CN1581210A - Method and apparatus of scanning using multiple gamma function to conduct gamma correction - Google Patents
Method and apparatus of scanning using multiple gamma function to conduct gamma correction Download PDFInfo
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- CN1581210A CN1581210A CN 03142145 CN03142145A CN1581210A CN 1581210 A CN1581210 A CN 1581210A CN 03142145 CN03142145 CN 03142145 CN 03142145 A CN03142145 A CN 03142145A CN 1581210 A CN1581210 A CN 1581210A
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Abstract
The present invention relates to a scanning method for utilizing multiple gamma function to make gamma correction. Said method includes the following steps: using several sense component groups to scan a file to obtain several groups of preimage signals, every sense component group includes several sense elements so as to sense light ray of same colour in same time point; taking out several gamma functions which are stored in an internal memory and correspondent to all the sense component groups; and according to these gamma functions respectively correcting said several groups of preimage signals into several groups of after-image signals. Said invention also provides the scanning devie for using said scaning method.
Description
Technical field
The present invention relates to a kind of scan method and scanister, relate in particular to a kind of scan method and scanister that utilizes multiple gal sign indicating number (gamma) function to carry out gamma correction.
Background technology
Along with the require increasingly stringent of user for quality of scanning, traditional scanister can't satisfy user's demand.The image signal that the CCD of scanister or CIS image sensor are received must be made highlights earlier and proofread and correct (WhiteCalibration) and dark portion correction (Dark Calibration), remakes gamma correction then, to obtain real image signal.Traditional scanister has an image sensor usually, and this image sensor inside can comprise the sense component groups of redness, green, blueness and/or black and white.For the image signal that several sense component groups captured of same colour system, only use corresponding to the pairing gamma curve of the sense component groups of this colour system certainly and make gamma correction.
Above-mentioned image sensor also can be a kind of alternating expression (staggered-type) image sensor.This alternating expression image sensor has the sense component groups of two configured in parallel, in order to the image signal of the same colour system of sensing.Several sensing units of these two sense component groups are interconnected, and making what win sense component groups institute sensing is the image signal of odd number group, and second sense component groups institute sensing is the image signal of even number set.
Fig. 1 is a kind of standard pattern in order to the correcting image shade of gray.As shown in Figure 1, this standard pattern 100 has six block P1 to P6, and these six blocks have the correcting pattern of different GTG values (brightness) separately.For example, the GTG value of block P1 to P6 is to increase gradually.This standard pattern 100 is to use for the image sensor sensing, and utilizes the actual signal of sensing gained to come to make gamma curve and gal sign indicating number function corresponding to this image sensor with the standard signal of correcting pattern.
Fig. 2 is the brightness that produced behind the standard pattern of two image sensor sensing Fig. 1 and the curve map of block.As shown in Figure 2, transverse axis is represented section P1 to P6, and the longitudinal axis is represented brightness, and curve 110 is the sensing result corresponding to first sense component groups, curve 120 is the sensing result corresponding to second sense component groups, and curve 130 is the genuine properties corresponding to standard pattern 100.
Because the characteristic of foozle and image sensor itself makes first and second sense component groups can have suitable difference, and make that curve 110 and 120 can deflection curve 130.Especially not that the difference that is caused is obvious especially under the situation about finishing in same processing procedure two sense component groups.
Fig. 3 is two image sensor institute sensed result.As shown in Figure 3, when using first and second sense component groups that the pattern with same gray level degree is scanned, will produce the fragment pattern 140 and 150 of two kinds of different brightness.
In above-mentioned alternating expression image sensor, the pattern that two sense component groups carry out being obtained behind the sensing is different.Moreover, because the design considerations of the scanister of known technology there is no the height requirement that this case of being similar to is arranged for quality of scanning, so the gamma correction of known technology foundation is to make gamma correction according to one of them sense component groups.So, cause odd number image signal and the even number image signal situation of difference to some extent easily, and these differences are quite unacceptable for some professional person that this case locked.
Summary of the invention
Therefore, an object of the present invention is to provide and a kind ofly utilize multiple gal sign indicating number function to carry out the scan method and the scanister of gamma correction, with reduce foozle for the influence of quality of scanning, promote the quality of scanning of scanister and satisfy various users' demand.
