JP3780173B2 - Image processing apparatus and image processing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an image processing apparatus and an image processing method for reading an image recorded on a document and outputting the read image.
[0002]
[Prior art]
A conventional facsimile apparatus reads an image to be transmitted by a scanner, converts the read image to a predetermined resolution, and transmits the image. The predetermined resolution is determined by negotiation with the counterpart terminal in the pre-communication procedure.
[0003]
In the G3 facsimile apparatus, since the unit of resolution of the image to be communicated is a millimeter (mm) system, the scanner reads the image with a millimeter system resolution. In the G4 facsimile apparatus, since the unit of an image to be communicated is an inch system, the scanner reads the image with an inch resolution.
[0004]
By the way, when an image of 200 × 200 dpi (dots per inch) read by a G4 facsimile apparatus equipped with an inch-type scanner is transmitted to the G3 facsimile apparatus, 8 × 7.7 dpm (dots per) is determined by the G3 facsimile transmission procedure. An image having a resolution of (millimeter) is transmitted.
[0005]
Here, when an image read by the G4 facsimile apparatus is transmitted to the G3 facsimile apparatus as it is, the image is reduced to 97.5% (7.8 / 8%) in the main scanning direction, and in the sub scanning direction. A distorted image enlarged (elongated) to 101.3% (7.8 / 7.7%) is output from the G3 facsimile apparatus on the receiving side.
[0006]
On the other hand, when an 8 × 7.7 dpm image read by a G4 facsimile machine equipped with a millimeter-size scanner is sent to another G4 facsimile as it is, it is enlarged (elongated) in the main scanning direction and reduced in the sub-scanning direction. The distorted image in the processed state is output by the other G4 facsimile apparatus on the receiving side.
[0007]
Therefore, in order to correct the image distortion described above, the transmission side facsimile apparatus performs millimeter / inch conversion or inch / mm conversion of the image, corrects the image distortion, and then transmits the image.
[0008]
Specific examples for the above conversion are listed below.
[0009]
When an image read at a resolution of 200 × 200 dpi, which is an inch unit system, is transmitted in a standard mode (Std: 3.85 Line / mm × 8 Pel) of a millimeter unit system, the resolution in the main scanning direction is changed from 200 dpi to 203. 1 dpi (25.4 / 0.125) is converted, and the resolution in the sub-scanning direction is converted from 200 dpi to 97.8 dpi (25.4 / (1 / 3.85)) and transmitted.
[0010]
Further, when an image read at a resolution of 200 × 200 dpi that is an inch unit system is transmitted in a fine mode (Fine: 7.7 Line / mm × 8 Pel) of a millimeter unit system, the resolution in the main scanning direction is changed from 200 dpi. It converts to 203.1 dpi (25.4 / 0.125), and the resolution in the sub-scanning direction is converted from 200 dpi to 195.6 dpi (25.4 / (1 / 7.7)) and transmitted.
[0011]
Further, when an image read at a resolution of 200 × 200 dpi, which is an inch unit system, is transmitted in a super fine mode (S. Fine: 15.4 Line / mm × 8 Pel) of a millimeter unit system, the resolution in the main scanning direction is used. Is converted from 200 dpi to 203.1 dpi (25.4 / 0.125), and the resolution in the sub-scanning direction is converted from 200 dpi to 391.2 dpi (25.4 / (1 / 15.4)) and transmitted. .
[0012]
Next, a conventional image reading apparatus 200 having the resolution conversion function and using the equal magnification optical system will be described.
[0013]
FIG. 6 is a diagram illustrating a configuration of a conventional image reading apparatus 200.
[0014]
The image reading apparatus 200 includes a control board 201, an electric board composed of a main power source 202, a reading unit 203, and an operation unit 204.
[0015]
The reading unit 203 uses a document tray 205 on which the document 211 is set and stacked, an upper document guide 206, a lower document guide 207, a document separation unit 208 that sequentially feeds a plurality of documents 211, and a photoelectric conversion element. A contact sensor 209 and a reading reference plate 210 are provided.
