IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0400549
(1999-09-21)
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등록번호 |
US-7283163
(2007-10-16)
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우선권정보 |
JP-10-269656(1998-09-24) |
발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
Fitzpatrick, Cella, Harper & Scinto
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인용정보 |
피인용 횟수 :
6 인용 특허 :
13 |
초록
▼
In order to eliminate noises contained in signals output from a photoelectric conversion unit, an image processing apparatus is provided with a photoelectric conversion unit including a pixel and a noise correction unit for correcting noises in a signal output from a pixel in accordance with noise i
In order to eliminate noises contained in signals output from a photoelectric conversion unit, an image processing apparatus is provided with a photoelectric conversion unit including a pixel and a noise correction unit for correcting noises in a signal output from a pixel in accordance with noise information obtained from the pixel during two or more arbitrary different accumulation times.
대표청구항
▼
What is claimed is: 1. An image processing apparatus comprising: a read-out unit which reads out a photoelectric conversion signal accumulated in a pixel during a first accumulation duration, wherein the photoelectric conversion signal includes a first noise component; an operation unit which calcu
What is claimed is: 1. An image processing apparatus comprising: a read-out unit which reads out a photoelectric conversion signal accumulated in a pixel during a first accumulation duration, wherein the photoelectric conversion signal includes a first noise component; an operation unit which calculates a noise correction value corresponding to the first noise component by using a correction value corresponding to a second noise component accumulated in the pixel during a second accumulation duration, and by using a correction value corresponding to a third noise component accumulated in the pixel during a third accumulation duration, wherein said noise correction value is calculated on the basis of changes in the first, second and third accumulation durations, and changes between the first, second and third noise components accumulated in the pixel, and wherein the first, second and third accumulation durations are different from each other; and a correction unit correcting the photoelectric conversion signal using the correction value corresponding to the first noise component, wherein said read-out unit reads out a photoelectric conversion signal accumulated in a pixel during a first accumulation duration in response to a sensor accumulation completion signal from a sensor representing the pixel, and wherein said operation unit calculates a noise correction value corresponding to the first and second noise components by using correction values corresponding to second and third noise components accumulated in the pixel during second and third accumulation durations, which are both set by a timer independently of the sensor accumulation completion signal. 2. An image processing apparatus comprising: a read-out unit which reads out a photoelectric conversion signal accumulated in a pixel during a first accumulation duration, wherein the photoelectric conversion signal includes a first noise component; an operation unit which calculates a noise correction value corresponding to the first noise component by using a correction value corresponding to a second noise component accumulated in the pixel during a second accumulation duration, and by using a correction value corresponding to a third noise component accumulated in the pixel during a third accumulation duration, wherein said noise correction value is calculated on the basis of changes in the first, second and third accumulation durations, and changes between the first, second and third noise components accumulated in the pixel, and wherein the first, second and third accumulation durations are different from each other; and a correction unit correcting the photoelectric conversion signal using the correction value corresponding to the first noise component, wherein the second noise component comprises a fixed pattern noise component whose value is independent of the second accumulation duration and whose correction value is calculated from a value of the photoelectric conversion signal accumulated in the pixel during the second accumulation duration without modifying said value with a value of the second accumulation duration, and wherein the third noise component comprises a dark current noise component whose value is dependent upon the third accumulation duration and whose correction value calculated from a value of the photoelectric conversion signal accumulated in the pixel during the third accumulation duration by modifying the value of the photoelectric conversion signal accumulated in the pixel during the third accumulation duration using the value of the third accumulation duration. 