IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0639735
(2006-12-15)
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등록번호 |
US-7421195
(2008-09-02)
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우선권정보 |
JP-2004-182513(2004-06-21) |
발명자
/ 주소 |
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출원인 / 주소 |
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대리인 / 주소 |
Frishauf, Holtz, Goodman & Chick, P.C.
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인용정보 |
피인용 횟수 :
1 인용 특허 :
8 |
초록
▼
A storage unit is configured to store beforehand a table that shows a relation between spread parameters and command values supplied to a control unit to acquire a focused image of an object, and information that designates a command value corresponding to an inflection point on an approximated curv
A storage unit is configured to store beforehand a table that shows a relation between spread parameters and command values supplied to a control unit to acquire a focused image of an object, and information that designates a command value corresponding to an inflection point on an approximated curve showing the relation that the spread parameters have with the command values, the control unit being configured to control a state of an optical system in accordance with an input command value. The luminance information about the object that lies at a distance falling within a range over which focusing should be detected is acquired, at the position of the optical system, which is obtained by the command value corresponding to the inflection point shown in the table.
대표청구항
▼
What is claimed is: 1. An apparatus for acquiring focusing information, comprising: an optical system configured to focus light coming from an object, at a predetermined position, in order to photograph the object and acquire a focused image of the object; a luminance-information acquiring unit con
What is claimed is: 1. An apparatus for acquiring focusing information, comprising: an optical system configured to focus light coming from an object, at a predetermined position, in order to photograph the object and acquire a focused image of the object; a luminance-information acquiring unit configured to acquire luminance information items about corresponding regions of at least two of a plurality of images which differ in unclearness and which have been formed by the light that has passed through at least one part of the optical system; a control unit configured to control a state of at least one of the optical system and the luminance-information acquiring unit in accordance with an input command value; a spread-parameter calculating unit configured to calculate a spread parameter from a plurality of luminance information items acquired by the luminance-information acquiring unit; a storage unit configured to store a table that shows a relation between spread parameters and command values supplied to the control unit to acquire a focused image of the object, and information that designates a command value corresponding to an inflection point on an approximated curve showing the relation that the spread parameters have with the command values; and a command-outputting unit configured to output the command value to the control unit in order to acquire a focused image of the object, by using the spread parameter calculated by the spread-parameter calculating unit and the table stored in the storage unit, at least one of the luminance information items acquired by the luminance-information acquiring unit having been acquired under a specific condition established by inputting to the control unit the command value corresponding to the inflection point that is designated on the basis of the information stored in the storage unit. 2. The apparatus for acquiring focusing information according to claim 1, wherein the optical system includes a diaphragm and a photographing lens. 3. The apparatus for acquiring focusing information according to claim 2, wherein a state of the optical system controlled by the control unit is controlled in accordance with one of a diameter of the diaphragm and a length of an optical path that the photographing lens incorporated in the optical system has with respect to the object. 4. The apparatus for acquiring focusing information according to claim 1, wherein the luminance-information acquiring unit acquires luminance of a specific region of an image. 5. The apparatus for acquiring focusing information according to claim 1, wherein the luminance-information acquiring unit is an integrated unit of photoelectric transducer elements. 6. The apparatus for acquiring focusing information according to claim 1, wherein the luminance-information acquiring unit is an imaging element. 7. The apparatus for acquiring focusing information according to claim 1, wherein a state of the luminance-information acquiring unit controlled by the control unit is controlled in accordance with a length of an optical path between the object and the luminance-information acquiring unit. 8. The apparatus for acquiring focusing information according to claim 1, wherein the table stored in the storage unit is a table showing command values related to spread parameters. 9. The apparatus for acquiring focusing information according to claim 1, wherein the table finally shows a relation between the command values supplied to the control unit and the spread parameters, when a plurality of tables are referred to. 10. The apparatus for acquiring focusing information according to claim 1, wherein the information that designates a command value corresponding to an inflection point includes one of the command value corresponding to the inflection point and a discrete value from which the command value can be inferred. 11. The apparatus for acquiring focusing information according to claim 1, wherein the optical system assumes the specific condition before the optical system is set in a condition that a focused image is acquirable. 12. The apparatus for acquiring focusing information according to claim 1, wherein the optical system assumes the specific condition before the optical system is set in a condition for acquiring the focused image. 