[0016]
The upper document guide 206 is a guide for guiding the document 211 when the document 211 is conveyed, and the reading reference plate 210 is provided on the upper surface of the contact sensor 209 so as to face the contact sensor 209. Further, the reading reference plate 210 has a background color (background color) of the document 211.
[0017]
The contact sensor 209 is held by the main body frame 219 via the contact sensor holder 209a, and the reading reference plate 210 urges the document 211 toward the contact sensor 209 side by its own weight or a spring (not shown). It is like that.
[0018]
The reading unit 203 also feeds (conveys) the document separation roller 212, the preliminary conveyance plate 213, the friction piece 214, and the document 211 that are used to convey the document 211 one by one. It has a roller 215, a counter roller 216, a paper discharge roller 217, and a counter roller 218.
[0019]
Further, on the document discharge side, when the discharged document 211 is charged with static electricity, a static elimination brush 220 is provided to remove or reduce the static electricity.
[0020]
Documents 211 loaded on the document tray 205 are sandwiched between a document separation roller 212 and a preliminary transport plate 213 and separated one by one by friction pieces 214. The separated document 211 is conveyed by the feeding roller 215 and the opposing roller 216, passes between the contact sensor 209 and the reading reference plate 210, and is indicated by an arrow AR20 by the paper discharge roller 217 and the opposing roller 218. Discharged in the direction.
[0021]
[Problems to be solved by the invention]
The conventional image reading apparatus 200 uses the feeding roller 215 and the opposing roller 216 while the document 211 is sandwiched between the document separation roller 212 and the preliminary conveyance plate 213 and a load (back tension) is applied by the friction piece 214. This is a sheet feed type reading apparatus that conveys the original 211 and reads the original 211.
[0022]
Then, the outer diameter of the feed roller 215 for main transporting the document 211 determines the transport amount of the document.
[0023]
Here, the material of the cylindrical surface of the feed roller 215 is rubber, and the outer diameter of the feed roller 215 during mass production causes a molding variation of about 1% in diameter.
[0024]
For this reason, even for the feed rollers to which the same model is given, a variation in the outer diameter of the roller causes a conveyance amount error of slightly less than ± 1% with respect to the regular conveyance amount. Due to the quantity error, an error in reading resolution in the document transport direction (sub-scanning direction) occurs.
[0025]
Then, when an image in which an error in reading resolution occurs as described above is converted into a resolution of millimeter units and output, there is a problem that an image stretched in the sub-scanning direction is output.
[0026]
For example, when the outer shape of the feeding roller 215 is 1% larger than the normal value, if the roller diameter is a normal value, a document to be read at a resolution of 200 dpi in the sub-scanning direction is read at a resolution of about 198 dpi. Become.
[0027]
Then, when the image read at the resolution of about 198 dpi is converted to the resolution of the standard mode of the millimeter unit system, it should be converted into an image of 97.8 dpi in the sub-scanning direction, and is about 96.8 dpi. It is converted to a resolution image and output.
[0028]
When reading the document, if the dimensional accuracy of the outer diameter of the feeding roller 215 is strictly controlled in order to reduce the resolution error, the manufacturing cost of the feeding roller 215 increases.
[0029]
Note that the above problem also arises in an image processing apparatus that reads an image with a resolution in millimeter units, converts it to an inch resolution, and outputs it.
[0030]
The above problem also occurs in a copying machine or the like which is an image processing apparatus other than a facsimile apparatus.
[0031]
Further, the above problem also occurs in an image processing apparatus that fixes a document and moves a sensor for reading an image in the sub-scanning direction to read the document. The reason why this problem occurs is that the amount of movement of the contact sensor varies due to variations in the dimensional accuracy of the parts constituting the mechanism that moves the contact sensor.
[0032]
That is, in the above-described conventional example, when an image recorded on a document is read, and the resolution of the read image is converted and output, if the accuracy of the components moving the document or the reading sensor is poor, the sub-scanning direction There is a problem in that a stretched image is output.
[0033]
The present invention provides an image processing apparatus that reads an image recorded on a document, converts the resolution of the read image, and outputs the image, without improving the accuracy of a mechanism component that moves the document or the reading sensor. An object is to provide an image processing apparatus and an image processing method capable of outputting an image with less expansion and contraction in the sub-scanning direction.
