CN101883219B - Image correcting method and image processing system using same - Google Patents
Image correcting method and image processing system using same Download PDFInfo
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- CN101883219B CN101883219B CN200910137800.7A CN200910137800A CN101883219B CN 101883219 B CN101883219 B CN 101883219B CN 200910137800 A CN200910137800 A CN 200910137800A CN 101883219 B CN101883219 B CN 101883219B
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Abstract
The invention provides an image correcting method and an image processing system using the same. The image correcting method comprises the following steps: (a) sensing a target pixel of a sensed column in an effective pixel area of an image sensor to generate at least one target pixel value; (b) at the same point-in-time of executing the step (a), sensing at least one reference pixel in a shielded area of the image sensor to generate a corrected value, wherein the reference pixel and the sensed column do not belong to one column; and (c) referring to the corrected value for correcting and outputting the target pixel value. By positioning the sensed column and the reference pixel in different columns, the maneuverability of the system is increased. Also, the original hardware architecture can be used without adding extra hardware cost.
Description
Technical field
The present invention, relevant for the image processing system of method for correcting image and use the method, is particularly to not use the pixel of same row to be used as the method for correcting image of reference pixel and the image processing system of use the method.
Background technology
Generally speaking, in image processing system, can have an image sensor (for example charge coupled cell, Charge-coupled Device, CCD) in order to sensing from the incident light of object and incident light quantity is changed into the quantity of electric charge.
Fig. 1 has illustrated the image sensor 100 of known technology.As shown in Figure 1, image sensor 100 comprises a pel array (pixel array) 101 and one row sensing circuit 103.Pel array 101 comprises an original shielded area 107, effective pixel region 105, conventionally.And in some image sensor, can more comprise one with reference to shielded area 108.Row sensing circuit 103 is for the pixel of sensing effective pixel region 105, and its sensing mode is all pixels of sensing one sensing row, all pixels in sensing row 109 or 100 for example, more one by one by the pixel value output of sensing.Reference pixel district (or being called black pixel region, black pixel) 111 and 112 is to proofread and correct the pixel value that sensing row 109 or 100 are sensed.Its reason is all may the have powerful connections existence of noise of each image, so pixel value of sensing reference shielded area 108, just can learn background noise and obtain a corrected value, then with this corrected value, proofread and correct the pixel value (for example: export again after deducting corrected value with the pixel value of the sensing row 109 that sense or 100) of output.
Yet such mechanism only can be with proofreading and correct the row that sense with the sensed identical reference shielded area of row, more nonelastic in circuit design.
Summary of the invention
An object of the present invention is to provide method for correcting image and uses the image processing system of the method, its can use with sensing row not the shielded area of same row as with reference to pixel region.
Embodiments of the invention have disclosed a kind of method for correcting image, and the object pixel of wherein sensing row of an effective pixel region that comprises (a) sensing one image sensor is to produce at least one target pixel value; (b) at the same time point of execution step (a), at least one reference pixel of a shielded area of image sensor is to produce a correction value described in sensing, and wherein said reference pixel and described sensing row do not belong to same row; And (c) proofread and correct described target pixel value with reference to described correction value.
Another embodiment of the present invention has disclosed a kind of image processing system, comprises a pel array, a row sensor and a computing unit.Pel array has an effective pixel region, and it has many sensing row, and a shielded area.Row sensor is listed as the object pixel of one of them to produce at least one target pixel value in order to these sensings described in sensing, and at these sensings described in sensing, being listed as the same time point of one of them, at least one reference pixel of shielded area is to produce a reference pixel value described in sensing.Wherein said reference pixel and described sensing row do not belong to same row.Computing unit, produces described correction value and proofreaies and correct described target pixel value with reference to described correction value according to reference pixel value.
According to the above embodiments, can allow sensing row not be positioned at same listing with the row at reference pixel place, to increase the handlability of system.And, can utilize original hardware structure, must not increase extra hardware cost.
Accompanying drawing explanation
Fig. 1 has illustrated the image sensor of known technology.
Fig. 2 has illustrated according to the schematic diagram of the method for correcting image of the first embodiment of the present invention.
Fig. 3 has illustrated according to the flow chart of the method for correcting image of the first embodiment of the present invention.
Fig. 4 has illustrated the schematic diagram of method for correcting image according to a second embodiment of the present invention.
Fig. 5 has illustrated the flow chart of method for correcting image according to a second embodiment of the present invention.
