CN1089923C - Dynamic image scanning method - Google Patents
Dynamic image scanning method Download PDFInfo
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- CN1089923C CN1089923C CN 97115409 CN97115409A CN1089923C CN 1089923 C CN1089923 C CN 1089923C CN 97115409 CN97115409 CN 97115409 CN 97115409 A CN97115409 A CN 97115409A CN 1089923 C CN1089923 C CN 1089923C
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Abstract
The present invention relates to a dynamic image scanning method which is used for improving the quality of images. Firstly, a group of parameters are used for scanning for the first time for generating a first image; after the composition distribution of the first image is analyzed, if the composition distribution of the first image does not reach a presetting value in a presetting range, at least one parameter in the group of parameters is adjusted; the adjusted parameter group is used for scanning for the second time for generating a second image; finally, the first image and the second image are added to form a composite image. The composition distribution of the composite image can at least reach the presetting value in the presetting range.
Description
The present invention relates to a kind of method of scan image, relate in particular to a kind of method of dynamic image scanning.
Image processing system mainly is via assembling a scanning light beam and use optical detection device, and charge-coupled device (CCD) for example is in order to produce the image electronic signal.This image electronic signal is usually again through further handling, store and showing, to be applied to various situations.Image analyzer, video camera and facsimile recorder are exactly some image processing systems that modernized company and family usually use.
Shown in Figure 1 is the functional block diagram of traditional images disposal system.Wherein, label 10 expression files after the image of file 10 is illuminated by fluorescent tube 12, via the reflection of mirror 14, are focused on by at least one lens 16 again.The image of this focusing is handled via a pretreating device 20 (for example DC current gain amplifier) after being obtained by charge-coupled device (CCD) 18 detections, and this DC current gain amplifier is normally formed by general operational amplifier.Then, analog-digital converter (ADC) 22 is converted to digital signal with processing signals before this analog form, and wherein black is with reference to input R
BAnd white reference input R
WBe in order to adjust the use working range of analog-digital converter (ADC) 22.Digitized signal is again through after-treatment device 24, for example add agate (Gamma) treatment for correcting after, be stored in the impact damper in the storer 26, with as further handling or demonstration.
Density range is one of important parameter of image processing system (for example image analyzer).This density range is to be relevant to intrasystem signal/noise ratio.For example, have value and be the scan image of 2 density range, have only when system information/noise than greater than 100 (that is 10
2) time, can differentiate and draw this scan image.In general, the signal/noise when system compares greater than 10
DThe time, we claim that its density range is D.Above-mentioned signal/noise is than being determined by signal/noise ratio of charge-coupled device (CCD) and/or signal/noise ratio of system's other parts.As for digital image processing system, then its signal/noise is relevant to the bit number of system than system.For example, when system had 256 gray scales, its signal/noise ratio became 256.And its density range D becomes 2.4 (that is 1og256).
The non-linear effects that traditional images disposal system as shown in Figure 1, this system are subjected to some elements (for example operational amplifier in the pretreating device 20 and charge-coupled device 18) is bigger.Fig. 2 A shows the family curve of conventional charge coupling mechanism, and wherein the light intensity of charge-coupled device is imported in the X-axis representative, and Y-axis is then represented the output voltage of charge-coupled device.Desirable charge-coupled device family curve of dotted line 30 expressions, solid line 32 is then represented general charge-coupled device family curve.The 32a of solid line 32 partly represents the image of dark portion, and 32c represents the image of highlights, has only label 32b partly to have linear characteristic.
The family curve of Fig. 2 B display system density range, wherein input density scope and output density scope are represented with X-axis and Y-axis respectively.The 34a of family curve 34 partly represents the image of dark portion, and 34c represents the image of highlights, has only label 34b partly to have linear characteristic.