For reaching above-mentioned purpose, the invention provides and a kind ofly utilize multiple gal sign indicating number function to carry out the scan method of gamma correction, comprise following steps: scan a file by several sense component groups, with image signal before the acquisition array, respectively this sense component groups comprises several sensing units, in order to the whole-colored light of sensing; Taking-up be stored in an internal memory corresponding to several gal sign indicating number functions of this sense component groups respectively; And with image correction signal before this array respectively image signal after the array according to these gal sign indicating number functions.
For reaching above-mentioned purpose, the present invention also provides a kind of and utilizes multiple gal sign indicating number function to carry out the scanister of gamma correction, and this scanister comprises several sense component groups, an internal memory and a treatment circuit.These sense component groups are in order to scan a file, with image signal before the acquisition array.Respectively this sense component groups comprises several sensing units, in order to put the whole-colored light of sensing at one time.This internal memory is in order to store corresponding to several gal sign indicating number functions of this sense component groups respectively.This treatment circuit is to be respectively image signal after the array with image correction signal before this array according to these gal sign indicating number functions.
According to using multiple gal sign indicating number function to carry out gamma correction, can effectively stop the influence that inhomogeneous characteristic caused of different sense component groups.
Description of drawings
Fig. 1 is a kind of standard pattern in order to the correcting image shade of gray;
Fig. 2 is the brightness that produced behind the standard pattern of two image sensor sensing Fig. 1 and the curve map of block;
Fig. 3 is two image sensor institute sensed result;
Fig. 4 utilizes multiple gal sign indicating number function to carry out the process flow diagram of the scan method of gamma correction;
Fig. 5 is the synoptic diagram of the scanister of the embodiment of the invention one;
Fig. 6 is the synoptic diagram of the scanister of the embodiment of the invention two;
Fig. 7 is the synoptic diagram of the scanister of the embodiment of the invention three.
Concrete embodiment
The present invention utilizes above-mentioned standard pattern 100 to produce gal sign indicating number function.Section number that it should be noted that standard pattern 100 can be to adjust according to demand, and is not limited to six.
Fig. 4 utilizes multiple gal sign indicating number function to carry out the process flow diagram of the scan method of gamma correction.As shown in Figure 4, a kind of scan method of utilizing multiple gal sign indicating number function to carry out gamma correction of the present invention comprises following steps.
Step S40: produce several gal sign indicating number functions.In this step, be to have several correcting patterns of different shade of gray and obtain several analog correction signals with several sense component groups scannings.Then, these analog correction signals are converted to several figure adjustment signals.Then, obtain these gal sign indicating number functions according to these correcting patterns and these figure adjustment signals corresponding to several image sensors.Gal sign indicating number function can be stored in the internal memory of scanister, as the foundation of carrying out gamma correction future.
Step S41: scan a file.In this step, with these several sense component groups scanning this document, with image signal before the acquisition array.Respectively this sense component groups comprises several sensing units, in order to the whole-colored light of sensing.
Step S42; Taking-up be stored in this internal memory corresponding to these gal sign indicating number functions of this sense component groups respectively.
Step S43: according to these gal sign indicating number functions is respectively image signal after the array with image correction signal before this array.These back image signals promptly truly correspond to the document image that is scanned.
Known technology thinks that the characteristic of each sense component groups is identical, thus think that the gal sign indicating number function of each sense component groups is also identical, so only get the correction foundation that the gal sign indicating number function of one of them sense component groups is used as the signal of all sense component groups institute sensings.Therefore, known technology also can't satisfy the requirement of high quality of scanning.By contrast, in said method of the present invention, be to utilize the different gal sign indicating number function of these sense component groups to be used as the correction foundation of the signal of these sense component groups institute sensings.Therefore, the signal that each sense component groups sensed is to proofread and correct according to the characteristic of each sense component groups, can really reflect the image of the file that will scan.It should be noted that step S40 can be finished before scanister dispatches from the factory, and this scanister only needs execution in step S41 to S43 to get final product when doing scanning.
According to using above-mentioned scan method, scanister of the present invention is described as follows.
Fig. 5 is the synoptic diagram of the scanister of the embodiment of the invention one.As shown in Figure 5, the scanister of embodiment one comprises an image sensor 50, a treatment circuit 51 and an internal memory 52.Image sensor 50 comprises two sense component groups 53 and 54, in order to scan a file, with image signal before the acquisition array.Sense component groups 53 comprises several sensing units 55, and sense component groups 54 comprises several sensing units 56, and each sensing unit 55 and 56 is in order to put the whole-colored light of sensing at one time.For example, sensing unit 55 and 56 all is in order to sensing black and white, redness, green or blue light.It should be noted that, image sensor 50 can comprise in order to sensing black and white, redness, green, and four groups of the sense component groups 53 and 54 of blue ray totally, or in order to sensing redness, green, and totally three groups of the sense component groups 53 and 54 of blue ray, with so that this scanister can carry out chromoscan.
