Brightness Compensation for Uniform Illumination in Scanning Systems
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Solution Overview
Problem
Conventional scanning systems experience non-uniform brightness across pages due to the gradual increase in lamp brightness during document scanning, leading to suboptimal scanning quality.
Innovation Solution
A brightness compensation apparatus and method that includes a light source, image sensor, analog-front-end, and a brightness compensation system with a statistic window control unit, brightness statistic logic unit, and comparison logic unit to adjust the brightness of each page to match a target value, using pulse width modulation and voltage control signals to ensure consistent illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the scanner uses a lamp to illuminate document pages during scanning, then the document pages can be scanned into electrical documents, but the lamp brightness gradually increases with the increment of scanned pages causing non-uniform brightness across pages
Solution Approach 1:
The patent implements a feedback control mechanism where the control unit continuously monitors the lamp brightness during scanning operations. When brightness deviation from the preset standard is detected, the control unit automatically adjusts the lamp brightness in real-time to maintain uniform illumination across all scanned pages, thereby resolving the contradiction between high scanning speed and brightness uniformity.
Solution Approach 2:
The patent dynamically changes the lamp brightness parameter during the scanning process. Instead of maintaining a fixed brightness level, the system adjusts the brightness parameter adaptively based on the scanning progress and detected illumination conditions, ensuring consistent brightness uniformity while maintaining high scanning productivity.
2Ease of operation
If the scanner operates without brightness compensation, then the scanning process is simple and fast, but the scanning quality is affected due to brightness differences between pages
Solution Approach 1:
The patent implements a self-service brightness compensation mechanism where the control unit automatically detects brightness deviations and adjusts lamp brightness without requiring manual intervention. The system monitors its own operational parameters and performs self-correction, maintaining high scanning quality while preserving operational simplicity and avoiding complex manual adjustment procedures.
3Device complexity
If the scanner uses constant voltage to drive the lamp, then the circuit design is simple, but the illuminance of each page becomes variable degrading scanning quality
Solution Approach 1:
The patent transitions from a static constant voltage driving approach to a dynamic brightness control system. The control unit continuously adjusts the lamp brightness based on real-time monitoring of illumination conditions, enabling the system to adapt to changing scanning requirements and maintain consistent illuminance across pages while managing circuit complexity through integrated control logic.
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
The solution achieves uniform brightness across pages, enhancing scanning quality by instantly detecting and compensating brightness differences, thereby improving the clarity and consistency of scanned documents.
Implementation Method 1
The light source generates a brightness to illuminate the pages
Implementation Method 2
The inverter coupled to the second voltage control circuit receives the DC voltage and outputs an alternating current (AC) voltage with high level in order to control the brightness
Data Source
AI summary
A scanning system having a brightness compensation apparatus and method thereof are described. The brightness compensation apparatus includes a statistics window control unit, a brightness statistics logic unit, and a comparing logic unit. The statistics window control unit sets a statistics window setting area. The brightness statistics logic unit generates the current brightness statistics data corresponding to the current page. The comparing logic unit compares the current brightness statistics data with brightness target value to determine whether the brightness compensation apparatus compensates the brightness of next page based on the comparison result and/or image gain of the current page for adjusting the brightness of the scanning system according to the compared result between the brightness statistic data and the brightness target value.