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Auto exposure of image sensors based upon entropy variance

An image sensor and automatic exposure technology, applied in image communication, color TV parts, TV system parts, etc.

Active Publication Date: 2021-04-13
DOLBY LAB LICENSING CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, short and long exposures are recorded at different times with at least a full-frame readout process in between, and as a result, image combination often produces undesired artifacts when the scene is not static

Method used

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  • Auto exposure of image sensors based upon entropy variance
  • Auto exposure of image sensors based upon entropy variance
  • Auto exposure of image sensors based upon entropy variance

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Embodiment Construction

[0055]This document discloses a system and method for automatic exposure for spatially-multiplexed-expression (hight-dynamic-range, HDR) image sensor and the SME HDR image sensor and has an automatic exposure function. Camera system. Certain embodiments of the disclosed systems and methods have the applicability of automatic exposure exceeding the SME HDR image sensor.

[0056]figure 1 withfigure 2 A exposure time controller 100 for automatic exposure for the SME HDR image sensor 110 in the HDR camera 102 is illustrated.figure 1 The exposure time controller 100 implemented in the HDR camera 102 in one example is shown.figure 2 It is a functional block diagram illustrating the function of the exposure time controller 100 in the HDR camera 102. It is best to watch togetherfigure 1 withfigure 2 .

[0057]infigure 1 In the use scenario, the HDR camera 102 generates at least because the human 192 illuminates the HDR image of the scene 190 with high dynamic range by the sun 196 backlight, so th...

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Abstract

An auto exposure method for an image sensor includes (a) evaluating variance, for each of a plurality of histograms of the pixel values from a respective plurality of individual exposures of the image sensor at respective exposure 5 time settings, of contribution from individual bins of the histogram to total entropy of the histogram, to determine an optimal exposure time for the image sensor corresponding to a minimum value of the variance, and (b) outputting the optimal exposure time to the image sensor.

Description

[0001]Cross-reference[0002]The present application claims the US Provisional Patent Application No. 62 / 728,654, filed on September 7, 2018, and prioritization of European patent application filed on September 7, 2018, all of these patent applications The content is incorporated herein by reference.Technical field[0003]This application relates to automatic exposure of digital cameras.Background technique[0004]For traditional digital cameras, adjusting appropriate image exposure is critical to obtaining high quality images for processing pipelines through camera image. Excessive exposure may generate an exposure area of ​​the image, and insufficient exposure may cause excessive noise levels and possible color artifacts. For professional and high-end consumer cameras, such as digital single mirror reflective (DSLR) cameras, there is usually three parameters adjusted in the case of automatic exposure: exposure time, simulation, and / or digital gain (ISO speed) and iris aperture size ...

Claims

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Application Information

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IPC IPC(8): H04N5/235H04N5/355H04N5/353
CPCH04N25/60H04N23/741H04N23/73H04N25/533H04N25/583
Inventor J·S·麦克尔文W·C·吉什J·R·米勒G·J·沃德R·阿特金斯
Owner DOLBY LAB LICENSING CORP