JP3812222B2 - Document reading apparatus and image forming apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention acquires an image data by reading a document, performs a scaling process and an image rotation on the acquired image data, a document reading method used in the document reading apparatus, and the scaling process. The present invention relates to an image forming apparatus that forms an image rotated based on the image data, and an image forming method used in the image forming apparatus.
[0002]
[Prior art]
In an image forming apparatus such as a digital copying apparatus, a document is read to convert image information into an electrical signal, and the image data acquired by processing the electrical signal is subjected to various image processing such as scaling and image rotation. To form an image.
[0003]
The image rotation process is a function mainly used to adjust the vertical / horizontal relationship between the original and the recording paper. The image is formed by conveying the recording paper in the horizontal orientation with respect to the original read in the vertical orientation. When it is performed, the image data is rotated 90 degrees so as to fit the horizontally long recording paper.
[0004]
Also, the image rotation function is often used in combination with the scaling function. That is, for example, when an image is formed on an A4 size horizontally long recording sheet from a document placed in a portrait length B5 size, in many image forming apparatuses, a vertically long image is converted into a 90 degree image along with enlargement processing. An image is formed by performing a rotating image rotation process. As described above, the function of automatically scaling and rotating the image according to the set size and orientation of the original and the size and orientation of the recording paper by combining the image rotation function and the scaling function will be described below. This is called the “automatic scaling” function.
[0005]
[Problems to be solved by the invention]
In image formation using AMS, enlarged image formation is often performed from B5 size to B4 size or A4 size to A3 size. The procedure of image data processing from document reading to image formation is that image data that is digital data is created from an electrical signal from the reading means when the image processing involves scaling processing and image rotation processing. After the scaling process is performed on the generated image data, the image data for one page is stored in the page memory for storing the image data, and the image rotation is performed when writing to the page memory or reading from the page memory. Done.
[0006]
Many conventional ordinary image forming apparatuses are configured such that the width of an A3-size document, that is, 297 mm, is the maximum length in the main scanning direction. Therefore, in the scaling process, the length of the image data after scaling in the main scanning direction is limited to 297 mm, and the image data exceeding this length is truncated. Therefore, by using the AMS, a small-size original such as A4 portrait or B5 portrait is read, zoomed and rotated, and an A3 size (420 mm) having a length in the main scanning direction longer than 297 mm. ) Or B4 size (364 mm), even if A3 size or B4 size recording paper is prepared, the image data of the portion exceeding 297 mm is cut off due to the limit of scaling capability . Therefore, in the conventional image forming apparatus, it is impossible to enlarge from the B5 size portrait to the B4 size landscape or from the A4 size portrait to the A3 size landscape. It was necessary to form an image with the document set sideways.
[0007]
In order to eliminate the above-described inconveniences in image formation using AMS, it is necessary to increase the length in the main scanning direction that can be processed by the image processing circuit such as scaling. However, increasing the length in the main scanning direction causes an increase in circuit scale such as a line buffer, which is not preferable because of an increase in cost.
[0008]
There are two types of images: portrait image and landscape image. A document in which these images are recorded is handled differently in handling such as page alignment, binding processing, bookbinding, and filing. In the mode in which an image is formed on one side of a recording sheet from a single-sided original in the case of image formation from a portrait original and in the case of image formation from a landscape original, the portrait original and the landscape original are not distinguished. There is no problem even if image formation is performed in the image formation. However, in image formation when at least one of the document and the recording paper is a double-sided image, the image formation is performed by distinguishing between the portrait image and the landscape image. If the processed recording paper is not processed, an image formed product in which the page order and the image orientation are not unified is created. In order to make the user's operation easy to understand, it is desirable to set the original on the image forming apparatus with the top-to-bottom direction of the original always fixed. In an image forming apparatus that can set the original vertically or horizontally, The portrait and landscape are distinguished by the aspect ratio of the document, such as portrait when the document is set vertically or horizontally so that the top and bottom of the document is fixed, portrait when set vertically and landscape when set horizontally. Image formation is performed. On the other hand, in an image forming apparatus in which a document can be set only in landscape orientation, a portrait and a landscape are distinguished by a button for setting a portrait and a landscape, and an image in an orientation and a page order suitable for each mode is formed. Countermeasures are possible.
