CN1263277C - Correcting method and device with multiple correcting curves - Google Patents
Correcting method and device with multiple correcting curves Download PDFInfo
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- CN1263277C CN1263277C CN 02160804 CN02160804A CN1263277C CN 1263277 C CN1263277 C CN 1263277C CN 02160804 CN02160804 CN 02160804 CN 02160804 A CN02160804 A CN 02160804A CN 1263277 C CN1263277 C CN 1263277C
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Abstract
The present invention relates to a correction method and apparatus for a scanner comprising a plurality of correcting curves, which is used for respectively correcting the shading distortion of the scanner under different scanning conditions. The correction method and apparatus with the correcting curves can respectively obtain individual shading distortion correcting curve according to different scanning conditions after the scanner is started, and the shading distortion correcting curve is stored in a buffer storage. When a user uses the scanner to scan, proper correcting curves are immediately obtained for scanning according to the actual scanning set. The correction method and apparatus for the correcting curves stores a set of correcting curves in advance after the machine is started. Under the same scanning condition, the correction is not needed before the scanning for each time, and the scanning action can be immediately carried out. Therefore, the scanning time of the user can be greatly saved.
Description
Technical field
The present invention relates to a kind of scanner calibration method and apparatus that comprises many calibration curves, by many calibration curves of prior storage, the user can set according to scanning and take out suitable calibration curve use immediately, to save user's sweep time.
Background technology
General image scanner places original contribution on the scanning platform in order to scanning, by scanner light source projects light on original contribution, again by an image capture unit, for example charge coupled device (charge-coupled device) captures the source light that reflects from original contribution and converts numeral to or the signal of video signal of simulation.In aforesaid image scan process, tend to the variation, the light source supply intensity variation that change in voltage caused that produce in time because of transfer characteristic, and light causes look distortion (shading distortion) phenomenon that declines through the factors such as intensity variation that cause behind the lens from the photoelectric conversion device (for example aforesaid charge coupled device) of the intensity variation of light source, definition pixel.
This kind look distortion phenomenon that declines is meant that an image with same background brightness carries out optical scanner and during via the photoelectric conversion device pick-up image, the electronic signal intensity that photoelectric conversion device is exported not is unanimity through image fetch device.
The error of the electronic signal of photoelectric conversion device output developed at present and the decline bearing calibration of distortion of various looks, so that can be reduced to minimum.By these bearing calibrations, make image scanner when acquisition one has the image of same background brightness, the electronic signal of exportable intensity unanimity.
The bearing calibration that declines of existing look is to carry out before the image of each acquisition one original contribution, at first use a white correcting plate, and through photoelectric conversion device from the look of this white correcting plate acquisition reference white correction data that declines, then block the photoelectric conversion device line scanning of going forward side by side, the look that the reference that acquisition is produced the is black correction data that declines.Use the reference captured look black and reference white the correction data that declines, can draw the chromatic attenuation correction curve of this image scanner, as shown in Figure 1, carry out the look correction that declines with the master copy image to acquisition after a while, wherein calibration curve 102,104 is respectively a pairing chromatic attenuation correction curve under the different scanning resolution.
Generally speaking, aforementioned white correcting plate is arranged at the outer ad-hoc location of scanning platform, and this white correcting plate is positioned on the light path approach of the optical system that scan manuscript uses.Before original copy was scanned, this white correcting plate captured its image data through scanning and by photoelectric conversion device, with the chromatic attenuation correction curve that obtains to be correlated with, according to this chromatic attenuation correction curve, the i.e. image data of the original copy that recoverable read.
Chromatic attenuation correction curve transverse axis shown in Figure 1 is a location of pixels, the longitudinal axis is an image capture unit, charge coupled device for example, institute's picked image electronic signal, because chromatic attenuation correction curve has promptly reflected at different location of pixels, the variation of image capture unit institute picked image electronic signal.Under ideal state, the image of same background brightness should be a horizontal line through image capture unit institute picked image electronic signal, that is not because of location of pixels changes, so chromatic attenuation correction curve can be used to revise the look that produces in the scan-image distortion that declines.
