Image processing device, image processing method, and image processing program

Abstract

The invention provides an image processing device, image processing method, and image processing program. The image processing device comprises: a first image obtaining unit (101) for obtaining a first image which is obtained by imaging an object to be imaged at the time of non illumination in which the object to be imaged is not illuminated, a second image obtaining unit (102) for obtaining a second image which is obtained by imaging the object to be imaged at the time of illumination in which the object to be imaged is illuminated, a difference image generating unit (103) for generating a difference image which is composed of the difference between the luminance of each pixel in the first image obtained by the first image obtaining unit (101) and the luminance of each pixel in the second image obtained by the second image obtaining unit (102), a high luminance area extraction unit (105) for extracting the image area that is composed of pixels having higher luminances than a predetermined luminance value in the difference image generated by the difference image generating unit (103), and a movement determination unit (106) for determining the amount of movement of the object to be imaged from the timing when the first image is obtained to the timing when the second image is obtained in the image area extracted by the high luminance area extraction unit (105) are included.

Description

technical field [0001] The present invention relates to an image processing technique based on an image obtained by photographing the subject to be photographed during non-illumination when the subject is not illuminated, and an image obtained by photographing the subject under illumination when the subject is illuminated. , and extract the imaging target object on the captured image. Background technique [0002] Based on the purpose of monitoring and authentication, when shooting a subject entering the field of view through fixed-point observation, it is sometimes necessary to remove the background around the subject to form an image that only extracts the subject. [0003] Therefore, there is known a technique (hereinafter referred to as illumination start / stop difference) that blinks an illumination device for illuminating a subject entering the field of view of a camera, performs imaging in synchronization with the blinking timing of the illumination, and obtains the T...

AI Technical Summary

Problems solved by technology

[0010] By generating a difference image of two images continuously captured in synchronization with the flickering timing of the lighting, the background behind the captured subject is removed, the influence of disturbing light is removed, and an image in which only the subject is clearly captured is generated, in In this case, if the subject moves slightly between the images used to obtain the difference, even if the difference image is generated, the subject will be shaken, or unevenness will be emphasized unnaturally, and there is a problem that a clear image cannot be obtained.

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