Switchable Background Member for Show-Through Reduction
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Solution Overview
Problem
Conventional image reading apparatuses face challenges in performing show-through reduction and foundation color reduction processing efficiently, particularly when switching between different background colors, and require additional memory for histogram generation.
Innovation Solution
An image reading apparatus with a background member that can change colors, equipped with a determining part that adjusts the degree of image processing based on the background color and sheet thickness, using correction coefficients to optimize show-through and foundation color reduction processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a white background member is used to maintain color fidelity, then foundation color is preserved, but show-through phenomenon occurs with thin originals
Solution Approach 1:
The background member is made switchable between white and black colors. The system dynamically selects the appropriate background color based on original characteristics (thickness, foundation color) to either preserve color fidelity with white or eliminate show-through with black, resolving the contradiction between these two opposing requirements.
Solution Approach 2:
The invention changes the background color parameter from fixed white to variable (white or black). By adjusting this parameter based on detected original characteristics, the system optimizes image quality - using white for color fidelity when needed, and black for show-through reduction when originals are thin.
2Object-affected harmful factors
If a black background member is used to reduce show-through, then show-through is prevented, but foundation color is darkened and contrast is reduced
Solution Approach 1:
The switchable background member allows dynamic selection between black (for show-through reduction) and white (for color fidelity). The system determines the optimal background color based on original characteristics, applying black only when show-through is the primary concern while maintaining white for color-accurate scanning.
Solution Approach 2:
The background color parameter is changed from fixed black to variable (black or white). This parameter change allows the system to optimize between show-through reduction and color fidelity preservation by selecting the appropriate background color based on detected original properties.
3Measurement precision
If histogram generation is used for show-through and foundation color reduction, then image processing quality is improved, but additional memory is required
Solution Approach 1:
The invention extracts and uses only the essential color information from the original (foundation color and thickness) to determine background member selection and processing parameters. This selective approach achieves effective show-through and foundation color reduction without requiring comprehensive histogram generation, thereby reducing memory requirements while maintaining processing quality.
Solution Approach 2:
Instead of generating full histograms for image processing, the system creates simplified color profiles by sampling key color information. This copying approach captures the essential characteristics needed for show-through and foundation color reduction processing without the memory overhead of complete histogram data structures.
Data Source
AI summary
An image reading apparatus which is capable of appropriately performing show-through reduction processing and foundation color reduction processing in accordance with an operation for changing the color of a background member to another one having different color that is read along with an original. An image reading unit reads an image of a conveyed original. A background member has a white-colored member and a black-colored member and is disposed in such a manner that it opposed to the image reading unit. A moving unit moves the background member. A CPU determines a degree of image processing to be applied to read image data depending on the color of an opposing portion of the background member, which is opposed to the image reading unit that is reading an original.