Traditional images disposal system as shown in Figure 1, wherein most scanning operating parameters is fixed, and perhaps is not easy at least adjust.These parameters include the time shutter, the black of the yield value of the reflectance of exposure intensity, charge-coupled device 18, DC current gain amplifier 20, analog-digital converter (ADC) 22 with reference to input and white reference input, add agate (Gamma) Correction Processor 24 add the agate value, or the enhancing of after-treatment device 24/weaken function.
Fig. 3 shows the spectrogram of two worst-case, and wherein X-axis is represented gray-scale value, and the Y-axis representative is to the total number of specific gray value.Curve 36 is represented a dark image, and curve 38 is represented a bright image.Because traditional image processing system uses identical parameter handling this two kinds of images, thereby has caused very poor image scanning treatment effect.
The objective of the invention is to propose a kind of method of dynamic image scanning, in order to improve the quality of image.
The object of the present invention is achieved like this:
A kind of method of dynamic image scanning is characterized in that this method comprises at least:
Use one group of parameter, make scan image for the first time, to form one first image;
The composition of analyzing this first image distributes, and wherein above-mentioned composition distributes and comprises most numerical value at least, in order to each gray scale of difference representative image;
When the composition of this first image is distributed in when not reaching a predetermined amount in the preset range, then adjust at least one parameter in this group parameter;
Use this adjusted group parameter of being somebody's turn to do, make scan image for the second time, to form one second image; And
With this first image and this second image addition,, make the composition of this composograph be distributed in this preset range and can reach this predetermined amount at least to form a composograph.
A kind of method of dynamic image scanning is characterized in that this method comprises at least:
Form an image scanning system and be used for scan image, this image scanning system is to comprising: a light source, in order to illuminate the image of one scan; One photo-detector, it is coupled to this light source, in order to survey the image that this illuminates; One gain amplifier, it is connected to this photo-detector, and in order to adjust the DC current gain of this image, this gain amplifier has an input end, in order to adjust this DC current gain; One analog-digital converter, it is connected with gain amplifier, and to digital form, this analog-digital converter has two input ends to receive black reference signal and white reference signal in order to the analog form of converted image; One after-treatment device, it is connected with analog-digital converter, in order to handle the image after this conversion;
Use one first group of parameter, make scan image for the first time, to form one first image;
Use one second group of parameter, make scan image for the second time, to form one second image, this first group of parameter parameter at least wherein is different with the parameter of corresponding this second group of parameter; And
With this first image and second image addition, to form a composograph.
A kind of method of dynamic image scanning is characterized in that this method comprises at least:
Form an image scanning system in order to scan image, this image scanning system comprises at least: a light source, in order to illuminate the image of one scan; One photo-detector, it is coupled to this light source, in order to survey the image that this illuminates; One gain amplifier, it is connected to photo-detector, and in order to adjust the DC current gain of this image, this gain amplifier has an input end, in order to adjust this DC current gain; One analog-digital converter, it is connected with gain amplifier, and to the numerical digit form, this analog-digital converter has two input ends to receive black reference signal and white reference signal in order to the analog form of converted image; One after-treatment device, it is connected with analog-digital converter, in order to handle the image after this conversion;
Used for one first time shutter, make scan image for the first time, to form one first image;
Used for one second time shutter, make scan image for the second time, to form one second image, this first time shutter is short than this second time shutter; And
With this first image and this second image addition, to form a composograph.
The present invention is owing to be provided with " adjustment parameter " step 44a and 44b and " scanning of the dark portion of highlights " step 46a and 46b and other levelling parameter in the image scanning flow process, the system that makes can be dynamically and automatically is adjusted to a best effort scope, thereby has improved the quality of image; Simultaneously, the image addition that system has scanned after having adopted the image after will scanning the first time and having adjusted parameter for the second time to form a composograph, has made it to improve the response characteristic and the quality of image.
Concrete grammar of the present invention is provided by following embodiment and accompanying drawing thereof.
Fig. 1 represents the functional block diagram of traditional images disposal system.
Fig. 2 A represents the family curve of conventional charge coupling mechanism.
Fig. 2 B represents system density ranges of characteristics curve.
