Subject area extracting method and image pick up apparatus using the same
First Claim
1. An image pickup apparatus for extracting a subject area from a picked-up image of a target object as a subject, comprising:
- a space-frequency characteristic pattern irradiating section which irradiates a visible light which has passed through an optical filter having a predetermined space-frequency characteristic to said target object;
a camera for picking up said target object;
a difference image generating section which generates a difference image between a first image picked up by said camera when said visible light is irradiated from said space-frequency characteristic pattern irradiating section and a second image picked up by said camera when said visible light is not irradiated from said space-frequency characteristic pattern irradiating section;
a space-frequency domain transforming section which transforms said difference image generated by said difference image generating section to a space-frequency domain to acquire a space-frequency characteristic of each pixel of said difference image;
a space-frequency pattern collating section which collates said space-frequency characteristic of each pixel acquired by said space-frequency domain transforming section with said space-frequency characteristic of said optical filter; and
a subject image generating section which generates a subject image from which said subject area has been extracted based on a result of collation performed by said space-frequency pattern collating section.
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Accused Products
Abstract
An image pickup apparatus comprises a space-frequency characteristic pattern irradiating section which irradiates a visible light which has passed through an optical filter having a predetermined space-frequency characteristic to the target object; a camera; a difference image generating section which generates a difference image between a first and a second image each picked up by the camera when the visible light is irradiated or not irradiated from the space-frequency characteristic pattern irradiating section; a space-frequency domain transforming section which transforms the generated difference image to a space-frequency domain to acquire a space-frequency characteristic of each pixel of the difference image; a space-frequency pattern collating section which collates the space-frequency characteristic of each acquired pixel with the space-frequency characteristic of the optical filter; and a subject image generating section which generates a subject image from which the subject area has been extracted based on a result of collation.
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Citations
21 Claims
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1. An image pickup apparatus for extracting a subject area from a picked-up image of a target object as a subject, comprising:
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a space-frequency characteristic pattern irradiating section which irradiates a visible light which has passed through an optical filter having a predetermined space-frequency characteristic to said target object;
a camera for picking up said target object;
a difference image generating section which generates a difference image between a first image picked up by said camera when said visible light is irradiated from said space-frequency characteristic pattern irradiating section and a second image picked up by said camera when said visible light is not irradiated from said space-frequency characteristic pattern irradiating section;
a space-frequency domain transforming section which transforms said difference image generated by said difference image generating section to a space-frequency domain to acquire a space-frequency characteristic of each pixel of said difference image;
a space-frequency pattern collating section which collates said space-frequency characteristic of each pixel acquired by said space-frequency domain transforming section with said space-frequency characteristic of said optical filter; and
a subject image generating section which generates a subject image from which said subject area has been extracted based on a result of collation performed by said space-frequency pattern collating section. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An image pickup apparatus for extracting a subject area from a picked-up image of a target object as a subject, comprising:
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a space-frequency characteristic pattern irradiating section for irradiating a visible light which has passed through an optical filter having a predetermined space-frequency characteristic to said target object;
camera for picking up said target object;
a processor; and
a storage which stores a program to be executed by said processor, wherein said processor;
generates a difference image between a first image picked up by said camera when said visible light is irradiated from said space-frequency characteristic pattern irradiating section and a second image picked up by said camera when said visible light is not irradiated from said space-frequency characteristic pattern irradiating section;
transforms said generated difference image to a space-frequency domain to acquire a space-frequency characteristic of each pixel of said difference image;
collates said acquired space-frequency characteristic of each pixel with said space-frequency characteristic of said optical filter; and
generates a subject image from which said subject area has been extracted based on a result of collation performed by said space-frequency pattern collating section. - View Dependent Claims (8, 9, 10, 11, 12, 14, 15, 16, 17, 19, 20, 21)
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13. A subject area extracting method for extracting a subject area from a picked-up image of a target object as a subject, comprising the steps of:
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irradiating a visible light which has passed through an optical filter having a predetermined space-frequency characteristic to said target object;
generating a difference image between a first image picked up when said visible light is irradiated and a second image picked up when said visible light is not irradiated;
transforming said generated difference image to a space-frequency domain to acquire a space-frequency characteristic of each pixel of said difference image;
collating said acquired space-frequency characteristic of each pixel with said space-frequency characteristic of said optical filter; and
generating a subject image from which said subject area has been extracted based on a result of collation.
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18. A program which makes a computer:
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generate a difference image between a first image picked up when a visible light which has passed through an optical filter having a predetermined space-frequency characteristic is irradiated to a target object as a subject and a second image picked up when said visible light is not irradiated to said target object;
transform said generated difference image to a space-frequency domain to acquire a space-frequency characteristic of each pixel of said difference image;
collate said acquired space-frequency characteristic of each pixel with said space-frequency characteristic of said optical filter; and
generate a subject image from which said subject area has been extracted based on a collation result.
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Specification