Rotatable Color Reference Board Wheel for Document Scanners
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Solution Overview
Problem
Existing document reading apparatuses face challenges in flexibly changing color reference boards to match varying document background colors, leading to inefficient edge extraction and potential show-through of the reference board in scanned images.
Innovation Solution
A document reading apparatus with a detachable document cover and coupling mechanism that allows multiple color reference boards with different reflectance surfaces to be easily swapped and positioned, ensuring accurate alignment and reduced misalignment, enabling flexible selection based on document background color.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple color reference boards are provided for different document background colors, then the accuracy of edge extraction is improved, but the device complexity and storage space increase
Solution Approach 1:
Multiple color reference boards with different reflectance values are integrated into a single rotatable wheel structure. The wheel contains multiple slots, each holding a color reference board of different color. By rotating the wheel, different color reference boards can be selectively positioned for use, thereby reducing storage space and device complexity while maintaining the capability to handle various document background colors.
2Measurement precision
If multiple color reference boards are provided for different document background colors, then the accuracy of edge extraction is improved, but the time required to switch between boards increases
Solution Approach 1:
Multiple color reference boards are pre-positioned in the rotatable wheel at predetermined angular positions. The control unit calculates the optimal color reference board based on the detected document background color and pre-rotates the wheel to position the appropriate board in the reading position before actual scanning begins. This preliminary positioning eliminates the need for time-consuming manual switching or sequential searching during the scanning process.
Solution Approach 2:
The system includes a color detection unit that detects the background color of the document and provides feedback to the control unit. Based on this feedback, the control unit determines the most suitable color reference board and actuates the rotatable wheel to position the appropriate board. This closed-loop feedback mechanism ensures rapid and accurate selection of the color reference board, minimizing switching time while maintaining edge extraction accuracy.
3Adaptability or versatility
If a detachable clamping member with different colored surfaces is used, then the adaptability to different document colors is improved, but the ease of operation decreases
Solution Approach 1:
The manual operation of detaching and reattaching clamping members with different colored surfaces is replaced by an automated rotatable wheel mechanism. The wheel is rotated by a drive unit (such as a motor) to position the required color reference board in the reading position. This mechanical substitution eliminates the need for manual detachment and reattachment operations, significantly improving ease of operation while maintaining adaptability to different document colors.
Data Source
AI summary
Provided is a document reading apparatus wherein plurality of color reference boards can be flexibly changed. A document reading apparatus includes a document reading module, a document cover provided at a position where the document cover faces against the document reading module, an abutment portion provided in the document cover, a plurality of color reference boards detachably set up relative to the document cover, and a coupling portion that couples the plurality of color reference boards together and that abuts against the abutment portion. Each of the plurality of color reference boards includes a surface that faces against the document reading module and that has different reflectance.