Drawing reference numeral
200,400 image sensors
201,203,205,401,405 shielded areas
207,209,403,407 sensing row
211,409 effective pixel regions
221,421 computing units
Embodiment
In the middle of specification and claim scope, used some vocabulary to censure specific element.Person with usual knowledge in their respective areas should understand, and hardware manufacturer may be called same element with different nouns.In the whole text, in the middle of specification and follow-up claims, be an open term mentioned " comprising ", therefore should be construed to " comprise but be not limited to ".
Fig. 2 has illustrated according to the schematic diagram of the method for correcting image of the first embodiment of the present invention.In this example, be a selected fixing shielded area as for example, with reference to pixel region (shielded area 201,203 and 205), and non-selection with the shielded area of sensing row 207 and 209 same row as with reference to pixel region.Take so machine-processed reason to be: the background noise in image is relevant with time point.Therefore, so long as point at one time, no matter where pixel is positioned at, all can have identical background noise.Therefore can select any fixing shielded area as with reference to pixel region.So can increase the elasticity in system employs
The flowcharting of the method for correcting image of the first embodiment of the present invention shown in Fig. 2 shown in can Fig. 3.Fig. 3 comprises step 301,303 and 305.The object pixel of wherein sensing row (207 or 209) of one effective pixel region (211) of step 301 sensing one image sensor (200) is to produce at least one target pixel value.Step 303 is at execution step 301 same time point, at least one reference pixel of a shielded area (213) of sensing image sensor (200), and wherein said reference pixel and described object pixel do not belong to same row.In this embodiment, step 303 is fixed area for sensing shielded area (213).Step 305 produces a correction value and carrys out correction target pixel value with reference to correction value.
Fig. 4 has illustrated the schematic diagram of method for correcting image according to a second embodiment of the present invention.In Ci Lizhong， reference pixel district, be not a fixing region, be selected as the shielded area 401,405 in reference pixel district, the row at its place are less than respectively sensed row 403 and 407 1 row.That is to say, if sensing row 403 are to be N row, corresponding shielded area 401 is N-1 row, if sensing row 407 are M row, corresponding shielded area 405 is M-1 row.Under this mechanism, not only can improve the shortcoming that known technology Zhong， reference pixel district palpus and sensing are listed in same row.It is noted that, row and sensing row that this embodiment is not limited to place, reference pixel district differ row, more than the row at place, reference pixel district can differ row with sensing row, namely, the row at place, reference pixel district and sensing row can have a particular kind of relationship, and in this embodiment, this particular kind of relationship is that row and the sensing row at place, reference pixel district differ row.
The flowcharting of the method for correcting image of the second embodiment of the present invention shown in Fig. 4 shown in can Fig. 5.Fig. 5 comprises step 501,503 and 505.The object pixel of wherein sensing row (403 or 407) of one effective pixel region (409) of step 501 sensing one image sensor (400) is to produce at least one target pixel value.Step 503 is at the same time point of execution step 501, and at least one reference pixel of a shielded area (411) of sensing image sensor (400) is to produce a correction value, and wherein reference pixel and described object pixel do not belong to same row.In this embodiment, in step 503 sensing shielded area 411, there is at least one reference pixel of a specific region of a particular kind of relationship with the row of step 501 sensing.In one embodiment, place, specific region classify N row as, and in step 501 institute's sensing classify N+X row as, wherein N and X are more than or equal to 1 positive integer, that is the row at place, specific region and the row of sensing differ row or more than).Step 505 produces correction value according to reference pixel, and with reference to correction value correction target pixel value.
And in the above-described embodiments, the mean value that can calculate the pixel value of reference pixel is usingd as correction value.Or, can get rid of after the maximum and minimum value of reference pixel value, the mean value that calculates the pixel value of remaining reference pixel is usingd as correction value.It is noted that and how according to the calculated for pixel values of reference pixel, to go out correction value when being known by knowing the personnel of technique, be not limited to above-mentioned computational methods.And in the above-described embodiments, step 305 and 505 can be implemented by a computing unit, computing unit 221 as shown in Figure 2 and the computing unit 421 shown in Fig. 4. Computing unit 221 and 421 can be integrated in row sensing circuit 220 and 420, but can also be independent of outside sensing circuit 220 and 420.
According to the above embodiments, can allow sensing row not be positioned at same listing with the row at reference pixel place, to increase the handlability of system.And, can utilize original hardware structure, must not increase extra hardware cost.
The foregoing is only preferred embodiment of the present invention, all equalizations of doing according to the claims in the present invention scope change and modify, and all should belong to covering scope of the present invention.
