Document Reading Device Dynamic Background Range Adjustment
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Solution Overview
Problem
Existing reading devices face challenges in accurately detecting document regions from image data, particularly when the document type and background luminance values are similar, leading to decreased detection accuracy and increased time and effort for proper document reading.
Innovation Solution
A reading device with a control unit that acquires document information and sets a background range based on luminance values, using image data from a reading unit to differentiate between document and background regions, adjusting settings according to document type, thickness, and usage of carrier sheets to enhance detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed background range is used for document detection, then the device complexity is reduced, but the detection accuracy deteriorates when document luminance is similar to background luminance
Solution Approach 1:
The patent implements dynamic adjustment of the background range based on the detected document type. The control unit changes the background range parameters (such as luminance thresholds) according to the specific document category identified, allowing the system to adapt to different document characteristics rather than using a fixed background range for all document types.
Solution Approach 2:
The patent modifies the background range parameters dynamically based on document information. When the document type is identified, the control unit adjusts parameters such as the luminance value range that defines the background region, enabling accurate differentiation between document and background regions even when their luminance values are similar.
2Measurement precision
If document type-specific processing is implemented, then the detection accuracy is improved, but the ease of operation deteriorates due to multiple settings
Solution Approach 1:
The patent enables the reading device to automatically identify the document type and select the appropriate background range without requiring user intervention. The control unit performs document type classification based on image data and automatically configures the corresponding detection parameters, making the system self-optimizing and eliminating the need for manual setting adjustments by the user.
Solution Approach 2:
The patent pre-defines multiple background range configurations corresponding to different document types. Before actual document reading, the system performs preliminary document type classification and selects the appropriate pre-configured background range, preparing the optimal detection parameters in advance rather than requiring real-time manual adjustment.
3Reliability
If a single background range is used for all document types, then the ease of operation is maintained, but the reliability deteriorates for specific document types like those with carrier sheets
Solution Approach 1:
The patent implements dynamic adaptation of the background range based on detected document characteristics. When specific document types such as those with carrier sheets are identified, the system automatically adjusts the background range parameters to account for the additional layers and their optical properties, ensuring reliable detection across diverse document types.
Solution Approach 2:
The patent applies different background range configurations tailored to specific document types and reading scenarios. Instead of using a uniform background range for all cases, the system selects locally optimized parameters based on the detected document category, such as adjusting for carrier sheet presence, document thickness, or material properties.
Data Source
AI summary
A reading device includes a reading unit configured to read a document, and a control unit configured to acquire image data including a document region and a background region from the reading unit. The control unit acquires document information about a document, and sets, based on the document information, a background range indicating a range of a luminance value regarded as the background region.