CN101557455B - Method for compensating image data illumination and paper feeding type scanning device applying same - Google Patents
Method for compensating image data illumination and paper feeding type scanning device applying same Download PDFInfo
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- CN101557455B CN101557455B CN2008100886731A CN200810088673A CN101557455B CN 101557455 B CN101557455 B CN 101557455B CN 2008100886731 A CN2008100886731 A CN 2008100886731A CN 200810088673 A CN200810088673 A CN 200810088673A CN 101557455 B CN101557455 B CN 101557455B
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Abstract
The invention provides a method for compensating image data brightness and a paper feeding type scanning device applying the same, which detect the brightness change of a reference background plate to determine a compensating brightness gain value of a next file before and after a file passes through a scanning work zone; the method for compensating image data brightness comprises the following steps: detecting a first reference brightness value B1; extracting first image data D1; detecting a second first reference brightness value B2; obtaining a first brightness difference ratio R1 according to the first reference brightness value B1 and the second first reference brightness value B2; extracting second image data D2; supplementing the second image data D2 through a first brightness gain value G1 by the paper feeding type scanning device when the first brightness difference ratio R1 is less than a predetermined value, and supplementing the second image data D2 through a second brightness gain value G2 by the paper feeding type scanning device when the first brightness difference ratio R1 is not less than a predetermined value. The invention can enable the paper feeding type scanning device to immediately carry out file feeding and scanning work after being started.
Description
Technical field
The present invention is relevant for a kind of method of compensating image data illumination, be particularly to a kind of be applied in the paper feedback scanning device and can be under the situation of start initial stage lighting tube brightness deficiency the method for compensating image data illumination, to reduce the time that the user waits for the fluorescent tube warming-up.
Background technology
Common paper feedback scanning device, for example dispose scanner, multifunctional paper feeding machine or the photocopier etc. of automatic paper feeder, become document treatment facility important in office space or the individual family, the user is as long as be placed on file in the feeding box (groove) of paper feedback scanning device, paper feedback scanning device will be with file feed-in in regular turn, and produces view data electronics shelves or direct output file hard copy behind the image that reads on the file.
But, when the user starts paper feedback scanning device and desires to carry out file when scanning, because the fluorescent tube that is adopted in the paper feedback scanning device must could be exported lightness stabilized light after after a while, thereby causes paper feedback scanning device can't carry out the disappearance of presenting of file and scanning motion immediately.
Therefore, how to allow the user after starting paper feedback scanning device, paper feedback scanning device just can carry out presenting and scanning work of file immediately, has become the important problem of industry.
Summary of the invention
The object of the present invention is to provide the paper feedback scanning device that can carry out file feed and scanning work after a kind of start immediately.
Another object of the present invention is to provide a kind of method of compensating image data illumination and be applied to paper feedback scanning device, the view data that makes paper feedback scanning device be produced at the start initial stage obtains the appropriate brightness compensation.
In a preferred embodiment, the invention provides a kind of method of compensating image data illumination, it is applied to paper feedback scanning device, this paper feedback scanning device is in order to scan at least one first file and one second file, and this paper feedback scanning device comprises scanning operation district, image extraction module and reference background sheet, and image extraction module and reference background sheet are oppositely arranged on the both sides in scanning operation district, the method of compensating image data illumination comprises: when this first file does not enter this scanning operation district, detect the first reference brightness value B
1, the first reference brightness value B
1Detect the brightness of reference background sheet and obtain by the image extraction module; Extract the first view data D
1, the first view data D
1This first file that is read by the scanning operation district by the image extraction module obtains, and paper feedback scanning device is with first a default luminance gain value G
1Compensate the first view data D
1By this scanning operation district but this second file does not enter the neutral gear in this scanning operation district, detect the second reference brightness value B in this first file
2, the second reference brightness value B
2Detect the brightness of reference background sheet and obtain by the image extraction module; According to the first reference brightness value B
1And the second reference brightness value B
2Compare R and obtain first luminance difference
1, wherein,
Extract the second view data D
2, the second view data D
2This second file that is read by the scanning operation district by the image extraction module obtains; And work as first luminance difference and compare R
1During less than preset value, paper feedback scanning device is with the first luminance gain value G
1Compensate the second view data D
2, when first luminance difference compares R
1During more than or equal to preset value, paper feedback scanning device is with the second luminance gain value G
2Compensate the second view data D
2, wherein,
In the method for the compensating image data illumination that preferred embodiment provided, also be included in paper feedback scanning device with the first luminance gain value G
1Compensate the first view data D
1After, output first is compensating image data CD
1, wherein,
CD
1＝G
1×D
1。
In the method for the compensating image data illumination that preferred embodiment provided, also be included in paper feedback scanning device with the first luminance gain value G
1Compensate the second view data D
2After, output second is compensating image data CD
2, wherein,
CD
2＝G
1×D
2。
In the method for the compensating image data illumination that preferred embodiment provided, also be included in paper feedback scanning device with the second luminance gain value G
2Compensate the second view data D
2After, output second is compensating image data CD
2, wherein,
CD
2＝G
2×D
2。
In the method for the compensating image data illumination that preferred embodiment provided, preset value is optional certainly less than 0.1 and more than or equal to the numerical value in 0.02 scope.
