JP3880269B2 - Image forming system and control method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an image forming system and a control method therefor, and more particularly to an image forming system and a control method therefor that form a faithful image based on image data on a recording medium.
[0002]
[Prior art]
In recent years, with the improvement of the performance of color image reading devices (scanners) and color printers, for specific originals that are subject to duplication, such as banknotes and securities, by reading the originals with a color scanner and outputting them to a color printer, There is a growing risk of being counterfeited.
[0003]
In order to prevent such forgery, for example, in a color copying machine that is a combination of a color scanner and a color printer, an anti-counterfeiting device that recognizes whether or not a document to be processed is a specific document and performs a copy inhibition process Are increasingly being incorporated.
[0004]
However, since the anti-counterfeiting device used in the color copying machine operates only at the time of copying, the copy-prohibited document is read once by a scanner or the like, and the obtained image data is output by a color printer. There was a possibility of counterfeiting. In general, the conventional anti-counterfeiting apparatus is expensive, so that it is difficult to mount it on a small and inexpensive color copying machine or printer.
[0005]
On the other hand, so-called digital watermarking technology for embedding copyright information in digital contents such as images and music is being put into practical use. Therefore, it has been proposed to apply this digital watermark technology to the forgery prevention device as described above. For example, forgery can be prevented by embedding information by electronic watermark in advance in a printed matter (specific original) that is prohibited from copying, and detecting the electronic watermark information at the time of copying or printing the printed matter.
[0006]
[Problems to be solved by the invention]
However, when the forgery determination process using the digital watermark as described above is executed in the printer driver, an excessive load is applied to the CPU of the host computer. Therefore, there is a drawback that the printing speed in the apparatus is remarkably reduced by executing the forgery determination process.
[0007]
The present invention has been made to solve the above-described problems, and provides an image forming system and a control method thereof capable of realizing high-speed printing by reducing the load of forgery determination processing in a printer driver. Objective.
[0008]
[Means for Solving the Problems]
As a technique for achieving the above object, a method for controlling an image forming system according to the present invention includes the following steps. That is, generate image data Computer And a control method of an image forming system in which a visible image based on the image data is formed on a recording medium. Printer driver in computer Input process for inputting print information and image data indicated by the input print information Resolution Is the predetermined resolution Over Resolution determination step for determining whether or not, An image size determination step for determining whether the size of an output image based on the input print information exceeds a predetermined size, and detection for detecting whether digital watermark information indicating that copying is prohibited is embedded in the image data Process, and detection In the process, the image data Detects that the watermark information is embedded in If Prevent faithful reproduction of the input print information Execute the process Reproduction prevention Processing process When the resolution determination step determines that the resolution of the image data is equal to or less than the predetermined resolution, or the image size determination step determines that the size of the output image is equal to or less than the predetermined size, the detection step Skip It is characterized by that.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment according to the present invention will be described in detail with reference to the drawings.
[0010]
<First Embodiment>
FIG. 1 is a diagram showing an overall configuration of a printing system using a color laser beam printer to which the present embodiment is applied.
[0011]
In the figure, reference numeral 200 denotes a host computer that outputs print information including print data and control codes to the printer 100 via the I / F 203. The host computer 200 is configured as a computer system including a keyboard 210 that is an input device, a mouse 211 that is a pointing device, and a display monitor 220 that is a display device. Further, it is possible to input image data obtained by connecting a scanner 300 and optically reading a document image. It is assumed that the host computer 200 is operated by a basic OS such as Windows NT (trademark of Microsoft Corporation), Windows 95 (98) (same as above).
[0012]
On the host computer 200 side, attention is paid only to the functional part related to the present embodiment, and the functions on the basic OS are roughly classified into application software 201 and graphic subsystem 202.
[0013]
The application software 201 indicates application software that operates on basic software such as a word processor or spreadsheet.
[0014]
As shown in FIG. 2, the graphics subsystem 202 includes a graphic device interface (hereinafter referred to as GDI) 2021 that is a part of the functions of the basic OS and a printer that is a device driver dynamically linked from the GDI 2021. The driver 2020 is configured.
[0015]
The printer driver 2020 is called from the GDI 2021 via an interface called DDI (Device Driver Interface), and performs processing corresponding to the device for each drawing object. The processing system of the printer driver 2020 can be roughly divided into two types, a PDL mode type 2023 and an image mode type 2024, and one of the above is selected by the selector 2022 according to input data.
