CN106412375A - Image processing apparatus and image quality adjusting method - Google Patents
Image processing apparatus and image quality adjusting method Download PDFInfo
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- CN106412375A CN106412375A CN201510464385.1A CN201510464385A CN106412375A CN 106412375 A CN106412375 A CN 106412375A CN 201510464385 A CN201510464385 A CN 201510464385A CN 106412375 A CN106412375 A CN 106412375A
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- Prior art keywords
- image
- reading
- correction factor
- face
- sheet material
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/387—Composing, repositioning or otherwise geometrically modifying originals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/46—Colour picture communication systems
- H04N1/56—Processing of colour picture signals
- H04N1/60—Colour correction or control
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/46—Colour picture communication systems
- H04N1/56—Processing of colour picture signals
- H04N1/60—Colour correction or control
- H04N1/6075—Corrections to the hue
Abstract
The embodiment relates to an image processing apparatus and an image quality adjusting method. The image processing apparatus of the embodiment includes a first reading portion, a second reading portion, a correction coefficient deriving portion, and a control portion. The first reading portion reads an image of the first surface of a sheet conveyed by an automatic manuscript conveying device. The second reading portion reads an image of the second surface, different from the first surface, of the sheet. The correction coefficient deriving portion derives, based on the image read from the first surface, a correction coefficient used by the second reading portion reading the second surface. The second reading portion performs reading by using the derived correction coefficient.
Description
Technical field
Implementations described herein relates generally to image processing apparatus, image quality adjustment method.
Background technology
In the past, it is known to MFP (the Multi Function on the two sides that can simultaneously read sheet material
) etc. Peripheral image processing apparatus.In such image processing apparatus, by possessing surface
With image read-out and the back side with image read-out realize the two sides of sheet material and read simultaneously.
However, in the image read-out on surface and the image read-out at the back side, there is reading
Take sensor, lens and the different situation of light source.In such case it is possible to generation surface
Poor with the image quality at the back side.Even if in the situation constituting 2 above-mentioned image read-outs with device of the same race
Down it is also possible to produce same problem.
Content of the invention
A kind of image processing apparatus, possess：First reading part, reads defeated by auto document feeder
The image in the first face of the sheet material sending, the second reading part, reads as the first face with described sheet material not
The image in same second face in face, and correction factor leading-out portion, based on read from described first face
Image, the correction factor using during described second reading part described second face of reading of derivation, described second
Reading part executes reading using the described correction factor derived.
A kind of image quality adjustment method, including：First read step, reads by auto document feeder
The image in first face of sheet material of conveying, the second read step, reads as first with described sheet material
The image in second face in the different face in face, and correction factor deriving step, based on from described first face
The image reading, derives the correction system using when reading described second face in described second read step
Number, in described second read step, executes reading using the described correction factor derived.
Brief description
Fig. 1 is the outside drawing of the overall structure example of image processing apparatus 100 illustrating embodiment.
Fig. 2 is the block diagram of the functional structure of image processing apparatus 100 illustrating embodiment.
Fig. 3 is the skeleton diagram of the configuration example illustrating image reading unit 200.
Fig. 4 is the schematic block diagram of the functional structure representing control device 101.
Fig. 5 is the flow chart of the flow process of the action illustrating image processing apparatus 100.
Fig. 6 is the flow chart of the flow process of the action illustrating image processing apparatus 100.
Fig. 7 is the flow chart illustrating the flow process of the action of image processing apparatus 100 in variation.
Fig. 8 is the flow chart illustrating the flow process of the action of image processing apparatus 100 in variation.
Specific embodiment
The image processing apparatus of embodiment have the first reading part, the second reading part, correction factor are led
Go out portion and control unit.First face of the sheet material that the first reading part reading is conveyed by auto document feeder
Image.Second reading part reads the figure in the second face of the not coplanar in the first face as described sheet material
Picture.Correction factor leading-out portion, based on the image reading from described first face, derives described second reading part
The correction factor using in the reading in described second face.Described second reading part is described using derive
Correction factor executes reading.
Hereinafter, with reference to the accompanying drawings of the image processing apparatus of embodiment, image quality adjustment method and non-face
When property recording medium.
