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    TAGGING CLIPPED PIXELS FOR PYRAMID PROCESSING IN IMAGE SIGNAL PROCESSOR
    12.
    发明申请
    TAGGING CLIPPED PIXELS FOR PYRAMID PROCESSING IN IMAGE SIGNAL PROCESSOR 审中-公开

    公开(公告)号：US20200334787A1

    公开(公告)日：2020-10-22

    申请号：US16391224

    申请日：2019-04-22

    Applicant: Apple Inc.

    Inventor： Maxim Smirnov ,  Elena Lamburn ,  Oren Kerem ,  Chihsin Wu

    IPC: G06T3/40 ,  G06T3/00 ,  G06T5/30 ,  G06T5/00 ,  G06T5/50

    Abstract: A portable electronic device may include an image signal processor that includes a clipping circuit, a pyramid generator circuit, and an image fusion processor. The clipping circuit clips pixel values that are under-exposed or over-exposed. The pyramid generator circuit applies a filter to the pixels of the image to generate a filtered image. Some of the filtered pixels may be generated from one or more clipped pixel values. The pyramid generator circuit identifies those filtered pixels that are generated from one or more clipped pixel values and marks the identified filtered pixels with a tag. The pyramid generator circuit decimates the filtered image to generate a downscaled image, which may include one or more filtered pixels that are marked with the tags. The image fusion processor fuses the downscaled image with another image. The pixels that are marked with the tags may be disregarded in the fusion process.

    HIGH DYNAMIC RANGE COLOR CONVERSION USING SELECTIVE INTERPOLATION
    13.
    发明申请
    HIGH DYNAMIC RANGE COLOR CONVERSION USING SELECTIVE INTERPOLATION 审中-公开

    公开(公告)号：US20200314289A1

    公开(公告)日：2020-10-01

    申请号：US16364049

    申请日：2019-03-25

    Applicant: Apple Inc.

    Inventor： Chihsin Wu ,  David R. Pope

    IPC: H04N1/60 ,  G06T3/40 ,  G06T5/00 ,  H04N5/365 ,  H04N9/73

    Abstract: Embodiments relate to circuitry for pixel conversion of images for display. A circuit converts input pixel values of an image using a color conversion function. A lookup table memory circuit stores a mapping of color converted values and input pixel values where the mapping represents the color conversion function. The circuit produces a color converted value from the lookup table as a color converted version of a first input pixel value responsive to the first input pixel value being within a first range. The circuit may also produce a color converted version of a second input pixel value by interpolating a subset of the color converted values received from the lookup table responsive to the second input pixel being within a second input range.

    Circuit for combined down sampling and correction of image data
    15.
    发明授权
    Circuit for combined down sampling and correction of image data 有权

    公开(公告)号：US11763421B2

    公开(公告)日：2023-09-19

    申请号：US17143995

    申请日：2021-01-07

    Applicant: Apple Inc.

    Inventor： Chihsin Wu ,  David R. Pope ,  Sheng Lin ,  Amnon D. Silverstein

    IPC: G06T3/40 ,  H04N23/88

    CPC classification number: G06T3/4007 ,  H04N23/88

    Abstract: A foveated down sampling and correction (FDS-C) circuit for combined down sampling and correction of chromatic aberrations in images. The FDS-C circuit performs down sampling and interpolation of pixel values of a first subset of pixels of a color in a raw image using down sampling scale factors and first interpolation coefficients to generate first corrected pixel values for pixels of the color in a first corrected version of the raw image. The FDS-C circuit further performs interpolation of pixel values of a second subset of the pixels in the first corrected version using second interpolation coefficients to generate second corrected pixel values for pixels of the color in a second corrected version of the raw image. Pixels in the first subset are arranged in a first direction, pixels in the second subset are arranged in a second direction, and the down sampling scale factors vary along the first direction.

    Hue preservation post processing with early exit for highlight recovery
    16.
    发明授权
    Hue preservation post processing with early exit for highlight recovery 有权

    公开(公告)号：US11620738B2

    公开(公告)日：2023-04-04

    申请号：US17373362

    申请日：2021-07-12

    Applicant: Apple Inc.

    Inventor： Touraj Tajbakhsh ,  Chihsin Wu ,  Frederic Cao

    IPC: G06T5/00 ,  H04N9/64 ,  G06T7/90

    Abstract: Embodiments relate to hue preservation post processing for highlight recovery of an input image. Intensity values for multiple color channels of a plurality of color channels of a pixel of the input image is determined using corresponding ratios of target hues for the plurality of color channels of the pixel, wherein the pixel has at least one color channel with an intensity above a predetermined threshold. A hue preserved value for a color channel of the plurality of color channels of the pixel is determined using intensity values determined for the plurality of color channels of the pixel and the target hues. A recovered version of the input image is generated by adjusting hue information of the pixel, using the hue preserved value for the channel of the plurality of color channels of the pixel.

    Lens shading correction for quadra image sensors
    17.
    发明授权
    Lens shading correction for quadra image sensors 有权

    公开(公告)号：US11617026B1

    公开(公告)日：2023-03-28

    申请号：US17592327

    申请日：2022-02-03

    Applicant: Apple Inc.

    Inventor： Chihsin Wu ,  David R Pope ,  Sheng Lin

    IPC: H04N25/611 ,  H04N23/76 ,  H04N23/84

    Abstract: Embodiments relate to processing of pixels captured by a quadra image sensor. A quadra image sensor includes a plurality of pixel tiles, each having a plurality of pixels corresponding to the same color. A lens shading correction (LSC) circuit receives, for each of a plurality of colors, a set of gain tables. Each gain table corresponds to a different channel associated with the color. Each gain table includes a set of gain values, each associated with a location. The LSC circuit determines a pixel gain value for each pixel in a pixel tile and scales the pixels in the pixel tile based on the determined pixel gain values.

    High dynamic range color conversion using selective interpolation for different curves
    19.
    发明授权
    High dynamic range color conversion using selective interpolation for different curves 有权

    公开(公告)号：US11252299B1

    公开(公告)日：2022-02-15

    申请号：US17176793

    申请日：2021-02-16

    Applicant: Apple Inc.

    Inventor： Chihsin Wu ,  David R. Pope

    IPC: H04N1/60

    Abstract: Embodiments relate to pixel conversion of images for display. A circuit converts input pixel values of an image using a color conversion function. The circuit is operable in different modes where each mode uses a different color conversion function. A lookup table memory circuit stores a mapping of color converted values and input pixel values according to the mode of operation where the mapping represents the color conversion function associated with the mode. The circuit produces a color converted value from the lookup table as a color converted version of a first input pixel value responsive to the first input pixel value being within a first range. The circuit may also produce a color converted version of a second input pixel value by interpolating a subset of the color converted values received from the lookup table responsive to the second input pixel being within a second input range.

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