JP7263892B2 - IMAGE FORMING APPARATUS, PRINT SETTING CHANGE METHOD AND PRINT SETTING CHANGE PROGRAM - Google Patents

Description

The present invention relates to an image forming apparatus, a print setting change method, and a print setting change program.

2. Description of the Related Art Conventionally, there is known an image forming apparatus that determines a feature amount of input image data and changes print settings according to the feature amount. Such an image forming apparatus can avoid setting printing conditions every time an image having a feature amount similar to that of an image printed in the past is printed.

For example, the configuration described in Japanese Patent Application Laid-Open No. 2002-200000 acquires a printing condition parameter similar to the calculation result of the feature amount of the input image data, and performs print processing using the printing condition parameter. Further, in the configuration described in Patent Document 2, when the calculation result of the feature amount of the input image data satisfies a specific condition, image processing is performed according to the condition, and when the calculation result does not satisfy the specific condition, A condition according to the calculation result is added to the specific condition.

JP-A-2006-185321 JP 2005-079940 A

By the way, when the input image data is an image having periodic repetition, such as an image in which the same pattern is repeated a plurality of times, or an image having a predetermined periodic function curve, printing conditions suitable for the image are required. Must be set. Specifically, when an apparatus that forms an image with a recording head having a plurality of recording elements prints an image with periodicity, image defects such as streaks, unevenness, and image misalignment become more noticeable. It is necessary to set appropriate printing conditions.

However, the configurations described in Patent Documents 1 and 2 are configured to perform print processing or image processing under printing conditions according to the feature amount of the image recorded in the device, and are therefore suitable for images having periodicity. It was difficult to set the printing conditions to

SUMMARY OF THE INVENTION An object of the present invention is to provide an image forming apparatus, a print setting change method, and a print setting change program capable of setting print setting conditions suitable for an image having periodicity.

An image forming apparatus according to the present invention includes:
An image forming apparatus comprising a recording head having a plurality of recording elements,
a feature amount detection unit that detects a feature amount of input image data;
an image type determination unit that determines the type of the input image data based on the feature amount detected by the feature amount detection unit;
a print setting change unit that changes print setting conditions suitable for the determination result of the image type determination unit;
with
The feature amount detection unit detects a spatial frequency component for each color of the input image data as the feature amount ,
The image type determination unit is configured such that the input image data includes a periodic image having periodic repetition based on a comparison result between the spatial frequency component detected by the feature amount detection unit and the size of the input image data. or not .

A print setting change method according to the present invention includes:
A print setting changing method for an image forming apparatus having a recording head having a plurality of recording elements, comprising:
a step of detecting a spatial frequency component for each color of input image data as a feature quantity;
determining the type of the input image data based on the detected feature quantity;
changing a print setting condition suitable for the determination result of the type of the input image data;
has
In the step of determining the type, it is determined whether or not the input image data includes a periodic image having periodic repetition, based on a comparison result between the detected spatial frequency component and the size of the input image data. .

A print setting change program according to the present invention includes:
A print setting change program for an image forming apparatus including a recording head having a plurality of recording elements,
to the computer,
feature amount detection processing for detecting spatial frequency components for each color of input image data as feature amounts;
image type determination processing for determining the type of the input image data based on the feature amount detected by the feature amount detection process;
print setting change processing for changing print setting conditions suitable for the determination result of the image type determination processing;
and
The image type determination process is a process of determining whether or not the input image data includes a periodic image having periodic repetition, based on a comparison result between the detected spatial frequency component and the size of the input image data. Including .

According to the present invention, it is possible to set print setting conditions suitable for images having periodicity.

1 is a diagram showing a schematic configuration of an image forming apparatus according to a first embodiment of the invention; FIG. 2 is a block diagram showing the main functional configuration of the image forming apparatus according to the embodiment; FIG. FIG. 4 is a diagram showing an example of input image data; 4 is a diagram for explaining spatial frequency components after Fourier transform of the image shown in FIG. 3; FIG. FIG. 10 is a diagram showing an example of a print setting screen; FIG. FIG. 10 is a diagram showing an example of a proposal for changing print setting conditions on the print setting screen; 5 is a flow chart showing an example of an operation when executing print setting change control in an image forming apparatus; 5 is a flow chart showing an example of an operation when executing print setting change control in an image forming apparatus; FIG. 4 is a diagram showing an example of input image data; 9 is a diagram showing horizontal color information at a predetermined position of the image shown in FIG. 8; FIG.

