Image Processing Device Adjusting Capture Angle to Avoid Backlight
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Solution Overview
Problem
Image capture devices installed in fixed positions, such as ATMs and vending machines, face challenges in accurately capturing images for face authentication due to backlight or low light environments, which reduces the accuracy of face detection and authentication.
Innovation Solution
An image processing device that includes a light quantity measurement unit, an identification unit, and an image-capture angle adjustment mechanism to identify and avoid regions with high light quantities, allowing for optimal image capture angles to prevent backlight and ensure better image quality for authentication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the image capture device is installed at a fixed position, then the device structure is simple and easy to install, but the image quality deteriorates due to backlight or low light environments
Solution Approach 1:
The patent applies the dynamics principle by making the image capture angle adjustable rather than fixed. The image capturing unit can change its capture angle according to light quantity measurements, transforming a static system into a dynamic one that adapts to environmental conditions. This resolves the contradiction by maintaining simple installation (fixed position) while improving image quality through angle adjustment capability.
2Ease of operation
If the image capture device captures images at a fixed angle, then the operation is simple, but the face authentication accuracy deteriorates due to backlight interference
Solution Approach 1:
The patent implements feedback by using the light quantity measurement unit to detect environmental lighting conditions and automatically adjusting the image capture angle based on this feedback. The system measures light quantity, identifies high light quantity regions, and adjusts the capture angle accordingly. This automated feedback loop maintains operational simplicity while significantly improving face authentication accuracy by avoiding backlight interference.
3Area of stationary object
If the device captures images in high light quantity regions, then the image capturing range covers more areas, but the image quality deteriorates due to backlight effects
Solution Approach 1:
The patent applies local quality by making different parts of the system perform different functions: the light quantity measurement unit monitors specific regions for high light quantity areas, while the image capture unit adjusts its angle to avoid those specific problematic regions. This localized detection and avoidance strategy allows the system to maintain a wide effective capturing range while excluding specific high light quantity regions that would degrade image quality.
Data Source
AI summary
An image processing device includes: a measuring unit that measures a light quantity; an identification unit that identifies a region within an image-capturing range using the measured light quantity, the region having a light quantity higher than or equal to a predetermined light quantity; a setting unit that sets an image-capturing angle so that the identified region is out of the image-capturing range; and an image-capturing unit that captures an image for authentication at the image-capturing angle set by the setting unit.