In the method for the compensating image data illumination that preferred embodiment provided, paper feedback scanning device is the scanner that disposes automatic paper feeder.
In the method for the compensating image data illumination that preferred embodiment provided, paper feedback scanning device is the multifunctional paper feeding machine that disposes automatic paper feeder.
In the method for the compensating image data illumination that preferred embodiment provided, paper feedback scanning device is the photocopier that disposes automatic paper feeder.
In a preferred embodiment, the invention provides a kind of paper feedback scanning device, produce compensating image data after extracting the image at least two files, at least two files comprise first file and second file.Paper feedback scanning device comprises: the scanning operation district; The image extraction module is arranged at the side in scanning operation district, in order to read by producing the first view data D behind first file in scanning operation district
1And in order to read by producing the second view data D behind second file in scanning operation district
2The reference background sheet is arranged at the opposite side in scanning operation district; And the paper feed movement, in order to be orderly sent to few two files by the scanning operation district, at least two files comprise first file and second file; Wherein, the image extraction module does not detect the brightness of reference background sheet and obtains the first reference brightness value B when first file enters the scanning operation district
1, and at first file by the scanning operation district but second file does not enter the neutral gear in scanning operation district, detect the brightness of reference background sheet and obtain the second reference brightness value B
2, and paper feedback scanning device is with the first reference brightness value B
1And the second reference brightness value B
2Between luminance difference determine the second view data D than R
2The luminance compensation yield value; Wherein, the first reference brightness value B
1, the second reference brightness value B
2And luminance difference than the pass between the R three is:
In the paper feedback scanning device that preferred embodiment provided, paper feedback scanning device is with the first luminance gain value G
1Compensate the first view data D
1Back output first is compensating image data CD
1, and when luminance difference than R during less than preset value, paper feedback scanning device is with the first luminance gain value G
1Compensate the second view data D
2Back output second is compensating image data CD
2, wherein, the first compensating image data CD
1With the first view data D
1Between the pass be:
CD
1＝G
1×D
1，
And the second compensating image data CD
2With the second view data D
2Between the pass be:
CD
2＝G
1×D
2。
In the paper feedback scanning device that preferred embodiment provided, paper feedback scanning device is with the first luminance gain value G
1Compensate the first view data D
1Back output first is compensating image data CD1, and when luminance difference than R during more than or equal to preset value, paper feedback scanning device is with the second luminance gain value G
2Compensate the second view data D
2Back output second is compensating image data CD
2, wherein, the first compensating image data CD
1With the first view data D
1Between the pass be:
CD
1＝G
1×D
1，
Pass between the second luminance gain value and the first luminance gain value is:
The second compensating image data CD
2With the second view data D
2Between the pass be:
CD
2＝G
2×D
2。
In the paper feedback scanning device that preferred embodiment provided, preset value is optional certainly less than 0.1 and more than or equal to the numerical value in 0.02 scope.
In the paper feedback scanning device that preferred embodiment provided, the reference background sheet is the diapire of paper feed movement.
In the paper feedback scanning device that preferred embodiment provided, the reference background sheet is arranged on the bottom of paper feed movement.
In the paper feedback scanning device that preferred embodiment provided, the reference background sheet is a paper-pressing sheet.
In the paper feedback scanning device that preferred embodiment provided, paper feedback scanning device is the scanner that disposes automatic paper feeder.
In the paper feedback scanning device that preferred embodiment provided, paper feedback scanning device is the multifunctional paper feeding machine that disposes automatic paper feeder.