A first embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a diagram showing a schematic configuration of an image forming apparatus 1 according to the first embodiment of the invention.

As shown in FIG. 1, the image forming apparatus 1 is an inkjet image forming apparatus, and includes a belt conveying device 2, a recording head 3, and the like.

In the belt conveying device 2, an endless conveying belt 23 having a predetermined width is stretched over a driving roller 21 and a driven roller 22 which are arranged in parallel with each other at a predetermined interval. The upper surface of the transport belt 23 stretched over the driving roller 21 and the driven roller 22 serves as a mounting surface on which the recording medium P is mounted in close contact.

Note that the surface of the transport belt 23 is coated with an adhesive called adhesive so that the recording medium P being transported adheres to the upper surface of the transport belt 23 . Further, the driving roller 21 is driven by a sub-scanning motor (not shown).

In the belt conveying device 2, the driving roller 21 is rotated at a predetermined speed in the counterclockwise direction (see the arrow) in FIG. The conveyor belt 23 is rotated. By this operation, the recording medium P placed on the upper surface of the transport belt 23 is transported in the direction of arrow A in the figure, which is the sub-scanning direction.

As the recording medium P, for example, recording media commonly used for inkjet recording, such as paper, fabric, plastic film, and glass plate, can be used. The recording medium P may be in the form of a sheet that is cut into a predetermined size, or may be in the form of a long sheet that is continuously drawn out from an original wound roll.

A belt cleaning device (not shown) is provided on the side of the belt conveying device 2 opposite to the conveying surface of the recording medium P. As shown in FIG. This belt cleaning device removes foreign matter adhering to the conveying belt 23 .

The recording head 3 has a plurality of recording elements (inkjet heads) and is arranged at a predetermined interval above the surface of the conveying belt 23 on which the recording medium P is placed. The recording head 3 ejects ink droplets from a large number of nozzles provided on its lower surface to record a desired image on the recording medium P conveyed by the rotational movement of the conveying belt 23 .

In this embodiment, the recording head 3 is a shuttle-type recording head that is mounted on a carriage (not shown) and reciprocates in a scanning direction orthogonal to the conveying direction of the intermittently conveyed recording medium P. In this case, the driving of the drive roller 21 is controlled such that the transport belt 23 performs an intermittent operation in which the standby state and the driving state are repeated during recording.

The recording head 3 is a line-type recording head that is fixedly spanned across the width direction of the conveying belt 23 and records an image by ejecting ink droplets onto the continuously conveyed recording medium P. may be In this case, the driving of the drive roller 21 is controlled so that the transport belt 23 moves (rotates) continuously during recording.

FIG. 2 is a block diagram showing the main functional configuration of the image forming apparatus 1. As shown in FIG. The image forming apparatus 1 includes a control unit 100 , a recording head driving unit 110 , a transport driving unit 120 , an input/output interface 130 , a feature amount detection unit 140 , an image type determination unit 150 , a print setting acquisition unit 160 and a print setting change unit 170 . Prepare.

The control unit 100 has a CPU 101 (Central Processing Unit), a RAM 102 (Random Access Memory), a ROM 103 (Read Only Memory), and a storage unit 104 .

The CPU 101 reads various control programs and setting data stored in the ROM 103, stores them in the RAM 102, and executes the programs to perform various arithmetic processing. Further, the CPU 101 centrally controls the overall operation of the image forming apparatus 1 .

The RAM 102 provides a working memory space for the CPU 101 and stores temporary data. Note that the RAM 102 may include nonvolatile memory.

The ROM 103 stores programs for various controls executed by the CPU 101, setting data, and the like. Instead of the ROM 103, a rewritable non-volatile memory such as an EEPROM (Electrically Erasable Programmable Read Only Memory) or flash memory may be used.

The storage unit 104 stores a print job (image recording command) input from the external device 6 via the input/output interface 130 and image data related to the print job. As the storage unit 104, for example, an HDD (Hard Disk Drive) is used, and a DRAM (Dynamic Random Access Memory) or the like may be used together.

Under the control of the control unit 100, the recording head driving unit 110 supplies the recording head 3 with a driving signal corresponding to the image data at an appropriate timing. The appropriate amount of ink is ejected.

