RGB Color Index Sensor for Easier Object Detection Thresholds
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Solution Overview
Problem
Conventional color sensors face difficulties in accurately determining color differences due to variations in light reflection and require complex processing of R, G, and B values, making it challenging to set appropriate threshold values for object detection, particularly in cases where multiple colors change simultaneously.
Innovation Solution
A sensor device that projects light, detects reflected light, calculates a single color index value based on R, G, and B values, and compares it with a threshold value to determine object presence, with optional RGB value correction to account for individual unit variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional color sensors process R, G, and B values to distinguish color differences, then color information can be captured, but it becomes difficult to set threshold values for judging color differences when multiple colors change simultaneously
Solution Approach 1:
The patent extracts the essential color difference information from the complex R, G, and B value processing by calculating a single color difference value derived from these values. This extracted single value simplifies the threshold setting process while maintaining the ability to detect color differences accurately, resolving the contradiction between measurement precision and ease of operation.
2Loss of information
If three color values (R, G, B) are processed to distinguish color differences, then color information is obtained, but the complexity of information processing increases making it difficult to handle simultaneous color changes
Solution Approach 1:
The patent merges the R, G, and B color values into a single color difference value through a calculation process. This consolidation reduces the processing complexity from handling three separate color channels to managing one integrated value, while still preserving complete color difference information necessary for detecting simultaneous color changes.
3Productivity
If threshold values are not set properly due to variations in light reflection and processing, then color detection can be performed, but accuracy in judging colors deteriorates
Solution Approach 1:
The patent transforms the color detection approach by changing from using multiple color values (R, G, B) to using a single color difference value as the detection parameter. This parameter transformation simplifies threshold setting and improves both detection speed and accuracy by eliminating the complexity of handling multiple color channels with varying light reflection characteristics.
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
Facilitates easy setting of determination thresholds, improving user convenience and accuracy in object detection by simplifying the comparison process.
Implementation Method 1
The light reception unit detects reflected light from an area illuminated with light projected from the light projection unit
Data Source
AI summary
A sensor device 10 includes a light projection unit 14, a light reception unit 15, an RGB value acquisition unit 22, a color index value calculation unit 24, and a determination unit 16. The light projection unit 14 projects light. The light reception unit 15 detects reflected light from an area illuminated with the light projected from the light projection unit 14. The RGB value acquisition unit 22 acquires color information about an object present in the illumination area on the basis of the reflected light detected by the light reception unit 15. The color index value calculation unit 24 calculates a single color index value on the basis of the R value, G value, and B value included in the color information acquired by the RGB value acquisition unit 22. The determination unit 16 compares the color index value calculated by the color index value calculation unit 24 with a specific threshold value to determine whether or not an object has been detected.