JP2006128794A - Copying machine and control method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make it possible to output a print result optimum to a recording medium by executing read control, image processing and print control in response to a kind of the recording medium set to a paper feed section in the case of executing copying. <P>SOLUTION: The copying machine is constituted so that a paper kind detection means 107 detects a kind of the recording medium set to the paper feed section 108 and the copying machine revises read resolution and print resolution depending on the detected kind of paper to carry out printing. For example, the copying machine reads and records with a high resolution an image and applies image processing as a photo image in the case of coat paper and slick paper. On the other hand, the copying machine reads and records an image with a low resolution and applies image processing as an image including characters and a picture in the case of ordinary paper and OHP paper. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a copying apparatus having, for example, a scanner function, a printer function, and the like, and in particular, a copy function, and a control method thereof.

  FIG. 5 shows the configuration of a conventional copying apparatus (hereinafter referred to as an image processing apparatus). In a conventional image processing apparatus 601 having a scanner function, a printer function, a copy function, and the like, the scanner function or the printer function is connected to the host computer 602 and used. For example, in the scanner function, digital data of a document read by the scanner unit 603 in the image processing apparatus 601 can be transferred to the host computer 602 through the interface unit 106. In the printer function, data created in the host computer 602 can be transferred to the recording unit 606 in the image processing apparatus 601 through the interface unit 607 to be printed out. In this way, the original image can be duplicated via the host computer 602.

  On the other hand, when the copy function of the image processing apparatus is used, the copy function can be used stand-alone regardless of the host computer 602. As a specific operation flow, for example, a document to be copied is read by the scanner unit 603 in the image processing apparatus 601. Image data output from the scanner unit 603 is input to an image processing unit 604, where image processing such as input mask processing, filter processing, scaling processing, log conversion processing, masking processing, gamma processing, and multi-value processing is performed. Then, it is held in the data buffer 605 as multi-value data. The stored multi-value data is converted into recording data by the recording unit 606 and printed on a recording medium.

  There is also an image processing apparatus that can set a mode according to an image to be copied. In some cases, it may be better to change the image processing method depending on the type of image (photo, text, photo and text, graphics, etc.), and the optimum processing method can be selected based on the balance between image quality and processing speed. This is because. In addition, when the recording unit 606 is configured by an ink jet method and uses dye-based ink, the image quality changes depending on the degree of ink penetration into the printing paper (penetration speed, contact angle, etc.). It is preferable to perform resolution and image processing suitable for each type of medium having different ink penetration conditions, such as paper and plain paper.

Therefore, for example, there are settings such as a copy mode for copying a text image and a photo mode for copying a photographic image, and the data in the scanner unit 603, the image processing unit 604, and the recording unit 606 depending on each setting. There is a copying apparatus in which processing is changed to perform printing on a recording medium (see Patent Document 1).
Japanese Patent Laid-Open No. 2000-244697

  However, when using the copy function of the image processing device, the type of recording media set by the user in the paper feed unit matches the copy mode settings such as the text image mode and the photo image mode. If the result is good, there is no problem, but if a copy mode that does not match the type of recording medium is set, the print result may be unsatisfactory. For example, when copying is performed with the text image mode set as the copy mode, the scanner unit performs reading operation with low resolution, and the recording unit also performs image forming operation with low resolution. In this case, if the recording medium is a recording medium for high resolution such as glossy paper, the printed result is a thin image. On the other hand, for example, when copying is performed with the photographic image mode set as the copy mode, the scanner unit performs reading operation with high resolution, and the recording unit also performs image forming operation with high resolution. In this case, if the recording medium is a recording medium for low resolution such as plain paper, even if recording is performed at a high resolution, the resolution is not reflected in the print result, and a high-quality image is not necessarily obtained.

  As described above, when there are only two types of copy modes that can be selected by the user, for example, the text image mode and the photographic image mode, image processing according to each copy mode is possible, but plain paper, coated paper, glossy Control in the optimum copy mode is not always performed for a plurality of types of recording media such as paper. Therefore, depending on the combination of the mode and the type of recording medium, there is a problem in that an image having a lower quality than the image quality that should originally be obtained may be output.

  The present invention has been made in view of the above problems, and by performing reading control, image processing, and printing control according to the type of recording medium used for printing, it is possible to output a high-quality image. An object of the present invention is to provide a copying apparatus and a control method thereof.