[0009]
However, when the document is enlarged to a large size such as the B4 size or the A3 size depending on the document size and the scaling factor as described above, the image forming apparatus has only a landscape orientation due to the limitation due to the ability of the scaling unit. Although it is possible to set the document in portrait orientation because it cannot be enlarged, when enlarging from a portrait document, in some cases the portrait document is set in landscape orientation and the portrait image is printed in the correct page order. Therefore, it is necessary to perform a special operation for setting the image forming apparatus so that the image is formed.
[0010]
The object of the present invention is to solve the above-mentioned problems in the prior art.
[0011]
In the first, third, fourth, sixth, eighth, and eleventh inventions, an image enlarged to a large size can be formed without increasing the scale of the zoom circuit. To. In addition, when a large size is changed by dividing the image data, a high-quality image is obtained in which the boundary of the image divided for the enlargement process does not stand out.
[0012]
According to the second, third, fifth, sixth, ninth, and twelfth aspects of the invention, an image enlarged to a large size can be formed without increasing the circuit scale of the zoom circuit. enable. In addition, a large-size scaling function is realized at low cost without using a page memory for scaling processing.
[0013]
According to the seventh and tenth aspects of the present invention, it is possible to form an image enlarged to a large size without increasing the scale of the zoom circuit.
[0014]
According to the thirteenth aspect of the present invention, an image can be formed in the correct page order and image orientation on the recording paper accommodated in all the image forming apparatuses including the maximum size from both the portrait original and the landscape original. Providing equipment.
[0015]
[Means for Solving the Problems]
The object of the present invention is achieved by the following invention.
[0016]
(1) Reading means for reading a document image by performing main scanning and sub-scanning,
A divided page memory for storing image data for one page obtained by reading by the reading means;
Dividing means for reading out image data by dividing from the dividing page memory;
A scaling unit that performs a scaling process on the image data read from the division page memory;
A page memory for rotation for storing image data for one page output from the scaling means;
Image rotating means for performing image rotation processing for rotating an image by 90 degrees when image data is written into the page memory for rotation and the image data is read from the page memory;
It is determined whether or not the image data after the scaling by the scaling unit exceeds the size that can be handled by the scaling unit, and if it exceeds, the image data obtained by reading by the reading unit is divided. The image data is stored in a page memory, divided by the dividing unit in the main scanning direction and input to the scaling unit, and a scaling process is performed for each divided image data. The divided image data after the doubling process is combined and stored in the page memory for rotation, and if it does not exceed, the image data obtained by reading by the reading means is input to the scaling means without being divided. Control means for storing the image data after scaling in the page memory for rotation,
A document reading apparatus comprising:
[0017]
(2) Reading means for reading an image of a document by performing main scanning and sub-scanning,
A scaling unit for performing scaling processing on the image data obtained by reading by the reading unit;
A page memory for rotation for storing image data for one page output from the scaling means;
Image rotating means for performing image rotation processing for rotating the image by 90 degrees when image data is written to the page memory for rotation and image data is read from the page memory for rotation;
It is determined whether or not the image data after the scaling by the scaling unit exceeds the size that can be handled by the scaling unit, and if it exceeds, the reading by the reading unit is divided in the main scanning direction. The image data obtained by the plurality of readings is obtained by performing the multiple times to obtain the divided image data, scaling the divided image data by the scaling unit, and storing it in the page memory. Are combined on the page memory. If not exceeding, the image of the original is read by one reading by the reading means, and the image data obtained by the one reading is changed by the scaling means. Control means for storing in the page memory after double processing;
A document reading apparatus comprising:
[0018]
(3) The document reading apparatus according to item (1) or (2), wherein the reading unit outputs image data scaled in the sub-scanning direction.