[0016]
Here, the PDL mode type corresponds to a printer equipped with a controller capable of processing a control command called PDL (Printer Description Language), and the printer driver 2020 uses the PDL command to print information passed from the system via the DDI. As soon as it is converted to, it is sent to the printer 100 via the GDI 2028.
[0017]
Since the process of the printer driver 2020 in the PDL mode type only generates a command from the data received by the DDI, it can be said that the process is light for the driver.
[0018]
As a feature of the PDL mode type, if the printer 100 has a high ability to analyze a PDL command, the printer driver 2020 can receive high-level data from the GDI 2021 and send it to the printer 100 as it is. The data size to be transferred can be small regardless of the resolution and output gradation.
[0019]
However, in the PDL mode type, when drawing a graphic with gradation or the like in a graphics application or outputting a high resolution / high gradation image, a large print command is generated, so the processing speed is extremely high. Often slow.
[0020]
On the other hand, with the image mode type, a print image is developed in a memory space secured on the printer driver 2020 side so that it is not necessary to perform advanced drawing processing on the printer 100 side, and the print image is directly printed on the printer 100. After being converted into a form that can be performed, it is sent to the printer 100 for printing.
[0021]
As the processing of the printer driver 2020 in the image mode type, similarly to the PDL mode type, the image mode printer driver 2024 performs drawing processing on the band memory 2027 using print information input from the GDI 2021 via the DDI. The bitmap data generated on the band memory 2027 is sent to the printer 100 via the GDI 2028.
[0022]
A feature of the image mode type is that high-resolution color images and complex graphics data can be drawn at high speed. On the other hand, even when drawing characters or simple figures, image data of the entire drawing area is generated with the output resolution and output gradation and sent as a print command. For high-speed printing, the processing time is rather increased.
[0023]
Hereinafter, forgery determination processing in the printer driver 2020 will be described with the PDL mode type processing system as the PDL driver 2023 and the image mode type processing system as the image driver 2024, respectively.
[0024]
The PDL driver 2023 and the image driver 2024 include forgery determination units 2025 and 2026, respectively, and digital watermark information embedded in advance for image data satisfying a predetermined resolution condition among print information received from the DDI. Forgery determination processing is performed by detecting.
[0025]
The print information has three types of attributes: “text” that is font information, “graphics” that consists of graphic vectors and gradation information, and “image” that is a read image of a photo. Different functions are used. Further, since the data of the “image” attribute includes information such as the number of pixels in the vertical and horizontal directions and the output image size, only the data of the “image” attribute satisfying the above resolution condition when the print information is received from the DDI. It is easy to extract and process.
[0026]
Hereinafter, the forgery determination process in the forgery determination unit 2026 in the PDL driver 2023 will be described with reference to the flowchart shown in FIG. The forgery determination process in the forgery determination unit 2026 in the image driver 2024 is the same as that of the PDL driver 2023 except that the bitmap data is generated on the printer driver 2020 side. .
[0027]
In FIG. 3, the print information is first input in step S301. The print information includes not only image data created by the application 201 but also image data obtained by reading a document by the scanner 300 or image data stored in advance in a storage medium such as a hard disk (not shown). May be. In step S302, it is determined whether the input print information is image data that satisfies a predetermined resolution condition.
[0028]
Generally, when copying banknotes, securities, etc., image data to be processed has a resolution of a certain level or more in order to faithfully reproduce a document image read by the scanner 300 or the like. Therefore, the resolution condition may be set to a level at which the print output cannot be sufficiently precise as a counterfeit of banknotes or securities. Specifically, if the data resolution at the time of output is 100 dpi (dots / inch) or less, it can be said that the output image quality is insufficient as a counterfeit. Therefore, image data of 100 dpi or less is unlikely to be forged data. Therefore, in the present embodiment, 100 dpi is set as the resolution condition.
[0029]
In step S302, if the input print information is image data having an output resolution of 100 dpi or less, the process proceeds to step S306, and the PDL driver 2023 converts the print information into a PDL command as usual and ends the process.
[0030]
On the other hand, if the input print information is image data exceeding the output resolution of 100 dpi, the process advances to step S303 to perform digital watermark detection processing.
