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Hdr image generation from single-shot hdr color image sensors

A color image and image technology, applied in the field of high dynamic range imaging, can solve problems affecting image quality and so on

Active Publication Date: 2021-11-23
DOLBY LAB LICENSING CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, even if the exposure times of these two different types of pixels overlap, the presence of motion can still adversely affect the quality of the recorded image

Method used

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  • Hdr image generation from single-shot hdr color image sensors
  • Hdr image generation from single-shot hdr color image sensors
  • Hdr image generation from single-shot hdr color image sensors

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Embodiment Construction

[0044] figure 1 One motion compensated high dynamic range (HDR) camera 110 for generating a motion compensated HDR color image 180 is illustrated. The HDR camera 110 includes a dual exposure time single shot HDR color image sensor 120 and a motion compensated HDR image generator 100 . The image sensor 120 is configured to expose some of its photosensitive pixels with a short exposure time and to expose other of its photosensitive pixels with a longer exposure time. Thus, each image frame captured by image sensor 120 contains both short exposure time image data and long exposure time image data. However, since the shorter exposure time and the longer exposure time have different durations, the short exposure time image data and the long exposure time image data may represent different scene compositions when motion occurs in the scene. The motion-compensated HDR image generator 100 combines short-exposure time image data and long-exposure time image data generated by the imag...

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Abstract

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.

Description

[0001] This application is a divisional application of a Chinese invention patent application with the application number 201980036715.3 and the title of the invention "Generating HDR images from a single-shot HDR color image sensor" that entered the Chinese national phase on November 30, 2020. [0002] Cross References to Related Applications [0003] This application claims U.S. Provisional Patent Application No. 62 / 681,789, filed June 7, 2018, and European Patent Application No. 18176403.6, filed June 7, 2018, and U.S. Provisional Patent Application No., filed April 23, 2019 62 / 837,361, which is hereby incorporated by reference in its entirety. technical field [0004] This application relates to high dynamic range imaging. Background technique [0005] Most handheld camera devices, such as smartphones, utilize image sensors with a bit depth of 8 or possibly 10 bits. For many scenes, this bit depth is insufficient to capture both the brightest and darkest areas of the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/235H04N23/12H04N25/46
CPCH04N23/741H04N5/144H04N25/46H04N25/583H04N23/843H04N23/12G06T3/4015G06T7/248G06T7/55G06T2207/10024G06T2207/20224
Inventor 李粤龙J·S·麦克尔韦恩M·托菲
Owner DOLBY LAB LICENSING CORP