13. The apparatus for acquiring focusing information according to claim 1, further comprising an operation input unit, and wherein operation of the operation input unit is detected and the specific condition is set in interlock with the operation of the operation input unit. 14. The apparatus for acquiring focusing information according to claim 1, wherein the specific condition is set after previous focused photographing. 15. The apparatus for acquiring focusing information according to claim 1, wherein the control unit includes: a drive unit configured to drive at least one of the optical unit and the luminance-information acquiring unit; and a drive-unit state detecting unit configured to detect the position of the drive unit. 16. An apparatus for acquiring focusing information, comprising: an optical system configured to focus light coming from an object, at a predetermined position, in order to photograph the object and acquire a focused image of the object; a luminance-information acquiring unit configured to acquire luminance information items about corresponding regions of at least two of a plurality of images which differ in unclearness and which have been formed by the light that has passed through at least one part of the optical system; a control unit configured to control a state of at least one of the optical system and the luminance-information acquiring unit in accordance with an input command value; a spread-parameter calculating unit configured to calculate a spread parameter from a plurality of luminance information items acquired by the luminance-information acquiring unit; a storage unit configured to store a table that shows a relation between spread parameters and command values supplied to the control unit to acquire a focused image of the object, and information that designates a command value corresponding to a point on one of an approximated curve and an approximate line showing the relation that the spread parameter has with the command values, the spread parameter having a minimum absolute value at the point; and a command-outputting unit configured to output the command value to the control unit in order to acquire a focused image of the object, by using the spread parameter calculated by the spread-parameter calculating unit and the table stored in the storage unit, at least one of the luminance information items acquired by the luminance-information acquiring unit having been acquired under a specific condition established by inputting to the control unit the command value corresponding to the point at which the spread parameter designated on the basis of the information stored in the storage unit has the minimum absolute value. 17. A method of acquiring focusing information, comprising: acquiring luminance information items about corresponding regions of at least two of a plurality of images which differ in unclearness and which have been formed by light that has passed through at least one part of an optical system which focuses light coming from an object, at a predetermined position, in order to photograph the object and acquire an focused image of the object; calculating a spread parameter from a plurality of luminance information items thus acquired; storing beforehand a table that shows a relation between spread parameters and command values supplied to a control unit to acquire a focused image of the object, and information that designates a command value corresponding to an inflection point on an approximated curve showing the relation that the spread parameters have with the command values, the control unit being configured to control a state of at least one of the optical system and the acquiring luminance information items, in accordance with an input command value; and outputting the command value to the control unit in order to acquire a focused image of the object, by using the spread parameter thus calculated and the table stored beforehand, at least one of the luminance information items acquired in the acquiring luminance information items being an item acquired under a specific condition established by inputting to the control unit the command value corresponding to the inflection point that is designated on the basis of the information stored beforehand. 18. A method of acquiring focusing information, comprising: acquiring luminance information items about corresponding regions of at least two of a plurality of images which differ in unclearness and which have been formed by light that has passed through at least one part of an optical system which focuses light coming from an object, at a predetermined position, in order to photograph the object and acquire an focused image of the object; calculating a spread parameter from a plurality of luminance information items thus acquired; storing beforehand a table that shows a relation between spread parameters and command values supplied to a control unit to acquire a focused image of the object, and information that designates a command value corresponding to a point on one of an approximated curve and an approximate line showing the relation that the spread parameters have with the command values, the spread parameter having a minimum absolute value at the point, and the control unit being configured to control a state of at least one of the optical system and the acquiring luminance information items, in accordance with an input command value; and outputting the command value to the control unit in order to acquire a focused image of the object, by using the spread parameter thus calculated and the table stored beforehand, at least one of the luminance information items acquired in the acquiring the luminance information items having been acquired under a specific condition established by inputting to the control unit the command value corresponding to the point at which the spread parameter designated on the basis of the information stored beforehand has the minimum absolute value.
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