[0019]
(4) Reading means for reading a document image by performing main scanning and sub-scanning,
A divided page memory for storing image data for one page obtained by reading by the reading means;
Dividing means for reading out image data by dividing from the dividing page memory;
A scaling unit that performs a scaling process on the image data read from the division page memory;
A page memory for rotation for storing image data for one page output from the scaling means;
Image rotating means for performing image rotation processing for rotating an image by 90 degrees when image data is written into the page memory for rotation and the image data is read from the page memory;
It is determined whether or not the image data after the scaling by the scaling unit exceeds the size that can be handled by the scaling unit, and if it exceeds, the image data obtained by reading by the reading unit is divided. The image data is stored in a page memory, divided by the dividing unit in the main scanning direction and input to the scaling unit, and a scaling process is performed for each divided image data. The divided image data after the doubling process is combined and stored in the page memory for rotation, and if it does not exceed, the image data obtained by reading by the reading means is input to the scaling means without being divided. Control means for storing the image data after scaling in the page memory for rotation;
Image forming means for forming an image based on the image data stored in the rotation page memory;
An image forming apparatus comprising:
[0020]
(5) Reading means for reading the image of the document by performing main scanning and sub-scanning,
A scaling unit for performing scaling processing on the image data obtained by reading by the reading unit;
A page memory for rotation for storing image data for one page output from the scaling means;
Image rotating means for performing image rotation processing for rotating the image by 90 degrees when image data is written to the page memory for rotation and image data is read from the page memory for rotation;
It is determined whether or not the image data after the scaling by the scaling unit exceeds the size that can be handled by the scaling unit, and if it exceeds, the reading by the reading unit is divided in the main scanning direction. The image data obtained by the plurality of readings is obtained by performing the multiple times to obtain the divided image data, scaling the divided image data by the scaling unit, and storing it in the page memory. Are combined on the page memory. If not exceeding, the image of the original is read by one reading by the reading means, and the image data obtained by the one reading is changed by the scaling means. Control means for storing in the page memory after doubling processing; and
Image forming means for forming an image based on image data stored in the page memory for rotation;
An image forming apparatus comprising:
[0021]
(6) The document reading apparatus according to (4) or (5), wherein the reading unit outputs image data scaled in the sub-scanning direction.
[0022]
(7) a reading stage in which an image of one page of a document is scanned in the main scanning direction and the sub-scanning direction to obtain image data divided in the main scanning direction and enlarged in the sub-scanning direction;
A scaling step for enlarging the divided image data acquired in the reading step in the main scanning direction,
A synthesizing step for synthesizing and storing the image data scaled by the scaling step in the page memory for rotation;
An image rotation stage for performing an image rotation process for rotating the image by 90 degrees with respect to the synthesized image data;
A document reading method comprising:
[0023]
(8) In the reading step, image data is acquired by reading one page of a document by one scan, and the acquired image data is divided in the main scanning direction. The document reading method according to item 7).
[0024]
(9) The document reading according to (7), wherein, in the reading step, image data divided into a plurality of parts is acquired by scanning a page of the document divided into a plurality of times in the main scanning direction. Method.
[0025]
(10) a reading stage in which an image of one page of a document is scanned in the main scanning direction and the sub-scanning direction, and image data divided in the main scanning direction and enlarged in the sub-scanning direction is acquired;
A scaling step for enlarging the divided image data acquired in the reading step in the main scanning direction,
A synthesizing step for synthesizing and storing the image data scaled by the scaling step in a page memory;
An image rotation stage for performing an image rotation process for rotating the image by 90 degrees with respect to the synthesized image data; and
An image forming stage for forming an image based on the image data subjected to image rotation processing;
An image forming method comprising:
[0026]
(11) In the reading step, image data is acquired by reading one page of a document by one scan, and the acquired image data is divided in the main scanning direction. The image forming method according to item 10).
[0027]
(12) The image formation according to (10), wherein, in the reading step, image data divided into a plurality of parts is obtained by scanning a page of a document divided into a plurality of times in the main scanning direction. Method.
[0029]
DETAILED DESCRIPTION OF THE INVENTION
(1) Embodiment
FIG. 1 is a block diagram showing a configuration of an image forming apparatus according to Embodiment 1 of the present invention.
[0030]
In the figure, a thick arrow represents transmission of image data, and a thin arrow represents transmission of a control signal.