[0031]
Hereinafter, the digital watermark detection process in step S303 will be described. In the present embodiment, if specific digital watermark information indicating copy prohibition is detected for input image data exceeding 100 dpi, the image data is based on a specific document and may be forged. to decide. Hereinafter, a method for extracting digital watermark information in the present embodiment will be described. However, the present invention is not particularly limited to this method, and a known extraction method can be applied.
[0032]
First, input image data is divided into blocks, and Fourier transform is performed for each block to extract frequency components. The obtained frequency domain image data is separated into an amplitude spectrum and a phase spectrum, and a registration signal included in the amplitude spectrum is detected.
[0033]
In general, according to human visual characteristics, embedding a signal in a low-frequency component is more easily recognized as noise than embedding a signal in a high-frequency component. In addition, irreversible compression such as JPEG has a low-pass filter effect, and is characterized by removing high-frequency components by performing compression / decompression processing using JPEG.
[0034]
The registration signal is not more than a first frequency level that is difficult for humans to see, based on the characteristics of these high-frequency components and low-frequency components, and is not less than a second frequency level that is not removed by lossy compression and expansion. Embedded as an impulse signal to an intermediate level frequency. Therefore, a registration signal is detected by extracting an impulse signal in the frequency domain at the intermediate level included in the amplitude spectrum.
[0035]
Then, the scaling rate of the digital image data is calculated based on the coordinates of the extracted registration signal (impulse signal).
[0036]
The digital watermark extraction unit 301 recognizes in advance in which frequency component of the detection target image that is not scaled, the ratio of this frequency and the frequency at which the impulse signal is detected. Thus, the scaling rate can be calculated.
[0037]
For example, if the frequency recognized in advance is a and the frequency of the detected impulse signal is b, it can be seen that a / b scaling is performed. This is a property in the well-known Fourier transform.
[0038]
By determining the size of the pattern for detecting the digital watermark information included in the image data based on the scaling rate and performing the convolution using the pattern, the digital watermark information can be detected.
[0039]
As a result of the digital watermark detection process (S303) described above, if digital watermark information indicating copy prohibition is not detected (S304), the PDL driver 2023 performs a normal PDL command conversion process in step S306. In this case, since it is image data, command conversion is performed by adding predetermined header information.
[0040]
On the other hand, when the electronic watermark information subject to copy prohibition is detected, the PDL driver 2023 executes the forgery prevention process in step S305.
[0041]
Hereinafter, the forgery prevention process according to the present embodiment will be described with reference to a flowchart shown in FIG.
[0042]
First, in step S401, the PDL driver 2023 notifies the OS that duplication prohibition data is included, and the OS that receives this displays a warning dialog as shown in FIG. Thus, it is notified that this process may be counterfeit, that is, a crime.
[0043]
In step S402, if the user selects “No” (= printing cancel) in response to the warning dialog, in step S404, the PDL driver 2023 cancels the printing operation of the data and ends the processing.
[0044]
On the other hand, if the user selects “Yes” (= continue printing) in response to the warning dialog, the operation history is stored in a hard disk device (not shown) in the host computer 200 and the image portion is blacked out. Is performed (S403), and the forgery prevention processing routine (S305) is terminated. It should be noted that the painting of the image part is merely an example of anti-counterfeiting processing, and any image processing that degrades the image quality of the image data, that is, processing that prevents faithful reproduction of the input image may be used. You may perform an appropriate process.
[0045]
When the printing operation is not stopped by the above-described series of processing, the print information output from the PDL driver 2023 is input to the printer 100 illustrated in FIG. 1 via the host I / F 111.
[0046]
The printer 100 analyzes print information input from the host computer 200 and generates a print image (bitmap image data), and receives the print image, and a formatter control unit 110 that controls the entire printer 100. The printer engine 140 for forming a visible image on recording paper is roughly classified.
[0047]
The formatter control unit 110 is connected to an operation panel unit 120 in which switches for user operations and printer status notifications, LED indicators, and the like are arranged. The operation panel unit 120 is disposed as a part of the exterior of the printer 100.
[0048]
Next, the formatter control unit 110 in the printer 100 will be described with reference to FIG.