Claims (8)
1. a method for correcting image, it is characterized in that, in order to proofread and correct the image by an image sensor sensing, this image sensor has a pel array, this pel array comprises an effective pixel region and a shielded area, wherein this effective pixel region comprises at least one object pixel and this shielded area comprises at least one reference pixel, and wherein each row of this pel array have comprised at least one this object pixel and at least one this reference pixel, and this method for correcting image comprises:
(a) at least one this object pixel of sensing is to produce at least one target pixel value;
(b) at the same time point of execution step (a), at least one this reference pixel of sensing to be to produce a correction value, wherein said reference pixel and do not belong to same row in this sensed object pixel of same time; And
(c) with reference to described correction value, proofread and correct and export described target pixel value;
Wherein when this step (a) and this step (b) are implemented, this reference pixel is positioned at N row, and this object pixel of institute sensing is positioned at N+X row in this step (a), wherein N is more than or equal to 1 positive integer, and described X one is more than or equal to 1 positive integer.
2. method for correcting image as claimed in claim 1, it is characterized in that, described shielded area has a plurality of regions, and described in described step (b) sensing, a wherein fixed area in described these regions of shielded area gives to produce described correction value those object pixels be arranged in different lines.
3. method for correcting image as claimed in claim 1, is characterized in that, the pixel value of a plurality of reference pixels of shielded area described in described step (b) sensing, and the mean value that calculates the pixel value of described these reference pixels is usingd as described correction value.
4. method for correcting image as claimed in claim 3, it is characterized in that, described method more comprises maximum and the minimum value of getting rid of described these reference pixel values, and the mean value that then calculates the pixel value of remaining described these reference pixels is usingd as described correction value.
5. an image processing system, is characterized in that, described system comprises:
One pel array, has:
One effective pixel region, has at least one object pixel; And
One shielded area, comprises at least one reference pixel;
Wherein each row of this pel array comprise at least one this object pixel and at least one this reference pixel;
One row sensor, in order at least one this object pixel of sensing to produce at least one target pixel value, and at the same time point of object pixel described in sensing, at least one this reference pixel of sensing is to produce a reference pixel value, wherein this reference pixel and this object pixel in same time point sensing do not belong to same row, wherein when this row sensor is during in same this reference pixel of time point sensing and this object pixel, the N that classifies as at this reference pixel place is listed as, and this object pixel encloses in N+X and is listed as, wherein N is more than or equal to 1 positive integer, and X one is more than or equal to 1 positive integer, and
One computing unit, produces correction value and proofreaies and correct described target pixel value with reference to described correction value according to described reference pixel value.
6. image processing system as claimed in claim 5, is characterized in that, described shielded area has multizone, and described in described row sensor sensing described these regions of shielded area a wherein fixed area to produce described correction value.
7. image processing system as claimed in claim 5, is characterized in that, described in described computing unit calculates, the mean value of the pixel value of these reference pixels is usingd as described correction value.
8. image processing system as claimed in claim 7, it is characterized in that, described computing unit is got rid of maximum and the minimum value of described these reference pixel values, and the mean value that then calculates the pixel value of remaining described these reference pixels is usingd as described correction value.
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Citations (4)
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| US5153421A (en) * | 1991-11-04 | 1992-10-06 | Xerox Corporation | Architecture for analog and digital image sensor arrays |
| US5521639A (en) * | 1992-04-30 | 1996-05-28 | Sony Corporation | Solid-state imaging apparatus including a reference pixel in the optically-black region |
| EP1237353A1 (en) * | 2001-02-09 | 2002-09-04 | Eastman Kodak Company | An image sensor having black pixels disposed in a spaced-apart relationship from the active pixels |
| US6914627B1 (en) * | 1998-05-27 | 2005-07-05 | Omnivision Technologies, Inc. | Method and apparatus for digital column fixed pattern noise canceling for a CMOS image sensor |
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2009
- 2009-05-07 CN CN200910137800.7A patent/CN101883219B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5153421A (en) * | 1991-11-04 | 1992-10-06 | Xerox Corporation | Architecture for analog and digital image sensor arrays |
| US5521639A (en) * | 1992-04-30 | 1996-05-28 | Sony Corporation | Solid-state imaging apparatus including a reference pixel in the optically-black region |
| US6914627B1 (en) * | 1998-05-27 | 2005-07-05 | Omnivision Technologies, Inc. | Method and apparatus for digital column fixed pattern noise canceling for a CMOS image sensor |
| EP1237353A1 (en) * | 2001-02-09 | 2002-09-04 | Eastman Kodak Company | An image sensor having black pixels disposed in a spaced-apart relationship from the active pixels |
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| CN101883219A (en) | 2010-11-10 |
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