IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0742462
(2007-04-30)
|
등록번호 |
US-7428010
(2008-09-23)
|
우선권정보 |
JP-2001-183623(2001-06-18); JP-2002-042747(2002-02-20) |
발명자
/ 주소 |
- Nakamura,Yoshiaki
- Mizutani,Yasushi
|
출원인 / 주소 |
|
대리인 / 주소 |
Frishauf, Holtz, Goodman & Chick, P.C.
|
인용정보 |
피인용 횟수 :
2 인용 특허 :
7 |
초록
▼
A photosensor system includes a photosensor array constituted by two dimensionally arraying a plurality of photosensors, an image reading section which reads a subject image at a predetermined image reading sensitivity by using the photosensor array, a sensitivity adjustment image reading section wh
A photosensor system includes a photosensor array constituted by two dimensionally arraying a plurality of photosensors, an image reading section which reads a subject image at a predetermined image reading sensitivity by using the photosensor array, a sensitivity adjustment image reading section which reads a sensitivity adjustment subject image while the image reading sensitivity in the photosensor array is changed to a plurality of stages, an optimal image reading sensitivity deriving section which derives an image reading sensitivity optimal for reading operation of the subject image, on the basis of a pixel data group relating to an image pattern of the subject image read by the sensitivity adjustment image reading section, and an image reading sensitivity setting section which sets the optimal image reading sensitivity as the image reading sensitivity in the image reading section.
대표청구항
▼
What is claimed is: 1. A photosensor system comprising: a photosensor array comprising a plurality of photosensors arrayed two-dimensionally; an image reading section which reads a subject image at a predetermined image reading sensitivity, corresponding to a charge accumulating period, by using th
What is claimed is: 1. A photosensor system comprising: a photosensor array comprising a plurality of photosensors arrayed two-dimensionally; an image reading section which reads a subject image at a predetermined image reading sensitivity, corresponding to a charge accumulating period, by using the photosensor array; sensitivity adjustment image reading means for reading a sensitivity adjustment subject image using a plurality of image reading sensitivities; optimal image reading sensitivity deriving means for deriving an image reading sensitivity optimal for reading the subject image, based on a pixel data group relating to an image pattern of the subject image read by the sensitivity adjustment image reading means; wherein the optimal image reading sensitivity deriving means comprises specific data removal means for removing from the pixel data group specific pixel data including at least pixel data having a maximum or minimum value in the pixel data group, without judging whether or not the specific pixel data is defective, so as to correct the pixel data group, wherein the optimal image reading sensitivity is derived based on the corrected pixel data group; image reading sensitivity setting means for setting the optimal image reading sensitivity as the image reading sensitivity in the image reading section; and reading control means for controlling execution of reading of the subject image, by using the image reading sensitivity set by the image reading sensitivity setting means. 2. A system according to claim 1, wherein: the optimal image reading sensitivity deriving means further comprises image reading sensitivity correction means for correcting only one time a value of the image reading sensitivity optimal for reading the subject image derived based on the pixel data group so that the value increases by a value corresponding to a predetermined period-increase rate so as to correct the image reading sensitivity, wherein the corrected image reading sensitivity is set as the optimal image reading sensitivity; and the image reading sensitivity correction means comprises means for correcting the charge accumulating period corresponding to the image reading sensitivity optimal for reading the subject image to increase the charge accumulating period by a period corresponding to the predetermined period-increase rate. 3. A system according to claim 1, wherein: the optimal image reading sensitivity deriving means further comprises image reading sensitivity correction means for correcting only one time a value of the image reading sensitivity optimal for reading the subject image derived based on the pixel data group so that the value increases by a value corresponding to a predetermined period-increase rate so as to correct the image reading sensitivity, wherein the corrected image reading sensitivity is set as the optimal image reading sensitivity; the optimal image reading sensitivity deriving means comprises standard image reading sensitivity extraction means for extracting a standard image reading sensitivity as the image reading sensitivity optimal for reading the subject image, based on a pixel data group for each of the image reading sensitivities with which the sensitivity adjustment subject image is read by the sensitivity adjustment image reading means; and the image reading sensitivity correction means corrects the value of the standard image reading sensitivity so that the value is increased by the predetermined period-increase rate. 4. A system according to claim 3, wherein the standard image reading sensitivity extraction means comprises: data extraction means for extracting maximum and minimum values from the pixel data group for each said image reading sensitivity; data range calculation means for calculating a data range of the pixel data group for each said image reading sensitivity based on the maximum and minimum values of the pixel data group, and extraction means for extracting the standard image reading sensitivity based on the data range for each said image reading sensitivity. 