In the present embodiment, these sensing units 55 and 56 are interconnected, and are arranged in two straight lines.The preceding image signal that these 55 sensings of sensing unit obtain is the odd number group image signal, and the preceding image signal that these 56 sensings of sensing unit obtain is the even number set image signal.The even number set image signal is interted between the odd number group image signal, can obtain the image signal of a sweep trace.
Internal memory 52 is in order to store several gal sign indicating number functions corresponding to this sense component groups 53 respectively and 54.Treatment circuit 51 is respectively image signal after the array with image correction signal before this array according to these gal sign indicating number functions.The mode that several gal sign indicating number functions can see through treatment circuit 51 and the described step S40 of Fig. 4 obtains, and is stored in the internal memory 52.
Fig. 6 is the synoptic diagram of the scanister of the embodiment of the invention two.As shown in Figure 6, the scanister of present embodiment and embodiment one are similar, and difference is that the image sensor 60 of present embodiment comprises several sense component groups 61 to 65, and the 61A to 65A of several sensing units of sense component groups 61 to 65 arranges in line.Sense component groups 61 to 65 may be to finish under different processing procedures, is packaged into image sensor 60 again, therefore may have difference slightly.61 to 65 image signals that sensing obtains of each sense component groups also carry out gamma correction according to the pairing gal sign indicating number of this sense component groups function.It should be noted that image sensor 60 also can comprise three groups or four groups of sense component groups 61 to 65 of configured in parallel, in order to sensing redness, blueness, green and black and white light.
Though above-mentioned sense component groups 61 to 65 is to belong to Charged Coupled Device (CCD) formula sense component groups, respectively several sensing units of this sense component groups are specially in order to the whole-colored light of sensing.But in other embodiments, sense component groups 61 to 65 also can belong to contact image sensor (CIS) formula sense component groups.When sense component groups 61 to 65 is CIS formula sense component groups, the light of at least three kinds of different colours of the 61A to 65A of sensing unit wheel current sense.Yet, point at one time, 61A to 65A institute of sensing unit sensing be the light of same color.At this moment, each sense component groups 61 to 65 can have gal sign indicating number function corresponding to three kinds of colors such as redness, green, bluenesss for correction, maybe can have gal sign indicating number function corresponding to white for correction, maybe can have corresponding to red, green, blue, white gal sign indicating number function for correction.
Fig. 7 is the synoptic diagram of the scanister of the embodiment of the invention three.As shown in Figure 7, the scanister of present embodiment and embodiment one are similar, and difference is that the image sensor 70 of present embodiment comprises several sense component groups 71 to 76, and the 71A to 76A of several sensing units of sense component groups 71 to 76 is arranged in two straight lines.Sense component groups 71 to 76 may be to finish under different processing procedures, is packaged into image sensor 70 again, therefore may have difference slightly.71 to 76 image signals that sensing obtains of each sense component groups also carry out gamma correction according to the pairing gal sign indicating number of this sense component groups function.It should be noted that image sensor 70 also can comprise three groups or four groups of sense component groups 71 to 76 of configured in parallel, in order to sensing redness, blueness, green and black and white light.
Above-mentioned each gamma correction function corresponding to each sense component groups can be to depend on the average characteristics of all sensing units, the wherein characteristic of single sensing unit or the characteristic of all sensing units.Certainly, to proofread and correct according to the gal sign indicating number function of itself be preferred mode to the signal that each sensing unit is sensed.
The specific embodiment that is proposed in the detailed description of preferred embodiment is only in order to convenient explanation technology contents of the present invention, but not with narrow sense of the present invention be limited to the foregoing description, in the situation that does not exceed spirit of the present invention and following claim, the many variations of being done is implemented, and all belongs to scope of the present invention.
