Design of a foveated wide-angle endoscopic lens

Dallaire, Xavier; Thibault, Simon

doi:10.1117/1.oe.55.4.047106

Opt. Eng

2016

DOI: 10.1117/1.oe.55.4.047106

|View full text |Cite

Design of a foveated wide-angle endoscopic lens

Xavier Dallaire

Simon Thibault

Abstract: Recent improvements in optics miniaturization have led to the development of multiple techniques in order to perform minimally invasive endoscopic procedures. Among them, the wide-angle lens is often used for its simplicity and ability to collect a large amount of information in one capture. We report the design and analysis of two versions of a wide-angle endoscope with a full field of view of 180 deg. The difference between the two designs resides in the direct control over distortion that was used in order … Show more

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...

Citation Types

Supporting

Mentioning

Contrasting

Year Published

2017

2021

Publication Types

Select...

Article3

Relationship

Self Cite0

Independent3

Authors

Journals

Cited by 3 publications

References 20 publications

(14 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

Compact wide-angle capsule endoscopic lens design

2020

View full text Add to dashboard Cite

Capsule endoscopes require a high-quality imaging system in terms of the wide field of view (FOV), image brightness, and resolution to provide accurate diagnostic information. However, because of the wide-angle lens design, the first element of the lens inevitably becomes larger in diameter, making it difficult to reduce the overall size of the lens. In this study, the compact wide-angle lens for a capsule endoscope is reported. The proposed system allows the first element to be compact in diameter and increases image quality by utilizing all aspheric surfaces for optical aberration control. The specification of the proposed capsule endoscope lens shows the wide FOV of 160 deg, F-number 2.8, and total track length of 5 mm. In the overall FOV, relative illumination is still over 60%. To achieve a high image quality in the proposed system, the modulation transfer function is over 30% at 180 lp/mm for a 1920 × 1080 1/6 inch CMOS image sensor in a pixel size of 1.4 µm.

show abstract

Compact wide-angle capsule endoscopic lens design

2020

View full text Add to dashboard Cite

show abstract

Low-cost dynamic real-time foveated imager

Niu

Chang

et al. 2017

Appl. Opt.

View full text Add to dashboard Cite

Foveated imaging systems have the ability to capture local high-resolution or high-magnification images with wide field of view (FOV); thus, they have great potential for applications in the field of monitoring and remote sensing of unmanned aerial vehicles. Hence, foveated optical systems are in strong demand. However, the existing foveated imaging systems either are equipped with expensive modulators or require fixing the local high resolution imaging field, which is not suitable for mass production or object tracking in industrial applications. We propose a low-cost dynamic real-time foveated imaging system for extensive use in the listed applications. Specifically, we place a microlens behind the first intermediary image plane to modulate the local focal length, constructing a local high magnification imaging channel. One two-axis translation stage drives the microlens to scan in the plane perpendicular to the optical axis, resulting in dynamic local high magnifying imaging. Furthermore, the peripheral imaging channel and the foveated imaging channel focus on the same detector, and the post image fusion is unnecessary; the system consists of only a common aspherical lens and thus is very inexpensive. The experimental system has a focal length of 25 mm, a full FOV of 30°, and an entrance pupil diameter of 5 mm, while the local high magnifying imaging channel has a focal length of 35 mm and FOV of 15°. Experiment results show that the low-cost dynamic real-time foveated imaging system performs very well.

show abstract

Wide Field-of-View, High-Resolution Endoscopic Lens Design with Low F-Number for Disposable Endoscopy

2021

View full text Add to dashboard Cite

In the past few decades, video endoscopy has become one of the primary medical devices in diverse clinical fields for examination, treatment, and early disease diagnosis of the gastrointestinal tract. For an accurate diagnosis, an endoscopic camera offering bright and wide field-of-view images is required while maintaining its compact dimensions to enter the long, narrow, and dark tract inside of the body. Recent endoscopic lenses successfully provide wide fields-of-view and have compact sizes for the system; however, their f-numbers still remain at 2.8 or higher. Therefore, further improvement in f-numbers is required to compensate for the restricted illumination system of the endoscopic probe. Here, we present a low f-number endoscopic lens design while providing wide field-of-view and high-resolution imaging. The proposed lens system achieved a low f-number of 2.2 and a field-of-view of 140 deg. The modulation transfer function (MTF) is over 20% at 180 lp/mm, and relative illumination is more than 60% in the full field. Additionally, the proposed lens is designed for a 1/4” 5-megapixel complementary metal-oxide-semiconductor (CMOS) image sensor with a pixel size of 1.4 µm. This all-plastic lens design could help develop a high-performance disposable endoscope that prevents the risk of infection or cross-contamination with mass manufacture and low cost.

show abstract

scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.

Contact Info

hi@scite.ai

10624 S. Eastern Ave., Ste. A-614

Henderson, NV 89052, USA

Blog Terms and Conditions API Terms Privacy Policy Contact Cookie Preferences Do Not Sell or Share My Personal Information

Made with 💙 for researchers

Part of the Research Solutions Family.

Design of a foveated wide-angle endoscopic lens

Cited by 3 publications

References 20 publications

Compact wide-angle capsule endoscopic lens design

Compact wide-angle capsule endoscopic lens design

Low-cost dynamic real-time foveated imager

Wide Field-of-View, High-Resolution Endoscopic Lens Design with Low F-Number for Disposable Endoscopy

Contact Info

Product

Resources

About