Image Processing Device Random Sampling Moire Prevention
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Solution Overview
Problem
Conventional image processing devices experience moire issues due to constant sampling intervals when acquiring reflected light from objects using multiple light sources.
Innovation Solution
An image processing device that includes a controller, a sensor unit, and an illuminator with multiple light sources, where a random number is used to select a light source for emitting light, preventing moire by varying the sampling intervals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If constant sampling intervals are used to acquire reflected light from the object, then the image acquisition process is simple and systematic, but moire occurs due to the regular sampling pattern
Solution Approach 1:
The patent applies dynamics by changing the sampling interval from a constant value to a variable value that changes over time. The controller varies the sampling interval dynamically to acquire luminance data at irregular intervals, which prevents the formation of moire patterns while maintaining systematic image acquisition.
Solution Approach 2:
The patent changes the parameter of sampling interval from a fixed constant to a variable parameter. By adjusting the sampling interval to different values at different times, the system avoids regular sampling patterns that cause moire while keeping the acquisition process manageable through controlled variation.
2Loss of information
If multiple light sources are used to illuminate the object with different colors, then color information is enhanced, but moire occurs due to the interaction of multiple light sources with constant sampling
Solution Approach 1:
The patent uses dynamics by varying the sampling interval when acquiring luminance data from multiple light sources. Instead of using constant intervals that cause moire with multiple color channels, the system dynamically adjusts the sampling timing to prevent interference patterns while capturing comprehensive color information from all light sources.
Solution Approach 2:
The patent changes the sampling interval parameter to prevent moire when multiple light sources are active. By varying this parameter across different sampling instances, the system maintains color information integrity from multiple wavelengths without the regular pattern interference that would otherwise occur.
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
The solution effectively prevents moire occurrences by randomly selecting light sources, ensuring accurate image acquisition and processing without the limitations of constant sampling intervals.
Implementation Method 1
a sensor unit to output luminance data for one line obtained by photoelectrically converting light is reflected from the object
Data Source
AI summary
An image processing device that acquires an image from an object includes an illuminator having a plurality of light sources, a sensor unit, and a controller. The plurality of light sources irradiates light of respectively different colors onto an object. The sensor unit outputs luminance data for one line obtained by photoelectrically converting light is reflected from the object of that was irradiated by the illuminator onto the object. The controller acquires a random number, and acquires luminance data for one line output by the sensor unit, while causing one light source selected from the plurality of light sources based on the acquired random number to emit light.