[0031]
In the figure, reference numeral 2 denotes a reading unit that scans a document in the main scanning direction and the sub-scanning direction and outputs image data. The reading unit 2 outputs the image data scaled in the sub-scanning direction when scaling the image. Reference numeral 3 denotes image processing means for performing various image processing such as filter processing and density adjustment processing on the image data output from the reading means, and reference numeral 4 denotes an image memory for storing image data. A dividing unit 5 divides image data for one page into two, and divides the image data into two when reading the image data from the dividing page memory 5a having a capacity for storing image data for one page. A scaling unit 5 performs a scaling process in the main scanning direction. The scaling process is performed by a known interpolation / extraction method using a line memory. 7 has a function of writing and reading image data to and from the rotating page memory 7a having a capacity for storing image data for one page. It is an image rotation means for performing image rotation processing to rotate. Reference numeral 8 denotes image output means for performing image writing by laser writing means or LED writing means. 10 is a document detection means for detecting the document size and the orientation of the document in portrait or landscape orientation, 11 is a recording sheet detection means for detecting the orientation of the recording sheet in size and portrait or landscape orientation, and 12 is an AMS function setting. This is setting means for accepting settings for various image forming conditions such as setting of portrait originals and landscape originals or setting of recording paper to be used.
[0032]
Although the present embodiment has a configuration as shown in the figure, an image in the same direction as an image of a document is not performed on the basis of image data obtained by image reading by the reading unit 2 without performing a process of rotating the image by 90 degrees. And an image formed by rotating an image of a document by 90 degrees. Image formation without rotation is normal image formation. However, when an image of a vertically long document is formed on a horizontally long recording paper or when an image of a horizontally long document is formed on a vertically long recording paper, the image is rotated by 90 degrees. The accompanying image formation is performed.
[0033]
In normal image formation, a document is scanned in the main scanning direction by a line CCD (not shown) included in the reading unit 2, and the document is conveyed in the sub-scanning direction, or the reading optical system (not shown) is sub-scanned. The original is scanned while scanning in the sub-scanning direction. Image data obtained by reading is subjected to image processing such as filter processing and density adjustment processing by the image processing means 3 and then stored in the image memory 4. At the time of image formation, image data is read from the image memory 4. The image is output to the image output means 8, and an image is formed in the image output means 8.
[0034]
In image formation with 90 ° rotation of an image, the image data read from the image memory 4 is stored in the rotation page memory 7a, and when the image data is written in the rotation page memory 7a, or the rotation page memory 7a. When image data is read out from the image data, the image rotation means 7 performs an image rotation process for rotating the image by 90 degrees, and then outputs the image data to the image output means 8. The image output means 8 forms an image. In the normal image forming step and the image forming step with 90 ° rotation of the image, image data is stored in the image rotating means 7 from the image memory 4 through the dividing memory 5a and output to the image output means 8. You may do it.
[0035]
In addition to the image forming process described above, the image formation accompanied with the image rotation process reads out one page of image data from the dividing page memory 5a by the dividing means 5 and divides the image data into two parts as will be described later. There is an image formation in which the image rotation means 7 performs image rotation processing for rotating the image by 90 degrees after the magnification processing by the magnification changing means 6 for each of the image data.
[0036]
The control means 1 sends and receives control signals to and from the respective processing units and controls them.
[0037]
When AMS is set in the setting means 12, the document size and orientation information detected by the document detection means 10 and the recording paper detection means 11 are detected or set using the setting means 12. Based on the information on the size and orientation of the recording paper, the control means 1 selects the magnification and determines whether or not to rotate the image so that an image aligned with the recording paper is formed. For example, when an A4R (landscape A4 size) original is detected by the original detection means 10 and the setting means 12 is set to form an image on an A4R recording sheet, the control means 1 changes the scaling means. A control signal is output at an equal magnification with respect to 6 to perform image formation without performing image rotation processing, but an A4 (vertically long A4 size) document is detected and set by the document detection means 10. When the means 12 is set to form an image in A3 size (horizontal A3 size), the control means 1 outputs a control signal for enlarging 1.41 times to the scaling means 6. Then, a signal for instructing the image rotation unit 8 to rotate the image is output to form an enlarged image on the A3 size recording paper.
[0038]
The control of the control means 1 will be described with reference to the flowchart of FIG. In FIG. 2, the patterns indicated by D1 to D6 beside the steps from reading to image formation schematically show one page of image data. In the following description, A3 size is the maximum size of recording paper, and A3 size recording paper is stored and transported so that the recording paper transport direction, that is, the sub-scanning direction during recording, is the long side of the A3 size recording paper. Control is performed in the image forming apparatus.