The transport drive unit 120 rotates the transport belt 23 at a predetermined speed and timing by supplying a drive signal to the sub-scanning motor of the drive roller 21 under the control of the control unit 100 .

The input/output interface 130 mediates transmission and reception of data between the external device 6 and the control unit 100 . The input/output interface 130 is composed of, for example, various serial interfaces, various parallel interfaces, or a combination thereof.

The external device 6 is, for example, a personal computer, and supplies an image recording command (print job), image data, etc. to the control section 100 via the input/output interface 130 .

The feature amount detection unit 140 detects feature amounts of input image data input from the external device 6 . The feature quantity detection unit 140 detects the periodicity of the input image data as a feature quantity. Specifically, the feature amount detection unit 140 detects a spatial frequency component for each color as a feature amount by Fourier transforming each color of the input image data.

For example, as shown in FIG. 3, it is assumed that the input image data is an image G1 having a geometric pattern of black striped images, ie, periodic repetition. The image G1 is an image that is tilted so that it is positioned higher in the vertical direction as it goes rightward in the horizontal direction (left-right direction).

When the feature amount detection unit 140 performs Fourier transform on the image G1, it acquires spatial frequency components as shown in FIG. In FIG. 4, the vertical axis is the vertical component of frequency, and the horizontal axis is the horizontal component of frequency. In the case of the image G1 shown in FIG. 3, for example, a spatial frequency component A1 in the second quadrant and a spatial frequency component A2 in the fourth quadrant in FIG. 4 are obtained. Spatial frequency components A1 and A2 have coordinate positions symmetrical with respect to the origin O. FIG.

The spatial frequency components A1 and A2 have larger values as the number of striped images in the image G1 of the input image data increases. That is, the spatial frequency d corresponding to each distance between the spatial frequency components A1 and A2 and the origin O increases as the number of periodic repetitions in the image increases. The feature amount detection unit 140 detects this spatial frequency d.

Note that the feature amount detection unit 140 detects by calculating the above spatial frequency d, but may acquire the result of the calculation from the outside and detect the acquired value as the feature amount. Further, the colors of the image G1 may be RGB colors or CMYK colors.

The image type determination section 150 determines the type of input image data based on the feature amount detected by the feature amount detection section 140 . Specifically, the image type determination unit 150 determines whether the input image data has a periodic repetition based on the comparison result between the spatial frequency d detected by the feature amount detection unit 140 and the size of the input image data. Determine whether an image is included.

The image type determination unit 150 determines that the input image data includes a periodic image when the ratio of the wavelength to the size of the input image data is equal to or less than a predetermined value (eg, 1/10). Note that the wavelength is the reciprocal of the spatial frequency d. Also, the predetermined value can be appropriately set to a value such that the wavelength is smaller than the size of the input image data.

Here, the size of the input image data is the length of the diagonal of the image G1, since the spatial frequency d is the distance based on both vertical and horizontal components. The diagonal line is, for example, a line connecting the upper left vertex and the lower right vertex in the rectangular image G1.

Also, when the spatial frequency is a distance based only on the vertical component, the size of the input image data is the length of the image G1 in the vertical direction. Also, when the spatial frequency is a distance based only on the horizontal component, the size of the input image data is the horizontal length of the image G1.

In this way, by using the fact that the wavelength is smaller than the size of the input image data as the determination criterion, it is possible to easily determine that the input image data includes a periodic image having periodic repetition. .

The print setting acquisition unit 160 acquires print setting conditions for input image data. The print setting conditions are, for example, conditions shown in the setting portion C of the print setting screen 6A on the external device 6, as shown in FIG. 5A. The setting portion C shows the image name, image type, length, width, resolution, density, and redundancy. In the initial setting of the print setting conditions, for example, the redundancy of printing is set to a relatively low level.

Specifically, when the image type determination unit 150 determines that the input image data includes a periodic image, the print setting acquisition unit 160 acquires the print setting conditions of the input image data. The print setting acquisition unit 160 determines whether or not the print setting conditions are suitable for periodic images.

A print setting condition suitable for a periodic image is, for example, a setting condition for forming a finer image by increasing the number of scans in the recording head 3 . In the present embodiment, the print setting condition suitable for periodic images is a condition for setting the redundancy of the above printing to a relatively high level.

When the printing redundancy is at a high level, the print setting acquisition unit 160 determines that the print setting condition is suitable for the periodic image. If the print redundancy is not at a high level, the print setting acquisition unit 160 determines that the print setting condition is not suitable for the periodic image.

