JP5560803B2 - Image processing device - Google Patents

Description

  The present invention relates to an image processing apparatus.

  2. Description of the Related Art Conventionally, there are image processing apparatuses that perform image processing by distributing a job related to input image processing to other apparatuses between apparatuses connected on a network. Patent Documents 1 and 2 are known as conventional techniques relating to an image processing apparatus that performs this image processing by distributing it to other apparatuses. Patent Documents 1 and 2 disclose techniques for efficiently distributing jobs by a plurality of image processing apparatuses connected to a network.

  However, in the above-described prior art, it is possible to perform efficient processing distribution by causing a device with high processing performance to perform distributed processing, but there are cases where the processing result desired by the user cannot always be obtained. . For example, even a device with high processing performance cannot satisfy a user's request for a result with high processing accuracy when processing accuracy such as filter processing is low.

  The present invention has been made in view of the above, and provides an image processing apparatus capable of obtaining a processing result desired by a user even when image processing is performed by being distributed to other apparatuses. For the purpose.

In order to solve the above-described problems and achieve the object, an image processing apparatus according to the present invention is implemented by another image processing apparatus from a communication unit and another image processing apparatus connected via the communication unit. and filtering, and the index of image quality performance of the filter of the processing capacity of the filtering, an acquisition unit configured to acquire device information indicating the obtained the index and the index is obtained the another image processing apparatus Storage means for holding the correspondence between the image processing apparatus, operation means for receiving an operation instruction from a user, and image processing for performing image processing instructed by the operation means for each unit image processing that is the minimum unit of the instructed image processing means and, when said filtering processing according to the image processing including the processing result is instructed by the operation unit, the instructions have been filtered, the other image processing which has been held in the storage means Comprising said index corresponding to the device, and indicators quality performance of the filter of the device itself, to the original, and a distributed processing unit to perform distributed to satisfy the image processing apparatus derived from the processing result It is characterized by that.

  According to the present invention, there is an effect that it is possible to obtain a processing result desired by a user even when image processing is performed by being distributed to other apparatuses.

FIG. 1 is a diagram illustrating a configuration of an image processing system according to the present embodiment. FIG. 2 is a diagram illustrating a list of apparatuses that perform image processing in each mode. FIG. 3 is a diagram showing a list of matrix sizes for filter processing. FIG. 4 is a diagram showing a list of filter coefficients for moire removal. FIG. 5 is a diagram illustrating a smoothing coefficient. FIG. 6 is a block diagram showing image processing of the pre-stage image processing unit. FIG. 7 is a block diagram illustrating image processing of the subsequent image processing unit. FIG. 8 is a diagram illustrating a configuration of an image processing system according to a modification. FIG. 9 is a diagram showing a list of matrix sizes for filter processing. FIG. 10 is a diagram illustrating sharpening filter coefficients. FIG. 11 is a diagram illustrating the configuration of the reading device of the MFP. FIG. 12 is a block diagram showing the configuration of the MFP. FIG. 13 is an explanatory diagram for explaining a reading operation in the pressure plate reading mode. FIG. 14 is an explanatory diagram for explaining a reading operation in the see-through DF reading mode. FIG. 15 is a block diagram illustrating a configuration relating to reading processing. FIG. 16 is a block diagram illustrating configurations of the analog video processing unit and the shading correction processing unit. FIG. 17 is a block diagram illustrating a configuration of the image processing unit. FIG. 18 is a conceptual diagram illustrating γ conversion. FIG. 19 is an explanatory diagram for explaining an example of γ conversion.

  Hereinafter, an embodiment of an image processing apparatus according to the present invention will be described in detail with reference to the accompanying drawings. The image processing apparatus may be used for any information device having an image processing function, such as an MFP (multifunction peripheral), a printer, a scanner, or a personal computer.

  FIG. 1 is a diagram illustrating a configuration of an image processing system 100 according to the present embodiment. As shown in FIG. 1, an image processing system 100 includes information devices such as MFPs 101, 102, 103, 104, 105, 106, a printer 107, and a scanner 108 via a communication network NW such as the Internet or a LAN (Local Area Network). The system configuration is connected so that they can communicate with each other. Although not shown in this example, the image processing system 100 includes not only an MFP, a printer, and a scanner, but also information such as a single function facsimile, a personal computer that does not include a reading device and a writing device, and performs only image processing. The structure provided with an apparatus may be sufficient.

  In the image processing system 100, the information devices connected to the communication network NW described above communicate unit image processing and the value indicating the processing performance of the information device with each other via the communication network NW as device information. Here, the unit image processing includes inter-line correction processing, image region separation processing, scaling processing, γ conversion processing, filter processing, color conversion processing (for reading device), color conversion processing (for writing device), floor A group of minimum image processing for realizing one function such as tone conversion processing is shown.

  Communication of information between information devices uses a predetermined communication protocol. This communication protocol may be any communication protocol as long as information of the information device can be communicated.

  For example, when the power of the MFP 101 is turned on, the CPU (details will be described later) of the MFP 101 scans for information devices that can perform distributed image processing on the communication network NW. The MFP 101 holds the network information of the information device that has responded to this scan. The network information is information that can specify listening such as an IP address of TCP / IP, but may be other information such as a MAC address as long as the information can identify the device. In the illustrated example, the MFPs 102, 103, 104, 105, 106 and the printers 107, 108 respond to the scan of the MFP 101.