5. A system according to claim 4, wherein the extraction means extracts as the standard image reading sensitivity an image reading sensitivity having a maximum data range out of data ranges for the respective image reading sensitivities. 6. A system according to claim 1, wherein the optimal image reading sensitivity deriving means further comprises image reading sensitivity correction means for correcting only one time a value of the image reading sensitivity optimal for reading the subject image derived based on the pixel data group so that the value increases by a value corresponding to a predetermined period-increase rate so as to correct the image reading sensitivity, wherein the corrected image reading sensitivity is set as the optimal image reading sensitivity, and wherein the period-increase rate is arbitrarily set from outside the photosensor system. 7. A system according to claim 3, wherein the optimal image reading sensitivity deriving means comprises means for comparing a mean value of the pixel data group at the standard image reading sensitivity with a predetermined reference value, and judges whether correction based on the predetermined period-increase rate should be executed. 8. A system according to claim 7, wherein the reference value corresponds to a median value of a data range of the pixel data group at the standard image reading sensitivity. 9. A system according to claim 7, wherein the reference value is arbitrarily set from outside the photosensor system. 10. A system according to claim 1, wherein the optimal image reading sensitivity deriving means comprises: image reading sensitivity extraction means for extracting an image reading sensitivity suitable for a normal reading operation of the subject image based on the pixel data group from which the specific pixel data has been removed by the specific data removal means, and setting means for setting as the optimal image reading sensitivity the image reading sensitivity extracted by the image reading sensitivity extraction means. 11. A system according to claim 10, wherein the image reading sensitivity extraction means comprises: data extraction means for extracting maximum and minimum values from the pixel data group from which the specific data has been removed for each said image reading sensitivity, data range calculation means for calculating a data range of the pixel data group for each said image reading sensitivity based on the maximum and minimum values of the pixel data group extracted by the data extraction means, and extraction means for extracting an image reading sensitivity having a maximum data range out of data ranges of pixel data groups for the respective image reading sensitivities. 12. A system according to claim 1, wherein the specific data removal means removes a plurality of pixel data sequentially from a maximum value from the pixel data group obtained by the sensitivity adjustment image reading means for each said image reading sensitivity. 13. A system according to claim 1, wherein the specific data removal means removes a plurality of pixel data sequentially from a minimum value from the pixel data group obtained by the sensitivity adjustment image reading means for each said image reading sensitivity. 14. A system according to claim 1, wherein the sensitivity adjustment image reading means reads the sensitivity adjustment subject image only in a detection region set in advance within an effective reading region of the photosensor array. 15. A system according to claim 14, wherein the detection region is set to be a region where the pixel data group from which the specific pixel data has been removed by the specific data removal means contains a minimum number of pixel data necessary to normally execute at least a reading sensitivity setting operation of the image reading sensitivity setting means. 16. A system according to claim 1, wherein a reading operation of the subject image in the sensitivity adjustment image reading means is executed by setting the image reading sensitivities to differ stepwise for a predetermined number of rows in the photosensor array. 17. A system according to claim 1, wherein the sensitivity adjustment image reading means reads the sensitivity adjustment subject image within an entire effective reading region of the photosensor array. 18. A system according to claim 1, wherein the pixel data group includes lightness data corresponding to the image pattern of the subject image. 19. A system according to claim 1, wherein each photosensor comprises source and drain electrodes which are formed on respective sides of a channel layer formed from a semiconductor layer, and first and second gate electrodes which are formed above and below the channel region via insulating films, wherein one of the first and second gate electrodes is set as a light irradiation side, and charges corresponding to an amount of light incident onto the light irradiation side are generated and accumulated in the channel region. 20. A system according to claim 1, wherein the optimal image reading sensitivity deriving means further comprises image reading sensitivity correction means for correcting only one time a value of the image reading sensitivity optimal for reading the subject image derived based on the pixel data group so that the value increases by a value corresponding to a predetermined period-increase rate having a predetermined constant value so as to correct the image reading sensitivity, wherein the corrected image reading sensitivity is set as the optimal image reading sensitivity. 