JP2002057904A - Method and apparatus for image forming and recording medium having its program recorded thereon - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image forming apparatus which has an image expansion memory whose capacity covers only one of division pages in the case of printing both sides of an original through division and which can reduce the expansion processing than that of a conventional image forming apparatus and to provide its image forming method and a recording medium having its program recorded thereon. SOLUTION: Compressed data stored in a compression data storage memory 16 are expanded by each division page, and a compression data storage buffer 19 stores a compression data address at the head of a succeeding division page and its reference line every time the expansion of one page is finished. After expansion of all the compression data stored in the compression data storage memory 16 is completed, the head address and its reference line of an optional division page are extracted and expansion processing is applied to the compression data denoted by them. When the expansion of the page is finished, the page is printed. The image forming processing is finished when the processing succeeding to the processing of reading the head address and its reference line is applied to all the compressed data stored in the compression data storage memory 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus for printing an image, and more particularly, to an image forming apparatus having a function of double-sided printing and divided printing, and having a memory area for developing an image having only one page, and an image forming apparatus. The present invention relates to a forming method and a recording medium on which the program is recorded.

[0002]

2. Description of the Related Art In order for printed matter output in double-sided printing to be arranged in page order, the pages must be output in the order of 2 → 1 → 4 → 3... By a mechanical mechanism of printing. There are cases that must be done.

In such a case, there is no problem if two or more memory areas for expanding the compressed data can be secured. However, if there is only one memory area for reducing the cost, the order of the expanded pages is changed. Such control is required. At this time, there is a particular problem when there is division printing.

[0004] Division printing means, for example, that an A3-size original is divided into two A4-size originals and output.
This is a printing mode in which one page is divided into a plurality of pages and printed. In addition, it is common to add an overwriting area so that the image printed at this time is not lost.

The overwriting area prints the last few centimeters of the image of the previous page at the beginning of the next page, so that the output printed matter is easy to see and at the same time, the image is not chipped.

Since the print data originally expands (decompresses) one page of compressed data, it is necessary to always decompress the data from the first page of the division when dividing the print data. This is because it is not possible to identify the location of a page break unless the compressed data is actually decompressed, and the compressed data such as MMR used in the facsimile apparatus requires a reference line when decompressing.

[0007]

However, in an image forming apparatus having only a development memory area for one page to be divided, the image is divided and printed on both sides, and the output document is rearranged in page order and printed out. In this case, since it is necessary to decompress each page of the compressed data from the beginning, for example, when a long document is divided into six and printed, (1,2) → 1 → (2,3) 4) → (1, 2,
3) → (4,5,6) → (1,2,3,4,5), requiring a total of 17 pages of decompression processing, which makes the decompression processing of compressed data very troublesome. there were.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and is intended to be applied to an image forming apparatus having only one page of expanded memory area for performing split printing by double-sided printing and printing overprinted portions. It is another object of the present invention to provide an image forming apparatus, an image forming method, and a recording medium on which a program thereof is recorded, in which the number of pages to be expanded is reduced and the processing efficiency is improved.

[0009]

In order to achieve the above object, according to the present invention, there is provided an image data compressing means for compressing image data, a compressed data storing means for storing compressed image data, and a storage means. Image forming apparatus comprising: compressed data decompressing means for decompressing compressed image data; decompressed data storing means for storing decompressed image data; and image data printing means for reading and printing the stored image data. A compressed data address storage means for storing a compressed data address indicating an address where compressed image data is present in the compressed data storage means; and compressed data for selecting one of the stored compressed data addresses. Address selecting means, and compressed data reading means for reading image data compressed based on the selected compressed data address; Has a compressed data expanding means is characterized by decompressing the compressed data compressed data reading means has read.

According to a second aspect of the present invention, in the first aspect of the present invention, when the compressed data decompression means needs a reference line to be referred to when decompressing the compressed data, the compressed data address storage means is required. The compressed data address selecting means selects the required reference line at the same time as selecting it, and the compressed data reading means reads the required reference line at the same time as reading.

