Patents Assigned to Foveon, Inc.
  • Patent number: 10178322
    Abstract: A method for adjusting predetermined ISO-dependent image processing parameters for images captured by a digital camera includes measuring the exposure deviation in exposure units from an optimal exposure as determined by the camera during an image capture process, deriving an estimated camera sensitivity from the exposure deviation, and adjusting the ISO-dependent image processing parameters for images captured by the camera as a function of the derived estimated camera sensitivity.
    Type: Grant
    Filed: April 13, 2016
    Date of Patent: January 8, 2019
    Assignee: Foveon, Inc.
    Inventor: Rastislav Lukac
  • Patent number: 10178328
    Abstract: A method for performing color density filtering of images captured in a digital camera having a mechanical shutter and an imaging array including a plurality of pixels each including different color sensors aligned with each other, including opening the mechanical shutter, resetting all of the color sensors in each pixel by asserting a row reset signal, separately asserting color-select signals for each color after the mechanical shutter is opened, independently starting exposure for each different color sensor at a color sensor exposure start time by de-asserting its color select signal, the exposure start time for each different color sensor being a function of a color density filter function, closing the mechanical shutter, and reading color exposure values from the color sensors by separately asserting color-select signals after the mechanical shutter has closed, the reading being unrelated to the start times for the color sensors.
    Type: Grant
    Filed: June 29, 2018
    Date of Patent: January 8, 2019
    Assignee: Foveon, Inc.
    Inventors: Shrinath Ramaswami, Glenn J. Keller
  • Publication number: 20180374240
    Abstract: A method for performing restoration for highlights and saturated regions in a digital image includes analyzing the pixels in the image and compensating an appropriate amount to identified highlights and saturated pixels. For a pixel with vertical color channels, the output for each channel is highly correlated, and each color channel can be recovered as a combination of the other channels. Each selected pixel in the highlights or saturated regions is identified as a restorable pixel only if at least two color channels of the pixel are not saturated. For each restorable pixel, a replacement pixel value is generated by using the equation derived from the color channels correlation. For pixels where more than one color channel is saturated, the similarity is calculated between these pixels and restored pixels. These pixels can be compensated using the combination of the similarity index and the pixel values of other color channels.
    Type: Application
    Filed: June 21, 2017
    Publication date: December 27, 2018
    Applicant: Foveon, Inc.
    Inventors: Jiashu Zhang, Shrinath Ramaswami, Ion Uehara
  • Publication number: 20180324372
    Abstract: A method for performing color density filtering of images captured in a digital camera having a mechanical shutter and an imaging array including a plurality of pixels each including different color sensors aligned with each other, including opening the mechanical shutter, resetting all of the color sensors in each pixel by asserting a row reset signal, separately asserting color-select signals for each color after the mechanical shutter is opened, independently starting exposure for each different color sensor at a color sensor exposure start time by de-asserting its color select signal, the exposure start time for each different color sensor being a function of a color density filter function, closing the mechanical shutter, and reading color exposure values from the color sensors by separately asserting color-select signals after the mechanical shutter has closed, the reading being unrelated to the start times for the color sensors.
    Type: Application
    Filed: June 29, 2018
    Publication date: November 8, 2018
    Applicant: Foveon, Inc.
    Inventors: Shrinath Ramaswami, Glenn J. Keller
  • Patent number: 10021320
    Abstract: In a digital camera having an imaging array including a plurality of pixels arranged in rows and columns, the digital camera having a mechanical shutter, a method for performing neutral density filtering of images captured by the imaging array, the method comprising opening the mechanical shutter, operating each row in the array by resetting all of the pixel sensors in the row, starting exposure for all of the pixel sensors in the row, closing the mechanical shutter, reading pixel values from the pixels in the array after the mechanical shutter has closed at a time unrelated to a time at which any pixel-select signal was de-asserted, and wherein the interval of time between starting exposure for all of the pixel sensors in the row and closing the mechanical shutter for each row a function of a neutral density filter function applied to an image to be captured.
    Type: Grant
    Filed: June 28, 2016
    Date of Patent: July 10, 2018
    Assignee: Foveon, Inc.
    Inventors: Shrinath Ramaswami, Glenn J. Keller
  • Publication number: 20180176497
    Abstract: In an imaging array having a plurality of pixel sensors arranged in a plurality of rows and columns, pixel data being read out on column lines of the array, a column line voltage clamp circuit for column lines of the array includes a master voltage clamp circuit coupled to provide a reference voltage clamp level on a reference node, and a slave voltage clamp circuit coupled to each column line in the imaging array, each slave voltage clamp circuit configured to clamp voltage on the column line to a column voltage clamp level derived from the reference voltage level.