The example of Fig. 3 presentation video spectrogram.
Fig. 4 is the image scanning process flow diagram according to an embodiment of the method for the dynamic image scanning of the present invention's proposition.
Fig. 5 is the image scanning block diagram according to an embodiment of the method for the dynamic image scanning of the present invention's proposition.
Fig. 6 represents the spectrogram of normal grey value profile.
Fig. 7 is according to the characteristic example of system density scope among another embodiment of the method for the dynamic image scanning of the present invention's proposition.
Propose concrete grammar and working condition below in conjunction with the accompanying drawing detailed description according to the present invention, therefrom also can further find out other purpose of the present invention, feature and advantage.
Please referring to Fig. 4 and Fig. 5, Fig. 4 is the wherein image scanning process flow diagram of an embodiment of the present invention, and Fig. 5 represents the block diagram with respect to Fig. 4.See Fig. 4, in step 40, do scanning for the first time, and will scan as using and the identical sweep parameter of tradition scanning.See Fig. 5, use exposure-control device 50 to input to the light reflectance of charge-coupled device (CCD) 52 with control.The output of charge-coupled device 52 is handled through a pretreating device 54 (for example DC current gain amplifier), and this DC current gain amplifier is normally formed by general operational amplifier.The output of pretreating device 54 needs an analog-digital converter (ADC) 56 that processing signals before this simulation is converted to digital signal by being simulating signal thus usually.Mould-converter (ADC) 56 has two input reference signals usually, and (that is black is with reference to input R
BAnd white reference input R
W), in order to adjust the usable range of analog-digital converter (ADC) 56.Digitized signal is handled through after-treatment device 58 again, for example adds the correction of agate (Gamma).The said system parameter includes the time shutter, the black of the yield value of the reflectivity degree of exposure intensity, charge-coupled device 52, DC current gain amplifier 54, analog-digital converter (ADC) 56 adds the agate value with reference to input and white reference input, after-treatment device 58, or the enhancing of after-treatment device 58/weaken function correlation.
The above-mentioned sweep signal that is produced in step 40 inputs to pre-viewing device 62 in step 42, in order to the analysis scan signal, to determine the distribution scenario of its gray-scale value.In the present embodiment, pre-viewing device 62 is to implement with the form (or drive form) that is stored in system's register.Fig. 6 shows the spectrogram of normal grey value profile, and wherein X-axis is represented gray-scale value, and the Y-axis representative is to the total number of specific gray value.As shown in the figure, most grey value profile is at the middle position of frequency spectrum, thereby has linear characteristic.When the analysis result of pre-viewing device 62 shows all just often, then the output signal with after-treatment device 58 stores, or is further handled.The normal condition of above-mentioned analysis is a number of representing to exist at least a predetermined value above, is positioned at a predetermined tonal range (Fig. 6 g for example
1And g
2Between) in.In the present embodiment, g
1And g
2Be respectively 20% and 80% of system's maximum gradation value.
When the analysis result of pre-viewing device 62 shows up-set condition (for example Fig. 3 situation), then in step 44a or 44b, adjust at least one parameter, the system that makes can be dynamically and automatically is adjusted to a best effort scope, and follow in step 46a or 46b, do highlights or the scanning of dark portion.For example, if for the first time the image of scanning finds that it is too dark in the back by analysis, then pre-viewing device 62 can control exposure control units 50, increase the time shutter, with Adjustment System to a new working range dynamically, thereby can handle this dark signal best.Except the adjustment time shutter, also can reach identical purpose by adjusting other parameter, for example increase the brightness of fluorescent tube.Further strengthen the quality of image if desired, then can reach by the adjustment of some parameters again, but need to use the more processing time.