  The CPU of the MFP 101 inquires the type of unit image processing that can be performed to the information device that has responded to the scan. Next, the CPU of the MFP 101 inquires about the processing performance of the image processing of each processing. Each information device holds all devices capable of distributed processing, unit image processing that can be performed by the device, and performance of unit image processing. For example, information on the matrix size is obtained as an index representing the processing performance of the filter process from an information device that can perform the filter process. The CPU of the MFP 101 obtains information about the index of the image quality performance of the filter from all information devices that can perform the distributed processing of the filter processing, and then stores the correspondence between the index and the information device from which the index is obtained in the RAM or the like. Keep it. Unit image processing other than filter processing, line-to-line correction processing, image area separation processing, scaling processing, γ conversion processing, color conversion processing (for reading device), color conversion processing (for writing device), gradation conversion The same applies to processing.

  In response to a request for a document type or a user processing result, the MFP 101 uses information on a unit image processing type of each information device and a value indicating the processing performance of the unit image processing obtained by the communication described above. For example, operation switching when the high-performance mode is selected, and distributed processing control of image processing are performed. The same control is performed for the MFPs 102, 103, 104, 105, 106 and printers 107, 108 which are information devices other than the MFP 101.

  FIG. 2 is a diagram illustrating a list of apparatuses that perform image processing in each mode. More specifically, the contents of image processing performed by the MFP 101 and the correspondence between information devices that perform the image processing in each mode are listed. As shown in FIG. 2, the MFP 101 performs all unit image processing by itself when it is in the normal mode in which a request for a user processing result is set to normal. In the high-performance mode in which the request for the user's processing result is set high, distributed processing using the scanner 108 having high processing capability corresponding to the user's request is performed.

  Here, a case will be described as an example where the user copies a specific document in the high-performance mode on the MFP 101. The CPU of the MFP 101 performs unit image processing of each information device obtained by communication with information devices capable of executing high-performance image processing expected by a request for a document type or a user processing result, and image processing settings at that time. And information on values indicating the processing performance of unit image processing.

  In the example of FIG. 2, smooth image processing can be performed by the filter processing of the scanner 108, so that structured image processing can be performed. Therefore, the CPU of the MFP 101 executes image processing (interline correction processing, image area separation processing, scaling processing, and γ conversion processing) up to immediately before the filter processing by itself. Next, the CPU of the MFP 101 requests the scanner 108 capable of performing high-performance filter processing to perform filter processing for smoothing. Specifically, the filter coefficient of the filter process is instructed and the image data is transferred.

  The CPU of the scanner 108 executes smoothing filter processing using the given filter coefficient on the image data sent from the MFP 101, and sends the processed image data back to the MFP 101. The CPU of the MFP 101 executes image processing (color conversion processing (for a reading device), color conversion processing (for a writing device), and gradation conversion processing) after filtering on the received image data by itself. Finally, the image is output by the writing device.

  Here, a detailed operation at the time of selecting the above-described high-performance mode will be described. The example described here is as follows. The specific manuscript is a halftone photo manuscript. The processing when the user selects the high-performance mode for the halftone photo original is copy image quality of a photographic image without moire. The process necessary for obtaining the processing result in the high-performance mode is a high-performance smoothing process using a filter process.

  The user wants to copy a photographic manuscript composed of halftone dots with no moire on the paper. Generally, in order to eliminate moire when a halftone original is read, a filtering process by smoothing is performed. Also, gradation conversion processing is performed for output by a small value writing device and output is performed to small values. Since dither processing is also performed at this time, dither processing for gradation conversion processing of the period of halftone dots of the document is performed. Moire may occur depending on the period of the number of lines. In this case, the halftone dots of the scanned image are converted into a smooth image by the smoothing process, and moiré that appears when output by the writing device is removed.

  However, if the number of lines of the halftone dot is high, even if smoothing processing with a relatively small matrix size can eliminate the occurrence of moire, if the number of lines used in the manuscript is low, the smoothing performance deteriorates. . In this case, it is necessary to increase the matrix size for smoothing the low-line-number halftone dot image, but the MFP 101 can only perform smoothing using a 3 × 3 size matrix.

  Therefore, the CPU of the MFP 101 refers to the processing performance of the filter processing obtained from the information device via the communication network NW described above, and checks the information device that can perform a smoothing process higher than the matrix calculation of the MFP 101. FIG. 3 is a diagram showing a list of matrix sizes for filter processing. The CPU of the MFP 101 acquires the list illustrated in FIG. 3 from the information device via the communication network NW, and checks the information device that can perform smoothing processing higher than the matrix calculation of the MFP 101 by referring to this list. .

  Further, the CPU of the MFP 101 checks in advance the filter matrix size and the smoothing coefficient of the smoothing process that suppresses the generation of moire due to the combination of the number of lines of dither processing for the writing device and the number of halftone lines of the original. In this case, because the filter size of the own device is not necessarily 3 × 3, a filter size that is possible with that size is not prepared, but filter coefficients that are considered in advance by distributed processing are stored in advance in a ROM or the like. .