    Type: Application
    Filed: April 20, 2017
    Publication date: June 21, 2018
    Applicant: Foveon, Inc.
    Inventors: Sudipta Saha, Shivani Gupta
  • Patent number: 9998677
    Abstract: A method for adjusting predetermined ISO-dependent image processing parameters for images captured by a digital camera includes measuring the exposure deviation in exposure units from an optimal exposure as determined by the camera during an image capture process, deriving an estimated camera sensitivity from the exposure deviation, and adjusting the ISO-dependent image processing parameters for images captured by the camera as a function of the derived estimated camera sensitivity.
    Type: Grant
    Filed: April 13, 2016
    Date of Patent: June 12, 2018
    Assignee: Foveon, Inc.
    Inventor: Rastislav Lukac
  • Patent number: 9942495
    Abstract: A pixel sensor array includes a plurality of pixel sensors having a first gain and a plurality of pixel sensors having a second gain less than the first gain.
    Type: Grant
    Filed: November 16, 2015
    Date of Patent: April 10, 2018
    Assignee: Foveon, Inc.
    Inventors: Rastislav Lukac, Shri Ramaswami, Sanghoon Bae
  • Publication number: 20170374302
    Abstract: In a digital camera having an imaging array including a plurality of pixels arranged in rows and columns, the digital camera having a mechanical shutter, a method for performing neutral density filtering of images captured by the imaging array, the method comprising opening the mechanical shutter, operating each row in the array by resetting all of the pixel sensors in the row, starting exposure for all of the pixel sensors in the row, closing the mechanical shutter, reading pixel values from the pixels in the array after the mechanical shutter has closed at a time unrelated to a time at which any pixel-select signal was de-asserted, and wherein the interval of time between starting exposure for all of the pixel sensors in the row and closing the mechanical shutter for each row a function of a neutral density filter function applied to an image to be captured.
    Type: Application
    Filed: June 28, 2016
    Publication date: December 28, 2017
    Applicant: Foveon, Inc.
    Inventors: Shrinath Ramaswami, Glenn J. Keller
  • Patent number: 9813632
    Abstract: A method for adjusting predetermined ISO-dependent image processing parameters for images captured by a digital camera includes measuring the exposure deviation in exposure units from an optimal exposure as determined by the camera during an image capture process, deriving an estimated camera sensitivity from the exposure deviation, and adjusting the ISO-dependent image processing parameters for images captured by the camera as a function of the derived estimated camera sensitivity.
    Type: Grant
    Filed: May 14, 2012
    Date of Patent: November 7, 2017
    Assignee: Foveon, Inc.
    Inventor: Rastislav Lukac
  • Patent number: 9530194
    Abstract: A method for performing highlight restoration on a digital image includes comparing the pixels in the image with a saturation level value to identify saturated pixels. A saturation map of saturated pixels is generated. Each selected saturated pixel is identified as a restorable pixel only if at least one color channel of the pixel is unsaturated. For each restorable pixel, a group of the closest unsaturated pixels above, below, to the left, and to the right of the select saturated pixel is identified. A replacement pixel value is generated for each saturated color channel of the restorable pixel, using a combination of the pixel values of the unsaturated color channels of the restorable pixel and the pixel values of the corresponding color channels of the nearby unsaturated pixels.
    Type: Grant
    Filed: January 30, 2014
    Date of Patent: December 27, 2016
    Assignee: Foveon, Inc.
    Inventors: Rastislav Lukac, Ken Doyle
  • Publication number: 20160234418
    Abstract: A method for adjusting predetermined ISO-dependent image processing parameters for images captured by a digital camera includes measuring the exposure deviation in exposure units from an optimal exposure as determined by the camera during an image capture process, deriving an estimated camera sensitivity from the exposure deviation, and adjusting the ISO-dependent image processing parameters for images captured by the camera as a function of the derived estimated camera sensitivity.
    Type: Application
    Filed: April 13, 2016
    Publication date: August 11, 2016
    Applicant: Foveon, Inc.
    Inventor: Rastislav Lukac
  • Publication number: 20160234419
    Abstract: A method for adjusting predetermined ISO-dependent image processing parameters for images captured by a digital camera includes measuring the exposure deviation in exposure units from an optimal exposure as determined by the camera during an image capture process, deriving an estimated camera sensitivity from the exposure deviation, and adjusting the ISO-dependent image processing parameters for images captured by the camera as a function of the derived estimated camera sensitivity.
    Type: Application
    Filed: April 13, 2016
    Publication date: August 11, 2016
    Applicant: Foveon, Inc.