In the paper feedback scanning device that preferred embodiment provided, paper feedback scanning device is the photocopier that disposes automatic paper feeder.
The present invention carries out file feed and scanning work after can allowing paper feedback scanning device start immediately.
Description of drawings
Fig. 1 to Fig. 4 is the composition and the running schematic diagram of paper feedback scanning device that the embodiment of the invention provides;
Fig. 5 A and Fig. 5 B show the schematic diagram when paper feedback scanning device that other embodiment of the present invention is provided adopts different types of reference background sheet; And
Fig. 6 is the flow chart of the method for image data illumination that the embodiment of the invention affords redress.
Wherein, description of reference numerals is as follows:
1 paper feedback scanning device
11 scanning operation districts
12 image extraction modules
121 fluorescent tubes
122 optical elements
123 sensor chips
13 reference background sheets
14 paper feed movements
141 rollers
142 diapires
15 paper-pressing sheets
Embodiment
Provide a kind of paper feedback scanning device 1 according to preferred specific embodiment of the present invention, this paper feedback scanning device 1 can be in order to produce compensating image data behind the image that is extracted into few two files.Fig. 1 to Fig. 4 shows the composition and the running schematic diagram of the paper feedback scanning device 1 that present embodiment provides.At first with reference to Fig. 1, paper feedback scanning device 1 comprises scanning operation district 11, image extraction module 12, reference background sheet 13 and paper feed movement 14.Image extraction module 12, include fluorescent tube 121, optical element 122 and sensor chip 123, wherein, the irradiate light that is produced when fluorescent tube 121 is to object, and optical element 122 can will be sent to sensor chip 123 from the light that object surface reflected and obtain view data.And in the present embodiment, image extraction module 12 and reference background sheet 13 are oppositely arranged on relative both sides, scanning operation district 11, in order to when file during by scanning operation district 11, image extraction module 12 gets final product the image on the extraction document and produces view data, and when file during not by the scanning operation district, but the brightness of 12 sensing reference background plates 13 of image extraction module, the foundation of luminance compensation when producing another view data as the image that extracts next file.In addition, in the present embodiment, paper feed movement 14 includes roller 141 and other actuated element (not shown), in order to be orderly sent to few two files by scanning operation district 11.
And can be in regular turn referring to figs. 1 through Fig. 4 about the operation principles of the paper feedback scanning device 1 that present embodiment provided.At first with reference to Fig. 1, after paper feedback scanning device 1 was activated, paper feed movement 14 was presented the first file S immediately in regular turn
1And the second file S
2, image extraction module 12 then can be at the first file S
1Do not detect the brightness of reference background sheet 13 when entering scanning operation district 11 as yet and obtain the first reference brightness value B
1Then with reference to Fig. 2, as the first file S
1Be transmitted and during by scanning operation district 11, image extraction module 12 promptly can read the first file S
1On image after produce the first view data D
1At this moment, paper feedback scanning device 1 is with the first default luminance gain value G
1Compensate the first view data D
1Back output first is compensating image data CD
1, wherein,
CD
1＝G
1×D
1。
Then refer to Fig. 3 and Fig. 4, as the first file S
1Passed through this scanning operation district 11 as shown in Figure 3 but the second file S
2Do not enter the neutral gear in scanning operation district 11 as yet, image extraction module 12 detects the brightness of reference background sheet 13 and obtains the second reference brightness value B
2, and as the second file S
2During as shown in Figure 4 by scanning operation district 11, image extraction module 12 promptly reads the second file S
2On image after produce the second view data D
2So far, paper feedback scanning device 1 can be with the first reference brightness value B
1And the second reference brightness value B
2Between luminance difference determine the second view data D than R
2The luminance compensation yield value.Wherein, the first reference brightness value B
1, the second reference brightness value B
2And luminance difference than the pass between the R three is:
And in the present embodiment, paper feedback scanning device 1 determines the second view data D
2The mode of luminance compensation yield value be:
(1) during less than preset value, represents the first reference brightness value B than R when luminance difference
1With the second reference brightness value B
2Between brightness change and to tend towards stability, the brightness of fluorescent tube 121 just tends towards stability, therefore, paper feedback scanning device 1 is still with the first luminance gain value G
1Compensate the second view data D
2Back output second is compensating image data CD
2, wherein, the second compensating image data CD
2With the second view data D
2Between the pass be:
CD
2=G
1* D
2And
(2) during more than or equal to preset value, represent the first reference brightness value B than R when luminance difference
1With the second reference brightness value B
2Between brightness change and not tend towards stability as yet, the brightness of fluorescent tube 121 does not just tend towards stability yet, therefore, paper feedback scanning device 1 is with the second luminance gain value G
2Compensate the second view data D
2Back output second is compensating image data CD
2, wherein, the pass between the second luminance gain value and the first luminance gain value is:
And the second compensating image data CD
2With the second view data D
2Between the pass be:
CD
2＝G
2×D
2。
In the paper feedback scanning device 1 that is provided in the present invention, preset value is optional certainly less than 0.1 and more than or equal to the numerical value in 0.02 scope, look closely the paper feedback scanning device 1 of different size and decide, the preset value that all paper feedback scanning devices 1 are adopted is more little, represents paper feedback scanning device 1 high more for the requirement of the luminance errors of each output image data.