In addition, chromatic attenuation correction curve can be set and difference according to different scanning circumstances, change-color range size as the scanner scanning setting, the number of scanning lines number, the sweep speed speed, the scanning direction is unidirectional or two-way, different scanning resolutions is set, the kind of light source (getting final product the transformation light source kind) for transparent or nontransparent original contribution, the scan mode of single or double, the selection of scanning contribution block size, original contribution is scanned into black and white or colored data, color contrast intensity in the original contribution, single sweep operation or full-color scanning, and the replacing of scanning platform etc.. the change that the scan mode of all scanners own is set promptly can have influence on the variation of calibration curve.Other is as the change of original contribution pattern, as original contribution kind (if the positive of the original contribution egative film that is scanned or negative film, transparency, lantern slide or photograph ... etc. contribution of different nature), original contribution size (B5, A3 or business card etc..) wait several different contribution class formulas, also can cause the difference of calibration curve.And set via the artificial scanner peripheral environment that is influenced to highlight original contribution effect etc. as the peripheral brightness difference of scanning machine, the conversion of scan-image light source primary colors (making into based on redness or blueness or green), also can correspond to different chromatic attenuation correction curves.
Traditional image scanner can only store a calibration curve in buffer, therefore all can carry out one time correction work earlier before each image scanner begins to scan original contribution under the default situation, to avoid the scanning circumstance setting changing but calibration curve and then adjust and scan-image correctly proofreaied and correct.Then deposit the chromatic attenuation correction curve that is drawn in buffer, treat in buffer, to take out again when original contribution is scanned chromatic attenuation correction curve to revise image data.
Shown in Figure 2 is the flow chart that traditional image scanner scans, wherein step 210 is the electric power startings with image scanner, step 220 is awaiting orders after the start (pre-temperature) processes, purpose is to wait for that the light source of image scanner arrives the temperature or the state of operate as normal, to guarantee the stability of light source works.Step 230 is the flow processs whether judgement has contribution to scan, if do not have, then get back to (pre-temperature) flow process of awaiting orders of step 220, if have, then enter the trimming process of step 240, set, for example scanning resolution, and the kind of original contribution etc. according at that time scanning circumstance, in the hope of a suitable calibration curve, deposit in it in buffer and enter step 250; The original contribution of scanner meeting actual scanning in step 250 takes out calibration curve and revises original image data signal in buffer, the image data signal after will proofreading and correct again exports computer or other any storage facilities to.
Obvious, all must spend the extra time to carry out asking for of calibration curve in the image scan process each time, particularly do not set and change when user's scanning circumstance, for example under the constant situation of scanning resolution during the similar original contribution of continuous sweep, the stand-by period that this class user additionally expends is accumulated considerable especially.Therefore, need a kind of image scanning method that do not reduce correction program sweep time again or device can saved to satisfy user's demand.
Summary of the invention
Described in the foregoing invention background, a main purpose of the present invention is that multiple scanning calibration curve is provided simultaneously, for the distortion (shading distortion) that declines of the look of correction scanner under the different scanning environment set.
Advantage of the present invention is to provide and store the multi-strip scanning calibration curve simultaneously after the scanner start, takes out use at any time for the user, and saves user's sweep time.
Another main purpose of the present invention is that conventional scanner all only stores a calibration curve, therefore must do earlier before each scanning and proofread and correct scan manuscript again; And the bearing calibration of many calibration curves of the present invention and the device one group of calibration curve that after start, prestores earlier, each afterwards scanning not again the hand-manipulating of needle proofread and correct setting with a kind of scanning circumstance, can directly take calibration curve.
A main purpose more of the present invention is to provide and store the multi-strip scanning calibration curve simultaneously after the scanner start, corresponding different respectively scanning circumstances are set, to save user's sweep time, guarantee that simultaneously scanner can capture real scan-image through overcorrect.
For reaching above-mentioned purpose, the invention provides a kind of scanning means that uses many calibration curves, be applicable to the one scan instrument, this scanning means comprises: a light source; One photoelectric conversion device is in order to convert the light signal that this light source sent to corresponding electronic signal; This photoelectric conversion device scanning is set and controlled to one calibration setup control unit, storage arrays scanning circumstance, to obtain the correction data that corresponding described scanning circumstance is set; One correction data acquisition unit captures and calculates the correction data that these scanning circumstances are set, to obtain several corresponding calibration curves; One calibration curve buffer stores described calibration curve; And an image capture control unit, control this photoelectric conversion device scan-image data and take out corresponding described calibration curve to revise this image data from this calibration curve buffer.
For reaching above-mentioned purpose, the present invention also provides a kind of scan method of using many calibration curves, is applicable to the one scan instrument, it is characterized in that, the scan method of these many calibration curves comprises: obtain several calibration curves, corresponding different respectively scanning circumstances are set; These several calibration curves are deposited in the buffer; Scanning circumstance according to user's appointment is set the calibration curve of taking correspondence in this buffer; And scan original contribution and with the signal of video signal of the original contribution of this calibration curve correction of taking.
