2022
DOI: 10.1186/s43593-022-00021-3
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To image, or not to image: class-specific diffractive cameras with all-optical erasure of undesired objects

Abstract: Privacy protection is a growing concern in the digital era, with machine vision techniques widely used throughout public and private settings. Existing methods address this growing problem by, e.g., encrypting camera images or obscuring/blurring the imaged information through digital algorithms. Here, we demonstrate a camera design that performs class-specific imaging of target objects with instantaneous all-optical erasure of other classes of objects. This diffractive camera consists of transmissive surfaces … Show more

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Cited by 59 publications
(41 citation statements)
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“…For the implementation of the broadband diffractive designs in this paper, we fixed the mean value λm of this group of wavelengths {λ1,λ2,,λNw}, i.e., λm=1Nww=1Nwλw and assigned these wavelengths to be equally spaced between λ1=0.9125λm and λNw=1.0875λm. Unless otherwise specified, we chose λm to be 0.8 mm in our numerical simulations, as it aligns with the terahertz band that was experimentally used in several of our previous works 50 , 52 , 58 , 59 , 61 , 62 , 66 , 67 . Without loss of generality, the wavelengths used for the design of the broadband diffractive processors can also be selected at other parts of the electromagnetic spectrum, such as the visible band, for which the related simulation results and analyses can be found in Sec.…”
Section: Resultsmentioning
confidence: 99%
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“…For the implementation of the broadband diffractive designs in this paper, we fixed the mean value λm of this group of wavelengths {λ1,λ2,,λNw}, i.e., λm=1Nww=1Nwλw and assigned these wavelengths to be equally spaced between λ1=0.9125λm and λNw=1.0875λm. Unless otherwise specified, we chose λm to be 0.8 mm in our numerical simulations, as it aligns with the terahertz band that was experimentally used in several of our previous works 50 , 52 , 58 , 59 , 61 , 62 , 66 , 67 . Without loss of generality, the wavelengths used for the design of the broadband diffractive processors can also be selected at other parts of the electromagnetic spectrum, such as the visible band, for which the related simulation results and analyses can be found in Sec.…”
Section: Resultsmentioning
confidence: 99%
“…To mitigate some of these practical issues, various approaches, such as high-precision lithography and antireflection coatings can be utilized in the fabrication process of a diffractive network. As demonstrated in our previous work, 50 , 52 , 61 it is also possible to mitigate the performance degradation resulting from some of these experimental factors by incorporating them as random errors into the physical forward model used during the training process, which is referred to as “vaccination” of the diffractive network.…”
Section: Discussionmentioning
confidence: 99%
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“…In a recent paper of eLight, the UCLA group introduced a new camera design by using diffractive computing 8 , which can image specific objects, such as MINST handwritten numbers, fashion items, while unwanted information was all-optically erased, as shown in Fig. 1.…”
mentioning
confidence: 99%