Optical Apparatus Ray Direction Distinction
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Solution Overview
Problem
Existing contactless object shape measurement technologies face challenges in accurately distinguishing the direction of rays with close wavelength spectra, leading to errors in shape calculation, especially when ambient light interference is significant.
Innovation Solution
An optical apparatus that emits rays with different wavelengths, using a processing unit to calculate ray directions based on discrete hue pixel values, and sets threshold values to distinguish between overlapping wavelength filters, allowing for accurate shape measurement even with close wavelength spectra.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple rays with close wavelength spectra are used for illumination, then measurement coverage is improved, but ray direction distinction accuracy deteriorates
Solution Approach 1:
The imaging device segments the spectrum into multiple discrete wavelength bands using wavelength filters, with each pixel or pixel group assigned to a specific wavelength range. This segmentation allows distinct detection of rays with close wavelengths by mapping them to different spatial locations in the image sensor, thereby resolving the contradiction between using multiple wavelengths for coverage and maintaining direction distinction accuracy.
2Measurement precision
If ambient light filtering is strengthened to reduce interference, then measurement accuracy is improved, but light intensity reaches the imaging device decreases
Solution Approach 1:
The patent applies wavelength-specific filtering at the pixel level rather than uniformly across the entire image sensor. Each pixel or small group of pixels has a wavelength filter optimized for its specific detection band, allowing maximum transmission of desired wavelengths while blocking ambient light in other bands. This local quality approach maintains measurement accuracy without excessively reducing overall light intensity.
3Measurement precision
If wavelength filters with overlapping spectra are used, then measurement precision is improved, but distinction between filters becomes difficult
Solution Approach 1:
The patent introduces a processing device as an intermediary that receives raw images from the imaging device and performs computational separation of overlapping wavelength components. The processing device uses algorithms to distinguish and separate rays based on their wavelength characteristics, even when the physical filters have overlapping transmission spectra. This computational intermediary resolves the difficulty of physically distinguishing filters while maintaining measurement precision.
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
The optical apparatus effectively distinguishes ray directions and calculates the shape of objects with improved accuracy, reducing errors caused by ambient light interference and close wavelength spectra, and allows for faster measurement processes.
Implementation Method 1
The illumination unit emits a first ray having a first wavelength and a second ray having a second wavelength different from the first wavelength to an object. The imaging unit includes a first pixel which receives the first ray emitted to the object and a second pixel which receives the second ray emitted to the object
Data Source
AI summary
According to an embodiment, an optical apparatus includes an illumination unit, an imaging unit and a processing unit. The illumination unit emits a first ray having a first wavelength and a second ray having a second wavelength different from the first wavelength to an object. The imaging unit includes a first pixel which receives the first ray emitted to the object and a second pixel which receives the second ray emitted to the object to capture an image based on the first ray received by the first pixel and the second ray received by the second pixel. The processing unit calculates a first ray direction of the first ray and a second ray direction of the second ray based on the image captured by the imaging unit.