[0034]
[Means for Solving the Problems]
  The present invention provides an image reading unit that conveys a document on which a two-dimensional image is recorded in the sub-scanning direction and reads the document using a first resolution unit system, and a document that detects the presence or absence of the document on the document conveyance path. A detection unit; a conveyance speed detection unit configured to detect an error in a conveyance speed of the document generated by a size of a roller that conveys the document based on a time during which the document passes through the document detection unit; and the conveyance speed detection unit Used when converting the resolution in the sub-scanning direction of the image read by the image reading unit to a second resolution unit system different from the first resolution unit system based on the conveyance speed error detected by A conversion value setting means for setting a conversion value to be used, and the second resolution using the conversion value set by the conversion value setting means after the original is detected by the original detection means. And resolution converting means for converting the resolution of the position based on the image reading means read the image, an image processing apparatus characterized by having an image output means for outputting the image in which the resolution converting means has converted.
[0035]
BEST MODE FOR CARRYING OUT THE INVENTION
[First embodiment]
FIG. 1 is a cross-sectional view showing a configuration of an image reading apparatus 100 according to the first embodiment of the present invention.
[0036]
The image reading apparatus 100 includes a main body chassis 1, a control board 2 that controls the image reading apparatus 100, a power supply unit 3, an operation panel 4, a control board 5 of the operation panel 4, and a document table on which documents 6 are stacked. 7.
[0037]
The power supply unit 3 is a unit that supplies power to the image reading apparatus 100, and the operation panel 4 is a panel that is used when the operator operates the image reading apparatus 100.
[0038]
In addition, the image reading apparatus 100 includes a document auxiliary table 8, a width regulating plate 9, a separation roller 10, a drive motor (not shown) that drives the separation roller 10, a preliminary conveyance plate 11, and a friction piece 12. It comprises.
[0039]
The document auxiliary table 8 is a table on which the document 6 is stacked, and the width restriction plate 9 is a restriction plate that restricts the conveyed document 6 from moving in the width direction when the document 6 is conveyed. Further, the document 6 is moved to a wedge-shaped place where the separation roller 10 rotating in the direction of the arrow AR1 and the preliminary conveying plate 11 biased to the separation roller 10 are formed by the separation roller 10 and the friction piece 12. Transport. The friction piece 6 separates the conveyed plurality of documents 6 one by one.
[0040]
The image reading apparatus 100 also includes a feeding (conveying) roller 13a, a drive motor (not shown) that drives the feeding roller 13a, an auxiliary roller 13b, a document conveying guide 14, a contact sensor 15, and a reading sensor. A reference plate 16, a paper discharge roller 17a, a drive motor (not shown) for driving the paper discharge roller 17a, and an auxiliary roller 17b are provided.
[0041]
A feeding roller 13a that rotates in the direction of the arrow AR2 and an auxiliary roller 13b that faces the feeding roller 13a and is urged by the feeding roller 13a carry the document 6 therebetween. The document transport guide 14 guides the document 6 transported from the separation roller 10 to the contact sensor 15.
[0042]
An LED (not shown) that is a light source for illuminating the document 6 is provided inside the contact sensor 15, and the document 6 to which the contact sensor 15 is conveyed can be used with a resolution of millimeter units using this light source. read. The reading reference plate 16 is provided above the contact sensor 15 (opposed position), and is painted in white as the background color of the document 6. The reading reference plate 16 has a width that covers the entire reading width of the contact sensor 15.
[0043]
The direction of the arrow AR4, which is the outward direction of the image processing apparatus 100, is a paper discharge roller 17a that rotates in the direction of the arrow AR3, and an auxiliary roller 17b that faces the paper discharge roller 17a and is urged by the paper discharge roller 17a. The document 6 is discharged.
[0044]
The reading apparatus 100 also has a dip switch (not shown) that sets a conversion value used when converting the resolution of the read image. The dip switch reads a conversion value used when converting the resolution in the sub-scanning direction in the read two-dimensional image in the millimeter unit system into the resolution in the inch unit system, and reads the read image in the sub-scanning direction. This is a dip switch that is set according to the resolution error.