[0039]
In step 1, a document is read. In reading in step F1, scaling in the sub-scanning direction is performed. That is, a vertically long A4 size document indicated by D1 is read, and image data D2 enlarged in the sub-scanning direction is output from the reading means 2. The image data D2 has a size of (0, 0) to (297, 297). Image data D2 scaled in the sub-scanning direction is obtained by changing the document conveying speed in the automatic document feeder or by changing the scanning speed of the optical scanning means. In step F2, it is determined whether the length in the main scanning direction of the image after zooming exceeds 300 mm, which is slightly larger than 297 mm, which is the short side length of the A3 size, which is the maximum size. . In the present embodiment, the line memory for the zooming unit 6 to perform operations such as interpolation during zooming processing has a capacity that matches the document with a width of 300 mm, and 300 mm is the processing limit of the zooming unit 6. It is.
[0040]
For example, when the length in the main scanning direction after the enlargement is 300 mm or less as in the case of enlarging from the A4R size (horizontally long A4 size) to the A3 size, the process proceeds to step F5 and the enlargement in the main scanning direction is performed. Is called.
[0041]
In step F2, when it is found as a result of calculation that the length in the main scanning direction after zooming exceeds 300 mm, the image data D2 is stored in the dividing page memory 5a (F3). Next, first, the image data D3 of (0, 0) to (297/2, 297) is read from the dividing page memory 5a (F4), enlarged by 1.41 times in the main scanning direction, and (0 , 0) to (210,297) is obtained (F5), and the left half (0,0) of the page memory 6 having storage areas (0,0) to (210,297) is obtained. (210, 297) (the lower half in FIG. 2) is stored (F6).
[0042]
This scaling and storage processing is also performed on the remaining divided image data. That is, the image data D3 in the region (297/2, 0) to (297, 297) is read from the dividing page memory 5a, and enlarged and scaled by 1.41 times in the main scanning direction (210, 297). Image data D4 having a size of (420, 297) is obtained and stored in the right half of the page memory 6 (upper half in FIG. 2). By such storage in step F6, image data D5 having a size of (0, 0) to (420, 297) is synthesized and stored in the page memory 7 for rotation. When the zooming / storing process performed for each line is completed (F7), the image rotation process is performed (F8).
[0043]
In the image rotation process of step F8, main scanning readout is performed in the direction from the address (0,297) to the address (0,0) in the rotation page memory 7a, and from the address (0,297) to the address (420,297). By performing sub-scanning reading in the heading direction and outputting it to the image output means 8, image output for forming an image based on the image data rotated by 90 degrees is performed in step F9, and it is performed on a horizontally long A3 size recording sheet. An enlarged image D6 is formed.
[0044]
The document detection means 10 detects the size of the document and whether the document is portrait or landscape, and determines whether the document is a portrait document or a landscape document from the detection result.
[0045]
P in FIG. 5 indicates a portrait document, which has a front image “1” and a back image “2”. The back image “2” shows an image viewed through the recording paper from the front surface. R indicates a landscape manuscript. As is apparent from FIG. 5, the portrait document P and the landscape document R have different orientation relationships between the front image and the back image, and image processing suitable for the portrait document P and the landscape document R is performed. However, in this embodiment, when forming an image on B4 size and A3 size recording paper, a horizontally long recording paper is used, but the image processing is shown in FIG. The portrait original shown in FIG. 5 is processed to form an image, and page alignment corresponding to the portrait image is performed.
[0046]
This sort of processing is performed based on the document size information obtained from the document detection means 10 and information on the orientation of the document.
[0047]
The setting means 12 is provided with a setting button (not shown) for setting a portrait original image forming mode and a landscape original image forming mode, and sorting of processing for the portrait original and the landscape original by operating the setting button. Can also be done. In any case, regardless of the document size and scaling ratio, all recording sheets including the maximum size recording sheet that can be used in the image forming apparatus are not limited, and scaling and scaling can be performed with a common operation. It is possible to perform image formation by performing an operation.
[0048]
(2) Embodiment 2
FIG. 3 is a block diagram showing the configuration of the image forming apparatus according to Embodiment 2 of the present invention.
[0049]
The image data processing system is different from the embodiment shown in FIG. 1 in that there is no division page memory 5a. However, as shown in the flowchart of FIG. It is very different.
[0050]
In the present embodiment, first, determination in step F10 similar to step F2 in FIG. 1 is performed. If it is determined in step F10 that the length in the main scanning direction of the image after scaling is 300 mm or less as a result of the calculation, the reading unit 2 scans one page of the document in one scan. Scanning reading is performed (F11). By this reading, image data scaled in the sub-scanning direction is acquired as in the first embodiment. The image data acquired in step F11 is subjected to scaling processing in the main scanning direction (F12), stored in the rotation page memory 7a (F13), image rotation (F23), and image output (F24). .
