Method and apparatus for detecting moving object
First Claim
1. A method of detecting a moving object, comprising:
- (a) a first dividing step of dividing an input image into a plurality of first unit blocks;
(b) a second dividing step of dividing a given background image into a plurality of second unit blocks;
(c) a moving block extracting step of comparing said first unit blocks with said second unit blocks for every unit block and extracting a number of said first unit blocks, which are different in brightness distribution pattern from the corresponding second unit blocks, as moving blocks;
(d) a moving area setting step of setting a moving area that surrounds said moving blocks extracted in said moving block extracting step; and
(e) a brightness comparing step of comparing a distribution of brightness values of the input image with a distribution of brightness values of the background image in the moving area, which is set by said moving area setting step, to discriminate whether or not a moving object appears in the input image.
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Abstract
For automatically detecting a moving object in an input image taken using a monitor camera or the like, an apparatus includes an input image extracting section, an input image retaining section, a background image retaining section, a background difference calculating section, a moving direction recognizing section, and a united judging section. A movement of an object is detected with precision even in an environment where illumination varies, irrespective of the relative position of a ridge line of the object and a border of unit blocks. And only the moving object can be detected stably even when the camera encounters swing, vibration, etc.
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Citations
28 Claims
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1. A method of detecting a moving object, comprising:
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(a) a first dividing step of dividing an input image into a plurality of first unit blocks;
(b) a second dividing step of dividing a given background image into a plurality of second unit blocks;
(c) a moving block extracting step of comparing said first unit blocks with said second unit blocks for every unit block and extracting a number of said first unit blocks, which are different in brightness distribution pattern from the corresponding second unit blocks, as moving blocks;
(d) a moving area setting step of setting a moving area that surrounds said moving blocks extracted in said moving block extracting step; and
(e) a brightness comparing step of comparing a distribution of brightness values of the input image with a distribution of brightness values of the background image in the moving area, which is set by said moving area setting step, to discriminate whether or not a moving object appears in the input image. - View Dependent Claims (2, 3, 4)
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5. A method of detecting a moving object, comprising:
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(a) a monitoring region clipping step of clipping a monitoring region, which is to be monitored, from an input image;
(b) a region dividing step of dividing the monitoring region, which is clipped in said monitoring region clipping step, into a plurality of zones;
(c) a variance calculating step of calculating a variance of brightness values for each and every one of the plural zones obtained in said region dividing step; and
(d) an appearance detecting step of discriminating whether or not a moving object appears in the input image based on the variance calculated in said variance calculating step. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of detecting a moving object in an input image, comprising:
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(a) a monitoring region clipping step of clipping a monitoring region, which is to be monitored, from the input image;
(b) a first region dividing step of dividing the monitoring region, which is clipped in said monitoring region clipping step, into a plurality of zones in a direction perpendicular to a direction in which the moving object enters;
(c) a variance calculating step of calculating a variance of brightness values for each and every one of the plural zones obtained in said first region dividing step;
(d) a zone discriminating step of discriminating whether an individual one of the plural zones is an object-appearing zone in which the moving object appears or an object-free zone in which the moving object is absent, by comparing the variance obtained in said variance calculating step with a predetermined value; and
(e) a moving-direction recognizing step of recognizing a direction in which the moving object moves, based on a direction of occurrence of the object-appearing zone found as the result of discrimination in said zone discriminating step. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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26. An apparatus for detecting a moving object in an input image, comprising:
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(a) an input image retaining section for retaining the input image;
(b) a background image retaining section, connected to said input image retaining section, for retaining a given background image;
(c) a background difference calculating section, connected to said input image retaining section and said background image retaining section, for calculating a difference between the input image and the background image;
(d) a moving direction recognizing section, connected to said input image retaining section, for dividing data of the input image into a plurality of pieces of data one piece for each of a plurality of zones and evaluating the data; and
(e) a united judging section, connected to said background difference calculating section and said moving direction recognizing section, for judging the appearance of the moving object and the direction of moving of the moving object. - View Dependent Claims (27, 28)
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Specification