[0045]
A resolution conversion processing unit (not shown) provided on the control board 2 is a processing unit that converts the resolution of the read image.
[0046]
That is, the resolution conversion processing unit uses the conversion value set via the DIP switch to determine the resolution in the sub-scanning direction of the two-dimensional image read by the contact sensor 15 using the inch resolution unit. , Convert to millimeter resolution image.
[0047]
Then, the converted image is output via an image output unit (not shown) provided in the image reading apparatus 100.
[0048]
Next, the operation of the image reading apparatus 100 will be described.
[0049]
In the image reading apparatus 100, the feeding roller 13 a transports the document 6, and the contact sensor 15 reads an image recorded (appears) on the document 6.
[0050]
The image reading apparatus 100 reads an image with an inch unit system resolution in the main scanning direction of 300 dpi and the sub-scanning direction of 300 dpi.
[0051]
In the image reading apparatus 100, the normal value of the outer diameter of the feeding roller 13a that performs the main conveyance of the document 6 is set to 16 mm. The outer diameter tolerance of the roller is “± 0.05 mm”, which is a tolerance for mass production. Note that the conveyance amount of the original 6 when the original 6 is read is determined by the outer diameter of the feeding roller 13a and the like.
[0052]
Due to the outer diameter tolerance of the feeding roller 13a, a conveyance amount error of about ± 0.3% (± 0.05 mm / 16 mm) with respect to the normal conveyance amount of the document 6 occurs. Due to the generated transport amount error, an error in reading resolution occurs in the sub-scanning direction, and the read image expands and contracts in the sub-scanning direction. When this expansion / contraction is converted into a standard size A4 size, the expansion / contraction is “± 1 mm” (= 297 × 0.3%).
[0053]
Then, an image having an inch unit system resolution, and the above-described stretched image is converted into a millimeter unit system using a regular conversion value (a conversion value used when the outer diameter of the feeding roller 13a is 16 mm). When converted into an image and output, an image expanded and contracted in the sub-scanning direction is output.
[0054]
Therefore, when converting an image having an inch-unit resolution into an image having a millimeter-unit resolution, conversion is performed using a conversion value different from the regular conversion value, and the converted image is output.
[0055]
Next, the resolution conversion will be specifically described.
[0056]
Here, the resolution conversion performed to transmit an image read at a resolution of 300 × 300 dpi, which is an inch unit system, in the standard mode (Std: 3.85 Line / mm × 8 Pel) of the millimeter unit system G3 facsimile apparatus will be described. To do.
[0057]
In the conventional example, the resolution in the main scanning direction of the image read in the inch unit system is converted from 300 dpi to 203.1 dpi (25.4 / 0.125), and the resolution in the sub-scanning direction is changed from 300 dpi to 97.8 dpi ( 25.4 / (1 / 3.85)) for transmission.
[0058]
Here, if the outer diameter of the feeding roller 13a provided in the image reading apparatus 100 is 16.05 mm, which is 0.3% larger than the regular value of 16 mm, it should be read with a resolution of 300 × 300 dpi. An image is actually read at a resolution of 300 (main scanning direction) dpi × 291.3 (sub-scanning direction) dpi, and when the resolution conversion is performed on the read image, 203.1 dpi × An image to be converted to a resolution of 97.8 dpi is converted to a resolution of 203.1 dpi (main scanning direction) × 95.0 (sub-scanning direction) dpi and transmitted.
[0059]
That is, an image reduced by 0.3% (about 1 mm for the A4 size) with respect to the dimension of the document 6 in the sub-scanning direction is transmitted.
[0060]
Therefore, when the resolution conversion is performed, the conversion is performed using a conversion value different from the regular conversion value.
[0061]
That is, when the outer diameter of the feeding roller 13a is a regular value of 16 mm, the read resolution of 300 dpi in the sub-scanning direction is multiplied by the regular resolution conversion value of 0.326 to obtain an image with a resolution of 97.8 dpi. However, when the outer diameter of the feed roller 13a is 16.05 mm, the read resolution 291.3 dpi in the sub-scanning direction is multiplied by a resolution conversion value 0.336 different from the normal resolution conversion value. And an image with a resolution of 97.8 dpi.
