Camera Flash Triggering Using Distance and Ambient Light
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Solution Overview
Problem
Modern personal devices with cameras often use flash modules that are automatically triggered based on ambient light levels, but these flashes provide no perceivable benefit when subjects are far away and can be distracting in dark scenes.
Innovation Solution
A method that identifies a target object within a scene, determines its distance from the camera, and measures ambient light levels to decide whether to trigger the flash, ensuring illumination only when necessary and within an effective range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the flash module is automatically triggered based on ambient light level, then the scene is illuminated during capture, but the flash provides no perceivable benefit when the subject is far away and may be distracting to others
Solution Approach 1:
The system changes the parameter of flash triggering from a single ambient light level threshold to a composite decision based on both ambient light level and distance to subject. By introducing distance as an additional parameter, the flash is only triggered when both conditions are met: ambient light is insufficient AND the subject is within effective flash range, thereby eliminating unnecessary flash usage that causes distraction while maintaining proper illumination when needed
Solution Approach 2:
The system uses feedback from distance measurement (via depth sensor, time-of-flight, or stereo vision) combined with ambient light sensing to dynamically control flash triggering. This feedback mechanism allows the system to adapt flash usage to the actual spatial relationship between camera and subject, ensuring flash is only used when it will effectively illuminate the subject without causing harmful distraction to others in the environment
2Illumination intensity
If the flash is triggered in dark scenes, then the subject is illuminated, but the flash provides no perceivable benefit when the subject is far away
Solution Approach 1:
The system changes the triggering parameters from solely ambient light level to a combination of ambient light level and distance to subject. By requiring both conditions (dark scene AND subject within effective range) to be satisfied, the system ensures flash effectiveness is maintained while avoiding unnecessary flash activation in dark scenes with distant subjects where the flash would not provide perceivable benefit
Solution Approach 2:
The system performs preliminary distance assessment and ambient light measurement before triggering the flash. By evaluating both parameters in advance, the system determines whether flash activation will be effective before actually triggering it, preventing wasted flash usage on distant subjects while ensuring proper illumination when the subject is within range
Data Source
AI summary
A method, system, and computer program product controlling flash behavior of a camera during capture of image data. The method includes identifying a target object from among a plurality of objects in a current scene. The method further includes determining whether a distance to the target object is within an effective flash range associated with at least one flash module of an image capturing device. The method further includes measuring, via at least one camera, an ambient light level within the current scene and comparing the measured ambient light level to a predetermined flash light threshold. The method further includes, in response to determining the target object is within the effective flash range and the measured ambient level is less than the predetermined flash light threshold, triggering at least one flash module of the image capturing device to illuminate the current scene during capture of image data by the at least one camera.