3D scanning of transparent/mirror-like objects
===

> ### 關鍵字 ###
>#透明: Transparent, Transparency, glass
#鏡面: High reflectivity, specular, refractive, mirror-like, reflective
#3D 重建: 3D construction, 3D surface estimation, 3D model construction, shape recovery, visual reconstruction
#結構光: structured light

# [業界] 透明件3D輪廓偵測

## 1. [KEYENCE LJ X8020 8060 三角量測法]
> - 按照官網文件提供能檢測"玻璃" (https://www.keyence.com.tw/products/measure/laser-2d/lj-x8000/models/)

## 2. [KEYENCE WI_5000 由白光干涉原理]
- 不同材質顏色對白光干涉毫無影響 (應為技術發展方向)(https://www.keyence.com.tw/products/measure/interference/wi-5000/downloads/?mode=ca)

## 3. [SuperView W1系列]
- 白光干涉技术为原理、结合精密Z向扫描模块、3D 建模算法等对器件表面进行非接触式扫描并建立表面3D图像
- (https://www.chotest.com/detail.aspx?cid=686)

# [Paper] Transparent objects

https://scholar.google.com.tw/scholar?hl=zh-TW&as_sdt=0%2C5&q=3D+structured+light+Profiler+of+transparent+objects&btnG=
## 1. [Non Contact 3D Measurement Scheme for Transparent Objects Using UV Structured light](https://ieeexplore.ieee.org/document/5597251)
> - UV laser triangulation.


## 2. [3D scanning of transparent objects](https://tel.archives-ouvertes.fr/file/index/docid/584061/filename/these_A_EREN_Gonen_2010.pdf)
> - Scanning From Heating.
> - Heated with a laser source.
> - Computed triangulation.
> 

## 3. [Structured-light modulation analysis technique for contamination and defect detection of specular surfaces and transparent objects](https://www.osapublishing.org/oe/fulltext.cfm?uri=oe-27-26-37721&id=424061)

## 4. [Polarization and Phase-Shifting for 3D Scanning of Translucent Objects](http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.85.4431&rep=rep1&type=pdf)
> - Using polarization-difference imaging subsurface scattering can be filtered out.
> - Descattering by Phase-shifting at sufficiently high frequency.

## 5. [Fast surface profiler by white-light interferometry using a new algorithm, the SEST algorithm](https://www.spiedigitallibrary.org/conference-proceedings-of-spie/4451/0000/Fast-surface-profiler-by-white-light-interferometry-using-a-new/10.1117/12.453634.full)
> - Fast algorithm for surface profiling by white- light interferometry

## 6. [High-speed noncontact profiler based on scanning white-light interferometry](https://www.osapublishing.org/ao/viewmedia.cfm?uri=ao-33-31-7334&seq=0)
> - System for fast three-dimensional profilometry, of both optically smooth and optically rough surfaces, based on scanning white-light techniques

## 7. [Measurement errors of mirrorlike, tilted objects in white light interferometry](https://www.spiedigitallibrary.org/conference-proceedings-of-spie/6616/66162E/Measurement-errors-of-mirrorlike-tilted-objects-in-white-light-interferometry/10.1117/12.726142.full)

# [Pattern] Transparent objects
> Search: https://patents.google.com/?q=3D+structured+light&q=+transparent+objects
## 1. [Model and method for producing photorealistic 3d models
](https://patents.google.com/patent/EP2828834B1/en?q=3D+structured+light&q=+transparent+objects)
> - EP2828834B1 2019-11-06 FITTINGBOX
> - Method for modelling a three-dimensional object, said object possibly comprising transparent or reflective portions, from two-dimensional views of this object
## 2. [Method and device for encoding three-dimensional scenes which include transparent objects in a holographic system](https://patents.google.com/patent/TWI640850B/en?q=3D+structured+light&q=+transparent+objects)
> - TWI640850B 2018-11-11 恩里科 茲裘尼爾斯 飛佛
> - A method for calculating a code for reconstructing a three-dimensional scene that includes an object 300 that partially absorbs light or sound. The method can be implemented in a computing unit.

## 3. [Device and method of three-dimensional optic measurement of strongly reflecting or transparent objects
](https://patents.google.com/patent/RU2495371C2/en)
> - RU2495371C2 2013-10-10 ДавидНАБСКайГЕНЗЕККЕ
> - Three-dimensional object measurement device.
> - Infrared radiation source for projection.
> - The projected pattern manifests itself as on the object in the form of heating distribution.
> - Camera device for taking pictures of heating distribution.

# [HDR]
## 1.3D reconstruction of specular surface via a novel structured light approach
https://ieeexplore.ieee.org/document/7279344
> 1. gray code
> 2. With different exposure levels.
> 3. Same pattern are fused together to create a new radiance map
> 4. Fused image sequence is used to adjust it to get the refined HDR structured light images. Finally, the fused HDR image sequence is decoded to reconstruct the reflective surface.
## 2. Enhancing structured light range imaging by adaptation of color, exposure and focus
https://ieeexplore.ieee.org/document/7995312
>1. time-multiplexed pseudo-color channels. (a) Red, (b) green and (c) blue channels
>2. Variable Exposure Fusion
>3. Dynamic Focus Fusion

# [Polarization imaging]
## 1. [Active lighting applied to three-dimensional reconstruction of specular metallic surfaces by polarization imaging](https://patents.google.com/scholar/9082965877921775957?oq=structured+light+High+reflectivity)
https://hal.archives-ouvertes.fr/hal-00514527/file/morel06.pdf

## 2. Rapid Acquisition of Specular and Diffuse Normal Maps from Polarized Spherical Gradient Illumination
https://vgl.ict.usc.edu/Data/3DRFE/EGSR2007_SGI_low.pdf

# [Other]
## 1. Reflectivity map estimate from dot based structured light systems
https://patents.google.com/patent/US9947099B2/en?oq=structured+light+High+reflectivity
https://patents.google.com/patent/US9947099B2/en?oq=structured+light+High+reflectivity

## 2. A Variational Study on BRDF Reconstruction in a Structured Light Scanner
https://ieeexplore.ieee.org/document/8265235
> 雙向反射分布函數（bidirectional reflectance distribution function、BRDF）

## 3. A theory of refractive and specular 3D shape by light-path triangulation
https://ieeexplore.ieee.org/document/1544889
> light path design by triangulation

# [抗反光產品] 外接於鏡頭前濾鏡(適用於高反光件)
* [POLARIZING FILTERS](https://midopt.com/filters/polarizing/)

# [圖書館]
### 不錯的資料
- [overview](https://tel.archives-ouvertes.fr/file/index/docid/584061/filename/these_A_EREN_Gonen_2010.pdf)
- Most of the three-dimensional acquisition techniques that have been developed over the past two decades have focused on opaque objects with lambertian reflectance properties. A wide range of methods has been proposed, which can be coarsely divided into active and passive range sensing.

-[High-speed 3D shape measurement with structured light methods: A review
](https://www.sciencedirect.com/science/article/pii/S0143816617313246)

* https://www.osapublishing.org/aop/fulltext.cfm?uri=aop-3-2-128&id=211561

* [State-of-The-Art and Applications of 3D Imaging Sensors in Industry, Cultural Heritage, Medicine, and Criminal Investigation
](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3280764/)

* [Optical MEMS devices for compact 3D surface imaging cameras
](https://mnsl-journal.springeropen.com/articles/10.1186/s40486-019-0087-4)

* [CVFX Lecture 24: Structured light scanning
](https://www.youtube.com/watch?v=ZC7CIlAVkIA&ab_channel=RichRadke)

# [當你覺得壓力很大的時候]