Owing to the invention provides a kind of scanner calibration method and apparatus that comprises many calibration curves, in order to the look of the correction scanner distortion that declines respectively under setting at different scanning circumstances.Bearing calibration of these many calibration curves and device are to set at various scanning circumstance in scanner start back to obtain other chromatic attenuation correction curve respectively, and deposit in the buffer, when the user uses scanner to scan after a while, just can take out suitable calibration curve immediately and scan according to the actual scanning condition.
Description of drawings
Fig. 1 is common calibration curve schematic diagram;
Shown in Figure 2 is the flow chart that traditional image scanner scans;
Shown in Figure 3 is the bearing calibration of many calibration curves of the present invention and the concrete Organization Chart of device;
Shown in Figure 4 is the circuit block diagram that bearing calibration of the present invention and device captured and used many calibration curves;
Shown in Figure 5 is the bearing calibration of many calibration curves of the present invention and the scanning imaging system flow chart of device.
Symbol description among the figure
Chromatic attenuation correction curve under 102 first resolution
Chromatic attenuation correction curve under 104 second resolution
210 open the image scanner power supply
220 image scanner standbies are temperature in advance
230 judge whether have contribution to need scanning
240 rescan according to the scanning contribution, and obtain calibration curve
The original contribution of 250 scanner scanning
302 black/white look correcting plates
304 light sources
306,308,310 eyeglasses
312 lens
316 optical sensors
318 scan manuscripts
410 calibration setup control units
420 photoelectric conversion devices
430 correction data acquisition units
440 calibration curve buffers
450 image capture control units
460 image storage devices
510 open the scanner power supply
520 scanner preheating standbies
530 scanners are set calibration curve and are deposited buffer in
540 scanners etc. are to be scanned
Whether 545 calibration curves are stored in the buffer
550 scanners are obtained calibration curve according to environment set in buffer
555 according to the vertical new scanning of scanning contribution, and obtain calibration curve
The original contribution of 560 scanner scanning
Embodiment
The bearing calibration of many calibration curves proposed by the invention and the preferred embodiment of device will be described in detail as follows, yet except describing in detail, the present invention can also be widely implements at other embodiment, and scope of the present invention is not limited, and its scope with claims is as the criterion.
Shown in Figure 3 is the bearing calibration of many calibration curves of the present invention and the concrete Organization Chart of device, this concrete framework is made of the part assembly of an image scanner, and the concrete framework of this icon is only in order to illustrate preferred embodiment of the present invention, not in order to limit scope of the present invention and implementation detail.Comprise lens set that a black/white look correcting plate 302, a light source 304, comprise eyeglass 306,308,310 and lens 312, an optical sensor 316, and one scan original copy 318 among the figure.
Black/white look correcting plate 302 is in order to scanning, declines the correction data to be used for the look correction that declines to obtain simultaneously with reference to black look with reference white, and this black/white look correcting plate 302 can place a side of transparent scanning platform (not at icon).
Light source 304 can be a fluorescent lamp or a Halogen lamp LED, in order to throw light to black/white look correcting plate 302 and scan manuscript 318.Light source 304 can move along direction of arrow A, so that light source 304 can be with ray cast on the whole original text face of scan manuscript 318.
The lens set that comprises eyeglass 306,308,310 and lens 312 in order to the ray guidance of scan manuscript 318 reflections to optical sensor 316, optical image is converted to the electron image signal.
The present invention removes and can directly scan, obtain simultaneously outside the calibration curve with reference to black and reference white to use black/white look correcting plate 302, can also be for asking more accurate with reference to black calibration curve, and use an other method to obtain, in case record the issuable error situation of part on the black/white look correcting plate 302 with reference to the black correction curve with reference to black calibration curve.Another kind of is that light source 304 is closed with reference to the black look correction data acquisition mode that declines, and by optical sensor 316 pick-up image data, since optical sensor 316 not throw light on black/white look correcting plate 302, so do not have light from black/white look correcting plate 302 reflection, so optical sensor 316 picked image data can be used as with reference to the black look correction data that declines.
Decline after the correction data when obtaining look with reference to black and reference white, just can obtain the calibration curve that declines of the same colour, and this chromatic attenuation correction curve is deposited in the buffer.Yet this chromatic attenuation correction curve changes along with the change of scanning resolution, light source (whether the scan manuscript material is transparent) or different original contribution (positive or negative film), therefore need set corresponding chromatic attenuation correction curve at various scanning circumstances.
Shown in Figure 4 is the circuit block diagram that bearing calibration of the present invention and device captured and used many calibration curves, comprise calibration setup control unit 410, photoelectric conversion device 420, proofread and correct DAQ unit 430, calibration curve buffer 440, image capture control unit 450 and image storage device 460, wherein photoelectric conversion device 420 comprises the optical sensor 316 among Fig. 3, and correction data acquisition unit 430 is controlled black/white look correcting plates 302, reached light source 304.