[0011] The invention according to claim 3 is the invention according to claim 1 or 2.
In the invention described above, a print image size detection unit that detects a size of an image that can be printed by an image forming apparatus, and an image that divides an image stored by a compressed data storage unit into one or more pages according to the size of the detected image Dividing means, 1
Divided compressed data address detecting means for detecting a compressed data address at the forefront of each image divided into pages or more, wherein the compressed data address selecting means includes a compressed data detected by the divided compressed data address detecting means. Addresses are alternately selected from odd-numbered pages in ascending order from the smallest even-numbered page.

According to a fourth aspect of the present invention, in the third aspect of the present invention, the overwriting area, which is a region having a predetermined area at the rearmost portion of the page generated by the division and which is printed twice on the preceding and succeeding pages, Overwriting area storing means for storing the overwriting area corresponding to the last reference line and the starting address of the overwriting area, and a compressed image indicated by the corresponding starting address taken out of the overwriting area stored by the overwriting area storing means And an overwriting area copying means for copying immediately before the data, wherein the copying is performed immediately before reading by the compressed data reading means.

According to a fifth aspect of the present invention, in the third aspect of the present invention, the compressed data address storage means is an area having a predetermined area at the end of the page generated by the division, and is printed twice on the preceding and succeeding pages. The top reference line and the top address of the overwriting area to be written are also stored, and the top reference line and the top address of the corresponding overwriting area are also selected at the time of selection.

According to a sixth aspect of the present invention, in the invention of any one of the third to fifth aspects, the division number determining means for determining whether the number of divisions is two or less as a result of the division is provided. The image data printing means prints the second page of the divided image and then prints the first page of the divided image if the result of the determination is that the number is 2 or less. It is characterized by.

According to a seventh aspect of the present invention, in the image forming method having the step of compressing the image data, the first decompressing step of dividing the compressed image data into one or more pages according to the size of the print and expanding it. And a start address which is the address of the compressed image data existing at the top of each page generated by the division, and a reference line required when expanding the compressed image data indicated by the start address. A line address saving step for saving; a first decompression step completion detection step for determining whether the first decompression step and the line address storage step have been performed for all the compressed image data of one or more pages; Line address extracting step for extracting the start address and reference line of the compressed image data indicated by the extracted start address The top caused by the division 1
The image processing apparatus further includes a second decompression step of decompressing the compressed image data of the page, and an image data printing step of printing the image data decompressed in the second decompression step.

According to an eighth aspect of the present invention, in the invention of the seventh aspect, immediately after the line address storing step, the region having the predetermined area at the rear end of the page generated by the division is twice applied to the preceding and succeeding pages. An overwriting area storing step of storing the overwriting area to be printed in association with the start address immediately after the overwriting area and a reference line required for expanding the start address, and detecting the end of the first expansion step Immediately after the step, an overwriting area copying step of taking out the overwriting area saved in the overwriting area saving step and copying immediately before the compressed image data indicated by the corresponding top address, I do.

According to a ninth aspect of the present invention, in the invention of the seventh aspect, immediately after the line address storing step, the region having the predetermined area at the rear end of the page generated by the division is twice applied to the preceding and succeeding pages. The method further includes an overwriting area address storing step of storing the leading address of the foremost part of the overwriting area to be printed and the reference line required for expanding the leading address in association with each other. The forefront reference line and the head address of the corresponding overwriting area are also taken out.

The invention according to claim 10 is the invention according to claims 7 to 9
In the invention according to any one of the above, a division number determination step of determining whether or not a total number of divisions is 2 or less as a result of dividing the image data in the first decompression step; If it is determined in the process that it is 2 or less,
A first page expansion step for expanding the first page generated by the division, a second page expansion step for expanding the second page generated by the division, and a second page for printing the second page of the expanded division An eye printing step, a second first page expansion step of expanding the first page of the division again, and a first page printing step of printing the first page of the expanded division.
Is further provided.