[0049]
The formatter control unit 110 is a part generally called a PDL controller or the like, and a host interface (I / F) 111 that is a connection means with the host computer 200, and a storage for temporarily holding and managing received data and the like. A reception buffer 1121, which is a means, a transmission buffer 1122, which is a storage means for temporarily holding and managing transmission data, a command analysis unit 113 for managing print data, a print control unit 114, a drawing processing unit 115, a page memory 116, and the like.
[0050]
The host interface 111 is a communication unit that transmits and receives print data to and from the host computer 200, and enables communication conforming to IEEE-1284 as a communication protocol. However, the present invention is not limited to this communication protocol, and connection by various protocols may be possible via a network, or communication means based on IEEE-1394, USB, or the like may be used.
[0051]
The print data received via the host interface 111 is sequentially accumulated in the reception buffer 1121, and is read out and processed by the command analysis unit 113 or the drawing processing unit 115 as necessary.
[0052]
The command analysis unit 113 is configured by a control program according to each PDL command system and print job control language, and instructs the drawing processing unit 115 based on the analysis result of print data related to drawing such as character printing, graphics, and images. For commands other than drawing, such as paper feed selection and reset command, the print control unit 114 is instructed to perform processing.
[0053]
The drawing processing unit 115 has a function as a renderer that sequentially develops each drawing object of characters and images in the page memory 116. The output control unit 130 converts the contents of the page memory 116 into a video signal, and transfers the video signal VDO to the printer engine 140 via the video I / F 150.
[0054]
The printer engine 140 is a printing mechanism unit for forming a received video signal as a permanent visible image on a recording sheet. Hereinafter, the configuration of the printer engine 140 is shown in FIG. 7 and its operation will be described.
[0055]
In FIG. 7, the paper P fed from the paper feed cassette 161 is held by the outer periphery of the transfer drum 154 with its leading end held between grippers 154 f. The latent image of each color formed on the photosensitive drum 151 by the optical unit 170 is developed by each color developing device Dy, Dm, Dc, Db of yellow (Y), magenta (M), cyan (C), and black (B). And is transferred a plurality of times to the paper on the outer periphery of the transfer drum to form a multicolor image. Thereafter, the paper P is separated from the transfer drum 154, fixed by the fixing unit 155, and discharged from the paper discharge unit 159 to the paper discharge tray unit 160.
[0056]
Here, the developing devices Dy, Dm, Dc, and Db of the respective colors have rotation support shafts at both ends, and are held by the developing device selection mechanism unit 152 so as to be rotatable around the shafts. As a result, as shown in FIG. 7, the developing devices Dy, Dc, Db, and Dn maintain their postures even when the developing device selection mechanism 152 rotates around the rotation shaft 152a for selecting the developing device. It has a configuration that can be maintained.
[0057]
After the selected developing device moves to the developing position, the developing device selection mechanism 152 is integrated with the developing device, the selection mechanism holding frame 153 is pulled in the direction of the photosensitive drum 151 by the solenoid 153a around the fulcrum 153b, and the photosensitive drum The developing process is performed by moving in the 151 direction.
[0058]
Next, the charging drum 156 uniformly charges the photosensitive drum 151 to a predetermined polarity. The image data VDO developed as a print image in the formatter control unit 110 is converted into a video signal having a corresponding pattern and output to the laser driver to drive the semiconductor laser 141.
[0059]
In accordance with the input video signal VDO, the laser light emitted from the semiconductor laser 141 is controlled to be turned on and off, and further swung left and right by the polygon mirror 142 that rotates at high speed by the scanner motor 143, and the polygon lens 134 and the reflecting mirror 144 are moved. Then, scanning exposure is performed on the photosensitive drum 151. As a result, an electrostatic latent image having an image pattern is formed on the photosensitive drum 151.
[0060]
Next, for example, an M (magenta) electrostatic latent image is developed by an M (magenta) developer Dm, and an M (magenta) first toner image is formed on the photosensitive drum 151. .
[0061]
On the other hand, the transfer paper P is fed at a predetermined timing, a transfer bias voltage having a polarity opposite to that of the toner (for example, plus polarity) is applied to the transfer drum 154, and the first toner image on the photosensitive drum 151 is applied to the transfer paper P. While being transferred, the transfer paper P is electrostatically attracted to the surface of the transfer drum 154. Thereafter, the remaining M (magenta) toner is removed from the photosensitive drum 151 by the cleaner 157 to prepare for the next color latent image formation and development process.
