Method for calibrating a photodetector array, a calibration device, and an associated imaging system

    公开(公告)号:US11557063B2

    公开(公告)日:2023-01-17

    申请号:US17645868

    申请日:2021-12-23

    发明人: Yves Michels

    摘要: A method for calibrating a photodetector array supplying a video stream includes: a determination step, wherein an offset table is determined for each current image of the video stream based on at least two corrections from among the following: a first correction from a comparison of the current image to a corresponding predetermined reference table; a second correction from a calculation of a column error of the current image; and a third correction from a high-pass temporal filtering of the video stream; and a calculation step, wherein a current value of an offset table, equal to a sum between a previous value of the offset table and a weighted sum of at least two corrections, is calculated, with each coefficient of the offset table being associated with a respective photodetector of the array.

    PROCESSING CIRCUITRY FOR PROCESSING DATA FROM SENSOR INCLUDING ABNORMAL PIXELS

    公开(公告)号:US20220408041A1

    公开(公告)日:2022-12-22

    申请号:US17894750

    申请日:2022-08-24

    发明人: Wonseok LEE

    IPC分类号: H04N5/367

    摘要: Processing circuitry may be configured to detect an abnormal pixel among a plurality of pixels based on pixel values of the plurality of pixels and one or more reference pixel values corresponding to the plurality of values; generate first encoded data by encoding pixel data of the plurality of pixels based on the pixel values with a first encoder; generate second encoded data by encoding the pixel data based on remaining pixels of the plurality of pixels excluding the detected abnormal pixel with a second encoder; and output the first encoded data or the second encoded data based on detecting the abnormal pixel.

    Imaging device blemish detection structures and techniques

    公开(公告)号:US11483501B1

    公开(公告)日:2022-10-25

    申请号:US17139938

    申请日:2020-12-31

    申请人: Zoox, Inc.

    IPC分类号: H04N5/367 H04N5/217 G06T5/00

    摘要: A blemish detection and characterization system and techniques for an optical imaging device includes determining a ratio of the light intensity of the image lost to the blemish relative to an expected light intensity of the image without the blemish. The system and technique may include receiving an image, transforming an image into a processed image with transformations and filters, as well as determining a relative magnitude of an intensity of a portion of the processed image relative to another area of the image. The system and technique may include taking an action based on the relative magnitude including rejecting a sensor, reworking the sensor, cleaning the sensor, or providing information about the blemish to a system to use in weighing data collected from the sensor.

    RADIATION IMAGING APPARATUS
    6.
    发明申请

    公开(公告)号:US20220317319A1

    公开(公告)日:2022-10-06

    申请号:US17808170

    申请日:2022-06-22

    IPC分类号: G01T1/20 H04N5/367

    摘要: A radiation imaging apparatus includes pixels arranged to form pixel rows and pixel columns. The pixels include first pixels and second pixels whose sensitivity to radiation is lower than the first pixels. The apparatus further includes a signal lines arranged to correspond to the pixel columns, a readout circuit configured to read out a signal from the pixels via the signal lines, and a processing unit configured to decide a correction value using signals read out from the second pixels and correct signals read out from the first pixels using the correction value. An internal structure of the readout circuit has a period. The second pixels are arranged such that there are two or more types of remainders of column numbers of pixel columns that include the second pixels divided by the period.

    Processing circuitry for processing data from sensor including abnormal pixels

    公开(公告)号:US11445136B2

    公开(公告)日:2022-09-13

    申请号:US16590896

    申请日:2019-10-02

    发明人: Wonseok Lee

    IPC分类号: H04N5/367

    摘要: Processing circuitry may be configured to detect an abnormal pixel among a plurality of pixels based on pixel values of the plurality of pixels and one or more reference pixel values corresponding to the plurality of values; generate first encoded data by encoding pixel data of the plurality of pixels based on the pixel values with a first encoder; generate second encoded data by encoding the pixel data based on remaining pixels of the plurality of pixels excluding the detected abnormal pixel with a second encoder; and output the first encoded data or the second encoded data based on detecting the abnormal pixel.

    METHOD FOR CALIBRATING A PHOTODETECTOR ARRAY, A CALIBRATION DEVICE, AND AN ASSOCIATED IMAGING SYSTEM

    公开(公告)号:US20220207775A1

    公开(公告)日:2022-06-30

    申请号:US17645868

    申请日:2021-12-23

    发明人: Yves MICHELS

    摘要: A method for calibrating a photodetector array supplying a video stream includes: a determination step, wherein an offset table is determined for each current image of the video stream based on at least two corrections from among the following: a first correction from a comparison of the current image to a corresponding predetermined reference table; a second correction from a calculation of a column error of the current image; and a third correction from a high-pass temporal filtering of the video stream; and a calculation step, wherein a current value of an offset table, equal to a sum between a previous value of the offset table and a weighted sum of at least two corrections, is calculated, with each coefficient of the offset table being associated with a respective photodetector of the array.

    Pixel correction
    10.
    发明授权

    公开(公告)号:US11228723B2

    公开(公告)日:2022-01-18

    申请号:US16791001

    申请日:2020-02-14

    申请人: Apical Limited

    摘要: A method and apparatus for image processing, the method comprising obtaining input image data comprising a plurality of pixel intensity values representing a respective plurality of pixel locations, obtaining pixel location data identifying one or more pixel locations represented by compromised pixel intensity values, generating interpolated image data comprising improved pixel intensity values, storing improved image data comprising at least the interpolated image data, and detecting one or more further compromised pixel intensity values based on the improved image data.