3. An image processing apparatus according to claim 2, wherein said operation unit calculates the noise correction value corresponding to the first noise component by using: a fixed pattern noise correction value, FPN[i,j] for the jth pixel in an ith pixel train, corresponding to a second noise component accumulated in the pixel during a second accumulation duration, and a dark current noise correction value corresponding to a third noise component accumulated in the pixel during a third accumulation duration, wherein the dark current noise correction value for the jth pixel of the ith pixel train is calculated by multiplying dark current correction information for the jth pixel of the ith pixel train, DK[i,j] by the third accumulation duration for the ith pixel train, TM[,I], wherein said noise correction value, AD3[i,j] for the jth pixel of the ith pixel train is computed by first subtracting the fixed pattern noise correction value for the jth pixel of the ith pixel train, FPN [i,j], from the value of the read out photoelectric conversion signal read by said read-out unit for the jth pixel in the ith pixel train to obtain a fixed-pattern-noise-corrected photoelectric conversion signal AD2[i,j], and then subtracting the product of the dark pattern noise correction information for the jth pixel of the ith pixel train, DK[i,j] and the third accumulation duration for the ith pixel train TM[i], from the fixed-pattern-noise-corrected photoelectric conversion signal AD2[i,j] using the following two equations: 4. An image processing apparatus comprising: a read-out unit which reads out a photoelectric conversion signal accumulated in a pixel during a first accumulation duration, wherein the photoelectric conversion signal includes a first noise component; an operation unit which calculates a noise correction value corresponding to the first noise component by using a correction value corresponding to fixed pattern noise of a plurality of pixels, and by using a correction value corresponding to a second noise component accumulated in the pixel during a second accumulation duration, wherein said noise correction value is calculated on the basis of changes between the first and second accumulation durations, and changes in the first and second noise components accumulated in the pixel and wherein the first and second accumulation durations are different from each other; and a correction unit correcting the photoelectric conversion signal using the correction value corresponding to the first noise component, wherein said read-out unit reads out a photoelectric conversion signal accumulated in a pixel during a first accumulation duration in response to a sensor accumulation completion signal from a sensor representing the pixel, and wherein said operation unit calculates a noise correction value corresponding to the first and second noise components by using a correction value corresponding to the second noise component accumulated in the pixel during second accumulation duration, which is set by a timer independently of the sensor accumulation completion signal. 5. An image processing apparatus comprising: a read-out unit which reads out a photoelectric conversion signal accumulated in a pixel during a first accumulation duration, wherein the photoelectric conversion signal includes a first noise component; an operation unit which calculates a noise correction value corresponding to the first noise component by using a correction value corresponding to fixed pattern noise of a plurality of pixels, and by using a correction value corresponding to a second noise component accumulated in the pixel during a second accumulation duration, wherein said noise correction value is calculated on the basis of changes between the first and second accumulation durations, and changes in the first and second noise components accumulated in the pixel and wherein the first and second accumulation durations are different from each other; and a correction unit correcting the photoelectric conversion signal using the correction value corresponding to the first noise component, wherein the fixed pattern noise has a value that is independent of the accumulation duration associated with its measurement, wherein the correction value corresponding to the fixed pattern noise is calculated from a value of the photoelectric conversion signal accumulated in the pixel during the accumulation duration associated with the measurement of the fixed pattern noise without modifying said value with a value of its associated accumulation duration, and wherein the second noise component comprises a dark current noise component whose value is dependent upon the second accumulation duration and whose correction value calculated from a value of the photoelectric conversion signal accumulated in the pixel during the second accumulation duration by modifying the value of the photoelectric conversion signal accumulated in the pixel during the second accumulation duration using the value of the second accumulation duration. 6. An image processing apparatus according to claim 5, wherein said operation unit calculates the noise correction value corresponding to the first noise component by using: a fixed pattern noise correction value, FPN[i,j] for the jth pixel in an ith pixel train, which is accumulated in the pixel its associated accumulation duration, and a dark current noise correction value corresponding to the second noise component accumulated in the pixel during the second accumulation duration, wherein the dark current noise correction value for the jth pixel of the ith pixel train is calculated by multiplying dark current correction information for the jth pixel of the ith pixel train, DK[i,j] by the second accumulation duration for the ith pixel train, TM[,I], wherein said noise correction value, AD3[i,j] for the jth pixel of the ith pixel train is computed by first subtracting the fixed pattern noise correction value for the jth pixel of the ith pixel train, FPN [i,j], from the value of the read out photoelectric conversion signal read by said read-out unit for the jth pixel in the ith pixel train to obtain a fixed-pattern-noise-corrected photoelectric conversion signal AD2[i,j], and then subtracting the product of the dark pattern noise correction information for the jth pixel of the ith pixel train, DK [i,j] and the second accumulation duration for the ith pixel train TM[i], from the fixed-pattern-noise-corrected photoelectric conversion signal AD2[i,j] using the following two equations:
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