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公开(公告)号：US20230127692A1
公开(公告)日：2023-04-27
申请号：US18087938
申请日：2022-12-23
申请人： FotoNation Limited
发明人： Petronel Bigioi , Piotr Stec
摘要： A method for calibrating a vehicle cabin camera having: a pitch, yaw and roll angle; and a field of view capturing vehicle cabin features which are symmetric about a vehicle longitudinal axis comprises: selecting points from within an image of the vehicle cabin and projecting the points onto a 3D unit circle in accordance with a camera projection model. For each of one or more rotations of a set of candidate yaw and roll rotations, the method comprises: rotating the projected points with the rotation; flipping the rotated points about a pitch axis; counter-rotating the projected points with an inverse of the rotation; and mapping the counter-rotated points back into an image plane to provide a set of transformed points. A candidate rotation which provides a best match between the set of transformed points and the locations of the selected points in the image plane is selected.
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公开(公告)号：US11593913B2
公开(公告)日：2023-02-28
申请号：US17833812
申请日：2022-06-06
申请人： FotoNation Limited
发明人： Piotr Stec , Vlad Georgescu
摘要： A method for correcting an image divides an output image into a grid with vertical sections of width smaller than the image width but wide enough to allow efficient bursts when writing distortion corrected line sections into memory. A distortion correction engine includes a relatively small amount of memory for an input image buffer but without requiring unduly complex control. The input image buffer accommodates enough lines of an input image to cover the distortion of a single most vertically distorted line section of the input image. The memory required for the input image buffer can be significantly less than would be required to store all the lines of a distorted input image spanning a maximal distortion of a complete line within the input image.
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公开(公告)号：US11538192B1
公开(公告)日：2022-12-27
申请号：US17398965
申请日：2021-08-10
申请人： FotoNation Limited
发明人： Piotr Stec , Petronel Bigioi
摘要： A method for calibrating a vehicle cabin camera having: a pitch, yaw and roll angle; and a field of view capturing vehicle cabin features which are symmetric about a vehicle longitudinal axis comprises: selecting points from within an image of the vehicle cabin and projecting the points onto a 3D unit circle in accordance with a camera projection model. For each of one or more rotations of a set of candidate yaw and roll rotations, the method comprises: rotating the projected points with the rotation; flipping the rotated points about a pitch axis; counter-rotating the projected points with an inverse of the rotation; and mapping the counter-rotated points back into an image plane to provide a set of transformed points. A candidate rotation which provides a best match between the set of transformed points and the locations of the selected points in the image plane is selected.
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公开(公告)号：US20220254105A1
公开(公告)日：2022-08-11
申请号：US17652078
申请日：2022-02-22
申请人： FotoNation Limited
发明人： Kartik Venkataraman
摘要： In an embodiment, a 3D facial modeling system includes a plurality of cameras configured to capture images from different viewpoints, a processor, and a memory containing a 3D facial modeling application and parameters defining a face detector, wherein the 3D facial modeling application directs the processor to obtain a plurality of images of a face captured from different viewpoints using the plurality of cameras, locate a face within each of the plurality of images using the face detector, wherein the face detector labels key feature points on the located face within each of the plurality of images, determine disparity between corresponding key feature points of located faces within the plurality of images, and generate a 3D model of the face using the depth of the key feature points.
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公开(公告)号：US11412158B2
公开(公告)日：2022-08-09
申请号：US16907016
申请日：2020-06-19
申请人： FotoNation Limited
发明人： Kartik Venkataraman , Amandeep S. Jabbi , Robert H. Mullis , Jacques Duparre , Shane Ching-Feng Hu
IPC分类号： H04N5/262 , H04N5/225 , H04N5/247 , G02B13/00 , G02B5/20 , H04N5/365 , H04N13/128 , H04N5/232 , H04N5/33 , H04N5/341 , H04N5/349 , H04N5/355 , H04N5/357 , G06T7/557 , H04N13/239 , G06T7/50 , H04N9/097 , G06T19/20 , H04N9/09 , H04N9/73 , H04N5/265 , G06T11/60 , G02B3/00 , H04N13/257 , H04N9/04 , H04N13/00
摘要： Systems and methods for implementing array cameras configured to perform super-resolution processing to generate higher resolution super-resolved images using a plurality of captured images and lens stack arrays that can be utilized in array cameras are disclosed. An imaging device in accordance with one embodiment of the invention includes at least one imager array, and each imager in the array comprises a plurality of light sensing elements and a lens stack including at least one lens surface, where the lens stack is configured to form an image on the light sensing elements, control circuitry configured to capture images formed on the light sensing elements of each of the imagers, and a super-resolution processing module configured to generate at least one higher resolution super-resolved image using a plurality of the captured images.
