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Imaging device with scene adaptive automatic exposure compensation

An automatic exposure and pixel technology, applied in measuring devices, image enhancement, image analysis, etc., can solve problems such as overexposure and inability to directly control illumination intensity

Active Publication Date: 2018-06-01
MOTOROLA SOLUTIONS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with this approach is: if the scene contains very small (<1% of image pixels) objects that are much brighter than the rest of the image, these objects will be overexposed and appear saturated in the image
Specifically, this approach is not suitable for cameras using external IR illuminators, where the illumination intensity cannot be directly controlled

Method used

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  • Imaging device with scene adaptive automatic exposure compensation
  • Imaging device with scene adaptive automatic exposure compensation
  • Imaging device with scene adaptive automatic exposure compensation

Examples

Experimental program
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Embodiment Construction

[0016] Embodiments described herein provide a scene adaptive automatic exposure compensation method for use in automatic exposure operation of imaging devices such as security cameras. The scene-adaptive automatic exposure compensation method consists of two components, the first component applies a mask to saturated objects in the image background ("background saturation mask generator"), and the second component, The second component provides bias values ​​for different parts of the image histogram when calculating the autoexposure target value for the image average based autoexposure operation ("autoexposure companion for controlling saturation level"). The first component causes the auto-exposure operation to ignore background-saturated objects that could otherwise cause the auto-exposure operation to underexpose objects of interest in the image. The second component controls the level of saturation in the image by lowering the autoexposure target value for the autoexposur...

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Abstract

One method adjusts an auto-exposure target in an auto-exposure operation for a series of images, such as a series of infrared images. The method comprises: obtaining a histogram of at least one of the images; applying a weighted histogram to the histogram to obtain weighted histogram bars, wherein at least some of the bars in the histogram containing saturated pixels are assigned a lower a high weighting value, and at least some bars in the histogram containing unsaturated pixels are assigned a lower weighting value; and summing the weighted histogram bars to obtain a saturation score, and when the saturation score exceeds the first When the saturation score is lower than the first threshold and the image is underexposed, the automatic exposure target is increased.

Description

technical field [0001] The present disclosure generally relates to a scene adaptive automatic exposure compensation method and an imaging device operable to perform the method. Background technique [0002] It is often desirable to use an automatic exposure algorithm in a camera to ensure that images are obtained with a balanced shutter time and gain under varying lighting conditions. Usually the goal of the auto exposure algorithm is to maintain a constant global brightness for the image by adjusting the shutter time and gain. The problem with this approach is: if the scene contains very small (<1% of image pixels) objects that are much brighter than the rest of the image, these objects will be overexposed and appear saturated in the image. This problem is particularly acute for cameras equipped with infrared ("IR") illuminators, since certain small objects of interest (eg, license plates) have a much higher IR reflectivity than the rest of the scene. However, if the c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03B7/28H04N5/351
CPCH04N23/70H04N23/76H04N23/20G06T5/40H04N23/73H04N23/71G06T2207/10048G06T2207/20072H04N5/33
Inventor S·艾佛鲁兹G·桑
Owner MOTOROLA SOLUTIONS INC