The print setting change unit 170 changes the print setting conditions acquired by the print setting acquisition unit 160 to print setting conditions suitable for the determination result of the image type determination unit 150 . Specifically, when the input image data includes a periodic image and the print setting conditions acquired by the print setting acquisition unit 160 are not suitable for the periodic image, the print setting changing unit 170 performs printing suitable for the periodic image. Outputs suggested commands for setting changes to setting conditions.

The setting change proposal command is a command for proposing a change in print setting conditions to the user, and in the present embodiment, it is a command for proposing a change to a higher level of printing redundancy. The setting change proposal command is output to the print setting screen 6A of the external device 6 via the input/output interface 130, for example.

The external device 6 that has acquired the setting change proposal command displays, for example, the print setting screen 6A of the print setting conditions as shown in FIG. 5B. FIG. 5B shows a display example of, for example, "The print settings are under a condition with a low redundancy that is not suitable for a print image. Do you want to change to a condition with a high redundancy that is suitable for a print image?" ing.

By doing so, the user can easily understand that the current print setting conditions are not suitable for the periodic image.

Then, when the redundancy setting is changed, the print setting change unit 170 changes the print setting condition to a condition corresponding to the setting change. Specifically, when the user changes the condition to a higher level of redundancy, the print setting change unit 170 acquires the change command via the input/output interface 130 . After that, the print setting change unit 170 changes the print setting condition to a condition with a high level of redundancy.

By doing so, the print setting conditions are changed to the conditions suitable for the periodic images, so that the print setting conditions suitable for the periodic images can be set. As a result, it is possible to suppress image defects such as streaks, unevenness, and misalignment that occur when the periodic image is printed.

As for the method for changing the printing redundancy, a changing method suitable for the printing method of the image forming apparatus, such as a multi-pass method or an interleave method, is applied.

Next, an operation example when executing print setting change control in the image forming apparatus 1 will be described. First, an operation example when executing print setting change control on the print setting screen will be described. FIG. 6 is a flow chart showing an example of an operation when executing print setting change control in the image forming apparatus 1 . The processing in FIG. 6 is appropriately executed when the print setting screen 6A is displayed to the user in the external device 6. FIG.

As shown in FIG. 6, the image forming apparatus 1 detects feature amounts of input image data (step S101). Next, the image forming apparatus 1 determines whether or not the image in the input image data includes a periodic image (step S102).

As a result of the determination, if the image does not include the periodic image (step S102, NO), this control ends. On the other hand, if the image includes a periodic image (step S102, YES), the image forming apparatus 1 outputs to the external device 6 a command to display a periodic image in the image type portion of the print setting screen 6A (step S103).

Next, the image forming apparatus 1 determines whether or not the print setting conditions are suitable for periodic images (step S104). As a result of the determination, if the print setting conditions are suitable for the periodic image (step S104, YES), this control ends.

On the other hand, if the print setting conditions are not suitable for the periodic image (step S104, NO), the image forming apparatus 1 outputs a proposal command for conditions suitable for the periodic image to the external device 6 (step S105). After step S105, this control ends.

Next, an operation example when executing print setting control during print processing will be described. FIG. 7 is a flow chart showing an example of an operation when executing print setting change control in the image forming apparatus 1 . The processing in FIG. 7 is appropriately executed when the control unit 100 receives a print job execution command.

As shown in FIG. 7, the image forming apparatus 1 determines whether an image in input image data includes a periodic image (step S201). As a result of the determination, when the image does not include the periodic image (step S201, NO), the process transitions to step S207. On the other hand, if the image includes a periodic image (step S201, YES), the image forming apparatus 1 acquires print setting conditions (step S202).

After step S202, the image forming apparatus 1 determines whether or not the print setting conditions are suitable for periodic images (step S203). As a result of the determination, if the print setting conditions are suitable for periodic images (step S203, YES), the process transitions to step S207.

On the other hand, if the print setting conditions are not suitable for the periodic images (step S203, NO), the image forming apparatus 1 outputs to the external device 6 a command proposing a change to the conditions suitable for the periodic images (step S204). .

Next, the image forming apparatus 1 determines whether or not the print setting conditions have been changed (step S205). As a result of determination, if the print setting conditions have not been changed (step S205, NO), the process proceeds to step S207.