  FIG. 4 is a diagram showing a list of filter coefficients for moire removal. A list shown in FIG. 4 is stored in advance in the ROM of the MFP 101. For example, the smoothing coefficient for moire removal when the original is “number of lines B” is “coefficient b”. Assuming that the number of halftone dots of the document used by the user in this example is “number of lines E”, in order to smooth the halftone dots of “number of lines E”, according to the example of FIG. “Coefficient e” is required as the conversion factor. FIG. 5 is a diagram illustrating the smoothing coefficient, and specifically illustrates the smoothing coefficient e described above.

  Since the MFP 101 can only perform 3 × 3 matrix calculations, high-quality smoothing processing cannot be performed. The CPU of the MFP 101 determines that higher quality processing can be performed by using another information device on the communication network NW than the own device in response to a request desired by the user, and according to the example of FIG. Distributed processing using information equipment. Here, the scanner 108 is selected. The CPU of the MFP 101 transmits image data and the smoothing coefficient e illustrated in FIG. 5 to the scanner 108.

  Here, image processing in an information device such as the MFP 101 will be described. FIG. 6 is a block diagram showing image processing of the former image processing unit, and FIG. 7 is a block diagram showing image processing of the latter image processing unit. One block in FIGS. 6 and 7 (for example, the inter-line correction processing unit 41a) corresponds to unit image processing. FIG. 6 illustrates the configuration of image processing performed for the reading device. FIG. 7 illustrates the configuration of image processing performed for the writing device. In the case of copying or the like, first, image processing for the reading device is performed, and then image processing for the writing device is performed. Therefore, image processing performed for the reading device is performed in the preceding image processing and image processing for the writing device. The processing is referred to as post-stage image processing. Note that the post-stage image processing may be performed not only when outputting to paper, but also when outputting to a display device such as a monitor.

  Since the MFP 101 and the like have both a reading device and a writing device, the MFP 101 includes two components, a front image processing unit 40a and a rear image processing unit 40b. An information device such as the scanner 108 having only a reading device includes only the pre-stage image processing unit 40a. Similarly, an information device having only a writing device such as the printer 107 includes only the subsequent image processing unit 40b. The scanned images of the MFP 101 and the scanner 108 and the printed images of the printer 107 are once held in a memory or an external storage device when the image processing is completed in order to reuse image data. Note that details of the configurations of the upstream image processing unit 40a and the downstream image processing unit 40b will be described later.

  Here, the flow of image processing when the distributed processing performed by the MFP 101 and the scanner 108 is performed will be described. The MFP 101 temporarily stores the image data after the read signal processing in the buffer memory. The image data stored in the buffer memory is transferred page by page to the preceding image processing unit 40a and the succeeding image processing unit 40b for image processing.

  As described above, in the high-performance mode for a halftone photo original, only the filter processing is distributed by the scanner 108, and other image processing is performed by the own device. Therefore, the CPU of the MFP 101 sets the unit image processing subsequent to the filter processing unit 41e to a through mode in which only image data is passed.

  Specifically, in the MFP 101, an image after scanner signal processing that has read a document under the control of the CPU is accumulated in a buffer memory, and is transferred to the pre-stage image processing unit 40a page by page by the buffer memory controller 43a. . In the pre-stage image processing unit 40a, image area separation processing, scaling processing, and γ conversion processing are performed on the transferred image signal by the interline correction processing unit 41a, image region separation processing unit 41b, and γ conversion processing unit 41d, and thereafter The filter processing and color conversion processing (for the reading device) are not processed, and are passed through the filter processing unit 41e and the color conversion processing unit 41f. The image data after the image processing by the pre-stage image processing unit 40a is stored in the memory 27b or the external storage device via the memory controller 27a. Image data stored in the memory 27b or the external storage device is transferred to the scanner 108 by the CPU of the MFP 101 via the communication network NW. At this time, the CPU of the MFP 101 transfers instruction information for performing filter processing to the scanner 108 together with the image data.

  The CPU of the scanner 108 stores the image data sent from the MFP 101 in the memory of the scanner 108 or an external storage device using the memory controller 27a. The image processing configuration of the scanner 108 includes a pre-stage image processing unit 40 a (see FIG. 6) as in the scanner 108. The scanner 108 performs only filter processing. Therefore, the CPU of the scanner 108 sets the inter-line correction process, the image area separation process, the scaling process, the γ conversion process, and the color conversion process to “through” and sets only the filter process by the filter processing unit 41e.

  The CPU of the scanner 108 sends the image data sent from the MFP 101 and once stored to the upstream image processing unit 40a via the memory controller 27a. Image data from the memory controller 27a is only subjected to filter processing by the filter processing unit 41e, and is then stored again in the memory or the external storage device via the memory controller 27a.

  The CPU of the scanner 108 transfers the accumulated image data after the filter process to the MFP 101 that is the request source of the filter process via the communication network NW. The MFP 101 stores the image data from the scanner 108 in its own memory or an external storage device via the memory controller 27a.

