Adjustable AF Assist Light Control for Self-Portrait Mode
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Solution Overview
Problem
When taking self-portraits at close range, the emission of AF assist light can dazzle the user and hinder focus detection, while reducing light emission may compromise focusing accuracy.
Innovation Solution
A light-emission control apparatus that adjusts the amount of AF assist light emission in self-portrait mode to a smaller amount than in other modes, ensuring comfort for the user without compromising focus detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If AF assist light is emitted at normal intensity for focus detection, then focus detection accuracy is improved, but user comfort deteriorates due to dazzle in self-portrait mode
Solution Approach 1:
The patent applies dynamics by making the AF assist light emission intensity adjustable based on shooting mode. The control unit dynamically changes the light emission amount from a first value (higher intensity) in non-self-portrait modes to a second value (lower intensity) in self-portrait mode, allowing the system to adapt to different operational contexts and resolve the contradiction between focus detection accuracy and user comfort
Solution Approach 2:
The patent implements parameter changes by modifying the emission intensity parameter of the AF assist light based on the detected shooting mode. When self-portrait mode is detected, the control unit changes the light emission parameter from the first value to the second value, thereby adjusting the physical parameter of light intensity to prevent user dazzle while maintaining adequate focus detection capability
2Object-affected harmful factors
If AF assist light emission is reduced in self-portrait mode to prevent dazzle, then user comfort is improved, but focus detection accuracy may deteriorate
Solution Approach 1:
The patent applies parameter changes by selectively adjusting the AF assist light emission intensity based on shooting mode detection. The control unit changes the emission parameter from the first value to the second value only when self-portrait mode is detected, maintaining higher intensity for other modes where it does not cause dazzle, thus preserving focus detection accuracy where needed while reducing it only when necessary for user comfort
Data Source
AI summary
A light-emission control apparatus includes a shooting-mode selecting unit, a focus detecting unit, a light emitting unit, and a control unit. The shooting-mode selecting unit is configured to be capable of selecting at least a first shooting mode in which a predetermined correction is applied to a human face of a captured image or a second shooting mode different from the first shooting mode. The focus detecting unit is configured to detect a focus. The light emitting unit is configured to emit assist light toward a subject while the focus detecting unit is detecting the focus. The control unit is configured to control an amount of emission of the assist light in the first shooting mode to a smaller amount than an amount of emission of the assist light in the second shooting mode.