Referring to figs. 1 through Fig. 4, in the present embodiment, paper feedback scanning device 1 is with the first file S
1The brightness that neutral gear by 11 front and back, scanning operation district detects reference background sheet 13 changes and determines the second file S
2The luminance compensation yield value, in like manner, paper feedback scanning device 1 also can continue with the second file S
2The brightness that neutral gear by 11 front and back, scanning operation district detects reference background sheet 13 changes the luminance compensation yield value that determines the 3rd file (not shown).And along with the brightness of fluorescent tube 121 in the paper feedback scanning device 1 levels off to stable, for example when the neutral gear image extraction module 12 of N file by 11 front and back, scanning operation district detected luminance difference less than preset value than R, paper feedback scanning device 1 just can with fixing luminance gain value come for after the image of N+1 file carry out luminance compensation.
In addition, in paper feedback scanning device 1 provided by the present invention, the reference background sheet is except can adopting the reference background sheet 13 that is arranged on paper feed movement 14 bottoms as shown in Figure 1, also the diapire 142 that can directly utilize paper feed movement 14 shown in Fig. 5 A is as the reference background sheet, or adopts the paper-pressing sheet 15 that is arranged on paper feed movement 14 bottoms to be used as the reference background sheet shown in Fig. 5 B.
With reference to Fig. 6, the flow chart of the method for compensating image data illumination provided by the present invention is described.The method of compensating image data illumination is applied to paper feedback scanning device, paper feedback scanning device comprises scanning operation district, image extraction module and reference background sheet, and image extraction module and reference background sheet are oppositely arranged on the both sides in scanning operation district, and the method for compensating image data illumination comprises:
Detect the first reference brightness value B
1, the first reference brightness value B
1Detect the brightness of reference background sheet and obtain by the image extraction module;
Extract the first view data D
1, the first view data D
1First file that is read by the scanning operation district by the image extraction module obtains, and paper feedback scanning device is with the first luminance gain value G
1Compensate the first view data D
1
Detect the second reference brightness value B
2, the second reference brightness value B
2Detect the brightness of reference background sheet and obtain by the image extraction module;
According to the first reference brightness value B
1And the second reference brightness value B
2Compare R and obtain first luminance difference
1, wherein,
Extract the second view data D
2, the second view data D
2Second file that is read by the scanning operation district by the image extraction module obtains; And
When first luminance difference compares R
1During less than preset value P, with the first luminance gain value G
1Compensate the second view data D
2, when first luminance difference compares R
1During more than or equal to preset value P, with the second luminance gain value G
2Compensate the second view data D
2
Continuation is with reference to Fig. 6, the method of image brightness that present embodiment affords redress, determine the luminance compensation yield value of second file by the brightness variation of the front and back reference background sheet in scanning operation district with first file, and after changing more than or equal to preset value, brightness continues to change the luminance compensation yield value that determines the 3rd file with the brightness of second file by the front and back reference background sheet in scanning operation district, up to when the brightness of N file by the front and back reference background sheet in scanning operation district changes less than preset value P, then with fixing luminance gain value G
NCarry out luminance compensation for the later view data of N+1 file.
In the method for compensating image data illumination provided by the present invention, preset value P is optional certainly less than 0.1 and more than or equal to the numerical value in 0.02 scope.
Comprehensive above description can be understood, and paper feedback scanning device provided by the present invention is by in the front and back of a file by the scanning operation district, detects the brightness variation of reference background sheet and determines the luminance compensation value of a back file.And the method by compensating image data illumination provided by the present invention is carried out file feed and scanning work after can allowing paper feedback scanning device be activated immediately, removes the time that the user waits from.
