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US 7,480,407 B2Granted
Surface region identification by image area segmentation
AssigneeDainippon Screen Mfg. Co., Ltd.
InventorsAtsushi Imamura, Hiroshi Sano, Eiji Nishihara, Junichi Shiomi
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Abstract
The present invention provides a technique to identify layout of surface regions of an object by image area segmentation. A plurality of images is acquired by imaging an object under a plurality of mutually different illumination conditions. By performing area segmentation on this plurality of images, the layouts of the plurality of image areas which is different from the layout of the object surface regions is obtained. Then, the layout of the surface regions on the object is identified based on the layouts of the plurality of image areas.
Claims7
A method for identifying layout of a plurality of surface regions on an object, the method comprising the steps of:
- (a) acquiring a plurality of images of the object under a plurality of mutually different illumination conditions;
- (b) obtaining layouts of a plurality of image areas different from the layout of the plurality of surface regions on the object by performing segmentation on the plurality of images respectively;
- and
- (c) identifying the layout of the plurality of surface regions based on the layouts of the plurality of image areas,
- wherein the step (a) includes the steps of
- acquiring a first image of the object under a first illumination condition wherein an image area corresponding to a first surface region among the plurality of surface regions is reproducible by segmentation of the first image;
- and
- acquiring a second image of the object under a second illumination condition wherein an image area corresponding to a second surface region among the plurality of surface regions is reproducible by segmentation of the second image, the second surface region being to be represented by two or more image areas in a segmentation result of the first image, and
- the step (b) includes the steps of:
- (b1) obtaining a layout of an image area corresponding to a surface region including the first surface region by segmentation of at least a part of the first image;
- and
- (b2) obtaining a layout of an image area corresponding to a surface region including the second surface region by segmentation of the second image.
9 more elements
An apparatus for identifying layout of a plurality of surface regions on an object, the apparatus comprising:
- an image acquisition unit configured to acquire a plurality of images of the object under a plurality of mutually different illumination conditions;
- an image area obtainment unit configured to obtain layouts of a plurality of image area different from the layout of the plurality of surface regions on the object by performing segmentation on the plurality of images respectively;
- and
- a surface region layout identification unit configured to identify the layout of the plurality of surface regions based on the layouts of the plurality of image areas,
- wherein the image acquisition unit includes:
- a first image acquisition unit configured to acquire a first image of the object under a first illumination condition wherein an image area corresponding to a first surface region among the plurality of surface regions is reproducible by segmentation of the first image;
- and
- a second image acquisition unit configured to acquire a second image of the object under a second illumination condition wherein an image area corresponding to a second surface region among the plurality of surface regions is reproducible by segmentation of the second image, the second surface region being to be represented by two or more image areas in a segmentation result of the first image, and
- wherein image area obtainment unit includes:
- a first layout obtainment unit configured to obtain a layout of an image area corresponding to a surface region including the first surface region by segmentation of at least a part of the first image;
- and
- a second layout obtainment unit configured to obtain a layout of an image area corresponding to a surface region including the second surface region by segmentation of the second image.
9 more elements
A method for detecting a defect of an object wherein the defect appears as a change in layout of a plurality of surface regions on the object, the method comprising the steps of:
- (a) acquiring a plurality of images of the object under a plurality of mutually different illumination conditions;
- (b) obtaining layouts of a plurality of image areas different from the layout of the plurality of surface regions on the object by performing segmentation on the plurality of images respectively;
- (c) identifying the layout of the plurality of surface regions based on the layouts of the plurality of image areas;
- and
- (d) detecting the defect in accordance with the layout of the plurality of surface regions,
- wherein the step (a) includes the steps of
- acquiring a first image of the object under a first illumination condition wherein an image area corresponding to a first surface region among the plurality of surface regions is reproducible by segmentation of the first image;
- and
- acquiring a second image of the object under a second illumination condition wherein an image area corresponding to a second surface region among the plurality of surface regions is reproducible by segmentation of the second image, the second surface region being to be represented by two or more image areas in a segmentation result of the first image, and
- the step (b) includes the steps of:
- (b1) obtaining a layout of an image area corresponding to a surface region including the first surface region by segmentation of at least a part of the first image;
- and
- (b2) obtaining a layout of an image area corresponding to a surface region including the second surface region by segmentation of the second image.
10 more elements
An apparatus for detecting a defect of an object wherein the defect appears as a change in layout of a plurality of surface regions on the object, the apparatus comprising:
- an image acquisition unit configured to acquire a plurality of images of the object under a plurality of mutually different illumination conditions;
- an image area obtainment unit configured to obtain layouts of a plurality of image areas different from the layout of the plurality of surface regions on the object by performing segmentation on the plurality of images respectively;
- a surface region layout identification unit configured to obtain the layout of the plurality of surface regions based on the layouts of the plurality of image areas;
- and a testing unit configured to detect the defect in accordance with the layout of the plurality of surface regions,
- wherein the image acquisition unit includes:
- a first image acquisition unit configured to acquire a first image of the object under a first illumination condition wherein an image area corresponding to a first surface region among the plurality of surface regions is reproducible by segmentation of the first image;
- and
- a second image acquisition unit configured to acquire a second image of the object under a second illumination condition wherein an image area corresponding to a second surface region among the plurality of surface regions is reproducible by segmentation of the second image, the second surface region being to be represented by two or more image areas in a segmentation result of the first image, and
- wherein image area obtainment unit includes:
- a first layout obtainment unit configured to obtain a layout of an image area corresponding to a surface region including the first surface region by segmentation of at least a part of the first image;
- and
- a second layout obtainment unit configured to obtain a layout of an image area corresponding to a surface region including the second surface region by segmentation of the second image.
9 more elements
Dependencies are inferred from the claim text.