  Next, the MFP 101 performs image processing after the filter processing (only color conversion processing by the color conversion processing unit 41f). At this time, the interstage line correction process, the image area separation process, the scaling process, the γ conversion process, and the filter process in the pre-stage image processing unit 40a are set to “through” for nothing. Thereafter, in the MFP 101, the image data is flown from the beginning of the image processing for the reading device from the memory controller 27a, and the interline correction processing unit 41a, the image area separation processing unit 41b, the side magnification processing unit 41c, the γ conversion processing unit 41d, The filter processing unit 41e passes through, the color conversion processing (for the reading device) by the color conversion processing unit 41f, the color conversion processing (for the writing device) by the color conversion processing unit 42b and the gradation conversion processing unit 42c, and the floor. Tone conversion processing is performed, and the image data is output to the paper by the writing device by the output from the memory controller 27a.

  Next, a modified example of the above-described image processing system 100 will be described. FIG. 8 is a diagram illustrating a configuration of an image processing system 100a according to a modification. As shown in FIG. 8, the image processing system 100a has a configuration in which MFPs 101, 102, 103, 104, 105, a printer 107, and a scanner 108 are connected to a communication network NW. That is, the image processing system 100 a is configured by connecting a personal computer 109 instead of the MFP 106 in the image processing system 100.

  Also in such an image processing system 100a, as in the image processing system 100 described above, an information device connected to the communication network NW uses unit image processing and a value indicating processing performance of the information device as device information. Communicate with each other.

  FIG. 9 is a diagram showing a list of matrix sizes for filter processing. The unit image processing such as the filter processing matrix size and the value indicating the processing performance as shown in FIG. 9 are exchanged between the information devices of the image processing system 100a as device information. Similar to the distributed processing between the MFP 101 and the scanner 108 described above, image processing corresponding to an instruction from the user is performed by distributed processing using an information device having a processing capability corresponding to the user's request.

  Here, a case where the user designates the high-performance mode and prints on the printer 107 from the personal computer 109 will be described as an example. The print data output from the personal computer 109 is image data of a silver halide photograph, and the user expects a sharp photographic image print result. Specifically, the user performs printing using application software running on the personal computer 109. At this time, on the operation screen of the printer driver software prepared for printing on the printer 107, a print mode for performing gradation processing with an emphasis on gradation suitable for a photographic image is selected, and at this time Select high-performance mode and print. As illustrated in FIG. 9, the printer 107 cannot perform filtering in the high-performance mode by itself, and thus performs distributed processing using an information device that can perform filtering.

  The printer 107 temporarily holds the image data sent from the personal computer 109 in a memory or the like. At this time, the personal computer 109 is notified of an instruction that the print setting is a silver halide photograph and the high-performance mode. Since the printer 107 cannot perform the filtering process, the filtering process is performed using another information device. Here, the CPU of the printer 107 selects a feasible information device from the matrix size of the filter coefficients based on the information device information (see FIG. 9) described above.

  Since the matrix size of the sharpening process used here is 3 × 3, any information device may be used as long as the information device has a matrix size of 3 × 3 or more. In the case where there are a plurality of information devices that satisfy the condition of a matrix size of 3 × 3 or more, a method is selected in advance such that a device having the largest matrix size is selected from the devices satisfying the condition. Here, there are a plurality of models having a matrix size of 3 × 3 or more in accordance with this control, and among these, the MFP 101 having the maximum matrix size of 3 × 3 is requested to perform distributed processing.

  The CPU of the printer 107 transfers the image data filtering process to the MFP 101 and requests the MFP 101 to execute the filtering process as a distributed process using the sharpening filter coefficient illustrated in FIG. 10 as the sharpening filter. The MFP 101 returns the filtered image data to the printer 107. The printer 107 performs gradation processing on the image data received from the MFP 101 and outputs an image on paper.

  When the user designates the high-performance mode from the personal computer 109 and prints on the printer 107, the print data output from the personal computer 109 is halftone photo image data and the user has no moire image. In some cases, the print result is expected. In this case, the personal computer 109 outputs an instruction to the printer 107 that the print setting is a halftone photograph and the high-performance mode. In response to an instruction from the personal computer 109, the CPU of the printer 107 requests the scanner 108 to perform distributed processing based on the processing performance value of the filter processing illustrated in FIG. The contents are the same as those described above, except that the scanner 108 is requested to perform distributed processing.

  Here, a detailed flow of image processing when the distributed processing performed by the printer 107 and the MFP 101 is performed will be described. Note that the image processing configurations of the printer 107 and the MFP 101 are the same as those illustrated in FIGS. 6 and 7.

  The CPU of the printer 107 temporarily stores the image data sent from the personal computer 109 in the buffer memory. In the high-performance mode for printing in the silver halide photography mode, only the filter processing is distributed by the MFP 101, and other image processing is performed by the own machine. Filter processing cannot be performed by a single operation of the printer 107.

  In the high performance mode, the image data is stored in the memory or the external storage device via the memory controller 27a. The accumulated image data is transferred to the MFP 101 by the CPU of the printer 107 via the communication network NW. The CPU of the MFP 101 stores the image data sent from the printer 107 in the memory of the MFP 101 or an external storage device using the memory controller 27a.

  When performing the filter processing of the MFP 101, the filter processing unit 41e is used. Since only the filter process needs to be performed, the CPU of the MFP 101 passes through the interline correction processing unit 41a, the image area separation processing unit 41b, the side magnification processing unit 41c, the γ conversion processing unit 41d, and the color conversion processing unit 41f. It is set so that only the filter processing can be executed by the filter processing unit 41e.