[0062]
Thereafter, the toner images of the second, third, and fourth colors are transferred in the order of C (cyan), Y (yellow), and Bk (black) by the same procedure. However, a difference is that a bias voltage higher than that of the previous time is applied to the transfer drum 154 during the transfer of each color.
[0063]
When the leading edge of the transfer paper P onto which the four-color toner images are superimposed and transferred approaches the separation position, the separation claw 158 approaches and the leading edge contacts the surface of the transfer drum 154, and the transfer paper P is removed from the transfer drum 154. Separate. The separated transfer paper P is conveyed to the fixing unit 155 where the toner image on the transfer paper is fixed and discharged onto the paper discharge tray 160. The printer engine 140 according to the present embodiment can output an image with a resolution up to 600 dots / inch (dpi) through the image forming process as described above.
As described above, according to the present embodiment, the printer driver 2020 performs digital watermark detection processing only on image data exceeding a predetermined resolution. As a result, it is possible to suppress the execution of the digital watermark detection process to the minimum necessary, and thus it is possible to realize a function for preventing counterfeiting of banknotes and securities while suppressing a decrease in overall throughput.
[0064]
In the present embodiment, an example in which the present invention is applied to a color laser beam printer has been described. However, printers to which the present invention can be applied are not limited to color laser beam printers, such as inkjet printers and thermal printers. Of course, other color printers may be used.
[0065]
Further, in the present embodiment, the description has been given assuming that the resolution, which is a determination criterion of whether to perform the digital watermark detection process, that is, whether to perform the forgery determination process, is 100 dpi. Generally, the resolution of data that is frequently sent, for example, when printing out an image on the Internet is 100 dpi or less, so that forgery determination processing is not performed on image data of 100 dpi or less as in this embodiment. It is effective for shortening the processing time. Of course, applying other resolutions as judgment criteria for the forgery judgment process does not change the gist of the present invention.
[0066]
<Modification>
In the above-described embodiment, the example in which the forgery determination process is executed according to whether the output resolution exceeds a predetermined value has been described. However, in addition to the output resolution, the output image size is further added to the determination criterion. Is possible.
[0067]
For example, even if the output resolution is high, if the size of the output image is small, the printed matter based on the image data cannot be used as a counterfeit, so if the output image size is a predetermined value or less (for example, within 5 cm x 5 cm). , Control to skip the forgery determination process.
[0068]
In this way, in addition to the determination criterion of a predetermined resolution or less, the processing time can be further shortened by not performing the forgery determination process for data of a predetermined size or less.
[0069]
Of course, the execution determination criterion of the forgery determination process is not limited to this example, and if the set output parameter is set so that the output image is not accepted as a forgery if printing is performed as it is, the forgery determination process is performed. It can be adopted as a criterion for determining whether or not to perform.
[0070]
[Other Embodiments]
Note that the present invention can be applied to a system including a plurality of devices (for example, a host computer, an interface device, a reader, and a printer), and a device (for example, a copying machine and a facsimile device) including a single device. You may apply to.
[0071]
Another object of the present invention is to supply a storage medium (or recording medium) in which a program code of software that realizes the functions of the above-described embodiments is recorded to a system or apparatus, and the computer (or CPU or CPU) of the system or apparatus. Needless to say, this can also be achieved by the MPU) reading and executing the program code stored in the storage medium. In this case, the program code itself read from the storage medium realizes the functions of the above-described embodiment, and the storage medium storing the program code constitutes the present invention. Further, by executing the program code read by the computer, not only the functions of the above-described embodiments are realized, but also an operating system (OS) running on the computer based on the instruction of the program code. It goes without saying that a case where the function of the above-described embodiment is realized by performing part or all of the actual processing and the processing is included.
[0072]
Furthermore, after the program code read from the storage medium is written into a memory provided in a function expansion card inserted into the computer or a function expansion unit connected to the computer, the function is determined based on the instruction of the program code. It goes without saying that the CPU or the like provided in the expansion card or the function expansion unit performs part or all of the actual processing and the functions of the above-described embodiments are realized by the processing.
[0073]
【The invention's effect】
As described above, according to the present invention, it is possible to perform high-speed printing by reducing the load of forgery determination processing in the printer driver.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating an overall configuration of a printing system according to an embodiment of the present invention.