The method of compensating image data illumination provided by the present invention also can be applicable in other paper feedback scanning device except being applied in the scanner that disposes automatic paper feeder, for example disposes in the multifunctional paper feeding machine or photocopier of automatic paper feeder.And paper feedback scanning device provided by the present invention then comprises the scanner, the multifunctional paper feeding machine that dispose automatic paper feeder, or photocopier etc.
The above is the preferred embodiments of the present invention only, is not in order to limiting scope of the present invention, and therefore all other do not break away from the equivalence of being finished under the disclosed spirit and change or modify, and all should be contained in the application's the scope that claims defined.
Claims (19)
1. the method for a compensating image data illumination, be applied to paper feedback scanning device, this paper feedback scanning device is in order to scan at least one first file and one second file, and this paper feedback scanning device comprises scanning operation district, image extraction module and reference background sheet, and this image extraction module and this reference background sheet are oppositely arranged on the both sides in this scanning operation district, and the method for this compensating image data illumination comprises:
When this first file does not enter this scanning operation district, detect the first reference brightness value B
1, this first reference brightness value B
1Detect the brightness of this reference background sheet and obtain by this image extraction module;
Extract the first view data D
1, this first view data D
1This first file that is read by this scanning operation district by this image extraction module obtains, and this paper feedback scanning device is with first a default luminance gain value G
1Compensate this first view data D
1
By this scanning operation district but this second file does not enter the neutral gear in this scanning operation district, detect the second reference brightness value B in this first file
2, this second reference brightness value B
2Detect the brightness of this reference background sheet and obtain by this image extraction module;
According to this first reference brightness value B
1And this second reference brightness value B
2Compare R and obtain first luminance difference
1, wherein,
Extract the second view data D
2, this second view data D
2This second file that is read by this scanning operation district by this image extraction module obtains; And
When this first luminance difference compares R
1During less than preset value, this paper feedback scanning device is with this first luminance gain value G
1Compensate this second view data D
2, when this first luminance difference compares R
1During more than or equal to preset value, this paper feedback scanning device is with the second luminance gain value G
2Compensate this second view data D
2, wherein,
2. the method for compensating image data illumination as claimed in claim 1 also is included in this paper feedback scanning device with this first luminance gain value G
1Compensate this first view data D
1Back output first is compensating image data CD
1, wherein,
CD
1＝G
1×D
1。
3. the method for compensating image data illumination as claimed in claim 1 also is included in this paper feedback scanning device with this first luminance gain value G
1Compensate this second view data D
2Back output second is compensating image data CD
2, wherein,
CD
2＝G
1×D
2。
4. the method for compensating image data illumination as claimed in claim 1 also is included in this paper feedback scanning device with this second luminance gain value G
2Compensate this second view data D
2Back output second is compensating image data CD
2, wherein,
CD
2＝G
2×D
2。
5. the method for compensating image data illumination as claimed in claim 1, wherein, this preset value is optional from less than 0.1 and more than or equal to the numerical value in 0.02 scope.
6. the method for compensating image data illumination as claimed in claim 1, wherein, this paper feedback scanning device is the scanner that disposes automatic paper feeder.
7. the method for compensating image data illumination as claimed in claim 1, wherein, this paper feedback scanning device is the multifunctional paper feeding machine that disposes automatic paper feeder.
8. the method for compensating image data illumination according to claim 1, wherein, this paper feedback scanning device is the photocopier that disposes automatic paper feeder.
