Image Shading Correction Based on Tray and Cover States
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Solution Overview
Problem
Existing image reading apparatuses incur unnecessary processing time and hinder high-speed image reading by performing shading correction data acquisition unnecessarily, particularly when the platen cover is opened and closed for recovery or when checking if an original is left on the platen glass.
Innovation Solution
An image reading apparatus with sensors to detect the presence of an original on a tray and the state of a document feeder, generating specific shading correction data based on the detection results to prevent unnecessary data acquisition, allowing for efficient shading correction during platen cover and flow reading modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the image reading apparatus performs shading correction data acquisition every time the platen cover is opened and closed, then the shading correction can be performed for each reading mode, but the processing time increases and high-speed image reading is hindered
Solution Approach 1:
The system performs preliminary judgment about the reading mode before acquiring shading correction data. By detecting whether an original is present on the original tray using a sensor, the system determines in advance whether to acquire platen cover reading shading correction data or flow reading shading correction data, avoiding unnecessary acquisition operations and reducing processing time
Solution Approach 2:
The patent extracts the decision-making logic for shading correction data acquisition from a fixed sequence and makes it conditional. By separating the acquisition process into conditional branches based on original presence detection, the system eliminates unnecessary shading correction data acquisition operations while maintaining necessary corrections for the actual reading mode
2Reliability
If the image reading apparatus performs both platen cover reading and flow reading shading correction data acquisition when the original is placed on the original tray, then comprehensive shading correction is ensured, but unnecessary processing is performed
Solution Approach 1:
The system performs preliminary detection of original presence on the original tray before initiating shading correction data acquisition. This preliminary action allows the system to pre-determine the appropriate reading mode and acquire only the corresponding shading correction data, preventing unnecessary dual-mode acquisition and improving reading speed
Solution Approach 2:
The patent implements dynamic adjustment of the shading correction data acquisition process based on real-time sensor feedback. The system dynamically switches between platen cover reading mode and flow reading mode depending on whether an original is detected on the original tray, making the acquisition process adaptive rather than fixed
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 solution reduces processing time by avoiding unnecessary shading correction data acquisition, enabling high-speed image reading by optimizing data generation based on sensor detections during different operational states.
Implementation Method 1
a first sensor configured to detect that the original is placed on the original tray
Implementation Method 2
a second sensor configured to detect an open state and a closed state of the document feeder
Implementation Method 3
a reading unit configured to read one of the original placed on the original table and the original to be conveyed by the document feeder, the reading unit being configured to read the original placed on the original table under a state in which the reading unit is moving a reading position
Data Source
AI summary
Provided is an image reading apparatus configured to avoid unnecessarily performing shading correction processing. The image reading apparatus detects whether or not an original is placed on an original tray when detecting an open state of an ADF and then detecting a closed state thereof. In a case where the original is placed on the original tray, the image reading apparatus performs shading correction for flow reading, and in a case where no original is placed on the original tray, the image reading apparatus performs shading correction for platen cover reading.