Image processing apparatus, image division program and image synthesising method
First Claim
1. An image processing apparatus for capturing an image of an object and thereby performing an optical area division of a surface of the object, comprising:
- a polarization image capturing section for obtaining a polarization image of the object by receiving light having passed through a three-way or more polarizer having different polarization main axis angles,wherein the area division is performed based on a polarization state on the surface of the object and a light source dependency, which represents a degree of change in the polarization state on the surface of the object occurring when changing at least one of a polarization state of light emitted from a light source and a light source position.
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Abstract
A polarization image capturing section 103 obtains a first polarization image containing polarization information. A polarization information obtaining section 104 obtains first polarization information from the first polarization image. An illumination control section 102 changes an illumination section 101 and again obtains a second polarization image by means of the polarization image capturing section 103. The polarization information obtaining section 104 obtains second polarization information from the second polarization image. A light source dependency estimation section 105 obtains light source dependency from the first and second polarization information obtained from the first and second polarization images. An area dividing section 106 performs an area division by using the polarization information and light source dependency information.
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Citations
18 Claims
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1. An image processing apparatus for capturing an image of an object and thereby performing an optical area division of a surface of the object, comprising:
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a polarization image capturing section for obtaining a polarization image of the object by receiving light having passed through a three-way or more polarizer having different polarization main axis angles, wherein the area division is performed based on a polarization state on the surface of the object and a light source dependency, which represents a degree of change in the polarization state on the surface of the object occurring when changing at least one of a polarization state of light emitted from a light source and a light source position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An image processing system comprising an illumination device and an area dividing device for capturing an image of an object and thereby performing an optical area division of a surface of the object,
the illumination device comprising: -
an illumination section for emitting linearly-polarized light onto the object; and an illumination control section for changing a polarization state of the linearly-polarized light of the illumination section, the area dividing device comprising; a polarization image capturing section for obtaining a polarization image of the object by receiving light having passed through a three-way or more polarizer having different polarization main axis angles; a captured image determination section for comparing a polarization image captured in a past by the polarization image capturing section with a currently-captured polarization image to thereby determine whether the captured polarization states have changed sufficiently; a polarization information obtaining section for generating, from the obtained polarization image, polarization information for received polarized light by using a correspondence with a brightness of the light having passed through the three-way or more polarizer, for each of unit pixels of the polarization image; a light source dependency estimation section for estimating a light source dependency information by making a comparison between the polarization information generated by the polarization information obtaining section when it is determined by the captured image determination section that the polarization state of the illumination section has been changed by the illumination control section; and an area dividing section for performing the area division by using the polarization information generated by the polarization information obtaining section and light source variation information estimated by the light source dependency estimation section.
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14. An image processing system comprising an illumination device and an area dividing device for capturing an image of an object and thereby performing an optical area division of a surface of the object,
the illumination device comprising: -
an illumination section for emitting linearly-polarized light onto the object; an illumination control section for changing a polarization state of the linearly-polarized light of the illumination section; and a communication section for transmitting a signal indicating a light emission to the area dividing device and receiving a signal indicating a completion of image-capturing from the area dividing device, the area dividing device comprising; a communication section for receiving a signal indicating a light emission from the illumination device and transmitting a signal indicating a completion of image-capturing to the illumination device; a polarization image capturing section for obtaining a polarization image of the object by receiving light having passed through a three-way or more polarizer having different polarization main axis angles; a captured image determination section for comparing a polarization image captured in a past by the polarization image capturing section with a currently-captured polarization image to thereby determine whether the captured polarization states have changed sufficiently; a polarization information obtaining section for generating, from the obtained polarization image, polarization information for received polarized light by using a correspondence with a brightness of the light having passed through the three-way or more polarizer, for each of unit pixels of the polarization image; a light source dependency estimation section for estimating light source dependency information by making a comparison between the polarization information generated by the polarization information obtaining section when it is determined by the captured image determination section that the polarization state of the illumination section has been changed by the illumination control section; and an area dividing section for performing the area division by using the polarization information generated by the polarization information obtaining section and light source variation information estimated by the light source dependency estimation section.
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15. An area dividing method for capturing an image of an object and thereby performing an optical area division of a surface of the object, comprising:
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an illumination step of emitting linearly-polarized light onto the object; an illumination control step of changing a polarization state of the linearly-polarized light of the illumination section; a polarization image capturing step of obtaining a polarization image of the object by receiving light having passed through a three-way or more polarizer having different polarization main axis angles; a polarization information obtaining step of generating, from the obtained polarization image, polarization information for received polarized light by using a correspondence with a brightness of the light having passed through the three-way or more polarizer, for each of unit pixels of the polarization image; a control step of synchronizing the illumination control step with the polarization image capturing step; a light source dependency estimation step of estimating light source dependency information by making a comparison between the polarization information generated by the polarization information obtaining step when the polarization state of the illumination step is changed by the illumination control step; and an area dividing step of performing the area division by using the polarization information generated by the polarization information obtaining step and light source variation information estimated by the light source dependency estimation step. - View Dependent Claims (16, 17, 18)
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Specification