[0062]
Here, the resolution conversion value 0.336 is a normal resolution conversion value 0.326 used when the outer diameter of the feeding roller 13a is a normal value, and a correction coefficient of 1.03 (16.05 mm / 16 mm). ).
[0063]
Further, when the outer diameter of the feeding roller 13a provided in the image reading apparatus 100 is 15.95 mm which is 0.3% smaller than the regular value of 16 mm, the regular value is 16 mm. On the other hand, the same can be considered when there is a deviation other than 0.3%. Further, although the outer diameter of the feeding roller is 16 mm, it can be considered in the same manner even if the outer diameter is other than 16 mm.
[0064]
Further, the above-described resolution conversion and correction can be considered in the same way when an image is transmitted by facsimile in the fine mode and the super fine mode.
[0065]
According to the image reading apparatus 100, a conversion value used when a two-dimensional image is read using a resolution in millimeter units and the resolution in the sub-scanning direction of the read image is converted into a resolution in inches. The image is set according to the reading resolution error in the sub-scanning direction of the read image, the image is converted to the resolution of the inch unit system using the set conversion value, and the converted image is output. Therefore, an image with less expansion and contraction in the sub-scanning direction can be output without improving the accuracy of the outer diameter of the feeding roller 13a that conveys the document 6.
[0066]
In addition, instead of setting a conversion value according to the resolution error via the dip switch, a resolution error detection unit that detects a resolution error in the sub-scanning direction that occurs when the contact sensor 15 reads an image is provided as an image reading device. The conversion value may be set according to the resolution error detected by the resolution error detecting means provided in 100.
[0067]
Here, as the resolution error detecting means, a sensor for detecting the presence or absence of the document 6 is provided in the transport path of the document 6, and an error in the transport speed of the document 6 is obtained by obtaining a time for the document 6 to pass over the sensor. Therefore, it is possible to employ means for detecting a resolution error that occurs when the original is read from the error in the conveyance speed.
[0068]
[Second Embodiment]
When the image reading apparatus 100 according to the first embodiment is provided with a facsimile transmission / reception unit and a recording unit and performs facsimile transmission or the like, the composite apparatus 100a according to the second embodiment transmits the read image data after converting the resolution. It is a device to do.
[0069]
FIG. 2 is a cross-sectional view showing a configuration of a composite apparatus 100a according to the second embodiment of the present invention.
[0070]
FIG. 3 is a perspective view showing the external appearance of the composite apparatus 100a.
[0071]
FIG. 4 is a cross-sectional view illustrating a state in which the document table 104, the operation unit cover 116, and the like are moved in the multifunction apparatus 100a.
[0072]
The composite apparatus 100a includes a paper feed system A that supplies a recording sheet, a recording system B that records an image on the supplied recording sheet, a reading system C that reads an image recorded on a document, and an operator who uses the composite apparatus. And an operation unit D used when operating 100a.
[0073]
The composite apparatus 100a includes a main body upper cover 101, a main body lower cover 102, a control unit 102a that controls the composite apparatus 100a, and a power supply unit 102b that supplies power to the composite apparatus 100a.
[0074]
The recording sheet may be plain paper, a plastic sheet, or other material that can transfer ink. Further, in the composite apparatus 100a, plain paper cut to B4 size or A4 size is used as a recording sheet.
[0075]
Next, the paper feed system A will be described.
[0076]
The paper feeding system A is a system that supplies the recording system B with a recording sheet that is used when the recording system B records an image.
[0077]
A plurality of recording sheets 120 are stacked by a recording sheet tray 121 and a recording sheet auxiliary tray 122 that can be pulled out in the direction of the arrow AR9. The number of stacked recording sheets is limited by a recording sheet height regulating plate 101 a provided on the back surface of the main body upper cover 101.
[0078]
Further, the recording sheet side guide 123 prevents the recording sheet 120 from shifting in the width direction. A pressure plate 124 provided at the bottom of the recording sheet 120 can rotate about a rotation shaft (not shown). The recording sheet 120 comes into contact with the sheet feeding roller 125 when the pressure plate spring 124 a biases the pressure plate 124.
