Optical design of a multi-channel, multi-resolution imaging system

Belay, Gebirie Yizengaw; Meuret, Youri; Ottevaere, Heidi; Thienpont, Hugo

doi:10.1117/12.922315

Cited by 3 publications

(3 citation statements)

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“…The magnification and/or resolution and their ratio between the channels were also calculated. The ratio of magnification of the first channel to the second channel is approximately 3 and the ratio of magnification of the second channel to the third channel is about 2; consequently, the magnification ratio between the first channel and the third channel which is about 6 and is comparable to the ratio of the respective entrance pupil diameters in the simulation 12,13 . The magnification ratios and the FOVs of the channels prove that there is a clear correspondence between the properties of the simulated and demonstrated system (see Table 1).…”

Section: Experimementioning

confidence: 83%

“…Our goal in this work, as a significant diversion compared to the aforementioned methods, however was that to design an imaging system which comprises multiple optical channels that have different imaging properties (focal length, FOV, angular resolution) 12,13 . Thus, on the image sensor of such a system a high resolution, narrow FOV image and low resolution, wide FOV image could be obtained on different regions of an image sensor.…”

Section: Introductionmentioning

confidence: 99%

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Proof-of-concept demonstration of a miniaturized three-channel multiresolution imaging system

et al. 2014

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Multichannel imaging systems have several potential applications such as multimedia, surveillance, medical imaging and machine vision, and have therefore been a hot research topic in recent years. Such imaging systems, inspired by natural compound eyes, have many channels, each covering only a portion of the total field-of-view of the system. As a result, these systems provide a wide field-of-view (FOV) while having a small volume and a low weight. Different approaches have been employed to realize a multichannel imaging system. We demonstrated that the different channels of the imaging system can be designed in such a way that they can have each different imaging properties (angular resolution, FOV, focal length). Using optical ray-tracing software (CODE V), we have designed a miniaturized multiresolution imaging system that contains three channels each consisting of four aspherical lens surfaces fabricated from PMMA material through ultra-precision diamond tooling. The first channel possesses the largest angular resolution (0.0096°) and narrowest FOV (7°), whereas the third channel has the widest FOV (80°) and the smallest angular resolution (0.078°). The second channel has intermediate properties. Such a multiresolution capability allows different image processing algorithms to be implemented on the different segments of an image sensor. This paper presents the experimental proofof-concept demonstration of the imaging system using a commercial CMOS sensor and gives an in-depth analysis of the obtained results. Experimental images captured with the three channels are compared with the corresponding simulated images. The experimental MTF of the channels have also been calculated from the captured images of a slanted edge target test. This multichannel multiresolution approach opens the opportunity for low-cost compact imaging systems that can be equipped with smart imaging capabilities.

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Section: Experimementioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Proof-of-concept demonstration of a miniaturized three-channel multiresolution imaging system

et al. 2014

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“…The chromatic aberration caused by the longitudinal/axial defocus of the different wavelengths is called longitudinal chromatic aberration. On the other hand, the chromatic aberration caused by the lateral shift of an off-axis image point, from its paraxial position, for different wavelengths is called lateral chromatic aberration 13,14 . Chromatic aberrations can be compensated by hybrid lenses, which contain diffractive structures on top of the refractive surfaces 15 , so that the overall system remains lightweight and compact.…”

Section: Design Of the Imaging System With Hybrid Lensesmentioning

confidence: 99%

Photonics-enhanced smart imaging systems

Ottevaere

Belay

Thienpont

2016

Applications of Digital Image Processing XXXIX

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We discuss different photonics-enhanced multichannel multiresolution imaging systems in which the different channels have different imaging properties, namely a different FOV and angular resolution, over different areas of an image sensor. This could allow different image processing algorithms to be implemented to process the different images. A basic threechannel multiresolution imaging system was designed at 587.6 nm where each of the three channels consist of four aspherical lens surfaces. These lenses have been fabricated in PMMA through ultra-precision diamond tooling and afterwards assembled with aperture stops, baffles and a commercial CMOS sensor. To reduce the influence of chromatic aberrations, hybrid lenses, which contain diffractive surfaces on top of refractive ones, have been included within the previous designs of the three channels. These hybrid lenses have also been fabricated through ultra-precision diamond tooling, assembled and verified in an experimental demonstration. The three channels with hybrid lenses show better image quality (both in the simulation and experiment) compared to the purely refractive three channel design. Because of a limited depth of field of the aforementioned multichannel multiresolution imaging systems, a voltage tunable lens has been integrated in the first channel to extend the depth of field of the overall system. The refocusing capability has significantly improved the depth of field of the system and ranged from 0.25 m to infinity compared to 9 m to infinity for the aforementioned basic three-channel multiresolution imaging system.

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Application of multi-channel optical imaging automatic classification in outdoor scene environment design

Suhui,

Jounghyung,

et al. 2024

Opt Quant Electron

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Optical design of a multi-channel, multi-resolution imaging system

Cited by 3 publications

References 0 publications

Proof-of-concept demonstration of a miniaturized three-channel multiresolution imaging system

Proof-of-concept demonstration of a miniaturized three-channel multiresolution imaging system

Photonics-enhanced smart imaging systems

Application of multi-channel optical imaging automatic classification in outdoor scene environment design

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