Fig. 1 is the outside drawing of the overall structure example of image processing apparatus 100 illustrating embodiment.Figure
As processing meanss 100 are, for example, the image processing system of compounding machine etc..Image processing apparatus 100 possess
Display 110, control panel 120, printer portion 130, sheet material receiving portion 140 and image reading unit
200.Additionally, the printer portion 130 of image processing apparatus 100 can make toner image fixing
Device or the device of ink jet type.
Image processing apparatus 100 read the image being shown on sheet material and generate numerical data, generate figure
As file.Sheet material e.g. describes paper of original copy, word or image etc. etc..As long as sheet material image
The object that processing meanss 100 can read gets final product or object other than the above.
Display 110 is liquid crystal display, organic EL (Electro Luminescence) display
Deng image display device.The display 110 display various information related to image processing apparatus 100.
Control panel 120 has multiple buttons.The operation of control panel 120 receive user.Chain of command
Plate 120 will be filled with the control operating corresponding signal output to image processing apparatus 100 that user is carried out
Put.Additionally, display 110 and control panel 120 may be configured as the touch panel of one.
Printer portion 130 is based on the view data being generated by image reading unit 200 or via communication line
The view data receiving, forms image on sheet material.Printer portion 130 is using for example following process
Form image.The image forming part in printer portion 130 is formed quiet on photoconductor drum based on view data
Electric sub-image.The image forming part in printer portion 130 is formed visually by adhering to developer in electrostatic latent image
Picture.As the specific example of developer, there is toner.The transfer section in printer portion 130 can video
It is transferred on sheet material.The fixed part in printer portion 130, can by being heated to sheet material and pressurizeing
Video is fixed on sheet material.Additionally, the sheet material being formed with image can be accommodated in sheet material receiving portion 140
Sheet material or the sheet material being manually inserted.
Sheet material receiving portion 140 accommodates the sheet material being formed for the image in printer portion 130.
The view data of reading object is read as the light and shade of light by image reading unit 200.Image reading unit
The view data that 200 records read.The view data of record can be sent at other information via network
Reason device.The view data of record can carry out image on sheet material by printer portion 130 and be formed.Image
Reading part 200 reads view data from the surface of sheet material and the back side.
In addition, image reading unit 200 is repaiied using by carrying out shading (shading) when reading sheet material
Coefficient obtained by just, reads the surface of sheet material and the view data at the back side.In the following description, will
Obtained by shading correction, the coefficient on surface is designated as surface correction factor.In addition, saying in following
In bright, the coefficient at the back side obtained by shading correction is designated as back side correction factor.
Fig. 2 is the block diagram of the functional structure of image processing apparatus 100 illustrating embodiment.
Image processing apparatus 100 possess control device 101, network interface 102, auxilary unit
103rd, display 110, control panel 120, image reading unit 200, printer portion 130, sheet material
Receiving portion 140 and memory 104.Each function part bus internally that image processing apparatus 100 possess
1 connection, can carry out mutually the input and output of data.Additionally, to the function part being illustrated in Figure 1,
Add the symbol same with Fig. 1 and omit the description.
Control device 101 controls the action of each function part of image processing apparatus 100.Control device 101
Execute various process by configuration processor.The specific structure of control device 101 is in rear description.
Carry out the transmitting-receiving of data between network interface 102 and other devices.Network interface 102 is as defeated
Incoming interface and action, receive the data sending from other devices.In addition, network interface 102 is as defeated
Outgoing interface and action, send data to other devices.
Auxilary unit 103 is such as hard disk or SSD (solid state drive), stores various numbers
According to.Various data are, for example, view data etc..View data is the numeral that image reading unit 200 generates
Data.
Memory 104 is, for example, RAM (Random Access Memory).Memory 104 is interim
The data that each function part that storage image processing meanss 100 possess uses.Additionally, memory 104
Can storage image reading part 200 generate numerical data.
Fig. 3 is the skeleton diagram of the configuration example illustrating image reading unit 200.
Image reading unit 200 possesses ADF (Auto Document Feeder：Auto document conveying dress
Put) 10, document board 20, the 1st balladeur train 21, the 2nd balladeur train 22 and shoot part 23.Here, ADF10
It is surface reading device, document board 20, the 1st balladeur train 21, the 2nd balladeur train 22 and shoot part 23 structure
Become surface reading device.
First, the structure of ADF10 is described.
