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1. 发明申请

US20220301102A1 Method and system for correcting a distorted input image 有权
公开(公告)号：US20220301102A1
公开(公告)日：2022-09-22
申请号：US17833812
申请日：2022-06-06
申请人： FotoNation Limited
发明人： Piotr Stec , Vlad Georgescu
IPC分类号： G06T3/40 , G06T5/00
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.

2. 发明授权

US11223764B2 Method for determining bias in an inertial measurement unit of an image acquisition device 有权
公开(公告)号：US11223764B2
公开(公告)日：2022-01-11
申请号：US17000698
申请日：2020-08-24
申请人： FotoNation Limited
发明人： Piotr Stec
IPC分类号： H04N5/232 , G01C25/00 , G06T7/20
摘要： A method for determining bias in an inertial measurement unit of an image acquisition device comprises mapping at least one reference point within an image frame into a 3D spherical space based on a lens projection model for the image acquisition device to provide a respective anchor point in 3D space for each reference point. For reference points within a given image frame, an estimate of frame-to-frame motion at the reference point between the given frame and a previously acquired frame is obtained; a measure of device orientation for an acquisition time of the reference point in the given frame and the previously acquired frame, the measure including a bias component, is obtained from the inertial measurement unit; a corresponding anchor point is projected in 3D space according to a difference in the measure of device orientation in the given frame and the previously acquired frame to provide a 3D vector Vm; a result of the estimated frame-to-frame motion for the point from the given frame is projected into the previously acquired frame into 3D space to provide a 3D vector Ve; and a cross product Vc of the 3D vectors Vm and Ve is used to update a bias component value.

3. 发明授权

US11046327B2 System for performing eye detection and/or tracking 有权
公开(公告)号：US11046327B2
公开(公告)日：2021-06-29
申请号：US16719686
申请日：2019-12-18
申请人： FotoNation Limited
发明人： Piotr Stec , Petronel Bigioi
IPC分类号： B60W40/09 , G06T7/73 , B60Q3/18 , B60R11/04 , G06F3/01 , G06K9/00 , B60R11/00 , B60W40/08
摘要： This disclosure describes, in part, systems and techniques for performing eye tracking. For instance, a system may include a first imaging device that generates first image data. The system may then analyze the first image data to determine a location of a face of a user. Using the location, the system may cause an actuator to move from a first position to a second position in order to direct a second imaging device towards the face of the user. While in the second position, the second imaging device may generate second image data representing at least the face of the user. The system may then analyze the second image data to determine a gaze direction of the user. In some instances, the first imaging device may include a first field of view (FOV) that is greater than a second FOV of the second imaging device.

4. 发明申请

US20210088803A1 Method for stabilizing a camera frame of a video sequence 有权
公开(公告)号：US20210088803A1
公开(公告)日：2021-03-25
申请号：US16575748
申请日：2019-09-19
申请人： FotoNation Limited
发明人： Brian O'Sullivan , Piotr Stec
IPC分类号： G02B27/64 , H04N5/232
摘要： A method for stabilizing a video sequence comprises: obtaining an indication of camera movement from acquisition of a previous camera frame to acquisition of a current camera frame; determining an orientation for the camera at a time of acquiring the current camera frame; and determining a candidate orientation for a crop frame for the current camera frame by adjusting an orientation of a crop frame associated with the previous camera frame according to the determined orientation. A boundary of one of the camera frame or crop frame is traversed to determine if a specific point on the boundary of the crop frame exceeds a boundary of the camera frame. If so, a rotation of the specific point location which would bring the specific point location onto the boundary of the crop frame is determined and the candidate crop frame orientation updated accordingly before the crop frame is displayed.

5. 发明授权

US10742904B2 Multispectral image processing system for face detection 有权
公开(公告)号：US10742904B2
公开(公告)日：2020-08-11
申请号：US15990519
申请日：2018-05-25
申请人： FotoNation Limited
发明人： Piotr Stec , Petronel Bigioi
IPC分类号： H04N5/33 , G06K9/00 , G06K9/20 , H04N5/225 , H04N5/353
摘要： An image processing system comprises at least one image sensor comprising a plurality of sub-pixels, and configured to provide a first image plane from a group of first sub-pixels selectively sensitive to a first NIR light band and a second image plane from a group of second sub-pixels selectively sensitive to a second NIR light band. An NIR light source is capable of separately emitting first NIR light corresponding to the first NIR light band and second NIR light corresponding to the second NIR light band. The system can be configured to operate according to at least a first working mode where a face detector is configured to detect at least a first face in the first image plane and a second face in the second image plane at a spatially non-coincident location to the first face.

6. 发明授权

US12142010B2 Method for calibrating a vehicle cabin camera 有权
公开(公告)号：US12142010B2
公开(公告)日：2024-11-12
申请号：US18087938
申请日：2022-12-23
申请人： FotoNation Limited
发明人： Petronel Bigioi , Piotr Stec
IPC分类号： G06T7/80 , B60R1/12 , B60R11/00 , B60R11/04 , G06T7/13
CPC分类号： G06T7/80 , B60R1/12 , B60R11/04 , G06T7/13 , B60R2001/1253 , B60R2011/0033 , G06T2207/30268
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.

7. 发明授权

US11902671B2 Vehicle occupant monitoring system including an image acquisition device with a rolling shutter image sensor 有权
公开(公告)号：US11902671B2
公开(公告)日：2024-02-13
申请号：US17547103
申请日：2021-12-09
申请人： FotoNation Limited
发明人： Istvan Andorko , Petronel Bigioi , Piotr Stec
IPC分类号： H04N23/74 , H04N25/42 , G06V10/25 , G06V40/16 , B60R11/04
CPC分类号： H04N23/74 , B60R11/04 , G06V10/25 , G06V40/16 , H04N25/42
摘要： A vehicle occupant monitoring system, OMS, comprises: an image acquisition device comprising an image sensor and a lens assembly having a varying transmissivity across a field of view of the image sensor; at least one infra-red, IR, light source disposed within a cabin of the vehicle and being configured to illuminate at least one occupant of the vehicle with varying illumination across the field of view of the image sensor; and an image processing pipeline configured to obtain and pre-process an image acquired from the image sensor in accordance with a lens shading map and a cabin illumination map in order to compensate for both the varying transmissivity and the varying illumination in order to provide a more uniformly illuminated image to a controller for further analysis.

8. 发明申请

US20230127692A1 Method For Calibrating A Vehicle Cabin Camera 有权
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
IPC分类号： G06T7/80 , G06T7/13 , B60R1/12 , B60R11/04
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.

9. 发明授权

US11593913B2 Method and system for correcting a distorted input image 有权
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
IPC分类号： G06T3/40 , G06T5/00
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.

10. 发明授权

US11538192B1 Method for calibrating a vehicle cabin camera 有权
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
IPC分类号： G06T7/80 , G06T7/13 , B60R1/12 , B60R11/04 , B60R11/00
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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