Distance Sensor Face-Orientation Control for Stable Brightness
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Solution Overview
Problem
Existing face orientation determination methods using distance measuring sensors are unstable near the boundary of their determinable distance range, leading to inconsistent screen brightness control and high power consumption.
Innovation Solution
An information processing apparatus and method that uses a distance measuring sensor to detect a person within a first distance range, determines face orientation within a second closer range, maintains the determination result when the person moves out of this range, and fixes the orientation when the person is not detected, ensuring stable control and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If face orientation is determined using distance measuring sensor at long distance, then measurement precision deteriorates due to errors being buried in distance measurement values, but extending the determinable distance range is desired
Solution Approach 1:
The system performs preliminary face orientation determination when the person is within the reliable distance range (second distance range). The determined orientation is stored and maintained when the person moves to longer distances, avoiding the need for imprecise long-distance measurements while preserving accurate orientation data obtained earlier.
Solution Approach 2:
The system introduces an intermediary mechanism (orientation maintenance function) that bridges the gap between short-distance accurate measurement and long-distance operation. Instead of directly measuring orientation at long distances with poor precision, the system uses the previously determined orientation as an intermediary value to control the display device.
2Device complexity
If face orientation determination is fixed by assuming forward facing when exceeding determinable distance range, then device complexity is reduced, but control stability deteriorates near the boundary of determinable distance range
Solution Approach 1:
The system dynamically adjusts the face orientation determination strategy based on the person's distance. Within the second distance range, active determination is performed. When moving beyond this range, the system transitions to maintaining the last determined orientation. This dynamic adaptation ensures stability near the boundary while managing complexity.
Solution Approach 2:
The system continuously monitors the person's distance and uses this feedback to determine whether to perform active face orientation determination or to maintain the stored orientation. This feedback mechanism prevents unstable transitions at the boundary by smoothly switching between determination modes based on real-time distance information.
3Adaptability or versatility
If screen brightness is controlled based on unstable face orientation determination near boundary distance range, then adaptability to user position is improved, but power consumption increases due to frequent brightness adjustments
Solution Approach 1:
The system performs preliminary face orientation determination within the reliable distance range and maintains this determination when the person moves to longer distances. This preliminary action ensures that screen brightness control is based on accurate orientation data, reducing unnecessary brightness adjustments and lowering power consumption while maintaining adaptability.
Solution Approach 2:
The system uses feedback from distance measurement to control screen brightness adjustments. By monitoring whether the person remains within the second distance range, the system intelligently determines when to update brightness based on orientation changes, avoiding frequent unnecessary adjustments and reducing power consumption while maintaining user experience.
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
Stabilizes face orientation determination and screen brightness control, reducing power consumption by maintaining accurate orientation determination and adjusting screen brightness accordingly.
Implementation Method 1
a distance measuring sensor (distance measurement sensor) for detecting a distance using infrared light
Data Source
AI summary
An information processing apparatus includes: a distance measuring sensor which measures a distance to an object; a memory which temporarily stores distance information indicative of the distance measured by the distance measuring sensor; and a processor which executes processing based on the distance information. The processor performs person detection processing to detect a person present within a first distance range using the distance measuring sensor, and face direction determination processing to determine a face orientation of the person when the person is detected within the first distance range by the person detection processing. In the face direction determination processing, when the person detected by the person detection processing is within a second distance range closer than the first distance range, the processor determines a face orientation of the person using the distance measuring sensor.