ADF10 possesses sheet material supply unit 150 and sheet material discharge unit 160.Sheet material supply unit 150 is by holding
Section 150a, pick-up roller 151, compress roller 152a, compress roller 152b, conveying roller 153a, conveying
Roller 153b, conveying roller 153c, band conveyance drum 154, scan module 155, standard white roller 156 are constituted.
Loading end 150a is the face carrying sheet material.
The sheet material being carried on loading end 150a is supplied to downstream by pick-up roller 151 a sheet by a sheet.
Compressing roller 152a and 152b makes the front end of the sheet material from pick-up roller 151 supply neat.Compress roller
Sheet material neat for front end is passed out to conveying roller 153a by 152a and 152b.Additionally, in the following description
In, in the case of not distinguishing and compressing roller 152a and 152b, it is designated as compressing roller 152.
Conveying roller 153a, 153b and 153c pass through to turn clockwise sheet material is passed out to sheet material discharge unit
160.Additionally, in the following description, in the feelings not distinguishing conveying roller 153a, 153b and 153c
Under condition, it is designated as conveying roller 153.
With conveyance drum 154 located at conveying roller 153 opposed locations.Band conveyance drum 154 is as shown in arrow
Direction rotate, sheet material is passed out to sheet material discharge unit 160.
Scan module 155 reads the view data at the back side of sheet material.Scan module 155 is used using the back side
Correction factor reads the view data at the back side of sheet material.In addition, scan module 155 is according to control device
101 control, reads the view data at the back side of sheet material using the coefficient that control device 101 is derived,
Generate the view data at the back side.
Standard white roller 156 is that the part of white is constituted.Standard white roller 156 has to reading from sheet material
Image (hereinafter referred to as " reading image ") carries out the white as benchmark during shading correction.
Sheet material discharge unit 160 is storaged the sheet material sent by conveying roller 153.
Then, illustrate that hand puts the structure of original document reading apparatus.
Hand is put original document reading apparatus and is possessed document board 20, the 1st balladeur train 21, the 2nd balladeur train as mentioned above
22 and shoot part 23.The direction of the 1st balladeur train 21 movement is sub-scanning direction y.In document board 20
In, the direction orthogonal with sub-scanning direction y is main scanning direction x.Sweep with main scanning direction x and pair
Retouching the orthogonal direction of direction y is short transverse z.
Document board 20 possesses manuscript table glass 201, shading plate 202, original copy scale 203 and reads glass
Glass 204.
Manuscript table glass 201 has the loading end 201a carrying sheet material.
Shading plate 202 is made up of white part.Shading plate 202 have to read image carry out shading
As the white of benchmark during correction.Shading plate 202 has long shape in main scanning direction x.
Original copy scale 203 represents the position of the sheet material being carried on manuscript table glass 201.In original copy scale
203 end is provided with front end reference section 203a.Front end reference section 203a is passed through in manuscript table glass 201
Loading end 201a between formed step difference, formed abut sheet material end protuberance.Sheet material passes through
Front end reference section 203a is abutted on manuscript table glass 201 to determine position.In loading end 201a
The position at the upper predetermined angle of front end carrying sheet material.By in predetermined position carry sheet material
Front end angle, realize main scanning direction x and the positioning of sub-scanning direction y.
1st balladeur train 21 possesses light source 211, reflector 212 and the 1st mirror 213.Light source 211
Light.Reflector 212 reflects the light sending from light source 211.The light being reflected by reflector 212 is to shading
Plate 202 and sheet material uniform irradiation.Based on the reflected light of the light irradiating, in the reading position of adjustment sheet material
Main scanning direction x light distribution characteristic.1st mirror 213 will be reflected by shading plate 202 and sheet material
Light reflects towards the 2nd mirror 221 of the 2nd balladeur train 22.
2nd balladeur train 22 possesses the 2nd mirror 221 and the 3rd mirror 222.2nd mirror 221 will be by
The light of 1 mirror 213 reflection reflexes to the 3rd mirror 222.3rd mirror 222 will be by the 2nd mirror 221
The light of reflection reflexes to the light collecting lens 231 of shoot part 23.
Shoot part 23 possesses light collecting lens 231, ccd sensor 232 and CCD substrate 233.Collection
Optical lens 231 assembles the light being reflected by the 3rd mirror 222.Light collecting lens 231 make the light of gathering exist
Imaging surface (reading face) imaging of ccd sensor 232.