  In order to achieve the above object, the Japanese invention has the following configuration. A copying apparatus for copying a document image, a reading unit that optically reads a document and outputs it as image data, an image processing unit that performs image processing on the image data and outputs multilevel data, and A recording unit that converts multi-value data into recording data to form an image on a recording medium, a detecting unit that detects the type of recording medium on which the recording unit forms an image, and a reading unit that reads a document The reading resolution and the recording resolution at which the recording unit forms an image on the recording medium are set to resolutions according to the type of the recording medium detected by the detecting unit, and the recording medium is used as image processing by the image processing unit. And a control means for performing image processing according to the type.

  According to the present invention, it is possible to output a high-quality image by performing reading control, image processing, and printing control according to the type of recording medium used for printing.

  In particular, when the recording medium is suitable for forming a high-resolution image such as glossy paper or coated paper, the reading resolution and the recording resolution are set to a high resolution, and processing suitable for a photographic image is performed as the image processing. Is suitable for forming low-resolution images, such as plain paper and OHP paper, the reading resolution and recording resolution should be set to low resolution, and processing suitable for images with mixed text and photographs as image processing Thus, the quality of the image formed on the recording medium can be improved.

[First Embodiment]
The copier (image processing apparatus) according to the first embodiment of the present invention will be described below.

  In this specification, “recording” (sometimes referred to as “printing” or “printing”) is not only for forming significant information such as characters and figures, but also for human beings regardless of significance. Regardless of whether or not it has been revealed so that it can be perceived, a case where an image, a pattern, a pattern, or the like is widely formed on a recording medium or a medium is processed is also expressed.

  “Recording media” (sometimes referred to as “recording media” or “media”) includes not only paper used in general recording apparatuses but also a wide range of fabrics, plastic films, metal plates, glass, ceramics. , Wood, leather, etc., which can accept ink.

  FIG. 1 is a block diagram showing a configuration of a control system of an image processing apparatus related to an embodiment of the present invention. In this block diagram, reference numeral 101 denotes an image processing apparatus. Reference numeral 103 denotes a scanner unit (also referred to as a reading unit), in which an original is read line by line with a photoelectric sensor such as a contact sensor (CS) or CCD, and color separation is performed to obtain RGB analog image signals. Yes. Furthermore, the analog image signal is converted into a digital image signal. This digital image data is hereinafter simply referred to as image data.

  An image processing unit 104 is an input masking process 1041, a filter process 1042, a scaling process 1043, a log conversion process 1044, a masking process 1045, a gamma correction process 1046, and a multi-value for the image data output from the scanner unit 103. Image processing is performed in the order of conversion processing 1047. In the input masking process 1041, the spectral characteristics of a photoelectric conversion element such as a CCD and the spectral characteristics of a light source and a reflector are corrected. In the filter process 1042, the filter process is performed using a filter prepared for each process such as edge enhancement and smoothing. In the scaling process 1043, the size of the image is enlarged or reduced. In the log conversion processing 1044, color system conversion such as RGB color system to YMC color system is performed. In the masking process 1045, the signal is corrected according to the output of the printer. In addition, an under color removal process is also performed. In the gamma correction processing 1046, the pixel value and the output density are corrected to be linear. In the multivalue processing 1047, the image data is quantized.

  Reference numeral 105 denotes a data buffer. Multi-value data obtained after multi-value processing is temporarily stored in the buffer 105. A recording unit 106 receives multi-valued data held in the data buffer 105 for each line, converts it into a data format that can be printed, that is, print data, and records the data on a recording medium. I have to.

  Reference numeral 108 denotes a paper feeding unit for setting and holding the recording medium. The paper feeding unit 108 conveys the recording medium to the printing position of the recording unit according to a paper feeding command from the recording unit 106. Reference numeral 107 denotes a paper type detection unit for detecting the type of recording medium held in the paper supply unit 108. The paper type detection unit 107 includes, for example, a first optical sensor for measuring the reflectance of the media surface and a second optical sensor for measuring the optical transmittance of the media. In this case, the first photosensor is configured such that light emitted from the light emitting diode is reflected on the media surface and reaches the phototransistor on the media surface side, and the second photosensor includes the light emitting diode and the phototransistor. It is comprised by the photo interrupter which can arrange | position a medium between. For example, the sensor output value when the intensity of light detected by each phototransistor exceeds a predetermined threshold is set to 1. In that case, when the output value of the first photosensor is 1 and the output value of the second photosensor is 0, the reflected light is detected and the transmitted light is not detected. Judged as paper or coated paper. When the output value of the first photosensor is 0 and the output value of the second photosensor is 0, neither reflected light nor transmitted light is detected, so that the recording medium can be determined as plain paper. When the output value of the second photosensor is 1, since transmitted light is detected, the recording medium can be determined to be OHP paper regardless of the output value of the first photosensor. In this way, the paper type can be determined.