On the other hand, if the print setting conditions have been changed (step S205, YES), the image forming apparatus 1 changes the print setting conditions (step S206). Next, the image forming apparatus 1 executes print processing (step S207). After step S207, this control ends.

According to the present embodiment configured as described above, since the feature amount detection unit 140 detects the periodicity of the input image data as a feature amount, the print setting condition suitable for the image periodicity of the input image data is set. can be changed. That is, in the present embodiment, it is possible to set print setting conditions suitable for images having periodicity.

Further, by using the spatial frequency component of the image, it is possible to relatively easily determine whether or not the input image data includes a periodic image.

Further, when a periodic image is included in the input image data and the print setting conditions are not suitable for the periodic image, a proposal command to change the setting to the print setting condition suitable for the periodic image is output. can quickly inform the user that is not suitable for periodic images.

Also, when the print setting conditions are changed, the print processing is performed after the print settings have been changed. occurrence can be suppressed.

Next, a second embodiment of the invention will be described. In the first embodiment, the spatial frequency component for each color of the input image data is used as the feature quantity. In the second embodiment, the feature amount detection unit 140 detects color information in the horizontal direction (predetermined direction) of the input image data as the feature amount.

For example, as shown in FIG. 8, it is assumed that the input image data is an image G2 in which a plurality of periodic curves are arranged side by side. The feature quantity detection unit 140 detects color information in the horizontal direction of the input image data as a feature quantity.

For example, the horizontal color information at a predetermined vertical position P1 in the image G2 fluctuates as shown in FIG. FIG. 9 shows each color information in RGB. In FIG. 9, L1 indicates R color, L2 indicates G color, and L3 indicates B color. Note that the color information may be CMYK color information.

In this way, in the image G2 whose color information periodically fluctuates within the range of the input image size, the feature amount detection unit 140 detects horizontal color information at each position in the vertical direction.

The image type determination section 150 determines whether or not the input image data includes a periodic image based on the periodic variation of the color information detected by the feature quantity detection section 140 .

The image type determination unit 150 determines that the input image data includes a periodic image, for example, when the periodic variations of the color information match at a plurality of positions in the vertical direction. The print setting acquisition unit 160 and the print setting change unit 170 perform the same processing as in the first embodiment.

Even with such a configuration, the print setting conditions are changed to the conditions suitable for the periodic image, so it is possible to set the print setting conditions suitable for the periodic image. As a result, it is possible to suppress image defects such as streaks, unevenness, and image misalignment that occur when an image having periodicity is printed.

Also, in the second embodiment, the feature amount detection unit 140 detects only horizontal color information, but the present invention is not limited to this. For example, the feature amount detection unit 140 may detect only vertical color information, may detect both horizontal and vertical color information, or may detect diagonal color information. can be

Further, in the second embodiment, when the periodic variations of the color information match at a plurality of positions in the vertical direction, it is determined that the input image data includes a periodic image, but the present invention is not limited to this. For example, it is determined that the input image data includes a periodic image based on other criteria such as whether the periodic fluctuations of the color information are similar at a plurality of positions or whether the frequencies of the periodic fluctuations match. can be

By the way, in a relatively simple image G1 as shown in FIG. 3, the number of calculated spatial frequency components is relatively small. Therefore, in the image G1, the first embodiment is effective from the viewpoint of simplification of feature amount detection. On the other hand, in a relatively complicated image G2 as shown in FIG. 8, periodic variations in color information at each position in a predetermined direction are sufficiently detected. Therefore, in the image G2, the second embodiment is effective from the viewpoint of improving the accuracy of feature amount detection.

Therefore, the feature amount detection unit 140 may select either the spatial frequency component for each color or the periodic variation of the color information as the feature amount according to the image.

In the above-described embodiment, a proposal command for setting changes to the print setting conditions is output to the user, but the present invention is not limited to this, and the proposal command does not need to be output. In this case, the print setting changing unit 170 may automatically change the print setting condition according to the determination result of the image type determining unit 150 .

Further, in the above-described embodiment, the print setting acquisition unit 160 is provided, but the present invention is not limited to this, and the print setting change unit 170 is used for the image type determination unit 150 without acquiring the print setting conditions. The print setting conditions may be automatically changed according to the determination result.

Further, in the above embodiment, the feature amount detection unit 140, the image type determination unit 150, the print setting acquisition unit 160, and the print setting change unit 170 are provided separately, but the present invention is not limited to this. For example, the feature amount detection unit, image type determination unit, print setting acquisition unit, and print setting change unit may be incorporated in the control unit.