21. A drive control method for a photosensor system which includes a photosensor array comprising a plurality of two-dimensionally arrayed photosensors, and which reads a subject image by using the photosensor array, said method comprising: reading a sensitivity adjustment subject image using a plurality of image reading sensitivities corresponding to respective charge accumulating periods; deriving an image reading sensitivity suitable for reading the subject image based on a pixel data group relating to an image pattern of the subject image read from the sensitivity adjustment subject image; wherein deriving the image reading sensitivity comprises removing from the pixel data group specific pixel data including at least pixel data having a maximum or minimum value in the pixel data group, without judging whether or not the specific pixel data is defective, so as to correct the pixel data group; and setting the derived image reading sensitivity as a reading sensitivity for reading the subject image thereby executing reading of the subject image, by using the image reading sensitivity. 22. A method according to claim 21, wherein: deriving the image reading sensitivity further comprises correcting only one time a value of the image reading sensitivity suitable for reading the subject image derived based on the pixel data group so that the value increases by a value corresponding to a predetermined period-increase rate so as to correct the image reading sensitivity; and correcting the value of the image reading sensitivity suitable for reading the subject image comprises correcting the charge accumulating period corresponding to the image reading sensitivity so as to increase the charge accumulating period by a period corresponding to the predetermined period-increase rate. 23. A method according to claim 21, wherein: deriving the image reading sensitivity further comprises correcting only one time a value of the image reading sensitivity suitable for reading the subject image derived based on the pixel data group so that the value increases by a value corresponding to a predetermined period-increase rate so as to correct the image reading sensitivity; deriving the image reading sensitivity suitable for reading the subject image comprises extracting a standard image reading sensitivity as the image reading sensitivity suitable for reading the subject image, based on a pixel data group for each of the image reading sensitivities used in reading the sensitivity adjustment subject image; and correcting the value of the image reading sensitivity suitable for reading the subject image comprises correcting the value of the standard image reading sensitivity so that the value is increased by the predetermined period-increase rate. 24. A method according to claim 23, wherein extracting the standard image reading sensitivity comprises: extracting maximum and minimum values from the pixel data group for each said image reading sensitivity; calculating a data range of the pixel data group for each said image reading sensitivity based on the maximum and minimum values of the pixel data group, and extracting the standard image reading sensitivity based on the data range for each said image reading sensitivity. 25. A method according to claim 24, wherein extracting the standard image reading sensitivity based on the data ranges comprises comparing data ranges for the respective image reading sensitivities, and extracting as the standard image reading sensitivity an image reading sensitivity having a maximum data range. 26. A method according to claim 21, wherein deriving the image reading sensitivity further comprises correcting only one time a value of the image reading sensitivity suitable for reading the subject image derived based on the pixel data group so that the value increases by a value corresponding to a predetermined period-increase rate so as to correct the image reading sensitivity, and the period-increase rate is arbitrarily set from outside the photosensor system. 27. A method according to claim 23, wherein deriving the image reading sensitivity suitable for reading the subject image comprises comparing a mean value of the pixel data group at the standard image reading sensitivity with a predetermined reference value, and judging whether correction based on the predetermined period-increase rate should be executed. 28. A method according to claim 27, wherein the reference value corresponds to a median value of a data range of the pixel data at the standard image reading sensitivity. 29. A method according to claim 27, wherein the reference value is arbitrarily set from outside the photosensor system. 30. A method according to claim 21, wherein deriving the image reading sensitivity suitable for reading the subject image comprises extracting an image reading sensitivity suitable for a normal reading operation of the subject image based on the pixel data group from which the specific pixel data has been removed. 31. A method according to claim 30, wherein extracting the image reading sensitivity suitable for the normal reading operation of the subject image comprises: extracting maximum and minimum values from the pixel data group from which the specific data has been removed for each said image reading sensitivity, calculating a data range of the pixel data group for each said image reading sensitivity based on the maximum and minimum values of the pixel data group extracted for each said image reading sensitivity, and extracting an image reading sensitivity having a maximum data range out of data ranges of pixel data groups for the respective image reading sensitivities. 32. A method according to claim 21, wherein removing the specific pixel data comprises: comparing sizes of all pixel data contained in the pixel data group for each said image reading sensitivity, and sorting the pixel data; and removing a predetermined number of pixel data from at least one end of a string of the sorted pixel data. 33. A method according to claim 21, wherein removing the specific pixel data comprises repeating a predetermined number of times: comparing sizes of all pixel data contained in the pixel data group for each said image reading sensitivity, and extracting and removing pixel data having a maximum or minimum value. 