According to an eleventh aspect of the present invention, in a recording medium storing a program for causing an image forming apparatus to execute a process of compressing image data, the compressed image data is reduced to one or more pages according to a print size. First decompression processing for dividing and decompressing, decompressing a head address which is an address of compressed image data existing at the head of each page generated by the division, and compressed image data indicated by the head address Reference line needed when
, A first decompression process completion detection process for determining whether or not the first decompression process and the line address storage process have been performed for all of the compressed image data of one or more pages; A line address extraction process for extracting an arbitrary start address and a reference line, and a process for expanding one page of compressed image data generated by division, starting with the compressed image data indicated by the extracted start address 2 expansion processing;
And an image data printing process for printing the image data expanded in the second expansion process.

According to a twelfth aspect of the present invention, in the invention of the eleventh aspect, immediately after the line address storing process, the region having the predetermined area at the rearmost portion of the page generated by the division is used twice in the preceding and succeeding pages. Overwriting area saving processing for saving the overwriting area to be printed in correspondence with the start address immediately after the overwriting area and the reference line required for expanding the start address, and detecting the end of the first expansion processing Immediately after the processing, the overwriting area saved in the overwriting area saving processing is taken out, and the overwriting area copying processing of copying immediately before the compressed image data indicated by the corresponding start address is further executed. And

According to a thirteenth aspect of the present invention, in the eleventh aspect of the present invention, immediately after the line address storing process, the region having the predetermined area at the rear end of the page generated by the division is twice transmitted to the preceding and succeeding pages. It further has an overwriting area address storing process for storing the leading address of the foremost part of the overwriting area to be printed and the reference line required for expanding the leading address in association with each other. It is characterized by further executing a process of extracting the foremost reference line and the head address of the corresponding overwriting area.

According to a fourteenth aspect of the present invention, in the invention according to any one of the eleventh to thirteenth aspects, as a result of dividing the image data in the first decompression processing, the total number of divisions is two or less. In the number-of-divisions determination process for determining whether or not there is, if the number-of-divisions determination process determines that the number is 2 or less, a first first-page expansion process for expanding the first page generated by the division, Second page extension processing for extending the generated second page,
A second page printing process for printing the page, a second first page expansion process for expanding the first page of the division again, and a first page printing process for printing the first page of the expanded division. It is further characterized by being executed.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of an image forming apparatus, an image forming method, and a recording medium on which the program is recorded according to the present invention will be described in detail with reference to the accompanying drawings. 1 to 5 show an embodiment of an image forming apparatus, an image forming method, and a recording medium on which the program is recorded according to the present invention. The present invention is not construed as being limited to the embodiments described below.

In the following description, it is assumed that the image forming apparatus has only one page of development memory capable of developing the divided print image when performing divided printing on both sides.

FIG. 1 is a schematic configuration diagram of a facsimile apparatus applied as one embodiment of the present invention. The facsimile apparatus according to the present embodiment uses a compression encoding method of MMR.
The reference line means a line required for expansion, and expansion and expansion are synonymous.

The facsimile apparatus 10 includes a scanner unit 1
1, operation unit 12, display unit 13, plotter unit 14, system control unit 15, compressed data storage memory 16, image data compression unit 17, image data decompression unit 18, compressed data storage buffer 19, image expansion memory 20, and modem NCU It has a part 21.

The scanner section 11 reads an original and transmits image information to the inside of the facsimile apparatus 10. The plotter 14 prints the read image information. The compression unit 17 compresses image data. In the compressed data storage memory 16,
The compressed data compressed by the compression unit 17 is stored. The compressed data storage buffer 19 stores the last line of the page to be divided, the start address of the compressed data of the next page, and the overwriting area. Have been.

The compressed data is expanded (expanded) in the image expansion memory 20 by the expansion unit 18. It is assumed that the amount of data that can be expanded in the image expansion memory 20 at one time is equal to or more than one page and equal to or less than two pages of the divided print image.

FIG. 2 is a diagram for explaining the following processing. The compressed data shown on the left is expanded in the image expansion memory 20 shown in the figure. At this time, the data is read out based on the data stored in the compressed data storage buffer 19. In this figure, the overwriting area is also stored, and is read immediately before reading the corresponding reference line and compressed data address.

Hereinafter, based on the flowchart of FIG.
A description will be given of a printing process capable of terminating compressed data decompression processing twice regardless of the number of divisions.

