Image Reading Device Shading Correction Adaptation
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Solution Overview
Problem
Conventional image reading devices face delays in starting the reading process due to the need for acquiring white and black reference values, and using fixed black reference values regardless of device conditions leads to inadequate shading correction of image data.
Innovation Solution
An image reading device that generates dark output data based on read data from the light receiving unit when the light source is not emitting light, determines if this data falls within a prescribed range, and uses either stored reference correction data or newly generated correction data to correct the image data accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If fixed black reference values are used before reading the original document, then the reading process can start quickly, but the shading correction of image data becomes inadequate due to variations in device conditions
Solution Approach 1:
The patent implements a dynamic reference value selection mechanism that adapts to current device conditions. The control device determines whether to use stored reference correction data or newly generated correction data based on comparison of dark output data with reference dark output data, allowing the system to transition between static and dynamic operation modes to balance speed and accuracy requirements
Solution Approach 2:
The patent changes the parameter of reference data freshness based on device conditions. When dark output data falls within a prescribed range of reference dark output data, the system uses stored reference correction data for quick operation. When the range is exceeded, the system generates new correction data to maintain accuracy, thus adapting the correction data parameter to match current device state
2Measurement precision
If white and black reference values are acquired before reading the original document, then proper shading correction can be achieved, but the reading process is delayed
Solution Approach 1:
The patent applies partial action by acquiring only white reference data before reading the original document, while using fixed black reference values stored beforehand. This partial acquisition approach enables the reading process to start quickly while still achieving adequate shading correction for many cases. The system then provides an option to perform full reference value acquisition when higher precision is needed
3Productivity
If dark output data is not checked against reference range, then the system operates faster, but image reading data cannot be properly corrected when device conditions change
Solution Approach 1:
The patent implements a feedback mechanism where the control device continuously monitors dark output data and compares it against reference dark output data stored in the storage device. This feedback loop enables the system to detect changes in device conditions and automatically switch between using stored reference correction data and newly generated correction data, maintaining both speed and reliability through adaptive response
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
Enables quick start-up of the reading process while ensuring proper shading correction of image data, reducing the time from user input to document reading and adapting to varying device conditions.
Implementation Method 1
The light source may be configured to emit light
Implementation Method 2
The light receiving unit may be configured to receive light
Data Source
AI summary
In an image reading device, a storing device stores reference dark output data and reference correction data. A control device, after a command receiving unit receives an instruction to read an original document, generates dark output data based on read data while the light source does not emit light. The control device determines whether the dark output data is within a first prescribed range into which the reference dark output data falls. The control device selects the reference correction data as selected correction data, when determining that the dark output data is within the first prescribed range. The control device generate correction data to correct the image data when determining that the dark output data is not within the first prescribed range, and selects the generated correction data as the selected correction data. The control device corrects the image data by using the selected correction data.