Ccd sensor 232 is arranged on CCD substrate 233.For example, ccd sensor 232
It is mixing 4 line sensors.Mix 3 line sensors and the reading that 4 line sensors include reading coloured image
Take 1 line sensor of monochrome image.3 line sensors read R (red), G (green) and B (blue)
Light.Ccd sensor 232 will switch to electric charge by the light that light collecting lens 231 are imaged.By this turn
Change, ccd sensor 232 will be converted to electric signal by the image that light collecting lens 231 are imaged.
CCD substrate 233 generates based on by the electric signal that the opto-electronic conversion of ccd sensor 232 generates
View data.CCD substrate 233 uses surface correction factor to read the picture number on the surface of sheet material
According to the view data on generation surface.The view data of generation is exported control by CCD substrate 233
Device 101.The above-mentioned place reason that CCD substrate 233 is carried out is arranged on the AFE on CCD substrate 233
(Analog Front End, AFE(analog front end)) executes.
Control device 101 controls the 1st balladeur train 21, the 2nd balladeur train 22 and shoot part 23.For example, control
Device 101 processed controls the movement of the 1st balladeur train 21, the lighting and put out of the light source 211 of the 1st balladeur train 21
Lamp.For example, control device 101 controls the action of shoot part 23.
Control device 101 is derived and is generated, in image reading unit 200, the new correction using during view data
Coefficient.More specifically, the revised view data of the shading based on surface for the control device 101, leads
Go out the 2nd back side correction factor.Then, control device 101 uses the 2nd back of the body in image reading unit 200
Face correction factor executes reading.
State from device (image processing apparatus 100) is controlled to usual state by control device 101
With low power state any one.Generally state is to read the image of original copy according to the instruction of user
State.In the normal state, it is arranged on timing sequencer on CCD substrate 233 by CCD control
Signal output is to ccd sensor 232.Low power state is can not be former according to the instruction reading of user
The image of original text, but the state lower than usual state power consumption.In a low-power state, it is arranged on
Timing sequencer on CCD substrate 233 stops.Therefore, in a low-power state, do not export CCD
Control signal.Therefore, in a low-power state, the action of ccd sensor 232 stops.
1st balladeur train 21 moves to sub-scanning direction y according to the control of control device 101.2nd is sliding
Frame 22 is moved with 1/2 speed with the 1st balladeur train 21 equidirectional along with the mobile edge of the 1st balladeur train 21
Dynamic.Using such action, even the situation of the 1st balladeur train 21 movement, reach ccd sensor
The light path of the light of 232 imaging surface does not also change.That is, the 1st mirror 213, the 2nd mirror 221,
The light path of the light in the optical system of 3 mirrors 222 and light collecting lens 231 composition is fixing.Change speech
It, from loading end 201a to ccd sensor, the light path of 232 imaging surface is fixing.
For example, in the example in figure 3, the 1st balladeur train 21 moves from left to right along sub-scanning direction y.
Along with the movement to sub-scanning direction y of the 1st balladeur train 21, reading position P of sheet material is also moved
Dynamic.Therefore, reading position P moves from left to right along sub-scanning direction y.Reading position P is that master sweeps
Retouch the position of the amount of 1 line of direction x.Moved to sub-scanning direction y by reading position P,
On the imaging surface of ccd sensor 232, the image of reading position P of sheet material is imaged successively.CCD passes
Sensor 232 will be main scanning direction x's with the corresponding signal output of image of reading position P of imaging
The signal of the amount of 1 row.The overall picture number of the signal generation sheet material based on multiple row for the CCD substrate 233
According to.
Here, the specific structure of scan module 155 is described.Scan module 155 possess have above-mentioned
The 1st balladeur train of structure of the 1st balladeur train 21, the 2nd balladeur train 22 and shoot part 23, the 2nd balladeur train and
Shoot part.The process that 1st balladeur train and the 2nd balladeur train are carried out with the 1st balladeur train 21 and the 2nd balladeur train 22 is
Likewise, description will be omitted.Shoot part possesses light collecting lens, ccd sensor and CCD substrate.
The process that shoot part is carried out, the different point of the process just being carried out from above-mentioned shoot part 23 is said
Bright.
