Variable Threshold Flash Angle Deviation Detection
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Solution Overview
Problem
Existing flash units in shooting techniques with bounce flash often issue unnecessary warnings for slight deviations in flash direction, leading to user inconvenience and degradation in image quality due to inaccurate angle requirements.
Innovation Solution
An illumination apparatus with a rotatable light-emitter and a processor-based system that detects the angle of the light-emitter relative to a second body, determining angular deviation based on a variable threshold value specific to the target angle, thereby preventing unnecessary warnings and ensuring accurate flash direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed threshold value is used to determine angular deviation, then the determination is simple and quick, but false warnings are frequently issued in bounce flash scenarios, degrading user convenience
Solution Approach 1:
The patent applies dynamics by making the threshold value variable rather than fixed. The threshold is dynamically adjusted based on the target angle, allowing the system to adapt to different shooting scenarios. In bounce flash mode, when the target angle is directed toward the ceiling, a larger threshold is used to prevent false warnings, while in direct flash mode, a smaller threshold maintains precision.
Solution Approach 2:
The patent changes the parameter of threshold value from a constant to a variable that depends on the target angle. This parameter change allows the system to differentiate between bounce flash and direct flash scenarios, adjusting the sensitivity of angular deviation detection accordingly to reduce false warnings while maintaining accuracy when needed.
2Manufacturing precision
If a small threshold value is used for angular deviation determination, then precise control is achieved for direct flash, but unnecessary warnings are issued for bounce flash where slight deviations are acceptable
Solution Approach 1:
The patent changes the threshold parameter based on the shooting mode and target angle. For direct flash, a small threshold ensures precise control, while for bounce flash with ceiling as target, a larger threshold prevents unnecessary warnings. This parameter adaptation simplifies the warning system by reducing false positives without compromising precision when required.
Solution Approach 2:
The patent applies local quality by having different threshold values for different shooting scenarios. Instead of a uniform threshold, the system uses context-appropriate thresholds: strict for direct flash, lenient for bounce flash. This localized approach to quality control optimizes performance for each specific use case.
3Reliability
If the light-emitting unit is constrained to a predetermined angle, then accurate radiation is achieved, but the system cannot adapt to different shooting environments where flexibility is needed
Solution Approach 1:
The patent makes the flash unit dynamically adjustable rather than fixed at a predetermined angle. The light-emitting unit can be rotated to different angles based on shooting requirements, and the system provides appropriate feedback based on the actual angle achieved versus the target angle, adapting to various shooting environments while maintaining reliability through angular deviation warnings.
Solution Approach 2:
The patent implements a feedback mechanism that monitors the actual angle of the light-emitting unit and compares it with the target angle. Based on this feedback, the system determines whether to issue a warning, allowing the system to adapt to different shooting environments while maintaining reliability through intelligent feedback-based decision making.
Data Source
AI summary
An illumination apparatus which is capable of appropriately determining whether or not a radiating direction of a flash is deviated from a direction targeted by a user and preventing degradation in user convenience. The illumination apparatus has a movable unit that has a light-emitting unit, and a main body unit that holds the movable unit rotatably in a predetermined direction. A present angle of the movable unit with respect to the main body unit is detected, and a difference between the present angle and a target angle to which the movable unit is to be moved is obtained. When the difference is smaller than a threshold value, it is determined that there is no angular deviation of the movable unit. The threshold value used in the determination varies with the target angle.