Except having used different parameters, the scanning processing method of secondary highlights or dark portion's scanning (step 46a or 46b) and scanning for the first time is the same.Then, in step 48,,, make this composite signal have than traditional images signal and reflection characteristic preferably to form a composite signal with the first time scan process and the signal that stores and the signal plus of highlights or dark portion scan process for the second time.In the present embodiment, totalizer 64 is to implement with the form (or drive form) that is stored in system's register.Though pre-viewing device 62 and totalizer 64 are implemented with software mode in the present embodiment, yet, for the person skilled in the art, this two partly can convert to easily all or partly hardware mode reach.
According to another embodiment of the present invention, the image processing system of the 5th figure mainly is to be used for overcoming above-mentioned nonlinear problem.Referring to Fig. 7, present embodiment uses two groups of reference signals, that is (R
W1, R
B1) and (R
W2, R
B2), be respectively applied for the scanning of highlights and dark portion.Reference signal (R
W1, R
B1) input to analog-digital converter (ADC) 56 at step 44a, and do highlights scanning at step 46a.Then, reference signal (R
W2, R
B2) input to analog-digital converter (ADC) 56 at step 44b, and do the scanning of dark portion at step 46b.At last, in step 48, with totalizer 64 with this two sweep signals addition, thereby obtain one the improvement family curve 70 (originally relatively poor curve is shown in the label 72).In this embodiment, pre-viewing device 62 does not need to analyze the picture signal of scanning for the first time, and does not therefore use in the present embodiment in 48 path from square 40 to square.
The above is preferred embodiment of the present invention only, is not in order to limit claim of the present invention; All other do not break away from the equivalence of being finished under the disclosed spirit and changes or modification, all should comprise within the scope of the claims.
Claims (13)
1. the method for a dynamic image scanning is characterized in that, this method comprises at least:
Use one group of parameter, make scan image for the first time, to form one first image;
The composition of analyzing this first image distributes, and wherein above-mentioned composition distributes and comprises most numerical value at least, in order to each gray scale of difference representative image;
When the composition of this first image is distributed in when not reaching a predetermined amount in the preset range, then adjust at least one parameter in this group parameter;
Use this adjusted group parameter of being somebody's turn to do, make scan image for the second time, to form one second image: and
With this first image and this second image addition,, make the composition of this composograph be distributed in this preset range and can reach this predetermined amount at least to form a composograph.
2. the method for dynamic image scanning as claimed in claim 1, it is characterized in that: described image scanning is to finish with an image scanning system, and this image scanning system comprises at least:
One light source is in order to illuminate the image of one scan;
One photo-detector, it is coupled to this light source, in order to survey the image that this illuminates;
One gain amplifier, it is connected to this photo-detector, and in order to adjust the DC current gain of this image, this gain amplifier has an input end, in order to adjust this DC current gain;
One analog-digital converter, it is connected with gain amplifier, and to digital form, this analog-digital converter has two input ends to receive black reference signal and white reference signal in order to the analog form of converted image; And
One after-treatment device, it is connected with analog-digital converter, in order to handle the image after this conversion.
3. the method for dynamic image scanning as claimed in claim 1, it is characterized in that: described after-treatment device comprises one at least and adds the agate correcting circuit, adds the agate value in order to what adjust this image.
4. the method for dynamic image scanning as claimed in claim 4, it is characterized in that: described after-treatment device comprises one at least and strengthens/weaken circuit, in order to adjusting the gray scale of this image, this enhancing/weaken circuit has an input end to receive an enhancing/attenuated signal.
5. the method for dynamic image scanning as claimed in claim 1, it is characterized in that: described parameter group comprise at least time shutter, this light source of this light source exposure intensity, a DC current gain value, a black reference signal value, a white reference signal value, this adds the agate value, and this enhancing/attenuated signal.