[0079]
The sheet feeding roller 125 is rotated in the direction of the arrow AR10 to convey the recording sheet 120. The conveyed recording sheet 120 is separated by nail separation (not shown) and one sheet at a time to the recording system B. Be transported.
[0080]
Next, the recording system B will be described.
[0081]
The composite apparatus 100a employs an ink jet recording system as the recording system B.
[0082]
The recording system B is a system that records an image received from another machine or an image received from the reading system C on a recording sheet 120 supplied by the paper feeding system A.
[0083]
The LF roller 127 and the pinch roller 126a provided on the recording sheet presser 126 and facing the LF roller 127 sandwich the recording sheet, and guide and convey the recording sheet conveyed from the paper feeding system A. The pinch roller 126a is urged by the LF roller 127.
[0084]
Then, when the recording sheet 120 passes between the recording cartridge 128 and the platen plate 129, the recording cartridge 128 records.
[0085]
In the recording system B, the recording cartridge 128 performs serial printing while moving in the width direction of the recording sheet 120 by a drive system (not shown) constituted by a motor or the like.
[0086]
Then, the paper discharge roller 130a and the spur roller 130b facing the paper discharge roller 130a are connected to the recording sheet 120 printed and recorded by the arrow AR11 so as not to soil the print surface of the printed recording sheet 120. Then, the conveyed recording sheets are stacked on the discharge cover 131 and the discharge auxiliary tray 132. The discharge auxiliary tray 132 can be moved in the direction of an arrow AR13 shown in FIG.
[0087]
As shown in FIG. 4, the document stacking table 104 can rotate in the direction of an arrow AR15 about a rotation shaft (not shown) provided on the main body upper cover 101. The recording cartridge 128 can be easily attached and detached by the operator in the direction of the arrow AR16.
[0088]
Next, the configuration of the reading system C will be described.
[0089]
The reading system C irradiates the original 103 with light, converts the reflected light into an electrical signal, and transmits the converted electrical signal to another apparatus or the recording system B according to the operation mode. It is a system.
[0090]
The reading system C includes a document table 104, a document auxiliary tray 105, width regulating plates 106a and 106b, a separation roller 107, a drive motor (not shown) for driving the separation roller 107, a preliminary conveyance plate 108, The system includes the friction piece 109.
[0091]
Here, the document auxiliary tray 105 is a tray on which the document 103 is stacked, and the width regulating plates 106a and 106b are skewed by moving the conveyed document 103 in the width direction when the document 103 is conveyed. It is a regulation plate that regulates this. In addition, the separation roller 107 that rotates in the direction of the arrow AR5 and the preliminary conveyance plate 108 that is biased to the separation roller 107 reach the wedge-shaped place formed by the separation roller 107 and the friction piece 109. Is supposed to be transported. The friction piece 109 separates the conveyed plurality of documents 103 one by one.
[0092]
The reading system C includes a feeding roller 110a, a driving motor (not shown) that drives the feeding roller 110a, an auxiliary roller 110b, a document conveyance guide 111, a contact sensor 112, and a reading reference plate 113. , A discharge roller 114a, a drive motor (not shown) for driving the discharge roller 114a, and an auxiliary roller 114b.
[0093]
Here, the feeding roller 110a rotating in the direction of the arrow AR6 and the auxiliary roller 110b facing the feeding roller 1310a and urging the feeding roller 110a sandwich the document 103 and convey it. The document conveyance guide 111 guides the document 103 conveyed from the separation roller 107 to the contact sensor 112.
[0094]
The contact sensor 112 is provided with an LED, which is a light source for illuminating the original 103, and the contact sensor 112 reads the original conveyed using the light source. The reading reference plate 113 is provided on the contact sensor 112 and painted in white as the background color of the original 103. The width of the reading reference plate 113 is a width that covers the entire reading width of the contact sensor 112.
[0095]
Further, the paper discharge roller 114a rotating in the direction of the arrow AR7 and the auxiliary roller 114b facing the paper discharge roller 114a and urging the paper discharge roller 114a are in the direction of the arrow AR8, which is the outward direction of the multifunction apparatus 100a. Then, the document 103 is discharged.
