Projection Apparatus Hand Detection with Dynamic Sensing Control
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Solution Overview
Problem
Existing projection systems require operators to physically interact with keyboards or mice to perform page-related operations during presentations, which can be inconvenient and prone to errors due to accidental changes in projection conditions such as zoom, shift, or trapezoidal distortion.
Innovation Solution
A projection apparatus equipped with a camera and control unit that projects markers on the screen, allowing operators to provide page-up or page-down instructions by placing their hands over designated areas, with the system calibrating and adjusting to maintain accurate detection even when projection conditions change.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If hand placement detection is used for page operations, then ease of operation is improved, but reliability deteriorates when projection conditions change
Solution Approach 1:
The control unit continuously monitors projection conditions (zoom, shift, trapezoidal distortion) and uses this feedback to determine when to stop sensing. When projection conditions change, the system stops hand placement detection to prevent erroneous operations, and can resume when conditions stabilize, ensuring reliable operation throughout the presentation.
Solution Approach 2:
The sensing state is made dynamic rather than static. The control unit adjusts the sensing state based on real-time projection conditions, transitioning between sensing and non-sensing states. This dynamic adaptation allows the system to maintain high reliability by stopping sensing when projection conditions change while preserving ease of operation when conditions are stable.
2Speed
If continuous sensing is performed, then responsiveness is improved, but error rate increases when projection conditions change
Solution Approach 1:
The control unit uses feedback from projection condition monitoring to dynamically control the sensing state. When projection conditions are stable, sensing is active for rapid response. When changes are detected, sensing is stopped to prevent errors. This feedback mechanism balances responsiveness and error prevention based on real-time conditions.
Solution Approach 2:
The sensing state parameter is changed based on projection condition parameters. The control unit monitors parameters such as zoom level, shift amount, and trapezoidal distortion, and adjusts the sensing state accordingly. When these parameters indicate stable projection conditions, sensing is enabled; when they indicate changes, sensing is disabled, thus controlling the error rate while maintaining responsiveness.
3Productivity
If hand placement detection is enabled, then productivity is improved, but measurement precision deteriorates when projection conditions change
Solution Approach 1:
The detection system operates dynamically, switching between active and inactive states based on projection condition stability. During stable projection conditions, the system maintains high measurement precision for accurate hand placement detection. When projection conditions change, the system pauses detection to avoid imprecise measurements, thus preserving overall measurement precision while maintaining high productivity during stable periods.
Solution Approach 2:
The control unit continuously monitors projection condition feedback and adjusts detection activity accordingly. When feedback indicates stable conditions, precise hand placement detection is performed to maintain productivity. When feedback indicates projection condition changes, detection is suspended to prevent measurement errors, thus preserving measurement precision while maximizing productivity during stable periods.
Data Source
AI summary
One or more projection apparatuses, control methods for one or more projection apparatuses, and storage mediums for use therewith are provided herein. At least one projection apparatus includes: a projection unit including an optical unit, the projection unit being configured to project a projection image including a predetermined display item onto a projection surface; a sensor configured to sense a predetermined area corresponding to the predetermined display item on the projection surface; and a control unit configured to: (i) perform predetermined processing relating to the projection image in response to the sensor detecting a predetermined instruction in the predetermined area, and (ii) stop sensing performed by the sensor in a case where a state of the optical system of the projection unit changes while the projection image including the predetermined display item is being projected.