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Automatic exposure method, computer program product and imaging system

A technology of automatic exposure and exposure time, which is applied in the parts of TV system, image communication, TV, etc.

Active Publication Date: 2022-05-31
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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  • Automatic exposure method, computer program product and imaging system
  • Automatic exposure method, computer program product and imaging system
  • Automatic exposure method, computer program product and imaging system

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Embodiment Construction

[0055] This paper discloses a system and method for automatic exposure of a spatially multiplexed exposure (Spatially-multiplexed-exposure, SME) high dynamic range (High-dynamic-range, HDR) image sensor and an automatic exposure function using the SME HDR image sensor camera system. Certain embodiments of the disclosed systems and methods have applicability beyond automatic exposure of SME HDR image sensors.

[0056] figure 1 and figure 2 One exposure time controller 100 for automatic exposure of the SME HDR image sensor 110 in the HDR camera 102 is illustrated. figure 1 Exposure time controller 100 is shown implemented in HDR camera 102 in one usage example. figure 2 is a functional block diagram illustrating the function of the exposure time controller 100 in the HDR camera 102 . best watch together figure 1 and figure 2 .

[0057] exist figure 1 In the usage scenario of , the HDR camera 102 generates an HDR image of the scene 190 with high dynamic range at least ...

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Abstract

An automatic exposure method, computer program product, and imaging system are provided, wherein the automatic exposure method for an image sensor includes (a) multiplication of pixel values ​​from respective plurality of individual exposures of the image sensor at respective exposure time settings; for each of the histograms, evaluating the variance of the contribution of the individual bins of the histogram to the total entropy of the histogram to determine the optimal exposure time for the image sensor corresponding to the smallest value of the variance; and (b) placing the optimal The exposure time is output to the image sensor.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to U.S. Provisional Patent Application No. 62 / 728,654, filed September 7, 2018, and European Patent Application No. 18193265.8, filed September 7, 2018, the entirety of each of these patent applications The contents are incorporated herein by reference. technical field [0003] This application relates to automatic exposure for digital cameras. Background technique [0004] For conventional digital cameras, adjusting proper image exposure is critical to obtaining high-quality images through the camera's image processing pipeline. Overexposure can produce overexposed areas of the image, and underexposure can result in excessive noise levels and possible color artifacts. For professional and high-end consumer cameras, such as digital single-lens reflex (DSLR) cameras, there are usually three parameters that are adjusted in the case of automatic exposure: exposure time, analog and / or dig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/235H04N5/355H04N5/353
CPCH04N23/741H04N23/73H04N25/68H04N25/60H04N25/533H04N25/583
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