Color Sensing Device 16-bit to 8-bit RGB Conversion
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Solution Overview
Problem
Existing color sensing devices face challenges in accurately discriminating subtle color differences, especially when a reference white color is not available, leading to difficulties in converting 16-bit RGB component sensed values into 8-bit values, resulting in lopsided color representations that fail to distinguish between various colors effectively.
Innovation Solution
A color sensing device configuration that includes a white LED, a color sensor, and a controller, which converts 16-bit RGB component sensed values into 8-bit values using either the maximum or minimum values calculated in advance, allowing for the use of a virtual reference white color or a predetermined minimum value to enhance color resolution and discrimination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If 16-bit RGB component sensed values are directly converted to 8-bit values using conventional methods, then the conversion process is simple, but the color resolution and discrimination capability deteriorate
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing conversion parameters (maximum values and minimum values) during a calibration phase before actual color sensing operations. The controller stores these parameters in memory, so that during runtime, the 16-bit to 8-bit conversion can be performed efficiently using these pre-computed values, maintaining both high color resolution and operational simplicity.
Solution Approach 2:
The patent changes the conversion parameters dynamically based on the specific measurement target object being sensed. Instead of using fixed conversion parameters, the system adjusts the maximum and minimum values used in conversion based on the actual color range detected for each target object, thereby optimizing color resolution for different objects while managing conversion complexity through adaptive parameter selection.
2Measurement precision
If a reference white color is used for conversion, then color accuracy is improved, but the requirement for a specified reference white color increases device complexity and limits versatility
Solution Approach 1:
The patent creates a virtual reference white color by calculating the maximum values of RGB components from multiple measurement target objects during calibration. This virtual reference white copy replaces the need for a physical reference white color standard, allowing the system to achieve color accuracy equivalent to using a reference white without requiring one to be physically present, thereby enhancing versatility.
Solution Approach 2:
The patent makes the color sensing device universal by enabling it to function accurately with or without a specified reference white color. The system can adapt to different measurement target objects and environments by using the virtual reference white or predetermined minimum values, allowing the same device to maintain color accuracy across diverse applications without requiring reference white standards.
3Measurement precision
If conventional conversion methods are used, then the conversion process is fast, but the ability to distinguish subtle color differences deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-calculating the maximum and minimum RGB values during a calibration phase and storing these parameters in memory. During actual color sensing operations, the system performs rapid 16-bit to 8-bit conversion using these pre-computed parameters, achieving both high color discrimination capability and fast conversion speed without recalculating parameters in real-time.
Solution Approach 2:
The patent optimizes conversion parameters based on the actual color range detected for each measurement target object. By dynamically adjusting the maximum and minimum values used in conversion to match the specific target object's color characteristics, the system enhances subtle color difference discrimination while maintaining efficient conversion throughput through adaptive parameter optimization.
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 improved color resolution and discrimination among colors, even without a specified reference white color, by dispersing 8-bit converted values between 50 and 255, effectively enhancing the ability to distinguish subtle color differences.
Implementation Method 1
a white LED that shines white light to a measurement target object
Implementation Method 2
a color sensor that receives the reflected light reflected from the measurement target object to output an R (red) component sensed value, a G (green) component sensed value, and a B (blue) component sensed value
Data Source
AI summary
A color sensing device (8) includes: a light source (6) that shines white light to a measurement target object (3); a color sensor (5) that receives the light reflected from the measurement target object to output an R (red) component sensed value, a G (green) component sensed value, and a B (blue) component sensed value each with a first predetermined number of bits; and a converter (7) that converts the R, G, and B component sensed values output from the color sensor respectively into sensed values each with a second predetermined number of bits smaller than the first predetermined number of bits based on the respective maximum values of R, G, and B component measured values measured in advance by a color sensor with respect to a plurality of kinds of measurement target objects.