  The CPU of the MFP 101 sends the image data sent from the printer 107 and once stored to the upstream image processing unit 40a via the memory controller 27a. The image data sent from the memory controller 27a is only subjected to filter processing by the filter processing unit 41e, and is then stored again in the memory or the external storage device via the memory controller 27a.

  The CPU of the MFP 101 transfers the image data accumulated after the filter processing to the printer 107 that is the processing request source via the communication network NW. The CPU of the printer 107 stores the image data from the MFP 101 in a memory or an external storage device via the memory controller 27a. The CPU of the printer 107 performs image processing of color conversion processing and gradation conversion processing by the color conversion processing unit 42b and the gradation conversion processing unit 42c on the accumulated image data, and the image data after the image processing is written by the writing device. Output to paper.

  Note that the CPUs of the information devices described above may exchange the unit image processing and the value indicating the processing performance of the information devices with each other as device information at predetermined time intervals. For example, information devices connected to the communication network NW may exchange device information every other hour.

  The image processing systems 100 and 100a have a drawback that they cannot respond to a request for distributed processing when the distributed processing cannot be performed due to a failure or maintenance. Therefore, by exchanging unit image processing and its processing capability as device information at regular intervals, the device information that can always be distributed can be kept up-to-date.

  The CPU of each information device described above is connected to the communication network NW before the power-off button on the operation panel of the own device is pressed by the user and the CPU performs the power-off control sequence. In response to this, information indicating that the own device cannot accept the distributed processing is notified by a predetermined method. Upon receiving this notification, the CPU of each information device deletes the information device to be powered off from the current list of information devices.

  In the image processing systems 100 and 100a, even when device information is exchanged at a fixed time interval, a difference from the actual state occurs due to a power failure or the like, and the distributed device is requested to perform a distributed process. May not be able to respond. Accordingly, by notifying other information devices that the distributed processing cannot be performed by the own device when the power is turned off, it is possible to prevent a situation in which a response cannot be made due to the power being turned off.

  The CPU of each information device described above is connected to the communication network NW after the power ON button on the operation panel of the own device is pressed by the user and the CPU performs the power ON control sequence. In response to this, information indicating that the own device can accept the distributed processing is notified by a predetermined method. Upon receiving this notification, the CPU of each information device adds the information device to be turned on to the current information device list.

  In the image processing systems 100 and 100a, even when device information is exchanged at regular time intervals, a difference from the actual state occurs due to power ON or the like, and it is not possible to request distributed processing to information devices that are powered ON. There is. Therefore, by notifying other information devices that the distributed processing can be performed by the own device when the power is turned on, it is possible to prevent a situation in which the distributed processing cannot be requested to the information devices that are powered on.

  In addition, when the CPU of each information device described above detects that its own device is connected to the communication network NW, it is determined in advance for each information device connected to the communication network NW. Notify information that the device can accept distributed processing. Upon receiving this notification, the CPU of each information device adds the information device connected to the communication network NW to the current information device list.

  In the image processing systems 100 and 100a, even when device information is exchanged at regular time intervals, there is a difference from the actual state in which the information device in the power-on state is connected to the communication network NW. There is a case where distributed processing cannot be requested to an information device connected to the communication network NW. Therefore, it is possible to prevent a situation in which the distributed processing cannot be requested to the information device connected to the communication network NW by notifying other information devices that the distributed processing can be performed by itself when connected to the communication network NW.

  In the distributed processing by the printer 107 and the MFP 101 described above, the MFP 101 having the maximum matrix size of 3 × 3 is requested to perform the distributed processing (see FIG. 9). When the distributed processing cannot be performed, the CPU of the information device such as the printer 107 may request the MFPs 102 and 103 having 5 × 5, which is the next larger matrix size than 3 × 3, to request the distributed processing.

  In the image processing systems 100 and 101a, the requested distributed processing may not be executed because the information device requesting the distributed processing is executing the distributed processing requested by another information device. Therefore, when distributed processing cannot be performed because there is no response to the request for a predetermined time, the next candidate (for example, the next largest matrix size) is requested to perform distributed processing. Thereby, in the image processing systems 100 and 100a, it is possible to reliably perform image processing even if the processing performance is somewhat deteriorated.

  Here, a detailed configuration of the information apparatus according to the image processing systems 100 and 100a will be described. Note that the main components (CPU, ROM, RAM, communication I / F unit, display unit, operation unit, image processing unit) in the MFP, personal computer, printer, and scanner are substantially the same. An MFP having both configurations will be described as an example.

  First, FIG. 11 shows the configuration of an MFP reader. As shown in FIG. 11, the reading device includes a reading device main body 1, a document conveying device 2, and a document reading table 3. Inside the reader main body 1, a first traveling body 4 including a light source 4a composed of a xenon lamp or a fluorescent lamp, a mirror 4b, a second traveling body 5 including mirrors 5a and 5b, An exposure scanning optical system 9 comprising a lens 6, a one-dimensional CCD 7 (three-line CCD for color reading in this embodiment), and a stepping motor 8 for driving the first traveling body 4 and the second traveling body 5 is provided. Is provided.