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公开(公告)号：US11405580B2
公开(公告)日：2022-08-02
申请号：US17016133
申请日：2020-09-09
申请人： FotoNation Limited
发明人： Lorant Bartha , Corneliu Zaharia , Vlad Georgescu , Joe Lemley
摘要： A method of producing an image frame from event packets received from an event camera comprises: forming a tile buffer sized to accumulate event information for a subset of image tiles, the tile buffer having an associated tile table that determines a mapping between each tile of the image frame for which event information is accumulated in the tile buffer and the image frame. For each event packet: an image tile corresponding to the pixel location of the event packet is identified; responsive to the tile buffer storing information for one other event corresponding to the image tile, event information is added to the tile buffer; and responsive to the tile buffer not storing information for another event corresponding to the image tile and responsive to the tile buffer being capable of accumulating event information for at least one more tile, the image tile is added to the tile buffer.
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公开(公告)号：US11361525B2
公开(公告)日：2022-06-14
申请号：US16882918
申请日：2020-05-26
申请人： FotoNation Limited
发明人： Istvan Andorko , Petronel Bigioi
摘要： This disclosure describes, in part, devices and techniques for performing biometric identification for an electronic device. For instance, the electronic device may include one or more near-infrared illuminators that output near-infrared light. The one or more near-infrared illuminators may be located in or on a bezel and/or a display of the electronic device. The electronic device may also include an imaging device that generates first image data representing the near-infrared light and visible light. After generating the image data, the electronic device may process the first image data using one or more image processing techniques to generate second image data representing a near-infrared image and third image data representing a visible image. The electronic device may then analyze the second image data and/or the third image data using one or more biometric identification techniques. Based on the analysis, the electronic device may identify a person possessing the electronic device.
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公开(公告)号：US11270137B2
公开(公告)日：2022-03-08
申请号：US17037420
申请日：2020-09-29
申请人： FotoNation Limited
发明人： Amr Elrasad , Cian Ryan , Richard Blythman , Joe Lemley , Brian O'Sullivan
摘要： A method for producing a textural image from event information generated by an event camera comprises: accumulating event information from a plurality of events occurring during successive event cycles across a field of view of the event camera, each event indicating an x,y location within the field of view, a polarity for a change of detected light intensity incident at the x,y location and an event cycle at which the event occurred; in response to selected event cycles, analysing event information for one or more preceding event cycles to identify one or more regions of interest bounding a respective object to be tracked; and responsive to a threshold event criterion for a region of interest being met, generating a textural image for the region of interest from event information accumulated from within the region of interest.
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公开(公告)号：US11257192B2
公开(公告)日：2022-02-22
申请号：US16724877
申请日：2019-12-23
申请人： FotoNation Limited
发明人： Piotr Stec
摘要： A method of correcting an image obtained by an image acquisition device includes obtaining successive measurements, Gn, of device movement during exposure of each row of an image. An integration range, idx, is selected in proportion to an exposure time, te, for each row of the image. Accumulated measurements, Cn, of device movement for each row of an image are averaged across the integration range to provide successive filtered measurements, G, of device movement during exposure of each row of an image. The image is corrected for device movement using the filtered measurements G.
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公开(公告)号：US11209633B2
公开(公告)日：2021-12-28
申请号：US15973359
申请日：2018-05-07
申请人： FotoNation Limited
摘要： An iris image acquisition system for a mobile device, comprises a lens assembly arranged along an optical axis and configured for forming an image comprising at least one iris of a subject disposed frontally to the lens assembly; and an image sensor configured to acquire the formed image. The lens assembly comprises a first lens refractive element and at least one second lens element for converging incident radiation to the first refractive element. The first refractive element has a variable thickness configured to counteract a shift of the formed image along the optical axis induced by change in iris-lens assembly distance, such that different areas of the image sensor on which irises at different respective iris-lens assembly distances are formed are in focus within a range of respective iris-lens assembly distances at which iris detail is provided at sufficient contrast to be recognised.
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