CCD substrate generates picture number based on by the electric signal that the opto-electronic conversion of ccd sensor generates
According to.When generating view data, CCD substrate uses back side correction factor, by reading sheet material
The view data at the back side is generating the view data at the back side.CCD substrate will be defeated for the view data generating
Go out to control device 101.The above-mentioned place reason that CCD substrate is carried out is arranged on the AFE on CCD substrate
Execution.
Fig. 4 is the schematic block diagram of the functional structure representing control device 101.
As shown in figure 4, control device 101 possesses acquisition unit 1011, detection unit 1012, revises system
Number calculating section 1013 and control unit 1014.
Acquisition unit 1011 obtains the view data of sheet material from scan module 155 and surface reading device.
The view data of acquisition is saved in memory 104 by acquisition unit 1011.
The view data based on the sheet material being saved in memory 104 for the detection unit 1012 carries out determination processing.
For example, the data of the several rows on the surface based on the sheet material being saved in memory 104 for the detection unit 1012,
Whether the fore-end on the surface of judgement sheet material is blank sheet of paper (white).Here, the data of several rows refers to
Start the data of the image of several rows from the reading fore-end of sheet material.In addition, if be the judgement of blank sheet of paper
For example it is carried out as follows.For example, the fore-end on the surface of sheet material pixel mean value predetermined
In the case of more than threshold value, detection unit 1012 judges that the fore-end on the surface of sheet material is blank sheet of paper.Separately
On the one hand, the situation of the mean value deficiency predetermined threshold of each pixel of the fore-end on the surface of sheet material
Under, detection unit 1012 judges the non-blank sheet of paper of fore-end on the surface of sheet material.Before the surface of sheet material
Partly in the case of non-blank sheet of paper, detection unit 1012 will be defeated for the result of determination comprising the meaning of non-blank sheet of paper at end
Go out to control unit 1013.On the other hand, in the case that the fore-end on the surface of sheet material is blank sheet of paper,
Detection unit 1012 will comprise to be that the result of determination of the meaning of blank sheet of paper exports control unit 1013.Following
Explanation in, note sheet material surface fore-end be front end surface part.
Control unit 1013 is based on result of determination and controls image reading unit 200.For example, in front end surface portion
In the case of dividing expression to be not blank sheet of paper, control unit 1013 uses the back side to revise in scan module 155
Coefficient executes the reading at the back side of sheet material.In addition, in the case of representing that front end surface part is blank sheet of paper,
Control unit 1013 makes correction factor leading-out portion 1014 derive the 2nd back side correction factor.
The pixel based on the front end surface part preserving in memory 104 for the correction factor leading-out portion 1014
Level derives the 2nd back side correction factor.Pixel level is, for example, brightness value.
Fig. 5 and Fig. 6 is the flow chart of the flow process of the action illustrating image processing apparatus 100.Fig. 5 and
Execution in the case that image reading starts instruction is being made in the process of Fig. 6.Additionally, in Fig. 5 and Fig. 6
Process when starting, surface reading device and scan module 155 all carry out shading correction.
The image (ACT101) on the surface of sheet material that surface reading device reading is conveyed by ADF10.
Now, surface reading device uses surface correction factor to read the image on surface.Acquisition unit 1011
Obtain the data on the surface read.Thereafter, the data on the surface of acquisition is saved in by acquisition unit 1011
Memory 104 (ACT102).Detection unit 1012 judges whether the data of the several rows on surface is saved in and deposits
In reservoir 104 (ACT103).It is not held in the situation of memory 104 in the data of the several rows on surface
Under (ACT103：NO), the later process of execution ACT101 repeatedly.
On the other hand, the data in the several rows on surface is saved in (ACT103 in the case of memory 104：
YES), detection unit 1012 obtains the data of the several rows on surface.And, detection unit 1012 is based on and obtains
Whether the data judging front end surface part of the several rows on the surface taking is blank sheet of paper (ACT104).On surface
(ACT104 in the case of the non-blank sheet of paper of fore-end：NO), this intention is exported by detection unit 1012
Control unit 1013.Then, scan module 155 reads the figure at the back side of the sheet material being conveyed by ADF10
As (ACT105).Now, scan module 155 uses back side correction factor to read the image at the back side.
Thereafter, image processing apparatus 100 end is processed.