[0051]
In step F10, when it is determined that the length of the image after scaling in the main scanning direction exceeds 300 mm, reading and scaling are performed twice in the main scanning direction. In the first reading, the left half (lower half in FIG. 4) of the document D10 is read (F15). The obtained image data D11 is scaled in the main scanning direction to obtain image data D12 (F16), and the left half of (0, 0) to (210, 0) of the page memory for rotation 7a. Image data is stored in the area (lower half in FIG. 4) (F17). Next, the second reading is performed, and the right half (the upper half in FIG. 4) of the original is read (F19). The obtained image data D13 is scaled in the main scanning direction to obtain image data D14 (F20), which is stored in the areas (210, 0) to (420, 297) of the rotation page memory 7a (F21). The rotation page memory 7a stores image data D15 having a size of (0, 0) to (420, 297). When the zooming and storing process is completed (F22), the image rotation (F23) and the image output (F24) are performed and the process ends.
[0052]
In the above two embodiments, the image is rotated when the image data is read from the rotation page memory 7a. However, when the image data is stored in the rotation page memory 6, the image data may be rotated by 90 degrees. Is possible.
[0053]
【The invention's effect】
In the first, third, fourth, sixth, eighth, and eleventh inventions, an image enlarged to a large size can be formed without increasing the scale of the zoom circuit. Became. In addition, when a large size is changed by dividing the image data, a high quality image can be obtained in which the boundary of the image divided for the enlargement process does not stand out.
[0054]
In the inventions of claim 2, claim 3, claim 5, claim 6, claim 9 and claim 12, an image enlarged to a large size can be formed without increasing the circuit scale of the zoom circuit. It became possible. In addition, a large-size scaling function is realized at low cost without using a page memory for scaling processing.
[0055]
According to the seventh and tenth aspects of the present invention, an image enlarged to a large size can be formed without increasing the scale of the zoom circuit.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of an image forming apparatus according to Embodiment 1 of the present invention.
FIG. 2 is a flowchart of control in Embodiment 1 shown in FIG.
FIG. 3 is a block diagram illustrating a configuration of an image forming apparatus according to a second embodiment of the present invention.
FIG. 4 is a flowchart of control in the second embodiment shown in FIG.
FIG. 5 is a diagram illustrating a portrait document and a landscape document.
[Explanation of symbols]
1 Control means
2 Reading means
3 Image processing means
4 Image memory
5 dividing means
5a Page memory for division
6 Scaling means
7 Image rotation means
7a Rotation page memory
8 Image output means

Claims (12)

Reading means for reading the image of the document by performing main scanning and sub scanning;
A dividing page memory for storing image data for one page obtained by reading by the reading means;
Dividing means for reading out image data by dividing from the dividing page memory;
A scaling unit that performs a scaling process on the image data read from the division page memory;
A page memory for rotation for storing image data for one page output from the scaling means;
When image data is written to the page memory for rotation and image data is read from the page memory, image rotation means for performing image rotation processing for rotating the image by 90 degrees, and image data after scaling by the scaling means are It is determined whether or not the size that can be handled by the scaling unit is exceeded. If it exceeds, the image data obtained by reading by the reading unit is stored in the dividing page memory, and the dividing unit stores the image data. In the main scanning direction and input to the scaling unit, the scaling process is performed for each of the divided image data, and the divided image data after the scaling process by the scaling unit is used for the rotation If not exceeding, the image data obtained by reading by the reading unit is input to the scaling unit without being divided, and the image data after scaling is stored in the page for rotation. Stored in memory Control means,
A document reading apparatus comprising: Reading means for reading the image of the document by performing main scanning and sub scanning;
A scaling unit for performing scaling processing on the image data obtained by reading by the reading unit;
A page memory for rotation for storing image data for one page output from the scaling means;
When image data is written to the page memory for rotation and when image data is read from the page memory for rotation, image rotation means for performing image rotation processing for rotating the image by 90 degrees and image data after scaling by the scaling means Determines whether or not the size exceeds the size that can be handled by the scaling means, and if so, the reading by the reading means is divided in the main scanning direction and performed multiple times to obtain divided image data. Then, the divided image data is scaled by the scaling unit and stored in the page memory, so that the image data obtained by the plurality of readings is synthesized on the page memory and exceeds If not, the control means for reading the image of the document by one reading by the reading means and storing the image data obtained by the one reading in the page memory after the scaling process by the scaling means. Step,