The order of printing the divided pages is 2 → 1
It is assumed that print processing is performed in such a manner that an even number and an odd number are exchanged as in → 4 → 3. In this process, the decompression process is performed twice, and the first process is a process for saving the last reference line stored in the image expansion memory 20 and the start address of the compressed data of the next page. The second process is a process for printing.

When the printing process is started, the data compressed by the compression unit 17 is decompressed by the decompression unit 18 from the previously input data (step S1). This process is performed until the decompression process of the compressed data for one page of the division is completed.

When the decompression processing of the compressed data for one page of the division is completed (step S2 / Yes), the last line, the address of the head of the compressed data to be decompressed next (the reference line of the next page, Is stored in the compressed data storage buffer 19 (step S3). This decompression process is performed until all the input compressed data is decompressed.

When all the compressed data have been decompressed (step S4 / Yes), any one of the reference line and the start address stored in step S3 is extracted (step S5), and the compressed data of the selected page is extracted. The decompression process is started from (step S6). When the extension of the page is completed (Step S7 / Yes), the data of the extended page is printed (Step S8).

If unprinted data remains (step S9 / Yes), the process returns to step S5, and if all data has been printed (step S9 / N).
o), the printing process ends.

By operating as described above, when an image forming memory having only one divided page in the image development memory performs divided printing on both sides, the number of decompression processes is reduced as compared with the conventional printing process. The printing process is greatly simplified.

Generally, at the time of divided printing, the last image of a divided page is printed at the head of the next page so as not to cause image loss. This is called overwriting. Hereinafter, based on the flowchart of FIG. 4, in the processing of FIG.
A description will be given of a process of copying and saving the data in another buffer, and adding that part to the head when printing the next page and printing the same.

In this embodiment, it is assumed that the overwriting area is determined such as the last centimeter of the page.

For the sake of simplicity, only the differences from the processing of FIG. 3 will be described. In step S13, when the reference line and the address of the next compressed data are stored in a storage buffer (not shown) (step S13), the overwritten area is also copied and stored in the compressed data storage buffer 19 (step S14).

When the first compression data decompression process is completed (step S15), the overwriting area of the previous page of the page to be printed stored in step S14 is taken out and copied to the top of the page to be printed. (Step S16). Subsequent processing is the same as in FIG.

By operating as described above, when an image forming memory having only one page of divided image development memory is used to perform divided printing on both sides, the data is stored in the compressed data storage buffer 19 and the data of the previous page is stored. Since the data of the last part is added and printed, in addition to the processing of FIG. 3, a portion of overwriting is also added, so that the image is not lost and the convenience is greatly improved. .

When the number of divisions is 2 pages or less, the number of times of decompression processing is (1,2) → 3 times per page even if printing is performed by the conventional processing, which is the same number of times as when the above processing is performed. Becomes In such a case, processing such as saving the address of the reference line or the compressed data is wasted.

Hereinafter, based on the flowchart of FIG.
If the number of divisions is 2 pages or less, print by the conventional method, and
The processing in which the processing of FIG. 3 or FIG. 4 is performed in the case of pages or more will be described.

When the printing process is started, it is determined whether or not the number of divisions is 2 pages or less (step S31). If the number of divisions is not 2 pages or less (step S31 / N).
o), the process of FIG. 3 or FIG. 4 is performed (step S32), and the process ends.

If the number of divisions is two or more (step S31 / Yes), the first page of the division is extended (step S33), and the second page is extended (step S3).
4). Since only the data of the second page is stored in the image development memory 20, the second page is printed (step S35).

Thereafter, the decompression process for the first page is performed again (step S36), the first page is printed (step S37), and the process ends.

By operating as described above, in the case where the image forming memory has only one divided page and the image forming memory is divided and printed on both sides, the process of storing the reference line and the compressed data address is not performed. Is selected according to the number of divisions and printing is performed, so that wasteful processing is omitted and the convenience is greatly improved.

[0048]

As is apparent from the above description, the image forming apparatus according to the first aspect can read all the compressed data only by the address where the compressed data is stored, so that the printing of the image data can be performed. Can be freely changed, and the convenience is greatly improved.