Symbol description
S40～step
S41～step
S42～step
S43～step
P1-P6～section
50,60,70～image sensor
51～treatment circuit
52～internal memory
55,56,61A-65A, 71A-76A～sensing unit
53,54,61-65,71-76～sense component groups
100～correcting pattern
110,120,130～curve
140,150～fragment pattern
Claims (11)
1. one kind is utilized multiple gal sign indicating number function to carry out the scan method of gamma correction, it is characterized in that, comprises following steps:
Scan a file with several sense component groups, with image signal before the acquisition array, each described sense component groups comprises several sensing units, in order to put the whole-colored light of sensing at one time;
Taking-up is stored in several gal sign indicating number functions corresponding to each described sense component groups of an internal memory; And
According to described these gal sign indicating number functions is respectively image signal after the array with image correction signal before the described array.
2. as claimed in claim 1ly utilize multiple gal sign indicating number function to carry out the scan method of gamma correction, it is characterized in that, also comprise following steps:
Have several correcting patterns of different shade of gray and obtain several analog correction signals with described sense component groups scanning;
Described analog correction signal is converted to several figure adjustment signals; And
Obtain described gal sign indicating number function according to described correcting pattern and described figure adjustment signal.
3. as claimed in claim 1ly utilize multiple gal sign indicating number function to carry out the scan method of gamma correction, it is characterized in that described several sense component groups are the alternating expression sense component groups, and described several sensing identical permutation of described several sense component groups become two straight lines.
4. as claimed in claim 1ly utilize multiple gal sign indicating number function to carry out the scan method of gamma correction, it is characterized in that described several sensing identical permutation of described several sense component groups in line.
5. as claimed in claim 1ly utilize multiple gal sign indicating number function to carry out the scan method of gamma correction, it is characterized in that, described several sensing identical permutation of described several sense component groups become two straight lines, and described several sensing units that are located along the same line are in order to the described preceding image signal of sensing corresponding to same sweep trace.
6. one kind is utilized multiple gal sign indicating number function to carry out the scanister of gamma correction, it is characterized in that, comprises:
Several sense component groups, in order to scan a file, with image signal before the acquisition array, wherein each described sense component groups comprises several sensing units, in order to put the whole-colored light of sensing at one time;
One internal memory is in order to store several gal sign indicating number functions corresponding to each described sense component groups; And
One treatment circuit is respectively image signal after the array with image correction signal before the described array according to described gal sign indicating number function.
7. as claimed in claim 6ly utilize multiple gal sign indicating number function to carry out the scanister of gamma correction, it is characterized in that described several sense component groups are the alternating expression sense component groups, described several sensing identical permutation of described several sense component groups become two straight lines.
8. as claimed in claim 6ly utilize multiple gal sign indicating number function to carry out the scanister of gamma correction, it is characterized in that described several sensing identical permutation of described several sense component groups in line.
9. as claimed in claim 6ly utilize multiple gal sign indicating number function to carry out the scanister of gamma correction, it is characterized in that, described several sensing identical permutation of described several sense component groups become two straight lines, and described several sensing units that are located along the same line in order to sensing corresponding to image signal before same sweep trace described etc.
10. as claimed in claim 6ly utilize multiple gal sign indicating number function to carry out the scanister of gamma correction, it is characterized in that described several sense component groups are Charged Coupled Device (CCD) formula sense component groups.
11. as claimed in claim 6ly utilize multiple gal sign indicating number function to carry out the scanister of gamma correction, it is characterized in that described several sense component groups are contact image sensor (CIS) formula sense component groups.
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| CNB031421458A CN100418101C (en) | 2003-08-08 | 2003-08-08 | Method and apparatus of scanning using multiple gamma function to conduct gamma correction |
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| CNB031421458A CN100418101C (en) | 2003-08-08 | 2003-08-08 | Method and apparatus of scanning using multiple gamma function to conduct gamma correction |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105243999A (en) * | 2014-07-10 | 2016-01-13 | 捷达创新股份有限公司 | Driving display method of liquid crystal display |
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| JPH05191675A (en) * | 1992-01-14 | 1993-07-30 | Canon Inc | Gamma correction circuit and image pickup device using the circuit |
| JP2002199246A (en) * | 2001-11-05 | 2002-07-12 | Konica Corp | Image pickup device |
| JP2003219269A (en) * | 2002-01-22 | 2003-07-31 | Sanyo Electric Co Ltd | Video camera with gamma correction switching function |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105243999A (en) * | 2014-07-10 | 2016-01-13 | 捷达创新股份有限公司 | Driving display method of liquid crystal display |
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