METHOD, APPARATUS, AND PROGRAM FOR DETECTING OBJECT
First Claim
1. An object detecting method that detects a specific kind of object from a continuous image including a plurality of frames each of which is expressed by two-dimensionally arrayed pixels, the object detecting method comprising:
- a differential image producing step of producing a differential image between a first frame and a second frame in the plurality of frames constituting the continuous image, the first frame and the second frame being different from each other;
a search pixel extracting step of computing a differential value between new values of pixels corresponding to the first frame and the second frame, of comparing the differential value and a threshold, and of extracting a search pixel on the differential image, when an average value of values of a plurality of pixels in an averaging region having a two-dimensional predetermined size around each pixel for each of the first frame and the second frame is set at a new value of each pixel, the search pixel searching existence of the specific kind of object; and
an object detecting step of applying a filter to a search region including the search pixel extracted in the search pixel extracting step on the differential image produced in the differential image producing step, of obtaining an evaluated value with the filter, and of comparing the evaluated value and the threshold to extract a region where the specific kind of object exists, the filter acting on a search region having an area and a shape that are identical to those of the averaging region on the image, the filter obtaining the evaluated value indicating a probability that the specific kind of object exists in the search region.
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Abstract
A region where a detecting target object exists is extracted by a comparison between an evaluated value indicating a probability that the detecting target object exists and a threshold, through the process of producing a differential image between different frames in plural frames constituting a continuous image, of setting an average value in an averaging region extended around each pixel of the differential image as a new value of each pixel, of obtaining the evaluated value by applying a filter that acts on a search region on an image to a search region extended around a search pixel that is extracted by comparing the new value and the threshold, on the differential image.
19 Citations
18 Claims
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1. An object detecting method that detects a specific kind of object from a continuous image including a plurality of frames each of which is expressed by two-dimensionally arrayed pixels, the object detecting method comprising:
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a differential image producing step of producing a differential image between a first frame and a second frame in the plurality of frames constituting the continuous image, the first frame and the second frame being different from each other; a search pixel extracting step of computing a differential value between new values of pixels corresponding to the first frame and the second frame, of comparing the differential value and a threshold, and of extracting a search pixel on the differential image, when an average value of values of a plurality of pixels in an averaging region having a two-dimensional predetermined size around each pixel for each of the first frame and the second frame is set at a new value of each pixel, the search pixel searching existence of the specific kind of object; and an object detecting step of applying a filter to a search region including the search pixel extracted in the search pixel extracting step on the differential image produced in the differential image producing step, of obtaining an evaluated value with the filter, and of comparing the evaluated value and the threshold to extract a region where the specific kind of object exists, the filter acting on a search region having an area and a shape that are identical to those of the averaging region on the image, the filter obtaining the evaluated value indicating a probability that the specific kind of object exists in the search region. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An object detecting apparatus that detects a specific kind of object from a continuous image including a plurality of frames each of which is expressed by two-dimensionally arrayed pixels, the object detecting apparatus comprising:
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a differential image producing section that produces a differential image between a first frame and a second frame in the plurality of frames constituting the continuous image, the first frame and the second frame being different from each other; a search pixel extracting section that computes a differential value between new values of pixels corresponding to the first frame and the second frame, compares the differential value and a threshold, and extracts a search pixel on the differential image, when an average value of values of a plurality of pixels in an averaging region having a two-dimensional predetermined size around each pixel for each of the first frame and the second frame is set at a new value of each pixel, the search pixel searching existence of the specific kind of object; a filter storage section in which a filter is stored, the filter acting on a search region having an area and a shape that are identical to those of the averaging region on the image, the filter obtaining an evaluated value indicating a probability that the specific kind of object exists in the search region; and an object detecting section that applies a filter stored in the filter storage section to the search region including the search pixel extracted by the search pixel extracting section on the differential image produced by the differential image producing section, obtains the evaluated value with the filter, and compares the evaluated value and the threshold to extract a region where the specific kind of object exists. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A non-transitory computer-readable storage medium storing an object detecting program that is executed in an operation device, the object detecting program causing the operation device to be operated as a object detecting apparatus that detects a specific kind of object from a continuous image including a plurality of frames each of which is expressed by two-dimensionally arrayed pixels, the object detecting apparatus comprising:
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a differential image producing section that produces a differential image between a first frame and a second frame in the plurality of frames constituting the continuous image, the first frame and the second frame being different from each other; a search pixel extracting section that computes a differential value between new values of pixels corresponding to the first frame and the second frame, compares the differential value and a threshold, and extracts a search pixel on the differential image, when an average value of values of a plurality of pixels in an averaging region having a two-dimensional predetermined size around each pixel for each of the first frame and the second frame is set at a new value of each pixel, the search pixel searching existence of the specific kind of object; a filter storage section in which a filter is stored, the filter acting on a search region having an area and a shape that are identical to those of the averaging region on the image, the filter obtaining an evaluated value indicating a probability that the specific kind of object exists in the search region; and an object detecting section that applies a filter stored in the filter storage section to the search region including the search pixel extracted by the search pixel extracting section on the differential image produced by the differential image producing section, obtains the evaluated value with the filter, and compares the evaluated value and the threshold to extract a region where the specific kind of object exists. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification