JP4124219B2 - Image processing system - Google Patents

Description

  The present invention relates to an image processing system and an image processing method, and more particularly to correction of a scanned image.

2. Description of the Related Art Conventionally, a so-called flatbed type multi-function machine having an image reading function and a printing function capable of copying a compact disc (CD) label is known (for example, see Patent Documents 1 and 2).
However, the conventional multifunction peripheral has a problem that the shadow of the CD placed on the document table and illuminated from below the document table appears on the document mat, and the shadow is printed on the CD label as a printing medium. Further, in the conventional multifunction peripheral, generally, since the sampling pitch at the time of reading is slightly different between the main scanning direction and the sub-scanning direction, the hard copy image of the CD label is distorted with respect to the original CD label image. there were. Furthermore, due to this, a CD obtained by hard copy of a CD label has a problem that an unintended margin is formed on the CD label or ink is attached to an area other than the label area.

JP 2004-199489 A JP 2003-1873 A

  The present invention has been created in view of the above-described problems, and an object thereof is to provide an image processing system capable of correcting a scan image so that the shadow of a known scan object is reduced.

In order to achieve the above object, an image processing system according to the present invention includes a scan read from an object placed on a document table and covered with a document mat and illuminated from a direction that makes a specific angle with a perpendicular to the surface of the document table. An image acquisition means for acquiring an image, a means for specifying a rectangular first scan area circumscribing an area composed of the object and a shadow resulting from the thickness of the object based on the scan image, and a standard Information on the diameter of a disk-type storage medium, which is a known circular object whose outer shape is defined, and a memory in which shadow information predetermined according to the thickness of the disk-type storage medium and the specific angle is stored Means, an image forming means for forming an image on a label surface of a disk-type storage medium which is a circular known object whose outer shape is defined by a standard, the dimensions of the first scan area, and the A determination unit that determines whether or not the object is the known object based on a comparison with information relating to a diameter of the disk-type storage medium stored in a storage unit; and the determination unit determines whether the object is A second scan area obtained by removing a part of a shadow area corresponding to a shadow generated from the thickness of the known object from the first scan area based on the shadow information when it is determined that the object is the known object A second scan area specifying means for specifying the first scan area, and a center of gravity of the first scan area as a center of gravity when the determination means determines that the object is not the known object. Scan area specifying means for specifying a square area.
When the object has a considerable thickness, the shadow of the object is read as an image when the object is illuminated and read. If the object and the lighting environment at the time of reading are known, the shadow shape of the object can be estimated. According to the present invention, the excluding part of the shadow area which is estimated to correspond to the shadow of the known object from the first scan area on identified based on first scan area corresponding to the known object in the scanned image In order to identify the two scan areas , the scan image can be corrected so that the shadow of the known object is reduced . The scan area may be defined on the coordinate plane where the scan image is defined, or may be defined on the coordinate plane where the reading area is defined.

The image processing system further includes a distortion correction unit that corrects a ratio of a length in a vertical direction and a length in a horizontal direction of the scanned image in the second scan region by enlarging or reducing based on predetermined distortion correction information. You may prepare.
In general, the ratio between the sampling interval at the time of document reading and the display interval of the pixels of the scanned image is slightly different between the main scanning direction and the sub-scanning direction. Therefore, in general, the aspect ratio of the object displayed by the scanned image is slightly different from the aspect ratio of the actual object. If the correspondence between the sampling interval during document reading and the display interval of the scan image pixels is known in the main scanning direction and the sub-scanning direction, the ratio of the sampling interval and the scan image pixel display interval according to the correspondence relationship Can be corrected so that the main scanning direction and the sub-scanning direction coincide with each other. According to the present invention, the ratio between the length in the vertical direction and the length in the horizontal direction of the second scan region corresponding to the known object is corrected by enlargement / reduction based on predetermined distortion correction information. For this reason, according to the present invention, the aspect ratio of the known object displayed by the scan image can be exactly matched with the aspect ratio of the actual object. In this specification, “display” is used to include both print display and screen display.

The functions of the plurality of means provided in the present invention are realized by hardware resources whose functions are specified by the configuration itself, hardware resources whose functions are specified by a program, or a combination thereof. The functions of the plurality of means are not limited to those realized by hardware resources that are physically independent of each other.
In addition, the present invention can be specified not only as an apparatus and method invention, but also as a program invention and a recording medium recording the program.

Embodiments of the present invention will be described below based on a plurality of examples. In each of the embodiments, the component having the same reference sign corresponds to the component of the other embodiment having the reference sign.
(First Example)
FIG. 2 is a perspective view showing the external appearance of the multi function device 1 as the first embodiment of the image processing system according to the present invention. FIG. 3 is a block diagram showing the multifunction device 1. FIG. 4 is a schematic diagram showing the structure of the scan unit 50 of the multifunction machine 1. The multi-function device 1 prints image data read from a document to a personal computer (PC) (not shown), a function to print image data input from the removable memory 24 or the PC, and prints image data read from the document. With functions.

  A scanning unit 50 as a reading unit is housed in the upper case 18 and includes a light source 52, an image sensor 54, an AFE (Analog Front End) unit 56, a sensor driving unit 74, a sensor carriage driving unit 76, and the like. The light source 52 is composed of a fluorescent tube lamp or the like that is long in the main scanning direction. The image sensor 54 driven by the sensor driving unit 74 is a linear image sensor such as a color CCD linear image sensor having RGB light receiving elements of three channels. The image sensor 54 is mounted on a sensor carriage 96 that moves in parallel with the transparent document table 16. The image sensor 54 outputs an electrical signal correlated with the density of the optical image of the object 92 formed on the light receiving surface by the lens 98 and the mirror 100. The sensor carriage drive unit 76 includes a motor, a drive belt, a drive circuit, etc. (not shown). The sensor carriage drive unit 76 reciprocates the sensor carriage 96 along a guide rod (not shown) installed perpendicularly to the longitudinal direction of the main scanning region. The image sensor 54 moves in a direction perpendicular to the longitudinal direction of the main scanning region, so that a two-dimensional image can be read. The AFE unit 56 includes an analog signal processing unit such as amplification and noise removal, an A / D converter, and the like. The scan unit 50 may have the above-described lens reduction type configuration or a close-contact type configuration.

  The print unit 86 of the multifunction machine 1 is housed in the lower case 20 and includes a recording head 84, a head driving unit 82, a head carriage driving unit 78, a paper feeding unit 80, and the like for forming an image on a printing medium by an inkjet method. The print unit 86 may be configured to support other printing methods such as a laser method. The recording head 84 is provided on a head carriage (not shown) on which an ink cartridge is mounted, and includes a nozzle, a piezo element, an ink passage, and the like. The head carriage drive unit 78 includes a motor, a drive belt, a drive circuit, and the like (not shown). The head carriage drive unit 78 reciprocates the recording head 84 in the direction perpendicular to the print medium conveyance direction. The paper feeding unit 80 includes a paper transport roller, a motor, a drive circuit, and the like (not shown). The paper feeding unit 80 conveys the paper and the CD tray 28 (see FIG. 2) in a direction perpendicular to the moving direction axis of the recording head 84 by rotating the paper carrying roller. The print unit 86 is configured to convey the CD tray 28 and form an image on the label surface of the CD positioned on the positioning unit 30 of the CD tray 28.

The external memory controller 70 is connected to the removable memory 24 inserted into the card slot 22 (see FIG. 2). Data stored in the removable memory 24 is read by the external memory controller 70 and transferred to the RAM 60.
The operation unit 68 includes an LCD 34 for displaying a menu and various push buttons 36, 38, and 40 such as a selection key, a determination key, and a cancel key for operating the menu.

  The control unit 58 includes a RAM 60, a ROM 62, a CPU 64, and a digital image processing unit 66. The CPU 64 executes a control program stored in the RAM 60 to control each unit of the multifunction device 1. The ROM 62 is a non-volatile memory that stores a control program. The RAM 60 is a volatile memory that temporarily stores various data such as control programs and scanned images. The control program may be stored in the ROM 62 via a network from a remote server, or may be stored in the ROM 62 via a computer-readable storage medium such as the removable memory 24. The digital image processing unit 66 forms part of a reading unit and a printing unit, and cooperates with the CPU 64 for image processing such as gamma correction, resolution conversion, image color balance correction, binarization, and color space conversion for a scanned image. It is a dedicated circuit such as a DSP that operates and executes.

The hardware configuration of the multifunction machine 1 has been described above. Next, a shadow appearing in the scanned image will be described.
As shown in FIG. 4, the light source 52 is provided at a position off the optical path from the image sensor 54 to the surface of the document table 16. The light source 52 illuminates a main scanning area on the document table 16 that is an image formed on the image sensor 54 at a specific position from a direction that forms a specific angle with a perpendicular to the surface of the document table 16. For this reason, when the object 92 is thick, a shadow of the object 92 illuminated by the light source 52 is formed on the original mat 90 fixed to the original cover 10, and this shadow appears in the scanned image.

FIG. 5 is a block diagram illustrating a control program of the multifunction machine 1.
The scan control module 102 is a program component that causes the control unit 58 to function as an image acquisition unit. The scan control module 102 controls the scan unit 50 in response to the reading start request and stores the scanned image in the RAM 60.
The CD label processing module 104 is a program component that causes the control unit 58 to function as a first scan region specifying unit, a recognition unit, a second scan region specifying unit, and a distortion correcting unit.

  The CD label processing module 104 identifies the first scan area by dividing the low resolution scan image obtained by the first reading. Hereinafter, the low-resolution scan image acquired by the first reading is referred to as a first scan image. A threshold value of a level obtained by subtracting a predetermined margin from the gray level of the pixel corresponding to the original mat 90 is used for area division. The CD label processing module 104 recognizes that the object is a CD through feature analysis of the first scan image. In the feature analysis, for example, it is analyzed whether or not the shape of the first scan region corresponds to the standard size of the CD.

  The CD label processing module 104 deletes an area corresponding to the outside of the second scan area of the high-resolution scan image acquired by the second reading based on the clip information. Hereinafter, the high-resolution scan image acquired by the second reading is referred to as a second scan image. The clip information includes the sub-scanning direction, the angle formed by the optical path from the light source 52 to the main scanning area and the optical path from the main scanning area to the image sensor 54, the diameter of the CD defined as the standard dimension, and the thickness. The information is set in accordance with the information stored in the ROM 62 in advance. The clip information is information for specifying what percentage of the maximum width with respect to the diameter of the scanned image of the CD and which shadow appears in the scanned image on either side of the CD in the sub-scanning direction. The clip information can be set by a ratio if the reading resolution of the CD is arbitrary, and can be set by the number of pixels if the reading resolution of the CD is known.

  The CD label processing module 104 enlarges / reduces the second scan image according to the print resolution. At this time, the CD label processing module 104 enlarges / reduces the second scan image at different magnifications based on the distortion correction information, and transforms the second scan image into a square having a size corresponding to the print resolution and the size of the print area. . The distortion correction information is information that is set according to the ratio of the sampling interval in the main scanning direction and the sampling interval in the sub-scanning direction at the time of reading, and is stored in the ROM 62 in advance. The distortion correction information is set so that the pixel interval during display is the same in the main scanning direction and the sub-scanning direction. For this reason, the aspect ratio of the actual object and the aspect ratio of the displayed object are obtained by scaling the second scan image according to the ratio of the sampling interval in the main scanning direction and the sampling interval in the sub-scanning direction at the time of reading. The aspect ratio can be matched.

  The CD label processing module 104 generates a print target page based on the template and the second scan image stored in advance in the ROM 62. This template includes a mask corresponding to the shape of the CD label, and position information for overlapping the second scan image and the mask at a predetermined position on the page. The mask is two-dimensional array information for setting non-printing target pixels as printing unnecessary pixels.

  The print control module 106 is a program component that causes the control unit 58 and the print unit 86 to function as printing means and print data generation means. The print control module 106 generates print data by performing a process of converting the color space of the print target page into a color space such as CMYK which is an ink color space, a binarization process, an interlace process, and the like. Based on this, the print unit 86 is controlled.

FIG. 6 is a flowchart showing an image processing method by the multifunction machine 1 that executes the above-described control program by the control unit 58. The process shown in FIG. 6 is started when the multi-function device 1 transitions to the CD copy mode by a predetermined menu operation.
In step S100, the control unit 58 executes the scan control module 102 and, when a CD copy start request is received by a predetermined menu operation, causes the scan unit 50 to read the entire readable range on the document table 16 at a low resolution. The first scan image is stored in the RAM 60. FIG. 1A shows a first scan image 110 acquired with a CD placed on the document table 16. In the first scanned image 110, a CD 114 and a CD shadow 116 appear. FIG. 7A shows the first scan image 130 acquired in a state where a thin object such as paper is placed on the document table 16. In the first scan image 130, a thin object 132 appears, and no shadow of the object 132 appears.

In step S102, the control unit 58 executes the CD label processing module 104, identifies the areas of the objects 114 and 132 and the shadow 116 by area division of the first scan image, and further, the area and shadow of the objects 114 and 132. The first scan areas 112 and 134 corresponding to the rectangle circumscribing the area where the areas 116 are merged are identified. When the object is a CD, the gray level of the area corresponding to the shadow 116 of the CD is considerably lower than the gray level of the area corresponding to the original mat 90, and therefore, as shown in FIG. 112 includes an area corresponding to the CD 114 and the shadow 116 of the CD. 1 and 7 show the first scan areas 112 and 134 and the second scan areas 115 and 137 superimposed on the first scan images 110 and 130 and the second scan images 113 and 135. The first scan areas 112 and 134 and the second scan areas 115 and 137 are areas on the surface of the document table 16. Next, the control unit 58 sets the first scan areas 112 and 134 as the second reading area. In addition, as a method for specifying the regions of the objects 114 and 132, edge detection may be used in addition to region division using a gray level threshold.

  In step S <b> 104, the control unit 58 executes the CD label processing module 104 and determines whether the object is a CD or a non-CD based on the dimensions of the first scan areas 112 and 134. Specifically, for example, the control unit 58 determines whether the object is a CD or other than a CD depending on whether or not the dimensions of the first scan regions 112 and 134 are 12 cm (± 3%) × 12 cm (± 3%). Determine if there is. If the control unit 58 determines that the object is a CD, the process proceeds to step S106. If the control unit 58 determines that the object is not a CD, the control unit 58 proceeds to step S118. As a feature of the CD used for specifying that the object is a CD, it is possible to use, for example, the presence of a circular opening at the center other than the outer dimensions. By specifying the object by feature analysis, it is not necessary for the user to specify the object in the interactive mode, and the operation procedure of the multifunction machine 1 can be reduced.

  In step S106 and step S118, the control unit 58 executes the scan control module 102, causes the scan unit 50 to read the reading area set in step S102 with high resolution, and stores the second scan image in the RAM 60. FIG. 1B shows a second scan image 113 acquired with a CD placed on the document table 16. In the second scanned image 113, a CD 114 and a CD shadow 116 appear. FIG. 7B shows the second scan image 135 acquired in a state where a thin object such as paper is placed on the document table 16. In the second scan image 135, a thin object 132 appears, and no shadow of the object 132 appears.

  In step S108, which is executed when the object is a CD, the control unit 58 executes the CD label processing module 104 and removes one end of the first scan area 112 by a predetermined width based on the above-described clip information. The scan area 115 is specified (see FIG. 1C), and the area of the second scan image 113 corresponding to the outer area 118 of the second scan area 115 is deleted. As a result, a part of the area corresponding to the shadow 116 is deleted from the second scan image 113, and the second scan image 113 is deformed as shown in FIG.

  In step S110 that is executed when the object is a CD, the control unit 58 executes the CD label processing module 104, and enlarges the second scan image 113 in the second scan region 115 based on the distortion correction information described above. The second scan image 113 is reduced and transformed into a square having a size corresponding to the size of the print area and the print resolution (see FIG. 1E). The second scanned image 113 is enlarged / reduced at different magnifications based on the distortion correction information set in advance according to the characteristics of the scan unit 50, and the aspect ratio of the original CD label image and the multi-function device 1 are printed. The aspect ratio of the CD label image can be exactly matched. Further, it is possible to prevent a crescent-shaped blank from being formed in the label area 156 of the CD that is the print medium.

  In step S <b> 120 executed when the object is not a CD, the control unit 58 specifies a square area inscribed in the first scan area 134 as the second scan area 137 with the center of gravity of the first scan area 134 as the center of gravity. (See FIG. 7C). Further, the control unit 58 deforms the second scan image 135 into a square by deleting both end portions 136 and 138 corresponding to the region obtained by removing the second scan region 137 from the first scan region 134 (FIG. 7D )reference).

In step S122, which is executed when the object is other than a CD, the second scan image 135 is enlarged or reduced at the same magnification in the vertical and horizontal directions according to the size of the print area.
In step S112, the control unit 58 executes the CD label processing module 104, and generates a print target page based on the template and the second scan images 113 and 135 described above.

  FIG. 8 is a schematic diagram for explaining a print target page generation process using a template. The mask 140 constituting the template is set in accordance with the standard size and printing resolution of the CD 158 and stored in the ROM 62 in advance. The mask 140 has corner regions 142, 146, 148, 144 having a value for setting the pixel as a transparent level or a non-print pixel, a circular center region 150, and an annular shape having a value that does not change the pixel. And a non-setting area 151. The diameter of the central region 150 is equal to the inner diameter of the label region 156 of CD158. The outer diameter of the non-setting area 151 is equal to the outer diameter of the label area 156 of the CD 158, and is equal to the length of one side of the second scan images 113 and 135 subjected to the processing up to step S110 or step S122. When the mask 140 and the second scan image 113 are overlapped and arranged on the print target page so that the respective centers of gravity coincide with each other, a print target page on which an image is formed only on the label area 156 of the CD 158 is formed. As a result, it is possible to prevent ink from adhering to the platen or CD tray 28 located directly below the inner edge transparent portion 154 of the CD 158, the outer edge transparent portion 160 of the CD 158, or the central opening 152 of the CD 158. The shape of the mask 140 is not limited to the above-described configuration. For example, the mask 140 has a configuration in which ink does not adhere to the highly reflective regions located inside and outside the CD label region 156, or has a predetermined shape on the outer and inner edges of the CD label region 156 A configuration in which a margin is set or a configuration in which an image is formed also on the inner edge transparent portion 154 and the outer edge transparent portion 160 can be adopted.

In step S114, the control unit 58 executes the print control module 106 to generate print data by performing color space conversion, binarization, interlace processing, and the like on the print target page.
In step S116, the control unit 58 executes the print control module 106, controls the print unit 86 based on the print data, and prints an image on the CD 158 placed on the CD tray 28. As a result, an image of the object placed on the document table 16 is printed on the CD 158. As a printing medium for printing an image of the object placed on the document table 16, a plain seal having a peeling area corresponding to the label area 156 of the CD 158 can be used in addition to the CD 158.

(Second embodiment)
FIG. 9 is a flowchart showing an image processing method according to the second embodiment of the present invention. The second embodiment is different from the first embodiment in the clip processing of the second scan region, and is otherwise substantially the same as the first embodiment. This will be specifically described below.
When the object is a CD, when the first scan image is divided into regions in step S102, a first scan region 112 as shown in FIG. 10A is set depending on the threshold value. A CD 114 and a shadow 116 of the CD appear in the first scan image 110 acquired by the first reading. The region of the CD 114 includes a region 111 corresponding to the transparent portion at the outer edge portion of the CD and a region 119 corresponding to the transparent portion at the inner edge portion of the CD. The CD shadow 116 is formed outside the region 111 corresponding to the transparent portion of the outer edge of the CD.
As a result, in step S106 in which the second reading is performed, a second scan image 113 shown in FIG. 10B is acquired.

  In step S208, the control unit 58 executes the CD label processing module 104 and specifies the second scan area 115 excluding the predetermined width from the peripheral edge of the first scan area 112 based on the clip information (FIG. 10C). (See), the area of the second scan image 113 corresponding to the outer area of the second scan area 115 is deleted. The deletion width is set according to the width of the transparent portion of the CD, the thickness of the CD, and the diameter of the CD. As a result, a part of the shadow 116 of the CD and a part of the transparent part 111 of the CD are deleted from the second scan image 113, and the second scan image 113 is deformed as shown in FIG.

In step S110, the second scan image 113 shown in FIG. 10D is enlarged / reduced and transformed into a square according to the size of the print area and the print resolution.
In step S112, as shown in FIG. 11, the mask 140 and the second scan image 113 are allocated to the print target page. The length of one side of the mask 140 corresponds to the outer diameter of the annular annular region 117 of the CD. The diameter of the circular central region 150 of the mask 140 corresponds to the inner diameter of the opaque region 117 of the CD. As a result, the CD transparent portions 111 and 119 are prevented from being printed in light gray or the like in the label area 156 of the CD 158.

(Third embodiment)
FIG. 12 is a flowchart showing an image processing method according to the third embodiment of the present invention. The third embodiment is different from the first embodiment in the method for specifying the object, and is otherwise substantially the same as the first embodiment. This will be specifically described below.
In step S300, the control unit 58 executes the CD label processing module 104, accepts an object specifying operation as a predetermined menu operation, and sets the type of the object according to the object specifying operation.

  In step S304, the control unit 58 executes the CD label processing module 104 to determine whether the type of the object is set to CD or other than that, and if it is set to CD, the control unit 58 performs step S106. Proceed to the process, and if it is set to other than CD, the process proceeds to step S118. That is, the control unit 58 recognizes whether or not the object is a CD without performing feature analysis of the first scan images 110 and 130 in the first scan regions 112 and 134. For this reason, according to the third embodiment, it is possible to reduce the time spent for processing for feature analysis and the development / manufacturing costs.

  The embodiment in which the present invention is applied to the multifunction machine 1 has been described above. However, the present invention can also be applied to a system including a PC and a printer and a scanner connected to the PC. The present invention can also be applied to a system including a scanner capable of outputting a scan image to a removable memory and a printer capable of inputting an image from the removable memory. In this case, the external memory controller provided in the printer constitutes a part of the image acquisition means according to the present invention. According to the present invention, a complete scan image is stored in a memory in the scanner system, the scanner generates a print target page to which the scan image and the mask are allocated, and the scanner is an external system for print data of the print target page. The present invention can also be applied to a system that outputs to a printer. Further, the present invention is applied to a printer that acquires a scan image from a scanner, generates a print target page to which the acquired scan image and a mask are assigned, generates print data based on the print target page, and prints the scan image. You can also

In the above-described embodiment, the CD is exemplified as the object. However, the object may be a known object whose shape and characteristics can be specified by a standard or the like, for example, a standard book. When the target is a standard book, the thickness of the target is unknown, but since a margin is generally formed at the outer edge of the page, it is possible to remove the shadow using the feature on the image of the page margin. Is possible. Needless to say , CD, CD-R, CD-RW, DVD, etc. are included in the standards that can specify the shape and characteristics of the object .

FIG. 3 is a schematic diagram showing a scanned image according to the first embodiment of the present invention. 1 is a perspective view showing an external appearance of a multifunction machine according to a first embodiment of the present invention. 1 is a block diagram of a multifunction machine according to a first embodiment of the present invention. The schematic diagram which concerns on the 1st Example of this invention. The block diagram of the control program which concerns on 1st Example of this invention. 3 is a flowchart showing an image processing method according to the first embodiment of the present invention. FIG. 3 is a schematic diagram showing a scanned image according to the first embodiment of the present invention. The schematic diagram which concerns on the 1st Example of this invention. 7 is a flowchart showing an image processing method according to a second embodiment of the present invention. The schematic diagram which shows the scan image which concerns on 2nd Example of this invention. The schematic diagram which concerns on the 2nd Example of this invention. 9 is a flowchart showing an image processing method according to a third embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Multifunction device, 16 Document stand, 50 Scan unit (reading means), 58 Control part (Image acquisition means, 1st scan area | region identification means, recognition means, 2nd scan area | region identification means, distortion correction means), 66 Digital image processing Part (reading means, printing means), 86 printing unit (printing means), 90 original mat, 92 object, 102 scan control module (image acquisition means), 104 label processing module (first scan area specifying means, recognition means, second (Second scan area specifying means, distortion correcting means), 106 print control module (printing means), 110 first scan image, 112 first scan area, 112 second scan area, 113 second scan image, 114 object, 115 first Two scan areas, 116 shadows, 130 first scan image 132 object 134 first scan area, 135 Second scanned image, 137 a second scan area, 140 mask

Claims (3)

Image acquisition means for acquiring a scanned image read from an object placed on a document table and covered with a document mat and illuminated from a direction that makes a specific angle with a perpendicular to the surface of the document table;
Means for identifying a first scan area of a rectangle circumscribing an area composed of the object and a shadow generated from the thickness of the object based on the scan image;
Information regarding the diameter of the disk type storage medium, which is a circular known object whose outer shape is defined by the standard, and shadow information predetermined according to the thickness of the disk type storage medium and the specific angle are stored. Storage means
Image forming means for forming an image on a label surface of a disk-type storage medium, which is a circular known object whose outer shape is defined by a standard;
Determining means for determining whether or not the object is the known object based on a comparison between the size of the first scan area and information on the diameter of the disk-type storage medium stored in the storage means; ,
When it is determined by the determination means that the object is the known object,
A second scan area specifying means for specifying a second scan area in which a part of a shadow area corresponding to a shadow generated from the thickness of the known object is excluded from the first scan area based on the shadow information ;
When the determination means determines that the object is not the known object,
A scan area specifying means for specifying a region of square the center of gravity of the first scan area and the centroid is inscribed in the first scan area,
An image processing system comprising:   The image processing apparatus further comprises distortion correction means for correcting the ratio of the length in the vertical direction and the length in the horizontal direction of the scanned image in the second scan region by enlargement / reduction based on predetermined distortion correction information. The image processing system according to claim 1. The image processing system according to claim 2 , wherein the distortion correction unit corrects the scan image in the second scan region into a square.

Images