  The document feeder 2 is provided with an SDF unit 10 and a document table 11. In the SDF unit 10, a document transporting stepping motor 12 is provided. Further, a document pressing plate 14 is rotatably attached to the upper portion of the document reading table 3, and the document 13 is set under the document pressing plate 14. A reference white plate 15 for shading correction is disposed at the end of the document reading table 3.

  FIG. 12 is a block diagram showing the configuration of the MFPs 101, 102, 103, 104, 105, 106. Hereinafter, the MFP 101 will be described as an example.

  As shown in FIG. 12, the MFP 101 includes a light source 4a, a CCD 7, a CIS 44, a stepping motor 8, a document conveying motor driver 20, a stepping motor 12, a traveling body motor driver 28, a CPU 16, a light source driver 17, a CCD driving unit 18, and a reading signal. Processing unit 25, buffer memory controller 43a, buffer memory 43b, image processing unit 19, memory 27b, memory controller 27a, write signal processing unit 26a, LD 26b (LD: laser diode), LD drive unit 26c, ROM 16a, RAM 16b, communication An I / F unit 16c, a display unit 16d, and an operation unit 16e are provided.

  Here, the CPU 16 centrally controls the operation of the MFP 101 by sequentially executing the programs stored in the ROM 16a. The ROM 16a stores programs and various settings in advance. The RAM 16b is used as a work area for the CPU 16. Specifically, device information acquired via the communication network NW is temporarily stored. The communication I / F unit 16c is a communication interface for performing communication via the communication network NW. In the MFP 101, data communication such as device information and image data is performed by the communication I / F unit 16c. Further, when the communication I / F unit 16c detects connection to the communication network NW, the communication I / F unit 16c notifies the CPU 16 of the detection result. Thereby, CPU16 can start the process according to the connection to the communication network NW. The display unit 16d is a display device such as a liquid crystal display. The operation unit 16e is a touch panel or various operation buttons for receiving an operation instruction from the user, and the received operation instruction is output to the CPU 16. For example, various settings (high performance mode, normal mode, etc.), operation instructions such as power-off and power-on are output to the CPU 16.

[Description of Reading Operation of MFP 101]
A reading operation of the MFP 101 will be described. The MFP 101 has roughly two modes of reading operation. One is a pressure plate reading mode in which the original 13 is read on the original reading table 3 illustrated in FIG. 13, and the other is the original 13 placed on the original conveying device 2 illustrated in FIG. This is a see-through DF reading mode (document feeding reading mode) in which the document 13 itself is moved.

  As shown in FIG. 13, in the pressure plate reading mode, after setting the document 13 on the document reading table 3 below the document pressing plate 14, the CPU 16 operates the light source driver 17 to turn on the light source 4a. Next, the reference white plate 15 is scanned and read by the CCD 7 driven by the CCD driving unit 18, analog-to-digital conversion is performed by an A / D converter (not shown) in the image processing unit 19, and the read signal processing unit 25 The white reference data for shading correction is stored in the shading correction processing RAM (FIG. 16, line buffer white reference data 36) in the image processing unit 19. Next, the CPU 16 operates the stepping motor 8 via the document transport motor driver 20. As a result, the first traveling body 4 moves in a direction in which the document 13 is present. As the first traveling body 4 scans the document surface at a constant speed, the image data of the document 13 is photoelectrically converted by the CCD 7.

  As shown in FIG. 14, in the sheet-through DF reading mode, the first traveling body 4 is stopped at a fixed reading position, instead of reading the document 13 fixed on the document reading table 3 as in the pressure plate reading mode. The document 13 itself is moved and read. The CPU 16 first scans the reference white plate by scanning the reference white plate 15 with a certain amount of movement in the same manner as in the pressure plate reading mode, reads the reference white plate 15, and then first travels to a predetermined reading position (sheet through document reading position). The body 4 is moved and stopped. Next, the CPU 16 drives the stepping motor 12 via the traveling body motor driver 28 in order to convey the document 13. The document 13 set on the document table 11 is conveyed to a sheet-through document reading position by a separation roller 29 and a conveyance roller 30. At this time, the document 13 is conveyed at a constant speed, and the surface of the document is photoelectrically converted by the CCD 7 while the first traveling body 4 is stopped.

  The above-described sheet-through DF reading mode is for reading a single-sided original. When reading a double-sided document, the back side of the document 13 is read when the document 13 passes the conveyance roller 30 and then passes the CIS 44.

[Description of Read Signal Processing of MFP 101]
Details of the read signal processing unit 25, which is read signal processing of the MFP 101, will be described. FIG. 15 is a block diagram illustrating a configuration relating to reading processing. As shown in FIG. 15, the read signal processing unit 25 includes an analog video processing unit 21 and a shading correction processing unit 22. An analog video signal photoelectrically converted is input to the analog video processing unit 21. The analog video signal is subjected to digital conversion processing by the analog video processing unit 21, and then shading correction as correction processing of the reading device is performed by the shading correction processing unit 22.

  FIG. 16 is a block diagram illustrating the configuration of the analog video processing unit 21 and the shading correction processing unit 22. As shown in FIG. 16, the analog video processing unit 21 includes a preamplifier circuit 31, a variable amplifier circuit 32, and an A / D converter 33. The shading correction processing unit 22 includes a black subtraction circuit 34, a shading correction calculation circuit 35, and line buffer white reference data 36. The line buffer white reference data 36 holds the above-described white reference data that is used as a reference in shading correction.

