CN1471300A - Image correctino method capable of avoiding error image - Google Patents
Image correctino method capable of avoiding error image Download PDFInfo
- Publication number
- CN1471300A CN1471300A CNA021407983A CN02140798A CN1471300A CN 1471300 A CN1471300 A CN 1471300A CN A021407983 A CNA021407983 A CN A021407983A CN 02140798 A CN02140798 A CN 02140798A CN 1471300 A CN1471300 A CN 1471300A
- Authority
- CN
- China
- Prior art keywords
- image
- correcting
- digital signal
- original text
- avoiding error
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Images
Abstract
The invention is applicable to black and white dipolar. When black correction is carried out, rear bits in scanned digital signal is only fetched. When white correction is carried out, the front bits in scanned digital signal is only fetched, and the most significant digit in the scanned digital signal is filled by one. Thus, the phenomenon of vertical stripe on the scanned image caused by speck or dirt point on calibration paper is prevented. Moreover, lesser bits taken from scanned digital signal decrease quantity of storage.
Description
Technical field
The invention relates to a kind of method for correcting image, and particularly relevant for a kind of method for correcting image of avoiding error image.
Background technology
Scanner is a kind of a kind of machine between photocopier and camera.In the past because expensive price almost is some patents as particular job persons such as artistic workings.In recent years,, squeezed into the main flow of pc world finally, become the senior general of personal computer enclosure equipment because the price that strong competition the caused downslide in scanner market is added in advancing by leaps and bounds of computer technology.
Scanner can be distinguished into some kinds of forms according to its price or function, and general scanner approximately can be distinguished into handly scanner, paper feeding scanner, business card scanner, negative film scanner and falt bed scanner etc. basically.Wherein, the similar glass platform of falt bed scanner is that file or pattern are placed on the flat glass, is moved by transducer and data are read in.Because its structure is can be too complicated, and also difficulty not too of using method, add the function extendibility that it has height, therefore become the arrange in pairs or groups main flow of scanner of computer user now.
Basically, scanner can color be divided into black and white and two kinds of colours.And distinguish in the mode of scanning, can divide into two kinds of the scan modes of reflection scan mode of original text and transmission original text.Next the basic block diagram of color scanner will be described with the scan mode of reflection original text.Please refer to Fig. 1, it is the basic block diagram of color scanner 10.Color scanner 10 comprises fluorescent tube 102, optical system 104, charge coupled cell (CCD) 106 and analog/digital converter 108.The function of the each several part of color scanner 10 will be described below.
The function of charge coupled cell 106 is that the luminous intensity of institute's sensing is utilized opto-electronic conversion and converted photoelectric current to, is stored in storage electrode then and is transformed into signal charge, converts different potential differences again to.
The function of analog/digital converter 108 is that the analog signal conversion in the charge coupled cell 106 is become digital signal, is sent to computer 116 then.
And scanner is when scanning document or pattern, because the inhomogeneities of fluorescent tube, so need do the action of image compensation usually.Generally speaking, can use the work that original text is done image rectification of proofreading and correct.For example, for the scanning of reflection original text, generally can use the black original text of proofreading and correct to reach the white work that original text is done image rectification of proofreading and correct.If have on the original text should not anything the time but proofread and correct, then can make the image of scanning produce vertical bar line (LBB) phenomenon that should not have.And knownly still do not have a kind of method for correcting image and can avoid this vertical bar line phenomenon.
Summary of the invention
In view of this, the objective of the invention is to propose a kind of method for correcting image of avoiding error image.The present invention is directed to black and white the two poles of the earth characteristic, when carrying out black correction, only get the rear bits in the digital signal that scans gained.And when carrying out white timing, only get the several positions, front in the digital signal of scanning gained, and the most significant digit in this digital signal is filled out is 1.Therefore, can avoid making the image of scanning produce vertical bar line (LBB) phenomenon that should not have because dust or assorted point are arranged on the correction original text.Moreover, because in the digital signal of scanning gained, only get less figure place, therefore also can reduce the demand of memory.
For reaching above-mentioned and other purpose, the present invention proposes a kind of method for correcting image of avoiding error image.The method is used for scanner.The method comprises the following steps: when carrying out black correction, scanning first can be proofreaied and correct first correcting digital signal of original text gained, the rear bits of only getting first correcting digital signal.And, scanning second can be proofreaied and correct second correcting digital signal of original text gained when carrying out white timing, only getting several positions, front of second correcting digital signal and the most significant digit of second correcting digital signal is filled out is 1.
In a preferred embodiment of the present invention, the rear bits of first correcting digital signal is stored in the memory.And memory is a random access memory.
In a preferred embodiment of the present invention, several positions, the front of second correcting digital signal are stored in the memory.And memory is a random access memory.
In a preferred embodiment of the present invention, first proofreaies and correct original text is the black original text of proofreading and correct.
In a preferred embodiment of the present invention, the second correction original text is the white original text of proofreading and correct.
