RGB sensors work by measuring the intensity of red, green, and blue light components reflected from an object. This allows the sensor to determine the object's color.
Here's a breakdown of the process:
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Illumination: The sensor typically emits white light, which contains all colors of the spectrum (including red, green, and blue).
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Reflection: This white light shines onto the object being sensed. The object absorbs some wavelengths (colors) of the light and reflects others. The color we perceive is the result of the reflected light. For example, a red object primarily reflects red light and absorbs most of the green and blue light.
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Filtering: The reflected light enters the sensor, where it passes through three color filters: a red filter, a green filter, and a blue filter.
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Detection: Each filter allows only its corresponding color of light to pass through to a photodiode (a light-sensitive electronic component). The photodiode measures the intensity (brightness) of the light that passes through the filter.
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Signal Processing: The sensor then generates electrical signals corresponding to the intensity of the red, green, and blue light. These signals are typically converted into digital values.
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Color Determination: By analyzing the relative strengths of the red, green, and blue signals, the sensor can determine the color of the object. For example, a high red value, a low green value, and a low blue value would indicate a red object.
In summary, RGB sensors illuminate an object with white light, measure the intensity of the reflected red, green, and blue components, and then determine the color of the object based on the relative strengths of these components.
