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Solution Overview
Problem
Conventional optical processing apparatuses face challenges in maintaining image quality due to variations in luminance, leading to poor image capture and subsequent processing inaccuracies, as they either adjust exposure time or gain values, which can limit frame rate or introduce noise.
Innovation Solution
An optical processing apparatus that adjusts light source luminance based on image quality indices, selecting optimal images for displacement calculation and adjusting luminance ranges to ensure desirable image quality without altering exposure time or gain values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If exposure time length is extended to capture darker images, then image brightness is improved, but frame rate is reduced
Solution Approach 1:
The patent changes the luminance parameter of the light source dynamically based on image quality assessment. When images are captured at high luminance levels (causing saturation or loss of detail), the system reduces the light source luminance for subsequent captures, thereby maintaining optimal image quality without extending exposure time and preserving frame rate.
2Illumination intensity
If gain value is increased to capture darker images, then image brightness is improved, but noise is introduced
Solution Approach 1:
Instead of increasing the gain value which amplifies noise, the patent adjusts the light source luminance parameter. By reducing the luminance of the light source when images are too bright, the system avoids the need for high gain settings and thereby prevents noise introduction while maintaining image quality.
3Illumination intensity
If light source luminance is increased to improve image brightness, then image quality is improved, but image saturation occurs
Solution Approach 1:
The patent implements a feedback mechanism where captured images are evaluated for quality metrics including brightness and saturation. When images are found to be overexposed or saturated, the system uses this feedback to reduce the light source luminance for subsequent captures, thereby maintaining optimal image quality and preventing saturation.
4Reliability
If light source luminance is reduced to avoid saturation, then image quality is improved, but image becomes too dark
Solution Approach 1:
The feedback mechanism continuously monitors image quality metrics including brightness levels. When images are captured at low luminance levels causing them to be too dark, the system increases the light source luminance for subsequent captures, ensuring optimal brightness without saturation.
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 maintains high image quality and frame rate while reducing noise, as it dynamically adjusts light source luminance to match image quality requirements, improving the reliability of subsequent processing operations.
Implementation Method 1
a light source configured to emit light to go through a through hole of a rotary shaft to a surface of a rotary part of a button
Implementation Method 2
generate a reflected light beam reflected from the surface of the rotary part of the button
Implementation Method 3
an image sensor configured to capture the reflected light beam to generate an image signal
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.