Image Sensor Brightness Compensation for Financial Device Medium Detection
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Solution Overview
Problem
Existing medium image detection apparatuses in financial devices suffer from deteriorated recognition performance due to variations in transferring speed and ambient temperature, which affect image brightness.
Innovation Solution
An apparatus comprising an image sensor with a light emitting unit and a light receiving unit, along with a reference medium positioned off the transferring path, uses a control unit to compensate images by comparing the brightness of a real-time reference image to a stored reference image, ensuring constant brightness and improved recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an image sensor is used to obtain images of a medium during transfer, then the medium can be detected and recognized, but the image brightness varies due to transferring speed variations and ambient temperature changes, deteriorating recognition performance
Solution Approach 1:
A reference medium is introduced as an intermediary element to mediate between the varying environmental conditions and the image sensor. The reference medium provides a stable reference image that can be used to compensate for brightness variations in the actual medium images, thereby maintaining consistent image quality despite changes in transferring speed or ambient temperature.
Solution Approach 2:
The system dynamically adjusts image processing parameters based on real-time conditions by comparing the current reference image with a stored reference image. This allows the system to compensate for brightness variations caused by parameter changes in the environment (temperature, speed) and maintain optimal image quality for recognition.
2Productivity
If the image sensor operates under varying ambient temperature and transferring speed conditions, then the financial device can process media continuously, but the image quality deteriorates due to brightness changes
Solution Approach 1:
The system implements a feedback mechanism by continuously capturing images of the reference medium and comparing them with a stored reference image. This feedback loop allows the system to detect brightness variations caused by environmental changes and continuously adjust the image processing to compensate for these variations, maintaining stable image quality during continuous operation.
Solution Approach 2:
A reference image of the reference medium is captured and stored in advance under known conditions. This preliminary reference image serves as a baseline for comparing subsequent images, allowing the system to pre-establish a standard against which to measure and compensate for environmental variations during continuous processing.
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
This approach maintains consistent image brightness and enhances recognition performance by compensating for changes in transferring speed and ambient temperature, thereby preventing image deterioration.
Implementation Method 1
an image sensor comprising a light emitting unit to emit light toward a medium transferred along a transferring path and a light receiving unit to receive the light emitted from the light emitting unit
Data Source
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AI summary
The present specification relates to an apparatus for detecting a medium image. According to one aspect, the apparatus for detecting the medium image comprises: a light emitting unit to emit the light toward the medium to be transferred along a transferring path; an image sensor having a light receiving unit to receive the light emitted from the light emitting unit; a reference medium which is arranged at a position separated from the transferring path and enables the image sensor to obtain an image; and a control unit to compensate the image of the medium obtained from the image sensor using the image of the reference medium obtained from the image sensor.