    Inventor: Rastislav Lukac
  • Patent number: 9240035
    Abstract: A method for performing column/row pattern suppression in a digital input image includes creating a smoothed version of the input image by averaging a set of columns/rows neighboring around the column/row being corrected. A difference image is constructed by subtracting the smoothed image from the input image. New column/row intensities are computed from the difference image. An output image is constructed with suppressed column/row patterns by subtracting the new column/row intensities from the input image.
    Type: Grant
    Filed: March 31, 2014
    Date of Patent: January 19, 2016
    Assignee: Foveon, Inc.
    Inventors: Alireza Yasan, Lukac Rastislav
  • Patent number: 9191556
    Abstract: A pixel sensor array includes a plurality of pixel sensors having a first gain and a plurality of pixel sensors having a second gain less than the first gain.
    Type: Grant
    Filed: July 16, 2012
    Date of Patent: November 17, 2015
    Assignee: Foveon, Inc.
    Inventors: Rastislav Lukac, Shri Ramaswami, Sanghoon Bae
  • Patent number: 9147235
    Abstract: A method for performing highlight restoration on a digital image includes comparing the pixels in the image with a saturation level value to identify saturated pixels. A saturation map of saturated pixels is generated. Each selected saturated pixel is identified as a restorable pixel only if at least one color channel of the pixel is unsaturated. For each restorable pixel, a group of the closest unsaturated pixels above, below, to the left, and to the right of the select saturated pixel is identified. A replacement pixel value is generated for each saturated color channel of the restorable pixel, using a combination of the pixel values of the unsaturated color channels of the restorable pixel and the pixel values of the corresponding color channels of the nearby unsaturated pixels.
    Type: Grant
    Filed: January 30, 2014
    Date of Patent: September 29, 2015
    Assignee: Foveon, Inc.
    Inventors: Rastislav Lukac, Ken Doyle
  • Patent number: 9049334
    Abstract: A method for chroma denoising a digital image created in a digital camera includes decomposing the digital image into a plurality of spatial frequency bands. A separate modified color correction matrix is calculated from a color correction matrix associated with the camera for each of the plurality of spatial frequency bands. Each modified color correction matrix is applied to data in its corresponding spatial frequency band to produce color-corrected data in the plurality of spatial frequency bands. The color-corrected data in plurality of spatial frequency bands is combined to produce an output image.
    Type: Grant
    Filed: February 24, 2012
    Date of Patent: June 2, 2015
    Assignee: Foveon, Inc.
    Inventors: Florin Cutzu, Sumit Chawla
  • Publication number: 20140320496
    Abstract: A method for performing column/row pattern suppression in a digital input image includes creating a smoothed version of the input image by averaging a set of columns/rows neighboring around the column/row being corrected. A difference image is constructed by subtracting the smoothed image from the input image. New column/row intensities are computed from the difference image. An output image is constructed with suppressed column/row patterns by subtracting the new column/row intensities from the input image.
    Type: Application
    Filed: March 31, 2014
    Publication date: October 30, 2014
    Applicant: Foveon, Inc.
    Inventors: Alireza Yasan, Lukac Rastislav
  • Publication number: 20140321743
    Abstract: A method for performing highlight restoration on a digital image includes comparing the pixels in the image with a saturation level value to identify saturated pixels. A saturation map of saturated pixels is generated. Each selected saturated pixel is identified as a restorable pixel only if at least one color channel of the pixel is unsaturated. For each restorable pixel, a group of the closest unsaturated pixels above, below, to the left, and to the right of the select saturated pixel is identified. A replacement pixel value is generated for each saturated color channel of the restorable pixel, using a combination of the pixel values of the unsaturated color channels of the restorable pixel and the pixel values of the corresponding color channels of the nearby unsaturated pixels.
    Type: Application
    Filed: January 30, 2014
    Publication date: October 30, 2014
    Applicant: Foveon, Inc.
    Inventors: Rastislav Lukac, Ken Doyle
  • Publication number: 20140321742
    Abstract: A method for performing highlight restoration on a digital image includes comparing the pixels in the image with a saturation level value to identify saturated pixels. A saturation map of saturated pixels is generated. Each selected saturated pixel is identified as a restorable pixel only if at least one color channel of the pixel is unsaturated. For each restorable pixel, a group of the closest unsaturated pixels above, below, to the left, and to the right of the select saturated pixel is identified. A replacement pixel value is generated for each saturated color channel of the restorable pixel, using a combination of the pixel values of the unsaturated color channels of the restorable pixel and the pixel values of the corresponding color channels of the nearby unsaturated pixels.
    Type: Application
    Filed: January 30, 2014
    Publication date: October 30, 2014
    Applicant: Foveon, Inc.
    Inventors: Rastislav Lukac, Ken Doyle