(ACT104 in the case of being blank sheet of paper in front end surface part：YES), detection unit 1012 will
This intention exports control unit 1013.Control unit 1013 is using the several rows being saved in memory 104
Data execution shading correction (ACT106).Control unit 1013 is by revised front end surface part
Pixel level is saved in memory 104 (ACT107).
Thereafter, scan module 155 reads the image at the back side of the sheet material being conveyed by ADF10
(ACT108).Now, scan module 155 uses back side correction factor to read the back side of sheet material
Image.Acquisition unit 1011 obtains the data at the back side read.Thereafter, acquisition unit 1011 by obtain
The data at the back side is saved in memory 104 (ACT109).Detection unit 1012 determines whether the back side
The data of several rows has been saved in memory 104 (ACT110).The data of several rows overleaf does not preserve
(the ACT110 in the case of memory 104：NO), the later process of execution ACT108 repeatedly.
On the other hand, the data of several rows overleaf is saved in (ACT110 in the case of memory 104：
YES), control unit 1013 obtains the data of the several rows at the back side.Then, control unit 1013 uses and obtains
The data execution shading correction of the several rows at the back side taking.Thereafter, control unit 1013 obtains shading correction
The pixel level of back side fore-end afterwards.Back side fore-end represents the leading section at the back side of sheet material
Point.Thereafter, the pixel level of the back side fore-end of acquisition is exported correction system by control unit 1013
Number leading-out portion 1014.Correction factor leading-out portion 1014 is based on the front end surface being saved in memory 104
Partial pixel level and the pixel level of back side fore-end, derive the 2nd back side correction factor
(ACT111).Specifically, before correction factor leading-out portion 1014 regulation correction factor makes the back side
The pixel level of end part is the pixel level identical level with front end surface part.In this wise, repair
Positive coefficient leading-out portion 1014 derives the 2nd back side correction factor.Then, control unit 1013 controls scanning
Module 155, executes the reading of the image at the back side using the 2nd back side correction factor derived.Then,
Scan module 155 reads sheet material according to controlling of control unit 1013 using the 2nd back side correction factor
The image (ACT112) at the back side.
In such image processing apparatus 100 constituting, can reduce surface and the back side image quality difference inclined
Difference.Hereinafter, illustrate detailed impression.
Image processing apparatus 100 are repaiied by shading based on from the front end surface part of the sheet material as blank sheet of paper
The just pixel level obtaining, derives the 2nd back side correction factor.2nd back side correction factor is derived
It is identical with the pixel level on surface.Therefore, the reading of image processing apparatus 100 image overleaf
In also using with surface reading approximately the same value correction factor.Therefore, it is possible to decrease surface and the back of the body
The deviation of the image quality difference in face.
Hereinafter, the variation of image processing apparatus 100 is described.
In the present embodiment, show that image processing apparatus 100 in the front end surface part of sheet material are
Derive the structure of the 2nd back side correction factor in the case of blank sheet of paper, but be not necessarily limited to this.For example,
Image processing apparatus 100 also in the condition deriving the 2nd back side correction factor, can add the back of the body of sheet material
The fore-end in face is the content of blank sheet of paper.
Constituted by such, the deviation of the image quality difference at surface and the back side can be reduced further.
In the present embodiment, show that image processing apparatus 100 carry out the front end surface based on sheet material
Whether part is the structure of the judgement of blank sheet of paper, but is not necessarily limited to this.For example, it is also possible to not be
Based on whether being blank sheet of paper, and using the condition whether having word, color whether dense etc..
In the present embodiment, show that image processing apparatus 100 read after the image reading surface
The structure of the image at the back side, is not necessarily limited to this.For example, image processing apparatus 100 can also structure
Become the image reading surface after the image reading the back side.In the case of such composition, scan mould
Block 155 will be to the front located at the position reading glass 204 for the position reading the sheet material conveying from ADF10
Side.In addition, in the case of such composition, correction factor leading-out portion 1014 is based on and is saved in storage
The pixel level of the back side fore-end of device 104 derives the 2nd surface correction factor.Derive method with
The deriving method of the 2nd back side correction factor is same.So constituted using Fig. 7 and Fig. 8 explanation
The process of the image processing apparatus 100 of situation.