FIG. 2 is a block diagram showing a configuration of a graphic subsystem.
FIG. 3 is a flowchart showing forgery determination processing;
FIG. 4 is a flowchart showing forgery prevention processing;
FIG. 5 is a diagram illustrating an example of a warning dialog for a user.
FIG. 6 is a block diagram illustrating a configuration of a formatter control unit.
FIG. 7 is a cross-sectional view of the printer engine.
[Explanation of symbols]
100 printer
110 Formatter Control Unit
120 Operation panel
130 Output controller
140 Printer Engine
200 Host computer
201 Application
202 Graphics subsystem
2020 Printer driver
2021, 2028 GDI
2022 selector
2023 PDL driver
2024 image driver
2025, 2026 Counterfeit determination unit
2027 band memory

Claims (8)

A control method of an image forming system in which a computer that generates image data and an image forming apparatus that forms a visible image based on the image data on a recording medium are connected,
In the printer driver in the computer ,
An input process for inputting print information;
A resolution determination step for determining whether the resolution of the image data indicated by the input print information exceeds a predetermined resolution;
An image size determination step for determining whether the size of the output image by the input print information exceeds a predetermined size;
A detection step of detecting whether digital watermark information indicating prohibition of copying is embedded in the image data ;
In the detection step, when it is detected that the digital watermark information is embedded in the image data , a reproduction prevention processing step for executing processing for preventing faithful reproduction of the input print information ;
I have a,
When the resolution determination step determines that the resolution of the image data is less than or equal to the predetermined resolution, or the image size determination step determines that the size of the output image is less than or equal to the predetermined size, the detection step is skipped. A method for controlling an image forming system. 2. The method of controlling an image forming system according to claim 1, wherein in the resolution determination step, it is determined whether or not the resolution of the image data indicated by the print information is image data exceeding a predetermined resolution.   2. The image forming system control method according to claim 1, wherein in the input step, a print command from an application program is input. The reproduction prevention process your Keru the process, the control method according to claim 1, wherein the image forming system, characterized in that the processing of displaying a warning message to the user. The Contact Keru the processing in reproduction prevention process, the control method according to claim 1, wherein the image forming system, wherein the is a process that holds the history of the operation related to the image data. An image forming system in which a computer that generates image data and an image forming apparatus that forms a visible image based on the image data on a recording medium are connected,
The printer driver in the computer is
Determining whether the resolution of the image data indicated by the input print information exceeds a predetermined resolution;
Determining whether the size of the output image by the input print information exceeds a predetermined size;
Detecting whether or not digital watermark information indicating prohibition of copying is embedded in the image data ;
When it is detected that the digital watermark information is embedded in the image data , a process for preventing faithful reproduction of the input print information is executed .
The image forming is characterized in that the detection is not performed when it is determined that the resolution of the image data is equal to or lower than the predetermined resolution, or the size of the output image is equal to or smaller than the predetermined size. system. Input means for inputting image data;
Detecting means for detecting whether or not digital watermark information indicating prohibition of copying is embedded in the image data ;
Image processing means for executing processing for preventing faithful reproduction of the input print information when it is detected that the digital watermark information is embedded in the image data;
I have a,
The detection means includes
The image processing is characterized in that the detection is not performed when it is determined that the resolution of the image data is equal to or less than the predetermined resolution, or the size of the output image is equal to or less than the predetermined size. apparatus. In an image processing apparatus that generates image data,
A recording medium recording a program for controlling an image forming apparatus that forms a visible image on a recording medium based on the image data, the program being at least
An input process code for entering print information;
A code for a resolution determination step for determining whether the resolution of the image data indicated by the input print information exceeds a predetermined resolution;
A code of an image size determination step for determining whether the size of the output image according to the input print information exceeds a predetermined size;
A code of a detection step for detecting whether or not digital watermark information indicating prohibition of copying is embedded in the image data ;
In the detection step, when it is detected that the digital watermark information is embedded in the image data , a code of a reproduction prevention processing step for executing processing for preventing faithful reproduction of the input print information ;
I have a,
When the resolution determination step determines that the resolution of the image data is less than or equal to the predetermined resolution, or the image size determination step determines that the size of the output image is less than or equal to the predetermined size, the detection step is skipped. A recording medium further comprising:

Images