  The reflected light irradiated from the light source 4 a on the document 13 on the document reading table 3 is condensed by the lens 6 through the shading adjustment plate 37 and is imaged on the CCD 7. The shading adjustment plate 37 plays a role of adjusting the amount of light for reducing the difference in the amount of reflected light between the central portion and the end portion of the CCD 7. This is because if the difference in the amount of reflected light between the central portion and the end portion of the CCD 7 is too large, the shading correction processing unit 22 can only obtain a calculation result including distortion, so shading is performed after reducing the difference in the reflected light amount in advance. This is for performing correction calculation processing. In FIG. 16, a mirror for folding the reflected light is omitted for the sake of simplicity.

  As shown in FIG. 15, the image data after the read signal processing by the read signal processing unit 25 is temporarily held in the buffer memory 43b via the buffer memory controller 43a. The buffer memory controller 43a simultaneously receives the image data of the front surface sent from the CCD 7 and the image data of the back surface sent from the CIS 44, and holds the image data for two pages in the buffer memory 43b. Thereafter, the buffer memory controller 43a alternately outputs the image data on the front surface and the image data on the back surface to the image processing unit 19 as one page of image data. The image processing unit 19 performs various image processes for each image of one page output from the buffer memory controller 43a. Note that the image data from the CIS 44 is image data that has already undergone processing equivalent to the processing performed by the read signal processing unit 25 on the image from the CCD 7, and therefore analog video processing and shading correction processing are not performed. It is unnecessary.

[Description of Image Processing of MFP 101]
FIG. 17 is a block diagram illustrating a configuration of the image processing unit 19. As shown in FIG. 17, the image processing unit 19 performs the pre-stage image processing (see FIG. 6) by the pre-stage image processing unit 40a and the post-stage image processing (see FIG. 7) by the post-stage image processing unit 40b.

  As shown in FIG. 6, the pre-stage image processing unit 40a includes an interline correction processing unit 41a, an image area separation processing unit 41b, a side magnification processing unit 41c, a γ conversion processing unit 41d, a filter processing unit 41e, and a color conversion processing unit 41f. Process by. The inter-line correction processing unit 41a corrects the line shift between RGB, which is caused by the difference in the attachment positions of the RGB of the CCD 7. For example, when a B (blue) line is used as a reference, a process of correcting a line shift amount between R (red) and B, and G (green) and B is performed.

  The image area separation processing unit 41b generates image area separation information such as a picture part, a character part, and a halftone part from the characteristics of the image data. The side magnification processing unit 41c performs processing for converting the reading resolution to a desired resolution. The γ conversion processing unit 41d performs conversion mainly for the purpose of density adjustment (for example, density adjustment as shown in FIG. 18). As an example, the γ conversion processing unit 41d performs the above-described conversion using a method called lookup table conversion as shown in FIG.

  The filter processing unit 41e performs filter processing calculations for the purpose of MTF correction, sharpening, and smoothing. The color conversion processing unit 41f performs conversion processing to a common color space for storage in the memory 27b. When automatic color determination is selected, K (monochrome) data is generated from RGB data. This monochrome data is simply binarized and packed as 8-pixel data into 8-bit data. RGBK 4ch image data is transferred to the memory controller 27a. In normal color data reading, RGB 3ch image data is transferred. In addition, when there is an application such as a PDF file that requires separation information, RGB data and 4ch data of image area separation information are transferred to the controller.

  As shown in FIG. 7, the post-stage image processing unit 40b performs processing by the color conversion processing unit 42b and the gradation conversion processing unit 42c. The color conversion processing unit 42b performs processing for converting the stored data RGB as input data into a color space of the output device, for example, a CMYK color space. In the case of color output, the above processing is performed on each RGB component, and in the case of monochrome output, monochrome data is generated from RGB.

Here, gradation conversion by binarization of a fixed threshold when the writing device can output up to 1 bit and 2 gradations will be described. When a binary image is desired, the gradation conversion processing unit 42c converts each 8-bit, 256-gradation CMYK image into binary gradation-level binary image data and sends it to the subsequent stage. Here, in order to simplify the explanation, an example of the fixed threshold value processing is described. When the binarization threshold value is 128, the pixel data of the input image is binarized under the following conditions.
0 ≦ pixel data <0 if 128 is true
128 ≤ Pixel data ≤ 1 if 255 is true

Next, gradation conversion by fixed threshold quaternization when the writing device can output up to 2 bits and 4 values will be described. When a quaternary image is desired, the gradation conversion processing unit 42c converts CMYK 8-bit and 256-gradation images into 4-gradation quaternary image data and sends them to the subsequent stage. Here, in order to simplify the description, as an example of the fixed threshold processing, a case where quaternarization is performed under the following conditions is shown.
0 ≤ pixel data <0 if 64 is true
64 ≤ pixel data <1 if 128 is true
128 ≤ pixel data <2 if 192 is true
192 ≦ Pixel data ≦ 3 if 255 is true

  In addition to the above-described simple binarization, although not described here, gradation conversion processing such as error diffusion processing and dither processing excellent in gradation properties suitable for a photographic document may be performed.

