically recalculates and repositions the operation region within the camera field of view, ensuring that hand motion detection remains accurate regardless of operator location. This dynamic adjustment resolves the contradiction between fixed field of view requirements and operator position flexibility.
3Adaptability or versatility
If operation region is expanded to accommodate operator movement, then adaptability is improved, but measurement precision deteriorates due to distance measurement limitations
Solution Approach 1:
The patent applies local quality by creating a dedicated operation region with optimized detection parameters rather than uniformly expanding the entire field of view. Within this localized operation region, the system maintains high measurement precision by concentrating detection resources and using position-specific calibration, while still accommodating operator movement through dynamic repositioning of this localized region.
Data Source
AI summary
A hand/finger image detector (112) detects a hand/finger image presenting a hand or finger of an operator from a frame image captured by a camera. An operation region specifier (113) specifies an operation region from a field of view of the camera based on the position or size of the hand/finger image in the entire frame image A region map maker (114) maps the specified operation region on a display region. Then, an operation input signal creator (115) detects change in the position, size, or shape of the hand/finger image in the mapped operation region, and creates and outputs an operation input signal based on the change.