A document reading apparatus comprising:   3. The document reading apparatus according to claim 1, wherein the reading unit outputs image data scaled in the sub-scanning direction. Reading means for reading the image of the document by performing main scanning and sub scanning;
A divided page memory for storing image data for one page obtained by reading by the reading means;
Dividing means for reading out image data by dividing from the dividing page memory;
A scaling unit that performs a scaling process on the image data read from the division page memory;
A page memory for rotation for storing image data for one page output from the scaling means;
When image data is written to the page memory for rotation and image data is read from the page memory, image rotation means for performing image rotation processing for rotating the image by 90 degrees, and image data after scaling by the scaling means are It is determined whether or not the size that can be handled by the scaling unit is exceeded. If it exceeds, the image data obtained by reading by the reading unit is stored in the dividing page memory, and the dividing unit stores the image data. In the main scanning direction and input to the scaling unit, the scaling process is performed for each of the divided image data, and the divided image data after the scaling process by the scaling unit is used for the rotation If not exceeding, the image data obtained by reading by the reading unit is input to the scaling unit without being divided, and the image data after scaling is stored in the page for rotation. Stored in memory And a control unit for forming an image based on the image data stored in the page memory for rotation,
An image forming apparatus comprising: Reading means for reading the image of the document by performing main scanning and sub scanning;
A scaling unit for performing scaling processing on the image data obtained by reading by the reading unit;
A page memory for rotation for storing image data for one page output from the scaling means;
When image data is written to the page memory for rotation and when image data is read from the page memory for rotation, image rotation means for performing image rotation processing for rotating the image by 90 degrees and image data after scaling by the scaling means Determines whether or not the size exceeds the size that can be handled by the scaling means, and if so, the reading by the reading means is divided in the main scanning direction and performed multiple times to obtain divided image data. Then, the divided image data is scaled by the scaling unit and stored in the page memory, so that the image data obtained by the plurality of readings is synthesized on the page memory and exceeds If not, the control means for reading the image of the document by one reading by the reading means and storing the image data obtained by the one reading in the page memory after the scaling process by the scaling means. And image forming means for forming an image based on the image data stored in the page memory for rotation,
An image forming apparatus comprising:   6. The document reading apparatus according to claim 4, wherein the reading unit outputs image data scaled in the sub-scanning direction. A scanning step of scanning an image of one page of a document in the main scanning direction and the sub-scanning direction, and acquiring image data divided in the main scanning direction and enlarged in the sub-scanning direction;
A scaling step for enlarging the divided image data acquired in the reading step in the main scanning direction,
An image rotation stage for performing image rotation processing for rotating the image 90 degrees with respect to the combined image data;
A document reading method comprising:   8. The image reading apparatus according to claim 7, wherein in the reading step, image data is acquired by reading one page of a document by one scan, and the acquired image data is divided in a main scanning direction. Document reading method.   8. The document reading method according to claim 7, wherein, in the reading step, image data divided into a plurality of parts is acquired by scanning a page of the document divided into a plurality of times in the main scanning direction. A scanning step of scanning an image of one page of a document in the main scanning direction and the sub-scanning direction, and acquiring image data divided in the main scanning direction and enlarged in the sub-scanning direction;
A scaling step for enlarging the divided image data acquired in the reading step in the main scanning direction,
A synthesizing step for synthesizing and storing the image data scaled by the scaling step in a page memory;
An image rotation stage for performing an image rotation process for rotating the image by 90 degrees with respect to the synthesized image data, and an image formation stage for forming an image based on the image data subjected to the image rotation process;
An image forming method comprising:   11. The image reading apparatus according to claim 10, wherein in the reading step, image data is acquired by reading one page of a document by one scan, and the acquired image data is divided in a main scanning direction. Image forming method.   11. The image forming method according to claim 10, wherein, in the reading step, image data divided into a plurality of parts is acquired by scanning a page of the document divided into a plurality of times in the main scanning direction.

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