Method and apparatus for determining if imaging object is still
AssigneeHitachi Software Engineering Co., Ltd.
InventorMitsuharu Tsukiori
Life of this patent
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Abstract
For an image of an object for use in biometrics and the like, if the imaging object is still is detected with a simple configuration. From two pieces of image data that have been captured in time series, the absolute value of the difference in brightness of pixels in the identical position is calculated, and the number of pixels whose absolute values exceed the threshold value indicative of the limit of the brightness change is counted. The counted result is compared with the movement determination threshold value to determine if the imaging object is still.
Claims2
A method for determining if an imaging object is still with determination means, based on two images of the object that have been captured with imaging means in time series, the method comprising the following steps performed by the determination means:
- a first step of calculating an absolute value of a difference in brightness of pixels in the identical position of the two images;
- a second step of comparing the calculated absolute value of the difference of the pixels with a threshold indicative of a limit of a brightness change;
- a third step of counting the number of pixels whose absolute values'exceed the threshold value indicative of the limit of the brightness change;
- and
- a fourth step of determining if the imaging object in the second image of the two images, which has been captured at a later timing than the first image, is still depending on whether a count value counted in the third step exceeds a stillness determination threshold value or not.
An apparatus for determining if an imaging object is still based on two images of the object that have been captured with imaging means in time series, the apparatus comprising:
- first means for calculating an absolute value of a difference in brightness of pixels in the identical position of the two images;
- second means for comparing the calculated absolute value of the difference of the pixels with a threshold value indicative of a limit of a brightness change;
- third means for counting the number of pixels whose absolute values exceed the threshold value indicative of the limit of the brightness change;
- and
- fourth means for determining if the imaging object in the second image of the two images, which has been captured at a later timing than the first image, is still depending on whether a count value counted by the third means exceeds a stillness determination threshold value or not.
Dependencies are inferred from the claim text.