Fig. 7 and Fig. 8 is the flow process illustrating the flow process of the action of image processing apparatus 100 in variation
Figure.Execution in the case that image reading starts instruction is being made in the process of Fig. 7 and Fig. 8.Additionally,
When the process of Fig. 7 and Fig. 8 starts, surface reading device and scan module 155 all carry out shading correction.
Scan module 155 reads the image (ACT201) at the back side of the sheet material being conveyed by ADF10.
Now, scan module 155 uses back side correction factor to read the image at the back side.Acquisition unit 1011
Obtain the data at the back side read.Thereafter, acquisition unit 1011 preserves the data at the back side obtaining to depositing
Reservoir 104 (ACT202).Detection unit 1012 judges whether the data of the several rows at the back side is saved in storage
Device 104 (ACT203).In the case that the data of several rows overleaf is not saved in memory 104
(ACT203：NO), the later process of execution ACT201 repeatedly.
On the other hand, the data of several rows overleaf is stored in (ACT203 in the case of memory 104：
YES), detection unit 1012 obtains the data of the several rows at the back side.Then, it is determined that portion 1012 is based on obtaining
The data of the several rows at the back side taking, judges whether back side fore-end is blank sheet of paper (white) (ACT204).
Overleaf fore-end is not (ACT204 in the case of blank sheet of paper：NO), this is anticipated by detection unit 1012
Purport exports control unit 1013.Then, the sheet material that reading device reading in surface is conveyed by ADF10
The image (ACT205) on surface.Now, surface reading device reads table using surface correction factor
The image in face.Thereafter, image processing apparatus 100 end is processed.
Overleaf fore-end is (ACT204 in the case of blank sheet of paper：YES), detection unit 1012 will
This intention exports control unit 1013.Control unit 1013 controls scan module 155, deposits to being saved in
Data execution shading correction (ACT206) of the several rows of reservoir 104.After control unit 1013 will be revised
The pixel level of back side fore-end be saved in memory 104 (ACT207).
Thereafter, the image on the surface of sheet material that reading device reading in surface is conveyed by ADF10
(ACT208).This when, surface reading device uses surface correction factor to read the surface of sheet material
Image.Acquisition unit 1011 obtains the data on the surface read.Thereafter, acquisition unit 1011 by obtain
The data on surface is saved in memory 104 (ACT209).Detection unit 1012 judges the several rows on surface
Whether data is saved in memory 104 (ACT210).It is not saved in the data of the several rows on surface and deposit
(ACT210 in the case of reservoir 104：NO), the later process of execution ACT208 repeatedly.
On the other hand, the data in the several rows on surface is saved in (ACT210 in the case of memory 104：
YES), control unit 1013 obtains the data of the several rows on surface.Then, control unit 1013 control table
Face reading device, the data execution shading correction to the several rows on the surface obtaining.Thereafter, control unit 1013
Obtain the pixel level of shading revised front end surface part.Thereafter, control unit 1013 will obtain
The pixel level of front end surface part export correction factor leading-out portion 1014.Correction factor leading-out portion
1014 pixel level based on the back side fore-end preserving in memory 104 and front end surface part
Pixel level, derive the 2nd surface correction factor (ACT211).Specifically, correction factor is led
Go out portion 1014 and adjust correction factor, make pixel level and the back side fore-end of front end surface part
Pixel level becomes phase same level.So, correction factor leading-out portion 1014 is derived the 2nd surface and is revised
Coefficient.Then, control unit 1013 control surface reading device, is revised using the 2nd surface derived
Coefficient executes the reading of the image on surface.Then, surface reading device is according to the control of control unit 1013
System reads the image (ACT212) at the back side of sheet material using the 2nd surface correction factor.
Constituted by such, image processing apparatus 100 can expect following effect.Specifically, that is,
Making is the image processing apparatus that first carry out of reading of the image of reading specific surface of the image making the back side
100, also can reduce the deviation of the image quality difference at surface and the back side.
According at least one embodiment described above, image processing apparatus 100 have the first reading
Portion's (for example, surface reading device), the second reading part (for example, scan module 155), Yi Jixiu
Positive coefficient leading-out portion 1014.First face (example of the sheet material that the first reading part reading is conveyed by ADF10
As surface) image.Second reading part reads as the second of the face different from the first face of sheet material
The image in face (for example, the back side).Correction factor leading-out portion 1014 is based on the figure reading from the first face
Picture, derives the correction factor using in the reading in the second face.Second reading part is using the correction derived
Coefficient executes reading, can reduce the deviation of the image quality difference at surface and the back side.