  Note that the program executed by the information device of the present embodiment is provided by being incorporated in advance in a ROM or the like. A program executed by the information device of the present embodiment is an installable or executable file and is read by a computer such as a CD-ROM, a flexible disk (FD), a CD-R, a DVD (Digital Versatile Disk). It is recorded on a possible recording medium and provided as a computer program product.

  Furthermore, the program executed by the information device of this embodiment may be configured to be stored by being stored on a computer connected to a network such as the Internet and downloaded via the network. Further, the program executed by the information device of the present embodiment may be configured to be provided or distributed via a network such as the Internet.

100, 100a Image processing system 16 CPU
16a ROM
16b RAM
16c Communication I / F unit 16d Display unit 16e Operation unit 19 Image processing unit 27a Memory controller 27b Memory 40a Pre-stage image processing unit 40b Post-stage image processing unit 41a Inter-line correction processing unit 41b Image area separation processing unit 41c Side magnification processing unit 41d γ Conversion processor 41e Filter processor 41f Color conversion processor 42b Color conversion processor 42c Tone conversion processor 43a Buffer memory controller 43b Buffer memories 101 to 106 MFP
107 Printer 108 Scanner 109 Personal Computer NW Communication Network

JP 2003-60832 A JP 2007-221325 A

Claims (10)

Communication means;
From another image processing apparatus connected via the communication unit, a filter processing the other image processing apparatus is performed, device information indicating the index of the image quality performance, the filters in the processing capability of the filtering Obtaining means for obtaining
Storage means for holding correspondence between the acquired index and the other image processing apparatus from which the index is obtained;
An operation means for receiving an operation instruction from a user;
Image processing means for performing image processing instructed by the operation means for each unit image processing that is a minimum unit of the instructed image processing;
When a filter process related to an image process including a processing result is instructed by the operation unit, the instructed filter process is automatically performed with the index corresponding to the other image processing apparatus held in the storage unit. Based on the image quality performance index of the filter of the apparatus, distributed processing means to be distributed to the image processing apparatus that satisfies the conditions derived from the processing results,
An image processing apparatus comprising: The acquisition means acquires a matrix size according to the filtering process as the index,
The storage means stores the acquired matrix size as the index,
The distributed processing means, based on the matrix size corresponding to the other image processing apparatus held in the storage means, and the matrix size of the own apparatus, for the filtering processing related to the instructed image processing, Distributed to image processing devices in which the generation of moire is suppressed by the number of halftone lines of the image designated as the processing result;
The image processing apparatus according to claim 1. Communication means;
From another image processing apparatus connected via the communication unit, a filter processing the other image processing apparatus is performed, device information indicating the index of the image quality performance, the filters in the processing capability of the filtering Obtaining means for obtaining
Storage means for holding correspondence between the acquired index and the other image processing apparatus from which the index is obtained;
An operation means for receiving an operation instruction from a user;
Image processing means for performing image processing instructed by the operation means for each unit image processing related to the instructed image processing;
When the filter means related to the image processing before the output by the output device including the processing result is instructed by the operation means , the filter processing related to the image processing before the output by the output device is held in the storage means. Based on the index corresponding to the other image processing apparatus and the index of the image quality performance of the filter of its own apparatus, it is distributed to the image processing apparatuses that satisfy the condition derived from the processing result. Distributed processing means;
An image processing apparatus comprising: The acquisition means acquires a matrix size according to the filtering process as the index,
The storage means stores the acquired matrix size as the index,
When the distribution processing unit is instructed to perform smoothing as the processing result, the filter processing for the instructed image processing is performed with a matrix size corresponding to the other image processing apparatus held in the storage unit. , Based on the matrix size of the device itself, to be distributed to the image processing device with the smoothing coefficient for the instructed smoothing,
The image processing apparatus according to claim 3. The acquisition means acquires a matrix size according to the filtering process as the index,
The storage means stores the acquired matrix size as the index,
When the sharpening is instructed as the processing result, the dispersion processing means has a matrix size corresponding to the other image processing apparatus held in the storage means for the filter processing related to the instructed image processing. , Based on the matrix size of the own device, to be distributed to the image processing device with the instructed sharpening coefficient for the sharpening,
The image processing apparatus according to claim 3. The acquisition means acquires the device information from the other image processing apparatus at predetermined time intervals set in advance;
The image processing apparatus according to claim 1, wherein: When the operation unit instructs to turn off its own device, the information processing unit further includes notification means for notifying the other image processing apparatus of information indicating that the image processing from the other image processing apparatus cannot be accepted. about,
The image processing apparatus according to claim 1, wherein: And a notification means for notifying the other image processing apparatus of information indicating that the image processing from the other image processing apparatus can be accepted when the operation means instructs to power on the own apparatus. ,
The image processing apparatus according to claim 1, wherein: Detecting means for detecting connection to a communication network by the communication means;
Further comprising distribution means for distributing information indicating that the device can accept image processing to the communication network when connection to the communication network is detected;
The image processing apparatus according to claim 1, wherein: When the distributed processing unit fails to cause unit image processing to be performed by being distributed to any of the image processing apparatuses that satisfy the condition derived from the processing result, the other image processing apparatus that satisfies the condition To perform unit image processing in a distributed manner,
The image processing apparatus according to any one of claims 1 to 9.

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