9. a paper feedback scanning device produces compensating image data after extracting the image at least two files, and these at least two files comprise first file and second file, and this paper feedback scanning device comprises:
The scanning operation district;
The image extraction module is arranged at the side in this scanning operation district, in order to read by producing the first view data D behind this first file in this scanning operation district
1And in order to read by producing the second view data D behind this second file in this scanning operation district
2
The reference background sheet is arranged at the opposite side in this scanning operation district; And
The paper feed movement, in order to transmit these at least two files in regular turn by this scanning operation district, these at least two files comprise first file and second file;
Wherein, this image extraction module does not detect the brightness of this reference background sheet and obtains the first reference brightness value B when this first file enters this scanning operation district
1, and at this first file by this scanning operation district but this second file does not enter the neutral gear in this scanning operation district, detect the brightness of this reference background sheet and obtain the second reference brightness value B
2, and this paper feedback scanning device is with this first reference brightness value B
1And this second reference brightness value B
2Between luminance difference determine this second view data D than R
2The luminance compensation yield value;
Wherein, this first reference brightness value B
1, this second reference brightness value B
2And this luminance difference than the pass between the R three is:
10. paper feedback scanning device as claimed in claim 9, wherein, this paper feedback scanning device is with the first luminance gain value G
1Compensate this first view data D
1Back output first is compensating image data CD
1, and when this luminance difference than R during less than preset value, this paper feedback scanning device is with this first luminance gain value G
1Compensate this second view data D
2Back output second is compensating image data CD
2, wherein, this first compensating image data CD
1With this first view data D
1Between the pass be:
CD
1＝G
1×D
1，
And this second compensating image data CD
2With this second view data D
2Between the pass be:
CD
2＝G
1×D
2。
11. paper feedback scanning device as claimed in claim 10, wherein, this preset value is optional certainly less than 0.1 and more than or equal to the numerical value in 0.02 scope.
12. paper feedback scanning device as claimed in claim 9, wherein, this paper feedback scanning device is with the first luminance gain value G
1Compensate this first view data D
1Back output first is compensating image data CD1, and when this luminance difference than R during more than or equal to preset value, this paper feedback scanning device is with the second luminance gain value G
2Compensate this second view data D
2Back output second is compensating image data CD
2, wherein, this first compensating image data CD
1With this first view data D
1Between the pass be:
CD
1＝G
1×D
1，
Pass between this second luminance gain value and this first luminance gain value is:
This second compensating image data CD
2With this second view data D
2Between the pass be:
CD
2＝G
2×D
2。
13. paper feedback scanning device as claimed in claim 12, wherein, this preset value is optional certainly less than 0.1 and more than or equal to the numerical value in 0.02 scope.
14. paper feedback scanning device as claimed in claim 9, wherein, this reference background sheet is the diapire of this paper feed movement.
15. paper feedback scanning device as claimed in claim 9, wherein, this reference background sheet is arranged on this paper feed movement bottom.
16. paper feedback scanning device as claimed in claim 9, wherein, this reference background sheet is a paper-pressing sheet.
17. paper feedback scanning device as claimed in claim 9, wherein, this paper feedback scanning device is the scanner that disposes automatic paper feeder.
18. paper feedback scanning device as claimed in claim 9, wherein, this paper feedback scanning device is the multifunctional paper feeding machine that disposes automatic paper feeder.
19. paper feedback scanning device as claimed in claim 9, wherein, this paper feedback scanning device is the photocopier that disposes automatic paper feeder.
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| CN2008100886731A CN101557455B (en) | 2008-04-10 | 2008-04-10 | Method for compensating image data illumination and paper feeding type scanning device applying same |
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| JP5775864B2 (en) * | 2012-12-12 | 2015-09-09 | 京セラドキュメントソリューションズ株式会社 | Scanner device and image forming apparatus |
| CN107147901A (en) * | 2017-05-02 | 2017-09-08 | 深圳怡化电脑股份有限公司 | A kind of sensor calibration method, device, equipment and storage medium |
| CN114898176A (en) * | 2022-05-07 | 2022-08-12 | 厦门美图之家科技有限公司 | Target detection model training method, system, terminal device and storage medium |
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| CN1226685A (en) * | 1998-01-28 | 1999-08-25 | 鸿友科技股份有限公司 | Image brightness error compensation method and device |
| CN1290851A (en) * | 2000-11-03 | 2001-04-11 | 华南理工大学 | Method for measuring and evaluating depth of road surface construction by digital image technology |
| CN1851555A (en) * | 2006-05-19 | 2006-10-25 | 李鹏 | Method for realizing two-dimensional panoramic true imaging |
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2008
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1226685A (en) * | 1998-01-28 | 1999-08-25 | 鸿友科技股份有限公司 | Image brightness error compensation method and device |
| CN1290851A (en) * | 2000-11-03 | 2001-04-11 | 华南理工大学 | Method for measuring and evaluating depth of road surface construction by digital image technology |
| CN1851555A (en) * | 2006-05-19 | 2006-10-25 | 李鹏 | Method for realizing two-dimensional panoramic true imaging |
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| Title |
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| JP特开2005-167855A 2005.06.23 |
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