The image forming apparatus according to the second aspect is the first aspect.
Since the reference line can be handled in the described image forming apparatus, it can be applied to a compression-type apparatus that requires a reference line when data is decompressed, and the convenience is greatly improved.

According to a third aspect of the present invention, there is provided the image forming apparatus according to the first aspect.
Alternatively, in the image forming apparatus described in 2, the print processing is performed by selecting from the second page of the divided pages. Even so, it is possible to output in page order, which greatly improves convenience.

According to a fourth aspect of the present invention, there is provided the image forming apparatus according to the third aspect.
In the image forming apparatus described above, the overwriting area is also stored and printed, so in double-sided divided printing,
The image is not missing, and the convenience is further improved.

According to a fifth aspect of the present invention, there is provided the image forming apparatus according to the third aspect.
In the image forming apparatus described above, since only the address of the overwriting area is stored and printed, the amount of memory capacity used is reduced, and the convenience is further improved.

The image forming apparatus according to the sixth aspect is the third aspect.
6. The image forming apparatus according to any one of 1 to 5,
It is determined whether or not the number of divisions is 2 or less, and if the result of the determination is 2 or less, the process of saving and reading the reference line and the compressed data address is eliminated, so that the process in that case is simplified, and it is very convenient. Improved.

According to the image forming method of the present invention, it is possible to read out the compressed data of an arbitrary page only by storing the reference line and the compressed data address. Even when printing is performed by an image forming apparatus having only an image development memory, printout can be performed in page order, and an efficient image forming method can be provided.

The image forming method according to the eighth aspect is the seventh aspect.
In the described image forming method, the overwriting area is also saved and printed, so in the double-sided divided printing,
Thus, an image forming method with no loss of images and improved convenience could be provided.

The image forming method according to the ninth aspect is the seventh aspect of the invention.
In the described image forming method, since only the address of the overwriting area is stored and printed, the amount of memory capacity used is reduced, and the convenience is further improved.

According to a tenth aspect of the present invention, in the image forming method according to any one of the seventh to ninth aspects, it is determined whether or not the number of divisions is 2 or less.
In the following case, the process of saving and reading the reference line and the compressed data address is not performed, so that the process in that case is simplified and the convenience is greatly improved.

According to the recording medium storing the program according to the eleventh aspect, it is possible to read out the compressed data of an arbitrary page only by storing the reference line and the compressed data address. When printing is performed by an image forming apparatus having only one page of image development memory, printout can be performed in the order of pages, and a program for causing an efficient image forming apparatus to execute processing is recorded. The medium could be provided.

The recording medium on which the program according to the twelfth aspect has been recorded can store and overwrite the same area as the recording medium on which the program according to the eleventh aspect has been recorded. Is no longer missing, and convenience is improved.

According to the recording medium storing the program according to the thirteenth aspect, the recording medium storing the program according to the eleventh aspect saves only the address of the overwriting area and prints it. The volume has been reduced and the convenience has been further improved.

According to a fourteenth aspect of the present invention, there is provided a recording medium storing the program according to any one of the eleventh to thirteenth aspects, wherein the number of divisions is determined to be two or less. If the determination result is 2 or less, the process of saving and reading the reference line and the compressed data address is not performed, so that the process in that case is simplified and the convenience is greatly improved.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a facsimile apparatus applied as one embodiment of the present invention.

FIG. 2 is a diagram for explaining the operation of the facsimile machine 10;

FIG. 3 is a flowchart illustrating a process in which the facsimile apparatus 10 takes out an arbitrary reference line and a compressed data address and prints the data.