  In addition to the method of directly identifying the type of the recording medium using the optical sensor as described above, it can also be detected indirectly. As a method of indirectly identifying the type of recording medium, for example, a cassette method is used for the paper feed unit, and the recording apparatus is provided with a plurality of cassettes, and a barcode or a convex portion indicating the type of media stored in each cassette. The identification part is provided. In the case of a bar code, there is a method of detecting the position of the convex portion by an optical sensor or a mechanical sensor if it is a convex portion. The type of media can also be determined based on the identification unit represented on the cassette by using a micro switch or the like of the copying apparatus main body. In addition, various types of sensors can be used to identify the type of media.

  An operation unit 109 is used for an operator to input a copy mode and to display a set copy mode. The operation unit 109 allows the operator to set a photo image mode, a text image mode, a DTP image mode, an auto mode, and the like as a copy mode. Each unit described above is controlled by the control unit 102. The control unit 102 includes a CPU, a memory, an input / output interface, and the like. Then, the program loaded in the memory by the CPU can be executed, and the reading resolution by the scanner unit 103 and the recording resolution by the recording unit 106 can be changed to read an image or form an image. In addition, regarding the image processing by the image processing unit 104, the filter used in the filter processing 1042 can be changed, and the scaling processing 1043 can perform scaling in the vertical and horizontal directions. In addition, the control unit 102 is provided with a media type storage unit 102a that stores the media type detected by the paper type detection unit 107, and a mode storage unit 102b that stores the copy mode set by the operator. ing. The mode storage unit 102b is not used in the first embodiment, and is used only in the second embodiment. In this way, the control unit 102 controls the entire image processing apparatus 101.

  FIG. 4 is a cross-sectional configuration diagram of the image processing apparatus (copying apparatus) of the present embodiment. The image processing apparatus 101 includes a scanner unit and a printer unit. The scanner unit includes a platen glass 402, a document table cover 401, a light source unit 404, reflecting mirrors 405, 406 and 407, a condensing lens 408, and a photoelectric conversion element 409. The illumination unit 403 of the light source unit 404 irradiates the document placed on the platen glass 402 with light, and the reflected light is guided to the condensing lens 408 by the reflecting mirrors 405, 406, and 407, and provided on the focal plane. It is converted into an electric signal by the photoelectric conversion element 409 such as a CCD, and digitized and input to the image processing unit 102 as digital image data to read an image. At this time, the reading resolution in the scanning direction can be changed by changing the scanning speed of the light source unit 404 in the scanning direction (sub scanning direction). For example, when the normal scanning speed is V and the resolution at this time is low, the resolution at the scanning speed V / 2 is high. In this case, the low resolution is half of the high resolution. The low resolution can be about 300 DPI, and the high resolution can be about 600 DPI.

  The recording unit of the image processing apparatus 101 according to the present embodiment includes a recording head 6, a paper feeding unit 108, a paper type detection unit 107, and a paper discharge tray 410. The image data processed by the image processing unit 102 is converted into recording data, and is transferred to the transport position of the recording medium (printing paper) P and the scanning position of the recording head 6 (position in the direction perpendicular to the paper surface of FIG. 4). In response, the recording head 6 is provided so that a two-dimensional image is formed. In the recording head 6, ink is ejected to the recording medium P according to the given image data. Thereby, an image is formed on the paper. The recording head 6 typically includes YMCK four-color ink recording heads, and is provided with image data for each color component to form an image. The recording medium P is placed on the paper feeding unit 108 and is fed one by one from the surface into the printer unit by a paper feeding roller. The paper feed unit 8 is provided with an optical sensor constituting the paper type detection unit 107. The recording medium P on which the image has been formed is discharged onto the paper discharge tray 410. The image forming unit can also change the recording resolution at the time of image formation. For this purpose, for example, the recording head is conveyed at a normal speed to realize low resolution recording, and the normal resolution is achieved by conveying the recording head at half the normal speed. Of course, the pixel clock (recording head drive frequency) is not changed in this case. By using such a method, the recording resolution in the conveyance direction of the recording head can be changed. In order to change the recording resolution in the paper conveyance direction, an image is usually formed using all the nozzles (high resolution recording), whereas in low resolution recording, an image is formed using every other nozzle in the paper conveyance direction. . In this way, the recording resolution can be changed to either high resolution or low resolution. Of course, the resolution is selected by controlling the operation of the recording unit 106 by the control unit 102.

  In the present embodiment, the recording unit 106 is configured by an inkjet method. However, the present invention is not limited to the ink jet recording method, and any recording unit may be used as long as the quality of an image formed by performing recording control according to the type of recording medium is changed. Is also applicable. In addition, the ink jet method further drives a piezoelectric element or the like to apply pressure to the ink inside the recording head and ejects it from the nozzle, and the ink inside the recording head heats and evaporates and discharges from the nozzle by that pressure. There is a method to make it. Any of them can be applied to the present invention.

<Image forming operation>
Next, the operation of each control system when executing the copy function in the image processing apparatus according to the embodiment of the present invention will be described. FIG. 2 is a flowchart showing a series of operations of the control system in the image processing apparatus 101. FIG. 2 shows a procedure after the operator places a document on the scanner unit 103 of the image processing apparatus 101 and executes a copy start operation from the operation unit 109.

  First, the paper type detection unit 107 detects the type of recording medium in the paper supply unit 108, and stores the detected media type in the media type storage unit 102a (step S201). For example, one of four types of “plain paper”, “coated paper”, “glossy paper”, and “OHP paper” is detected. For this purpose, for example, as described above, the type of medium can be specified by a combination of detection output values of two optical sensors. The reading resolution in the scanner unit 103 is determined according to the detection result.

  In step S202, the paper type is determined. In the case of “coated paper” or “glossy paper”, the process branches to step S203. In step S203, the document image is read at high resolution, and high resolution image data is generated. If it is “plain paper” or “OHP paper”, the process branches to step S206. In step S206, the original image is read at a low resolution, and low resolution image data is generated. Here, the high-resolution reading operation realizes high-resolution reading by reducing the reading speed in the sub-scanning direction while maintaining the resolution in the main scanning direction as it is. Further, the low resolution reading operation realizes low resolution reading by increasing the reading speed in the sub-scanning direction.

  The scanner unit 103 starts reading a document at a resolution corresponding to the type of recording medium detected by the paper type detection unit 107 (that is, the value of the media type storage unit 102a), and transfers the image data created there to the image processing unit 204. To do. When image data is input to the image processing unit 204, image processing in the image processing unit 204 starts, and input masking processing, filter processing, scaling processing, log conversion processing, masking processing, gamma processing, multi-value processing Processing proceeds in this order. The multilevel data after the multilevel processing is held in the data buffer 205. Also in this image processing, data processing is executed so that an optimal print image corresponding to each recording medium can be obtained.

  If it is determined in step S202 that it is “coated paper” or “glossy paper”, in step S204, a photographic image is assumed as a processing target, and image processing suitable for it is executed. Image processing assuming a photographic image includes, for example, processing using a smoothing filter as filter processing, and deletion of isolated points. On the other hand, if “plain paper” or “OHP paper” is determined in step S202, a DTP image in which text and an image are mixed is assumed in step S207, and image processing suitable for the DTP image is performed. The process assuming a DTP image includes, for example, a process using an edge enhancement filter as a filter process.

  Next, when multi-value data for one line is prepared in the data buffer 105, transfer of the multi-value data for one line to the recording unit 106 is started. The recording unit 106 converts the sent multi-value data into print data, and starts printing when the amount of data necessary for printing is complete. The print control performed in the recording unit 106 is performed according to each recording medium. If it is determined in step S202 that the paper type is “coated paper” or “glossy paper”, high-resolution printing control is performed in step S205 to print a high-definition image. If it is determined in step S202 that the paper type is “plain paper” or “OHP paper,” low-resolution printing control is performed with emphasis on speed in step S208.

  Here, the reading resolution in the scanner unit 103 and the printing resolution in the recording unit 106 are controlled to be the same. That is, the reading resolution and the recording resolution are the same between the low resolution and the high resolution. For example, when the recording medium is “coated paper” or “glossy paper”, high resolution reading control, image processing, and printing control are performed, so that a printed image faithfully reproducing the original can be obtained.

  On the other hand, when the recording medium is “plain paper” or “OHP paper”, reading control, image processing, and printing control with low resolution are performed. For plain paper and OHP paper, even if high-definition recording is performed more than necessary, no improvement in image quality can be obtained. Therefore, excessive processing is not performed, thereby enabling quick output. In this way, by performing a series of data control corresponding to the paper type in the copying operation, a print result optimum for the paper type can be obtained.

  In the present embodiment, the reading resolution of the scanner unit and the recording resolution of the recording unit are two types of low resolution and high resolution, but the type of recording medium and the recording speed are selected from three or more resolutions. Accordingly, reading and recording at an appropriate resolution may be performed.

  In this embodiment, as a method of changing the recording resolution, a method of changing the scanning speed and recording is used. However, the scanning speed is constant, and a driving frequency that is an interval at which ink is ejected from each nozzle is set. A change method is also conceivable. Furthermore, when recording a predetermined recording area by a plurality of recording scans, a method for limiting the nozzles used for recording in the predetermined scanning, a method for changing the number of times the predetermined recording area is scanned, and a process after the recording scan are performed. A method of changing the transport amount of the recording medium is considered.

[Second Embodiment]
In the first embodiment, the copy mode is determined according to the detected paper type. In this embodiment, the image processing apparatus 101 can set “text image”, “photo image”, “DTP image”, and “auto” as copy modes. If any of the “text image”, “photo image”, or “DTP image” mode is set, the reading unit 103, depending on the setting, regardless of the result of the paper type detection unit 207, Data processing in the image processing unit 104 and the recording unit 106 is performed. When the “auto” mode is set, the document reading control by the reading unit 103, the data processing by the image processing unit 104, and the printing control by the recording unit 106 according to the type of recording medium detected in advance by the paper type detection unit 107. Are changed so that an optimum printing result can be obtained for the recording medium.

  The configuration of the apparatus according to the present embodiment is the same as that of the first embodiment as shown in FIGS. Then, the control procedure by the control unit 102 is executed as shown in FIG. 3 instead of the procedure shown in FIG. Here, steps S302 to S309 are the same processes as steps S201 to S208 in FIG. Therefore, the description is omitted. Steps S302 to S309 are executed when the copy mode (value of the mode storage unit 102b) is the “auto” mode in step S301.

  On the other hand, if it is determined in step S301 that the mode is not the auto mode, the copying operation is performed in steps S310 to S312 with the reading resolution, image processing, and recording resolution corresponding to each mode set by the user using the operation unit 109. The operation in each step may be determined individually according to, for example, any mode of “text image”, “photo image”, or “DTP image”, but steps S304 to S306 or steps S307 to S307. It can also be configured to perform any of S309. For example, if it is either “text image” or “DTP image” mode, the same processing as in steps S304 to S306 is executed as step S310 to step S312. If it is “photo image” mode, step S310 is executed. As Step S312, processing similar to Step S307 to Step S309 is executed.

  Of course, for example, in the “text image” mode, the edge enhancement is performed in the image processing, but in the “DTP image” mode, the edge enhancement is not performed in the image processing. You can also

  As described above, when the mode set by the operator is prioritized and the reading resolution, recording resolution, and image processing content are determined and determined according to the paper type (auto mode), The copying operation is performed with the optimum reading resolution, recording resolution, and image processing content according to the paper type. In this way, a copying operation that allows both improvement in image quality and speeding up of the processing while respecting the user's intention can be performed by the copying machine alone.

  Furthermore, when performing a copy operation, it is possible to output the optimum print result to the recording medium by performing reading control, image processing, and printing control according to the type of recording medium set in the paper feed unit. Become. For example, when printing on coated paper or glossy paper, a high-resolution reading, image processing, and high-resolution printing can represent a print image faithful to the original.

  Note that the present invention can be applied to a system including a plurality of devices (for example, a host computer, an interface device, a reader, and a printer), and a device (for example, a copying machine and a facsimile device) including a single device. You may apply to. Another object of the present invention is to supply a storage medium (or recording medium) in which a program code of software that realizes the functions of the above-described embodiments is recorded to a system or apparatus, and the computer (or CPU or CPU) of the system or apparatus. (MPU) can also be achieved by reading and executing the program code stored in the storage medium. In this case, the program code itself read from the storage medium realizes the functions of the above-described embodiments, and the program code itself and the storage medium storing the program code constitute the present invention.

  Further, by executing the program code read by the computer, not only the functions of the above-described embodiments are realized, but also an operating system (OS) running on the computer based on the instruction of the program code. A case where part or all of the actual processing is performed and the functions of the above-described embodiments are realized by the processing is also included. Furthermore, after the program code read from the storage medium is written into a memory provided in a function expansion card inserted into the computer or a function expansion unit connected to the computer, the function is determined based on the instruction of the program code. This includes a case where the CPU or the like provided in the expansion card or the function expansion unit performs part or all of the actual processing, and the functions of the above-described embodiments are realized by the processing.

1 is a block diagram of a copying apparatus (image processing apparatus) according to the present invention. It is a control flowchart of the image processing apparatus of 1st Embodiment of this invention. It is a control flowchart of the image processing apparatus of 2nd Embodiment of this invention. 1 is a cross-sectional view of a copying apparatus (image processing apparatus) according to the present invention. It is a block diagram of the image processing apparatus of a prior art example.

Explanation of symbols

101: Image processing apparatus 102: Control unit 103: Scanner unit 104: Image processing unit 105: Data buffer 106: Recording unit 107: Paper type detection unit 108: Paper feeding unit

Claims (9)

A copying apparatus for copying a document image, a reading means for optically reading the document and outputting it as image data;
Image processing means for performing image processing on the image data and outputting multilevel data;
Recording means for converting the multilevel data into recording data and forming an image on a recording medium;
Detecting means for detecting the type of recording medium on which an image is formed by the recording means;
The reading resolution for reading the document by the reading means and the recording resolution for forming an image on the recording medium by the recording means are set to resolutions corresponding to the type of the recording medium detected by the detecting means, and the image processing means And a control unit that performs image processing according to the type of the recording medium.   2. The copying apparatus according to claim 1, wherein the control unit performs reading of image data by the reading unit and image formation by the recording unit, with the reading resolution and the recording resolution being the same resolution.   The reading means can change the resolution in one arrangement direction of the two-dimensionally arranged image data, and the control means can change the image processing when the reading resolution is changed according to the type of the recording medium. The copying apparatus according to claim 1, wherein resolution conversion processing is performed by the means for the resolution in the other arrangement direction in accordance with the reading resolution.   Setting means for setting a copy mode is further provided. The setting means can set the auto mode as the copy mode, and when the auto mode is set as the copy mode, the control means uses the reading means. The reading resolution for reading the original and the recording resolution for forming an image on the recording medium by the recording means are set to resolutions according to the type of the recording medium detected by the paper type detecting means, and the image processing by the image processing means The copying apparatus according to claim 1, wherein image processing is performed according to a type of the recording medium.   As the reading resolution and the recording resolution, either a high resolution or a low resolution can be selected, and when the type of the recording medium is either coated paper or glossy paper, the control means can select the reading resolution. When the recording medium is neither coated paper nor glossy paper, the reading resolution and the recording resolution are selected as a low resolution, and the reading means and the recording means 4. The copying apparatus according to claim 1, wherein the image forming is performed by the method.   The control means further performs image processing for photographic images as the image processing when the type of the recording medium is either coated paper or glossy paper, and the type of the recording medium is coated paper or glossy paper. 6. The copying apparatus according to claim 5, wherein if it is neither of them, image processing for an image in which text and photographic images are mixed is performed as the image processing.   The setting means can further set a mode other than the auto mode, and when a mode other than the auto mode is set as the copy mode, the reading resolution for reading the document by the reading means, and the recording The recording resolution for forming an image on a recording medium is set to a resolution corresponding to a set copy mode, and image processing corresponding to the copy mode is performed as image processing in the image processing means. The copying apparatus according to claim 4.   The copying apparatus according to claim 1, wherein the recording unit forms an image on a recording medium by an ink jet method. A method of controlling a copying apparatus for copying a document image, wherein a reading process for optically reading a document and outputting it as image data;
An image processing step of performing image processing on the image data and outputting multilevel data;
A recording step of converting the multilevel data into recording data and forming an image on a recording medium,
The reading resolution for reading the original in the reading step and the recording resolution for forming an image on the recording medium in the recording step are set to resolutions according to the type of the recording medium detected by the detecting means, and the image processing means And a control unit that performs image processing according to the type of the recording medium.

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