Palm Imaging Exposure Control With Supplemental Illumination
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Solution Overview
Problem
In palm swiping payment scenarios, environmental light changes significantly, causing the palm to block original light and making it difficult to collect clear palmprint images, leading to swiping failures.
Innovation Solution
A method and apparatus that adjust the camera's exposure mode from fixed to automatic exposure after illuminating the palm with a high-brightness lamp, collecting multiple images, and selecting one with sufficient quality for verification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the camera uses fixed exposure mode for palm imaging, then the imaging speed is fast, but the image quality deteriorates under varying environmental light conditions
Solution Approach 1:
The patent applies dynamics by switching from fixed exposure mode to automatic exposure mode based on environmental light conditions. The system dynamically adjusts exposure parameters (shutter speed, aperture, ISO) according to the detected light intensity, allowing fast imaging in stable light conditions while maintaining high image quality when light conditions vary.
Solution Approach 2:
The patent changes exposure parameters (shutter speed, aperture, ISO) based on environmental light conditions. The control unit monitors light intensity and adjusts these parameters to optimize image quality while maintaining imaging speed, resolving the contradiction between fast imaging and quality under varying light.
2Device complexity
If the palm swiping device relies on environmental light, then the device complexity is low, but the image quality deteriorates when the palm blocks original light
Solution Approach 1:
The patent introduces an intermediary illumination source (lamp) to provide supplemental light when the palm blocks environmental light. This mediator compensates for light blockage without requiring complex device redesign, maintaining simplicity while improving image quality under palm swiping conditions.
Solution Approach 2:
The system performs preliminary detection of environmental light conditions and proactively adjusts exposure parameters or activates supplemental illumination before image capture. This preliminary action ensures optimal image quality is achieved even when the palm blocks light during the swiping process.
3Manufacturing precision
If multiple shot images are taken in automatic exposure mode, then the image quality is improved, but the swiping time increases
Solution Approach 1:
The patent implements feedback by evaluating the quality of captured images and using this information to adjust subsequent shooting decisions. The system takes multiple shots only when necessary (based on light condition analysis and initial image quality assessment), reducing unnecessary delays while ensuring high-quality images are captured when conditions warrant multiple attempts.
Solution Approach 2:
The system takes a limited number of shots (M shots) rather than continuous photographing. This partial action approach captures sufficient quality images for recognition while limiting the time penalty, balancing image quality improvement with swiping speed requirements.
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
Ensures clear imaging of the palm under varying light conditions, increasing the success rate of palm swiping by providing sufficient illumination and optimizing exposure times.
Implementation Method 1
a lamp is set to an illumination mode, the lamp provides a supplemental light
Implementation Method 2
M shot images are taken by the camera based on the automatic exposure mode
Data Source
AI summary
Aspects of the disclosure provide a method of photographing control. For example, according to an image collection instruction, a lamp is set to an illumination mode. The lamp provides a supplemental light with a supplementation intensity exceeding a preset intensity threshold in the illumination mode. A photographing mode of a camera is adjusted from a fixed exposure mode to an automatic exposure mode. The automatic exposure mode uses a fixed exposure parameter value of the fixed exposure mode as an initial exposure parameter value. M shot images are taken by the camera based on the automatic exposure mode with the initial exposure parameter value. M is an integer greater than or equal to 1. A target shot image is determined from the M shot images. The target shot image has an image quality satisfying a preset image quality requirement. Apparatus and non-transitory computer-readable storage medium counterpart embodiments are also contemplated.