Have several different scanning circumstances in the calibration setup control unit 410 and set, these scanning circumstances are set and can be deposited in when scanner dispatches from the factory or be changed voluntarily by the user, or the setting of being used always by calibration setup control unit 410 storage users deposits in voluntarily.After the scanner start is stable, calibration setup control unit 410 may command photoelectric conversion devices 420 are set at individual other scanning circumstance and are scanned, and by the scanning data of correction data acquisition unit 430 acquisition photoelectric conversion devices 420 gained and calculate corresponding calibration curve, and then the calibration curve that calculates is deposited in the calibration curve buffer 440.
According to stored different scanning environment set in the calibration setup control unit 410, repeat abovementioned steps in regular turn, set pairing calibration curve up to all scanning circumstances and all deposit in the calibration curve buffer 440, the user just can bring into use scanner to scan.Image capture control unit 450 is set according to the scanning circumstance of user's appointment, control photoelectric conversion device 420 scan manuscripts, and to calibration curve buffer 440, take out corresponding calibration curve to revise the image data of photoelectric conversion device 420 scanning gained.This promptly exports as the image of scanner through revised image data, and is sent to 460 storages of image storage device.
If the scanning circumstance of user's appointment is set not in the setting range that calibration setup control unit 410 stores in advance, then image capture control unit 450 earlier control photoelectric conversion devices 420 carry out corresponding calibration curve earlier with correction data acquisition unit 430 and ask for, again calibration curve is deposited in the calibration curve buffer 440.Image capture control unit 450 is controlled photoelectric conversion device 420 again with scan manuscript subsequently, and the calibration curve that taking-up had before deposited in the self-correcting curve buffer 440, carrying out the image correction of scan manuscript, and then revised image data is deposited in the image storage device 460.
So the bearing calibration and the device of many calibration curves of the present invention, can set a scanning of for example changing scanner itself at several default scanning circumstances after start sets (as several scanning resolutions commonly used, light source kind etc..), (as scanning is egative film, projection part etc. for the change set at original contribution ...) and artificial scanner peripheral environment operating influence situations such as (changing) as peripheral brightness difference, light source primary colors carry out the calibration curve that various scanning circumstances set in advance and set, and deposit in the buffer simultaneously.When scanning after a while, scanner directly captures scan-image, sets from buffer according to scanning at that time and takes out corresponding calibration curve to carry out the data correction of scan-image.Must be as conventional scanner, even under identical scanning circumstance is set, as long as begin to scan contribution, contribution each time all needs to carry out the scanning detecting earlier and proofread and correct, and just can begin to scan another part contribution to obtain same calibration curve.Even different scanning circumstances such as change that the scanning that the user changes scanner itself in the present invention is set, set at original contribution and artificial scanner peripheral operation influence are set, scanner only needs to set according to the scanning circumstance after changing, take corresponding calibration curve use in the buffer, must not carry out earlier to proofread and correct and just scan contribution.Or the not selected scanning circumstance setting that presets of desire of user, also can make scanner detecting again voluntarily, then obtain calibration curve corresponding to scanning circumstance setting at that time, be that this calibration curve of sustainable use scans original contribution, the calibration curve of need not at every turn all will resurveying one time, and can save time; Afterwards, also the calibration curve that this newly can be measured deposits in the buffer, takes out when scanning contribution for next time and uses.
Shown in Figure 5 is the bearing calibration of many calibration curves of the present invention and the scanning imaging system flow chart of device.Step 510 is scanner starts, step 520 waits for that the scanner light source arrives stable normal working temperature and state, after the scanner light source arrives stable normal working temperature and state, enter step 530, scanner is set according to several scanning circumstances of setting in advance and is tried to achieve corresponding calibration curve respectively in this step, and deposits in the buffer respectively.Finish the setting of calibration curve when scanner after, just enter step 540, scanner is waited for the scan instruction from the user in step 540.When the user assigns scan instruction, scanner just enters step 545, judges whether the required calibration curve of scanning circumstance that the user assigns is present in the buffer.If required calibration curve has been present in the buffer, just enter step 550, set according to user's scanning circumstance at that time, to buffer, take out corresponding calibration curve, and enter step 560.If scanner judges that in step 545 required calibration curve is not present in the buffer, then enter step 555, setting according to the scanning contribution, rescan contribution, and obtain calibration curve, and then entering step 560, scanner begins to scan original contribution, and, more revised scan-image data is exported to computer or other any storage device according to the raw video data that corresponding calibration curve correction scans.