6. the method for a dynamic image scanning is characterized in that, this method comprises at least:
Form an image scanning system and be used for scan image, this image scanning system is to comprising: a light source, in order to illuminate the image of one scan; One photo-detector, it is coupled to this light source, in order to survey the image that this illuminates; One gain amplifier, it is connected to this photo-detector, and in order to adjust the DC current gain of this image, this gain amplifier has an input end, in order to adjust this DC current gain; One analog-digital converter, it is connected with gain amplifier, and to digital form, this analog-digital converter has two input ends to receive black reference signal and white reference signal in order to the analog form of converted image; One after-treatment device, it is connected with analog-digital converter, in order to handle the image after this conversion;
Use one first group of parameter, make scan image for the first time, to form one first image;
Use one second group of parameter, make scan image for the second time, to form one second image, this first group of parameter parameter at least wherein is different with the parameter of corresponding this second group of parameter; And
With this first image and second image addition, to form a composograph.
7. the method for dynamic image scanning as claimed in claim 6, it is characterized in that: described after-treatment device comprises one at least and adds the agate correcting circuit, adds the agate value in order to what adjust this image.
8. the method for dynamic image scanning as claimed in claim 6, it is characterized in that: described after-treatment device comprises one at least and strengthens/weaken circuit, in order to adjusting the gray scale of this image, this enhancing/weaken circuit has an input end to receive an enhancing/attenuated signal.
9. the method for dynamic image scanning as claimed in claim 6, it is characterized in that: described parameter group comprise at least time shutter, this light source of this light source exposure intensity, a DC current gain value, a black reference signal value, a white reference signal value, this adds agate (Gamma) value, and this enhancing/attenuated signal.
10. the method for a dynamic image scanning is characterized in that, this method comprises at least:
Form an image scanning system in order to scan image, this image scanning system comprises at least: a light source, in order to illuminate the image of one scan; One photo-detector, it is coupled to this light source, in order to survey the image that this illuminates; One gain amplifier, it is connected to photo-detector, and in order to adjust the DC current gain of this image, this gain amplifier has an input end, in order to adjust this DC current gain; One analog-digital converter, it is connected with gain amplifier, and to the numerical digit form, this analog-digital converter has two input ends to receive black reference signal and white reference signal in order to the analog form of converted image; One after-treatment device, it is connected with analog-digital converter, in order to handle the image after this conversion;
Used for one first time shutter, make scan image for the first time, to form one first image;
Used for one second time shutter, make scan image for the second time, to form one second image, this first time shutter is short than this second time shutter; And
With this first image and this second image addition, to form a composograph.
11. the method for dynamic image scanning as claimed in claim 10 is characterized in that: described after-treatment device comprises one at least and adds the agate correcting circuit, adds the agate value in order to what adjust this image.
12. the method for dynamic image scanning as claimed in claim 10, it is characterized in that: described after-treatment device comprises one at least and strengthens/weaken circuit, in order to adjusting the gray scale of this image, this enhancing/weaken circuit has an input end to receive an enhancing/attenuated signal.
13. the method for dynamic image scanning as claimed in claim 10, it is characterized in that also comprising: adjust one group of parameter in described second time in the scan image, wherein above-mentioned parameter group comprise at least this light source exposure intensity, a DC current gain value, a black reference signal value, a white reference signal value, this adds agate value, and this enhancing/attenuated signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97115409 CN1089923C (en) | 1997-07-17 | 1997-07-17 | Dynamic image scanning method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97115409 CN1089923C (en) | 1997-07-17 | 1997-07-17 | Dynamic image scanning method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1206162A CN1206162A (en) | 1999-01-27 |
| CN1089923C true CN1089923C (en) | 2002-08-28 |
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|---|---|---|---|
| CN 97115409 Expired - Fee Related CN1089923C (en) | 1997-07-17 | 1997-07-17 | Dynamic image scanning method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7440146B2 (en) | 2001-09-20 | 2008-10-21 | Transpacific Ip, Llp | Scanning method and scanning system free of identifying original's attribute |
| CN100504913C (en) * | 2002-01-23 | 2009-06-24 | 宇东科技股份有限公司 | Method and system for automatic scanning according to files attribute |
| CN101882212B (en) * | 2010-06-01 | 2012-12-12 | 福建新大陆电脑股份有限公司 | Method for acquiring barcode image |
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