In a preferred embodiment of the present invention, step when carrying out black correction more comprises the following steps: scanning the first correction original text after obtaining the first calibrating optical signal, can obtain the first straightening die analog signal via the capturing images element, via analog/digital converter, be converted to first correcting digital signal again.And the capturing images element is a charge coupled cell.
In a preferred embodiment of the present invention, when the step of carrying out white timing more comprises the following steps: scanning the second correction original text after obtaining the second calibrating optical signal, can obtain the second straightening die analog signal via the capturing images element, via analog/digital converter, be converted to second correcting digital signal again.And the capturing images element is a charge coupled cell.
In sum, the present invention proposes a kind of method for correcting image of avoiding error image.The present invention is directed to black and white the two poles of the earth characteristic, when carrying out black correction, only get the rear bits in the digital signal that scans gained.And when carrying out white timing, only get the several positions, front in the digital signal of scanning gained, and the most significant digit in this digital signal is filled out is 1.Therefore, can avoid making the image of scanning produce vertical bar line (LBB) phenomenon that should not have because dust or assorted point are arranged on the correction original text.Moreover, because in the digital signal of scanning gained, only get less figure place, therefore also can reduce the demand of memory.
Description of drawings
Fig. 1 is the basic block diagram of color scanner; And
Fig. 2 is the flow chart according to the method for correcting image of the error image avoided of a preferred embodiment of the present invention.
10: color scanner
102: fluorescent tube
104: optical system
106: charge coupled cell
108: analog/digital converter
110: file
112: speculum
114: lens
116: computer
S202～s208: the implementation step of a preferred embodiment of the present invention
Embodiment
Be noted that in explanation only the scan mode with the reflection original text is that example is done explanation in following embodiment before the embodiment, but those skilled in the art should recognize is that the present invention is also applicable to the scan mode of transmission original text.
Please refer to Fig. 2, it is the flow chart according to the method for correcting image of the error image avoided of a preferred embodiment of the present invention.The method at first can be judged and deceives correction, still carries out white correction (as step s202).When carrying out black correction, scanner can pass through fluorescent tube, light-illuminating is proofreaied and correct on the original text first, then proofreaied and correct light that original text reflected and can be incident upon on the speculum in the optical system, and obtain the first calibrating optical signal via the focussing force of the reflection of speculum and lens by first.Next, the first calibrating optical signal can be done opto-electronic conversion and convert the first straightening die analog signal to via capturing images element (for example being charge coupled cell).Afterwards, the first straightening die analog signal can convert first correcting digital signal to via analog/digital converter.Because when carrying out black correction, the response of capturing images element is very little, so be 0 via several positions, the front in first correcting digital signal that analog/digital converter converted to, therefore only getting rear bits gets final product (8 positions, for example desirable back).Can avoid like this making the image of scanning produce vertical bar line (LBB) phenomenon that should not have because dust or assorted point are arranged on the first correction original text.Be noted that in addition first proofreaies and correct to do and can be the black original text of proofreading and correct.(as step s204).And the rear bits in the first obtained correcting digital signal can be stored in the memory.Wherein memory can be random access memory.Because only get the rear bits in first correcting digital signal, so can reduce the demand of memory.(as step 206).
And when carrying out white timing, scanner can pass through fluorescent tube, light-illuminating is proofreaied and correct on the original text second, then proofreaied and correct light that original text reflected and can be incident upon on the speculum in the optical system, and obtain the second calibrating optical signal via the focussing force of the reflection of speculum and lens by second.Next, the second calibrating optical signal can be done opto-electronic conversion and convert the second straightening die analog signal to via capturing images element (for example being charge coupled cell).Afterwards, the second straightening die analog signal can convert second correcting digital signal to via analog/digital converter.Because when carrying out white timing, the response of capturing images element is very big, so must be 1 via the most significant digit (MSB) in second correcting digital signal that analog/digital converter converted to, therefore as long as get several positions, front (8 positions, for example desirable front), and most significant digit is filled out is 1 to get final product.Can avoid like this making the image of scanning produce the vertical bar line phenomenon that should not have because dust or assorted point are arranged on the second correction original text.Be noted that in addition second proofreaies and correct to do and can be white correction original text.(as step s208).And several the meetings in front in the second obtained correcting digital signal are stored in the memory.Wherein memory can be random access memory.Because only get the rear bits in second correcting digital signal, so can reduce the demand of memory.(as step 206).
In sum, the present invention system when carrying out black correction, only gets the rear bits in the digital signal that scans gained at black and white the two poles of the earth characteristic.And when carrying out white timing, only get the several positions, front in the digital signal of scanning gained, and the most significant digit in this digital signal is filled out is 1.Therefore, can avoid making the image of scanning produce the vertical bar line phenomenon that should not have because dust or assorted point are arranged on the correction original text.Moreover, because in the digital signal of scanning gained, only get less figure place, therefore also can reduce the demand of memory.