Therefore, the bearing calibration of many calibration curves of the present invention is by the calibration curve of asking in advance after the scanner start under every different scanning environment with device, and deposit in the buffer, make and choose correspondence when the user uses scanner after a while automatically, suitable calibration curve carries out the image correction, must not wait for the aligning step that each scanning is preceding again, and save user's sweep time.
The above only is explanation preferred embodiment of the present invention, is not that all other do not break away from change or the correction of being done under the disclosed spirit of the present invention, all should be included in the scope of claims in order to qualification protection scope of the present invention.
Claims (10)
1. a scanning means that uses many calibration curves is applicable to the one scan instrument, it is characterized in that this scanning means comprises:
One light source;
One photoelectric conversion device is in order to convert the light signal that this light source sent to corresponding electronic signal;
This photoelectric conversion device scanning is set and controlled to one calibration setup control unit, storage arrays scanning circumstance, to obtain the correction data that corresponding described scanning circumstance is set;
One correction data acquisition unit captures and calculates the correction data that these scanning circumstances are set, to obtain several corresponding calibration curves;
One calibration curve buffer stores described calibration curve; And
One image capture control unit is controlled this photoelectric conversion device scan-image data and is taken out corresponding described calibration curve to revise this image data from this calibration curve buffer.
2. the scanning means of many calibration curves of use as claimed in claim 1 is characterized in that, above-mentioned calibration curve is in order to the correcting colour distortion that declines.
3. the scanning means of many calibration curves of use as claimed in claim 1 is characterized in that, it is to set when this scanning means dispatches from the factory that the described scanning circumstance that above-mentioned calibration setup control unit stores is set.
4. the scanning means of many calibration curves of use as claimed in claim 1 is characterized in that, above-mentioned calibration curve is to obtain after this scanning means start, and deposits in this calibration curve buffer.
5. the scanning means of many calibration curves of use as claimed in claim 3, it is characterized in that, above-mentioned calibration curve corresponds respectively to described different scanning circumstance and sets, and described different scanning is set and is made up of with different scanner peripheral environments the different scanning form of this scanner, different document forms.
6. the scanning means of many calibration curves of use as claimed in claim 1 is characterized in that, the described scanning circumstance that above-mentioned calibration setup control unit stores is set, and can be deposited in voluntarily according to the setting that the user uses always by this calibration setup control unit.
7. the scanning means of many calibration curves of use as claimed in claim 1, it is characterized in that, above-mentioned image capture control unit more comprises this photoelectric conversion device of may command and is directed to the scanning circumstance that does not deposit this calibration curve buffer in and sets and to scan, in the hope of the new calibration curve of this correspondence, and deposit the function of this calibration curve buffer in.
8. the scanning means of many calibration curves of use as claimed in claim 1, it is characterized in that, the described scanning circumstance that above-mentioned calibration setup control unit stores is set, can choose voluntarily by the user and use or modification, and deposit modified scanning circumstance setting in this calibration setup control unit.
9. a scan method of using many calibration curves is applicable to the one scan instrument, it is characterized in that this scan method comprises:
Obtain several calibration curves, corresponding different respectively scanning circumstances are set;
These several calibration curves are deposited in the buffer;
Scanning circumstance according to user's appointment is set the calibration curve of taking correspondence in this buffer; And
Scan original contribution and with the signal of video signal of the original contribution of this calibration curve correction of taking.
10. the scan method of many calibration curves of use as claimed in claim 9, it is characterized in that, more comprise with an image capture control unit and control this photoelectric conversion device scanning, and set corresponding to a new and scanning circumstance that do not deposit in this calibration curve buffer, try to achieve a new calibration curve, and deposit in this buffer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02160804 CN1263277C (en) | 2002-12-30 | 2002-12-30 | Correcting method and device with multiple correcting curves |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02160804 CN1263277C (en) | 2002-12-30 | 2002-12-30 | Correcting method and device with multiple correcting curves |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1512752A CN1512752A (en) | 2004-07-14 |
| CN1263277C true CN1263277C (en) | 2006-07-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02160804 Expired - Fee Related CN1263277C (en) | 2002-12-30 | 2002-12-30 | Correcting method and device with multiple correcting curves |
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| CN (1) | CN1263277C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102497487A (en) * | 2011-12-07 | 2012-06-13 | 威海华菱光电有限公司 | Infrared light image data processing device |
| CN102938822A (en) * | 2012-11-15 | 2013-02-20 | 艾塔斯科技（镇江）有限公司 | Scanning copying device and scanning calibration method |
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