Optical Processing Apparatus Luminance Adjustment for Image Quality
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Solution Overview
Problem
Conventional optical processing apparatuses face challenges in maintaining image quality due to variations in luminance, as they either adjust exposure time or gain values, which can limit frame rate or introduce noise, respectively, failing to consistently produce images of desirable quality for accurate determinations.
Innovation Solution
An optical processing apparatus that adjusts light source luminance values at multiple time instants within a frame capturing period, calculates image quality indices, and selects optimal images or adjusts luminance ranges based on quality thresholds to ensure consistent image quality for accurate button state and displacement calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If exposure time length is extended to capture darker images, then image brightness quality is improved, but frame rate is limited
Solution Approach 1:
The patent changes the luminance parameter of the light source instead of changing exposure time. By dynamically adjusting the light source luminance to match the scene brightness, the system achieves proper image exposure without extending exposure time, thus maintaining high frame rates while ensuring image quality.
2Illumination intensity
If gain value is increased to capture darker images, then image brightness quality is improved, but noise is introduced
Solution Approach 1:
The patent changes the luminance parameter of the light source instead of changing the gain value. By adjusting the light source luminance to match the scene brightness, the system achieves proper image exposure without increasing gain, thus avoiding noise introduction while ensuring image quality.
Solution Approach 2:
The patent replaces the electronic gain amplification mechanism with an optical solution - adjusting the light source luminance. This substitution avoids the noise amplification that occurs with electronic gain adjustment while achieving the same goal of proper image exposure.
3Illumination intensity
If light source luminance is adjusted to match scene brightness, then image quality is improved, but device complexity increases
Solution Approach 1:
The patent implements a feedback mechanism where the processing unit detects scene brightness and dynamically adjusts light source luminance accordingly. This closed-loop control ensures optimal image quality while managing complexity through automated adaptive adjustment rather than manual intervention.
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 allows for improved image quality management, reducing noise and frame rate limitations, while ensuring that images used for determinations are of high quality, thereby enhancing the reliability of optical processing operations.
Implementation Method 1
a light source unit (11) configured to provide a beam of light to a surface of a button
Implementation Method 2
generate a reflected light beam reflected from the surface of the button
Implementation Method 3
an image sensing unit (15) configured to capture the reflected light beam to output a first image
Data Source
AI summary
An optical processing apparatus and a light source luminance adjustment method adapted to detect a rotational displacement and a pressing state are provided. The optical processing apparatus includes a light source unit, a processing unit, and an image sensing unit, wherein the processing unit is electrically connected to the light source unit and the image sensing unit. The light source unit provides a beam of light. The processing unit defines a frame rate, defines a plurality of time instants within a time interval, and sets the light source unit to a luminance value at each of the time instants. A length of the time interval is shorter than the reciprocal of the frame rate. The luminance values are different and are within a range. The image sensing unit captures an image by an exposure time length at each of the time instants, wherein the exposure time lengths are the same.