Claims (11)
1. the method for correcting image that can avoid error image is used for the one scan instrument, it is characterized in that, this method comprises the following steps:
When carrying out black correction, scanning one first can be proofreaied and correct one first correcting digital signal of original text gained, only get a plurality of positions of the back of this first correcting digital signal; And
When carrying out white timing, can scanning one second proofread and correct one second correcting digital signal of original text gained, only get this second correcting digital signal the front a plurality of positions and a most significant digit of this second correcting digital signal is filled out is 1.
2. the method for correcting image of avoiding error image as claimed in claim 1 is characterized in that, those positions of the back of this first correcting digital signal are stored in the memory.
3. the method for correcting image of avoiding error image as claimed in claim 2 is characterized in that, this memory is a random access memory.
4. the method for correcting image of avoiding error image as claimed in claim 1 is characterized in that, those positions of the front of this second correcting digital signal are stored in the memory.
5. the method for correcting image of avoiding error image as claimed in claim 4 is characterized in that, this memory is a random access memory.
6. the method for correcting image of avoiding error image as claimed in claim 1 is characterized in that, this first correction original text is a black original text of proofreading and correct.
7. the method for correcting image of avoiding error image as claimed in claim 1 is characterized in that, this second correction original text is a white original text of proofreading and correct.
8. the method for correcting image of avoiding error image as claimed in claim 1 is characterized in that the step when carrying out black correction more comprises the following steps:
After obtaining one first calibrating optical signal, can obtain one first straightening die analog signal at this first correction original text of scanning,, be converted to this first correcting digital signal again via an analog/digital converter via a capturing images element.
9. the method for correcting image of avoiding error image as claimed in claim 8 is characterized in that, this capturing images element is a charge coupled cell.
10. the method for correcting image of avoiding error image as claimed in claim 1 is characterized in that, when the step of carrying out white timing more comprises the following steps:
After obtaining one second calibrating optical signal, can obtain one second straightening die analog signal at this second correction original text of scanning,, be converted to this second correcting digital signal again via an analog/digital converter via a capturing images element.
11. the method for correcting image of avoiding error image as claimed in claim 10 is characterized in that, this capturing images element is a charge coupled cell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA021407983A CN1471300A (en) | 2002-07-25 | 2002-07-25 | Image correctino method capable of avoiding error image |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA021407983A CN1471300A (en) | 2002-07-25 | 2002-07-25 | Image correctino method capable of avoiding error image |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1471300A true CN1471300A (en) | 2004-01-28 |
Family
ID=34147662
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA021407983A Withdrawn CN1471300A (en) | 2002-07-25 | 2002-07-25 | Image correctino method capable of avoiding error image |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1471300A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103533211A (en) * | 2012-07-04 | 2014-01-22 | 佳能株式会社 | Document reading apparatus and image processing method |
-
2002
- 2002-07-25 CN CNA021407983A patent/CN1471300A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103533211A (en) * | 2012-07-04 | 2014-01-22 | 佳能株式会社 | Document reading apparatus and image processing method |
| US9237256B2 (en) | 2012-07-04 | 2016-01-12 | Canon Kabushiki Kaisha | Document reading apparatus and image processing method |
| CN103533211B (en) * | 2012-07-04 | 2016-02-10 | 佳能株式会社 | Document read device and image processing method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8130291B2 (en) | Defective pixel specifying method, defective pixel specifying system, image correcting method, and image correcting system | |
| EP0239936A2 (en) | A tresholding algorithm selection apparatus | |
| CN1438800A (en) | Image reading apparatus | |
| US7443546B2 (en) | Method for generating a calibration curve | |
| JPH06339026A (en) | Correction data generating device | |
| US7881557B2 (en) | Image correction method, apparatus, article and image | |
| CN1164073C (en) | Self-adapting timing control of light integration procedure in one-dimensional CMOS image sensor | |
| CN1471300A (en) | Image correctino method capable of avoiding error image | |
| US20060187502A1 (en) | Method and apparatus for increasing signal to noise ratio | |
| USRE40628E1 (en) | Apparatus for reducing exposing time of an image processing system | |
| CN1161960C (en) | Method for correcting multi-charge coupled element and its apparatus | |
| CN1245008C (en) | Compensating method of planar light source | |
| CN1167251C (en) | Multi-CCD corrector | |
| TW416216B (en) | Calibration method for image reading system | |
| CN1652140A (en) | Optical scanner | |
| CN1614987A (en) | Image fetcher and method for automatic correcting image size | |
| JP3105936B2 (en) | Image reading device | |
| CN1477848A (en) | Method for producing correction curve | |
| US20030042399A1 (en) | Calibration method of an image-capture apparatus | |
| TW569609B (en) | Full-zone optical image addressing apparatus | |
| JP3404819B2 (en) | Image scanner device | |
| CN1466369A (en) | Method for icreasing S/N ratio of signal | |
| JPH02272879A (en) | Picture reading device | |
| JPS61130995A (en) | Binary processing for density image | |
| JPH05227437A (en) | Picture reader |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C04 | Withdrawal of patent application after publication (patent law 2001) | ||
| WW01 | Invention patent application withdrawn after publication |