Further, in the above embodiment, an inkjet image forming apparatus is used as an example of an image forming apparatus, but the present invention is not limited to this. For example, an image forming apparatus having a recording head having a plurality of recording elements, such as an LED (Light Emitting Diode) type image forming apparatus, may be used as the image forming apparatus of the present invention.

In addition, each of the above-described embodiments is merely an example of specific implementation of the present invention, and the technical scope of the present invention should not be construed to be limited by these. Thus, the invention may be embodied in various forms without departing from its spirit or essential characteristics.

1 image forming apparatus 2 belt conveying device 3 recording head 6 external device 21 driving roller 22 driven roller 23 conveying belt 100 control section 110 recording head driving section 120 conveying driving section 130 input/output interface 140 feature amount detecting section 150 image type determining section 160 Print setting acquisition unit 170 Print setting change unit

Claims (9)

An image forming apparatus comprising a recording head having a plurality of recording elements,
a feature amount detection unit that detects a feature amount of input image data;
an image type determination unit that determines the type of the input image data based on the feature amount detected by the feature amount detection unit;
a print setting change unit that changes print setting conditions suitable for the determination result of the image type determination unit;
with
The feature amount detection unit detects a spatial frequency component for each color of the input image data as the feature amount ,
The image type determination unit is configured such that the input image data includes a periodic image having periodic repetition based on a comparison result between the spatial frequency component detected by the feature amount detection unit and the size of the input image data. determining whether or not
Image forming device. An image forming apparatus comprising a recording head having a plurality of recording elements,
a feature amount detection unit that detects a feature amount of input image data;
an image type determination unit that determines the type of the input image data based on the feature amount detected by the feature amount detection unit;
a print setting change unit that changes print setting conditions suitable for the determination result of the image type determination unit;
with
The feature amount detection unit detects, as the feature amount, a periodic variation of color information in the horizontal direction at each position in the vertical direction of the input image data,
The image type determination unit includes a periodic image in which the input image data has periodic repetition based on the periodic variation of the color information at the plurality of positions in the vertical direction detected by the feature amount detection unit. determining whether or not
Image forming device. a print setting acquisition unit that acquires the print setting conditions of the input image data;
The print setting change unit changes the print setting condition acquired by the print setting acquisition unit according to the determination result of the image type determination unit.
The image forming apparatus according to claim 1 or 2 . a print setting acquisition unit that acquires the print setting conditions of the input image data;
The print setting acquisition unit acquires the print setting conditions of the input image data when the image type determination unit determines that the input image data includes the periodic image, and the print setting conditions are set to the determining whether or not the print setting conditions are suitable for the periodic image;
The image forming apparatus according to any one of claims 1 to 3 . When the input image data includes the periodic image and the print setting conditions acquired by the print setting acquisition unit are not suitable for the periodic image, the print setting changing unit performs printing suitable for the periodic image. output suggested directives for setting changes to setting conditions,
The image forming apparatus according to claim 4 . The print setting change unit changes the print setting condition to a condition corresponding to the setting change when the setting change is performed.
The image forming apparatus according to claim 5 . The print setting change unit changes the setting of the number of scans of the recording head in the print setting conditions.
The image forming apparatus according to any one of claims 1 to 6 . A print setting changing method for an image forming apparatus having a recording head having a plurality of recording elements, comprising:
a step of detecting a spatial frequency component for each color of input image data as a feature quantity;
determining the type of the input image data based on the detected feature quantity;
changing a print setting condition suitable for the determination result of the type of the input image data;
has
In the step of determining the type, it is determined whether or not the input image data includes a periodic image having periodic repetition, based on a comparison result between the detected spatial frequency component and the size of the input image data. ,
How to change print settings. A print setting change program for an image forming apparatus including a recording head having a plurality of recording elements,
to the computer,
feature amount detection processing for detecting spatial frequency components for each color of input image data as feature amounts;
image type determination processing for determining the type of the input image data based on the feature amount detected by the feature amount detection process;
print setting change processing for changing print setting conditions suitable for the determination result of the image type determination processing;
and
The image type determination process is a process of determining whether or not the input image data includes a periodic image having periodic repetition, based on a comparison result between the detected spatial frequency component and the size of the input image data. including,
Print settings change program.

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