[0096]
Then, the discharged document 103 is stacked on the document discharge tray 115. The document discharge tray 115 is movable in the direction of the arrow AR12 shown in FIG. 3, and can be stored in the multifunction apparatus 100a when the multifunction apparatus 100a performs an operation other than the document reading operation. It has become.
[0097]
Next, the operation unit D will be described.
[0098]
The operation unit D is an operation unit used when an operator performs operations such as a copy operation, a transmission operation, and a scanner operation.
[0099]
The operation unit cover 116 of the operation unit D includes keys that are pressed down according to various operations such as a dial key 116a, and a display unit 116b. The operation unit D is provided in the upper part of the document conveyance mechanism of the reading system C, and is rotated in the direction of an arrow AR14 shown in FIG. 4, and the rotation of the operation unit D allows the operator to perform maintenance and inspection of the document conveyance mechanism. it can. At one end of the operation unit D, a telephone line modular m1 used for transmission and reception is provided.
[0100]
Next, the control system of the composite apparatus 100a will be described.
[0101]
FIG. 5 is a block diagram showing the configuration of the control system of the composite apparatus 100a.
[0102]
The composite apparatus 100a includes a control unit 102a that controls the composite apparatus 100a, a power supply unit 102b that supplies power to the entire composite apparatus 100a, a modem board unit 2a, a communication board unit 102c that connects a telephone, and an operation unit D. And a display unit 116b for displaying input contents and the like.
[0103]
The control unit 102a includes a CPU 2b that controls the entire composite device 100a, a ROM 2c that stores various programs and various data, a RAM 2d, a line memory 2e, an encoding / combining unit 2f, and a memory buffer 2g. And an input / output switching interface 2h. The RAM 2d is a memory that is used as a work area of the CPU 2b, temporarily stores various data such as the number of recorded sheets, and stores and registers various data.
[0104]
The line memory 2e is a line memory for storing an image of each line of the image. When transmitting a document or copying a document, the line memory 2e stores image data for one line sent from the document reading system C. When the received document is recorded, data for one line of the received and decoded image is stored.
[0105]
Then, the CPU 2b adds the recording system control code to the image stored in the line memory 2e, and outputs the image with the recording system control code added to the CPU B1 of the recording system B through the input / output switching interface 2h. The CPU B1 decodes the recording system control code and records an image.
[0106]
The encoding / decoding unit 2f encodes image information to be transmitted using the MH encoding method or the like, and decodes the received encoded image data to convert it into image data. The memory buffer 2g is a buffer memory that stores encoded image data when transmitting and receiving.
[0107]
In addition, image data and text data can be input from the computer E to the recording system B via the printer interface 2i. Further, the image data read by the reading system C can be sent to the computer E.
[0108]
Next, the operation of the composite apparatus 100a will be described.
[0109]
Similar to the image reading apparatus 100, the composite apparatus 100 a reads an image recorded on the document 103 using the feeding roller 110 a, the contact sensor 112, and the like.
[0110]
Then, similarly to the image reading apparatus 100, the read image is converted using a conversion value different from the normal conversion value, and the converted image is output.
[0111]
Further, the composite apparatus 100a transmits the converted image to the destination facsimile apparatus via the modem 2a, the NCU 102c, and the like.
[0112]
Note that the recording system B may record the converted image instead of the facsimile transmission. Further, the converted image may be output to the peripheral computer E provided outside the composite apparatus 100a via the printer interface 2i.
[0113]
In the composite apparatus 100a, the nail separation method is used as a method for separating the recording sheets in the paper feeding system A. Instead of this method, other separation methods such as a friction separation method and a retard separation method are used. It may be adopted.
[0114]
According to the composite apparatus 100a, an image with less expansion and contraction in the sub-scanning direction can be transmitted and recorded without improving the accuracy of the outer diameter of the feeding roller 110a that conveys the document 103.
[0115]
[Third embodiment]
In the third embodiment, instead of the ink jet recording system employed in the second embodiment, an electrophotographic recording system (laser beam printer) using toner, or thermal transfer recording using an ink sheet and a thermal head is used. This is an embodiment employing a method and the like.