34. A method according to claim 21, wherein reading the sensitivity adjustment subject image comprises setting the image reading sensitivities to differ stepwise for a predetermined number of rows in the photosensor array. 35. A method according to claim 21, wherein the pixel data group includes lightness data corresponding to the image pattern of the subject image. 36. A method according to claim 21, wherein each photosensor comprises source and drain electrodes which are formed on respective sides of a channel layer formed from a semiconductor layer, and first and second gate electrodes which are formed at least above and below the channel region via insulating films, wherein one of the first and second gate electrodes is set as a light irradiation side, and charges corresponding to an amount of light entering from the light irradiation side are generated and accumulated in the channel region. 37. A method according to claim 21, wherein deriving the image reading sensitivity further comprises correcting only one time a value of the image reading sensitivity suitable for reading the subject image derived based on the pixel data group so that the value increases by a value corresponding to a predetermined period-increase rate having a predetermined constant value so as to correct the image reading sensitivity. 38. A photosensor system comprising: a photosensor array comprising a plurality of photosensors arrayed two-dimensionally; an image reading section which reads a subject image at a predetermined image reading sensitivity, corresponding to a charge accumulating period, by using the photosensor array; sensitivity adjustment image reading means for reading a sensitivity adjustment subject image using a plurality of image reading sensitivities; optimal image reading sensitivity deriving means for deriving an image reading sensitivity optimal for reading the subject image, based on a pixel data group relating to an image pattern of the subject image read by the sensitivity adjustment image reading means; wherein the optimal image reading sensitivity deriving means comprises specific data removal means for removing from the pixel data group specific pixel data including at least pixel data having a maximum or minimum value in the pixel data group so as to correct the pixel data group, wherein the optimal image reading sensitivity is derived based on the corrected pixel data group; image reading sensitivity setting means for setting the optimal image reading sensitivity as the image reading sensitivity in the image reading section; and reading control means for controlling execution of reading of the subject image, by using the image reading sensitivity set by the image reading sensitivity setting means; wherein the optimal image reading sensitivity deriving means further comprises: image reading sensitivity extraction means for extracting an image reading sensitivity suitable for a normal reading operation of the subject image based on the pixel data group from which the specific pixel data has been removed by the specific data removal means; and setting means for setting as the optimal image reading sensitivity the image reading sensitivity extracted by the image reading sensitivity extraction means; and wherein the image reading sensitivity extraction means comprises: data extraction means for extracting maximum and minimum values from the pixel data group from which the specific data has been removed for each said image reading sensitivity; data range calculation means for calculating a data range of the pixel data group for each said image reading sensitivity based on the maximum and minimum values of the pixel data group extracted by the data extraction means; and extraction means for extracting an image reading sensitivity having a maximum data range out of data ranges of pixel data groups for the respective image reading sensitivities. 39. A drive control method for a photosensor system which includes a photosensor array comprising a plurality of two-dimensionally arrayed photosensors, and which reads a subject image by using the photosensor array, said method comprising: reading a sensitivity adjustment subject image using a plurality of image reading sensitivities corresponding to respective charge accumulating periods; deriving an image reading sensitivity suitable for reading the subject image based on a pixel data group relating to an image pattern of the subject image read from the sensitivity adjustment subject image; wherein deriving the image reading sensitivity comprises removing from the pixel data group specific pixel data including at least pixel data having a maximum or minimum value in the pixel data group so as to correct the pixel data group; and setting the derived image reading sensitivity as a reading sensitivity for reading the subject image thereby executing reading of the subject image, by using the image reading sensitivity; wherein deriving the image reading sensitivity suitable for reading the subject image further comprises extracting an image reading sensitivity suitable for a normal reading operation of the subject image based on the pixel data group from which the specific pixel data has been removed; and wherein extracting the image reading sensitivity suitable for the normal reading operation of the subject image comprises: extracting maximum and minimum values from the pixel data group from which the specific data has been removed for each said image reading sensitivity; calculating a data range of the pixel data group for each said image reading sensitivity based on the maximum and minimum values of the pixel data group extracted for each said image reading sensitivity; and extracting an image reading sensitivity having a maximum data range out of data ranges of pixel data groups for the respective image reading sensitivities.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.