A part of work(of the image processing apparatus 100 in above-mentioned embodiment can be realized with computer
Energy.Now, can be used for realizing the program record of this function in computer readable recording medium storing program for performing.And,
Also can be by the program of record in the recording medium of record said procedure be read in computer system simultaneously
Execute and to realize.Additionally, " computer system " mentioned here comprises operating system or external equipment
Deng hardware.In addition, " computer-readable recording medium " refers to removable medium, storage device etc..
Removable medium is floppy disk, photomagneto disk, ROM, CD-ROM etc..In addition, storage device is interior
It is placed in hard disk of computer system etc..And " computer-readable recording medium " can be as via communication
Communication line in the case of circuit transmission program like that, dynamically keeps journey in the period of short time
Sequence.Communication line is the networks such as internet or telephone line etc..In addition, " computer-readable record is situated between
Matter " can also be the volatile storage of the inside computer system of server, client.Volatility
Memory can keep program in certain time.In addition said procedure can be to realize an above-mentioned part
The program of function.In addition, said procedure further can also be by above-mentioned function and already recorded in calculating
The combination of the program of machine system is realizing.
Although describing some embodiments herein, these embodiments are only example, and unexpectedly
For limiting the scope of the present invention.In fact, new embodiment described herein can be with other various forms
To embody, implementations described herein can be made with further omission, substitute and change and not
Depart from the intention of the present invention.Appended claim and its equivalents are intended to cover the meaning falling into the present invention
These forms of purport and modification.
Claims (10)
1. a kind of image processing apparatus, possess：
First reading part, reads the first face of sheet material being conveyed by auto document feeder
Image；
Second reading part, reads the second face as the face different from the first face of described sheet material
Image；And
Correction factor leading-out portion, based on the image reading from described first face, derives described the
Two reading parts read the correction factor using during described second face,
Described second reading part executes reading using the described correction factor derived.
2. image processing apparatus according to claim 1,
Described correction factor leading-out portion obtains to the predetermined quantity that described first reading part reads
Image executes revised first pixel level of shading and to described second reading part reading
Image execution revised second pixel level of shading of predetermined quantity, deriving makes described second
The correction factor that pixel level is phase same level with described first pixel level.
3. image processing apparatus according to claim 2, are also equipped with：
Detection unit, judges whether the image of the predetermined quantity that described first reading part reads meets
Predetermined condition,
Described correction factor leading-out portion is repaiied described in deriving in the case of meeting described predetermined condition
Positive coefficient.
4. image processing apparatus according to claim 3,
Described second reading part is in the case of meeting described predetermined condition using described in derivation
Correction factor executes reading, using by reading in the case of being unsatisfactory for described predetermined condition
Carry out correction factor execution described second obtained by shading correction before the image taking described second face
The reading of the image in face.
5. image processing apparatus according to claim 2,
The image of described predetermined quantity is the image starting several rows from the reading fore-end of sheet material
Data.
6. image processing apparatus according to claim 3,
Described predetermined condition is the pixel of the image of predetermined quantity that described first reading part reads
Mean value more than predetermined threshold value.
7. image processing apparatus according to claim 6,
Described detection unit also judges the picture of the image of predetermined quantity that described second reading part reads
Whether the mean value of element is more than predetermined threshold value.
8. image processing apparatus according to claim 1,
Described first reading part has the structure same with described second reading part.
9. a kind of image quality adjustment method, including：
First read step, reads the first face of the sheet material being conveyed by auto document feeder
Image；
Second read step, reads as the second of the face different from the first face of described sheet material
The image in face；And
Correction factor deriving step, based on the image reading from described first face, derives in institute
State in the second read step and read the correction factor using during described second face,
In described second read step, execute reading using the described correction factor derived.
10. image quality adjustment method according to claim 9,
In described correction factor deriving step, obtain and read in described first read step
Image execution revised first pixel level of shading of predetermined quantity and to described second
The image execution revised second pixel water of shading of the predetermined quantity reading in read step
Flat, deriving makes described second pixel level be repairing of phase same level with described first pixel level
Positive coefficient.
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Application publication date: 20170215 |