[0116]
Also in the third embodiment, an image with little expansion and contraction can be recorded in the sub-scanning direction.
[0117]
In each of the above embodiments, when reading an image, a document is conveyed using a feeding roller. However, the image may be read by fixing the document and moving a contact sensor.
[0118]
In each of the above embodiments, an image is read using a contact sensor. Alternatively, the image may be read by a reduction optical system using a light source and a CCD.
[0119]
In each of the above embodiments, an image is read by an inch-unit scanner, and the read image is converted into a millimeter-unit system. However, an image is read by a millimeter-unit scanner, and the read image is converted into an inch unit. It may be converted to a system.
[0120]
The image reading device 100 and the composite device 100a are examples of image processing devices.
[0121]
【The invention's effect】
  According to the present invention,Since the resolution conversion error caused by the size of the roller that transports the document is corrected at the output timing of the image obtained by reading the document, no specific operation is required to set the resolution conversion value.There is an effect.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a configuration of an image reading apparatus 100 according to a first embodiment of the present invention.
FIG. 2 is a cross-sectional view showing a configuration of a composite apparatus 100a according to a second embodiment of the present invention.
FIG. 3 is a perspective view showing an appearance of the composite apparatus 100a.
4 is a cross-sectional view illustrating a state in which a document table 104, an operation unit cover 106, and the like are moved in the multifunction apparatus 100a. FIG.
FIG. 5 is a block diagram illustrating a configuration of a control system of the composite apparatus 100a.
6 is a diagram showing a configuration of a conventional image reading apparatus 200. FIG.
[Explanation of symbols]
100: Image reading apparatus
100a ... Composite device,
13a, 110a ... feed roller,
15, 112 ... contact sensor,
2 ... Control board,
102a: Control unit.

Claims (6)

Image reading means for conveying a document on which a two-dimensional image is recorded in the sub-scanning direction and reading the document using the first resolution unit system;
Document detection means for detecting the presence or absence of the document on the document transport path;
A transport speed detecting means for detecting an error in the transport speed of the document generated by a dimension of a roller for transporting the document based on a time during which the document passes through the document detecting means ;
Based on the error in the conveyance speed detected by the conveyance speed detection unit, the resolution in the sub-scanning direction of the image read by the image reading unit is changed to a second resolution unit system different from the first resolution unit system. Conversion value setting means for setting a conversion value to be used when converting;
A resolution conversion means for converting the resolution of the image read by the image reading means into the second resolution unit system using the conversion value set by the conversion value setting means after the original is detected by the original detection means; ;
Image output means for outputting the image converted by the resolution conversion means;
An image processing apparatus comprising: In claim 1,
The image processing apparatus, wherein the image output means is means for transmitting the image to an image processing apparatus other than the image processing apparatus via a communication line. In claim 1,
The image processing apparatus, wherein the image output means is means for recording the image. In claim 1,
The image processing apparatus, wherein the first resolution unit system is an inch unit system, and the second resolution unit system is a millimeter unit system used in a G3 facsimile transmission mode. In claim 1,
The image processing apparatus, wherein the first resolution unit system is a millimeter unit system, and the second resolution unit system is an inch unit system. An image reading stage in which a document on which a two-dimensional image is recorded is conveyed in the sub-scanning direction and is read using the first resolution unit system;
A document detection stage for detecting the presence or absence of the document on the document transport path;
A transport speed detection stage for detecting an error in the transport speed of the original document based on a time period for detecting the original document in the original detection stage ;
Based on the error in the conveyance speed detected by the conveyance speed detection step , the resolution in the sub-scanning direction of the image read by the image reading unit is changed to a second resolution unit system different from the first resolution unit system. A conversion value setting stage for setting a conversion value to be used for conversion;
A resolution conversion stage for converting the resolution of the image read in the image reading stage into the second resolution unit system by using the conversion value set in the conversion value setting stage for the image read by the image reading means; ;
An image output stage for outputting the image converted in the resolution conversion stage ;
An image processing method comprising:

Images