Dolby Laboratories Licensing Corporation

Jon Scott Mcelvain

Robin Atkins

Gregory John Ward

Walter Christian Gish

Jaclyn Anne Pytlarz

David Ruhoff

Christopher J Vogt

David Brooks

Robert Wanat

Jonathan Robert Miller

Yuelong Li

Mohammad Tofighi

A high-dynamic-range (HDR) camera module with adaptive image data linearization includes (i) an HDR image sensor configured to generate tone-compressed HDR images as respective frames that include active pixel data and metadata, (ii) a processor outside the HDR image sensor, and (iii) a memory outside the HDR image sensor and storing machine-readable instructions that, when executed by the processor, control the processor to: (a) extract, from a frame of a first tone-compressed HDR image, tone-compressed pixel intensities from the active pixel data and a histogram of pre-tone-compression pixel intensities from the metadata, (b) derive, from the tone-compressed pixel intensities and the histogram, a correspondence between tone-compressed pixel intensities and pre-tone-compression pixel intensities, and (c) linearize at least a portion of the active pixel data of either the first tone-compressed HDR image or a subsequent tone-compressed HDR image, according to the correspondence, to produce a linearized HDR image.

Adaptive image data linearization for HDR image sensors

A method for generating an high-dynamic-range (HDR) color image from a dual-exposure-time single-shot HDR color image sensor includes obtaining pixel values generated by a local region of sensor pixels of the image sensor, determining a motion parameter for the local region from pixel values associated with a first color, and demosaicing the pixel values of the local region to determine, for each of three colors, an output value of the images pixel, wherein relative contributions of short-exposure-time pixels and long-exposure-time pixels to the output value are weighted according to the motion parameter. A method for generating an HDR color image from a triple-exposure-time single-shot HDR color image sensor includes generating a first dual-exposure-time HDR image from short-exposure-time and medium-exposure-time pixel values, generating a second dual-exposure-time HDR image from medium-exposure-time and long-exposure-time pixel values, and generating a triple-exposure-time HDR color image from the first and second dual-exposure-time HDR images.

HDR image generation from single-shot HDR color image sensors

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Manhattan Beach, CA, United States of America

Jon Scott Mcelvain