Image Quality Inspection Camera Light Source Calibration
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Solution Overview
Problem
Current image quality inspection methods in printing apparatuses face challenges in achieving stable calibration due to texture unevenness and light quantity differences among multiple light sources, leading to nonuniformity in image quality during calibration.
Innovation Solution
An image quality inspection camera system utilizing multiple light sources and a camera, where a control section adjusts the light sources' driving signals to ensure each light source's representative luminance value meets a target condition, reducing nonuniformity by calculating and averaging luminance values from multiple pixels and integrating them to stabilize light quantity adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple light sources are used to reduce direction dependence and stabilize calibration, then calibration stability is improved, but light quantity nonuniformity among light sources worsens image quality
Solution Approach 1:
The patent applies parameter changes by adjusting the driving signal parameters of each light source individually. The control section calculates representative luminance values for each light source and modifies their driving signals to achieve uniform image brightness, thereby resolving the nonuniformity issue while maintaining calibration stability
Solution Approach 2:
The patent implements feedback by using the camera to photograph the medium and calculating representative luminance values from the captured images. This feedback loop allows the control section to determine and adjust driving signals for each light source based on actual measured luminance, ensuring uniform image quality across all light sources
2Measurement precision
If light quantity of light sources is adjusted to achieve favorable calibration, then calibration accuracy is improved, but complexity of light source control increases
Solution Approach 1:
The patent simplifies control complexity by focusing parameter adjustments on a single key parameter: the driving signal of each light source. By calculating representative luminance values and adjusting only the driving signal parameters, the system achieves accurate calibration without requiring complex multi-parameter control mechanisms
Solution Approach 2:
The system applies self-service by enabling each light source to be automatically adjusted based on its own measured representative luminance value. The control section independently determines and adjusts each light source's driving signal without requiring manual intervention or complex external control systems, thereby improving calibration accuracy while minimizing control complexity
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 approach enables accurate and stable light quantity adjustment for each light source, enhancing calibration accuracy and reducing the influence of texture unevenness, resulting in improved image quality inspection and calibration consistency.
Implementation Method 1
a camera for photographing the medium
Implementation Method 2
N (N≥2) light sources that emit light on a medium on which printing is performed
Data Source
AI summary
An image quality inspection camera system includes: N (integer of N≥2) light sources that emit light on a medium; a camera for photographing the medium; and a control section, in which the control section executes setting processing when an i-th light source (integer of i=1 to N) is lit with a reference driving signal, for setting an image quality inspection time driving signal of the i-th light source, and the setting processing includes calculating an i-th representative luminance value by performing a predetermined representative luminance value calculation processing based on a luminance value of each pixel photographed by the camera when the i-th light source is lit with the reference driving signal, and determining the image quality inspection time driving signal of the i-th light source by adjusting the reference driving signal such that the i-th representative luminance value satisfies a predetermined target luminance value condition.