FIG. 4 is a flowchart illustrating a process of extracting an overwriting area in addition to the process of FIG. 3;

FIG. 5 is a flowchart showing a process of performing a conventional process without performing the process of FIG. 3 or 4 when the number of divisions is 2 or less.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Facsimile apparatus 11 Scanner part 12 Operation part 13 Display part 14 Plotter part 15 System control part 16 Compressed data storage memory 17 Image data compression part 18 Image data decompression part 19 Compressed data storage buffer 20 Image development memory 21 Modem NCU part

Claims (14)

[Claims] An image data compression unit for compressing image data; a compressed data storage unit for storing the compressed image data; a compressed data expansion unit for expanding the stored compressed image data; An image forming apparatus comprising: decompressed data storage means for storing the decompressed image data; and image data printing means for reading and printing the stored image data. Compressed data address storage means for storing a compressed data address indicating an address where the compressed image data exists; compressed data address selection means for selecting one of the stored compressed data addresses; Compressed data reading means for reading out the compressed image data based on the compressed data address,
The compressed data decompressing means decompresses the compressed data read by the compressed data reading means. 2. When the compressed data decompression means needs a reference line to refer to when decompressing the compressed data, the compressed data address storage means stores the required reference line, 2. The image forming apparatus according to claim 1, wherein the address selecting unit selects the required reference line simultaneously with the selection, and the compressed data reading unit reads the required reference line simultaneously with the reading. apparatus. 3. A print image size detecting means for detecting a size of an image which can be printed by the image forming apparatus, and an image stored by the compressed data storing means in one or more pages according to the detected image size. Image dividing means for dividing, and a divided compressed data address detecting means for detecting the compressed data address at the forefront of each image divided into one or more pages; and the compressed data address selecting means, 3. The image forming apparatus according to claim 1, wherein the compressed data addresses detected by the divided compressed data address detecting means are alternately selected from odd-numbered pages in ascending order from the smallest even-numbered page. . 4. A region having a predetermined area at the rear end of a page generated by the division, which is overprinted twice to be printed on the previous and next pages. An overwriting area storing means for storing the overwriting area corresponding to the start address; and taking out the overwriting area stored by the overwriting area storing means, and copying immediately before the compressed image data indicated by the corresponding start address. The image forming apparatus according to claim 3, further comprising an overwriting area copying unit, wherein the copying is performed immediately before reading by the compressed data reading unit. 5. The compressed data address storage means is an area having a predetermined area at the end of a page generated by the division, and the reference line at the forefront of an overwrite area printed twice on the previous and next pages. 4. The image forming apparatus according to claim 3, wherein the first address and the first address are also stored, and the reference line and the first address at the forefront of the overwriting area corresponding to the selection are also selected. 5. 6. A division number judging means for judging whether or not the number of divisions is 2 or less as a result of the division, wherein when it is judged that the number of divisions is 2 or less, The image data printing means prints a second page of the divided image, and then prints a first page of the divided image. Image forming apparatus. 7. An image forming method comprising a step of compressing image data, wherein the compressed image data is compressed according to a print size.
A first decompression step of dividing and decompressing into pages or more, a head address which is an address of the compressed image data existing at the head of each page generated by the division, and the compression indicated by the head address A line address storing step of storing a reference line required when the expanded image data is expanded, and wherein the first expanding step and the line address storing step store the compressed image data of one or more pages. A first decompression step end detection step of determining whether or not all of the compression processing has been performed; a line address extraction step of extracting any of the start address and the reference line; A second page extending the compressed image data of one page generated by the division, starting with the image data obtained
And an image data printing step of printing the image data expanded in the second expansion step. 8. Immediately after the line address storing step,
The overwriting area, which is an area having a predetermined area at the end of the page generated by the division and is printed twice on the preceding and succeeding pages, is divided into the head address immediately after the overwriting area and the expansion of the head address. An overwriting area storing step of storing the overwriting area corresponding to the reference line required at the time, and immediately after the first decompression step completion detecting step, taking out the overwriting area stored in the overwriting area storing step 8. The image forming method according to claim 7, further comprising: an overwriting area copying step of copying immediately before the compressed image data indicated by the corresponding start address. 9. Immediately after the line address storing step,
A leading area of a predetermined area in the last part of the page generated by the division, which is required at the time of decompressing the leading address of the leading part of the overwriting area printed twice on the preceding and succeeding pages. It further comprises an overwriting area address storing step of storing the reference line in association with the reference line, and the foremost reference line and the head address of the overwriting area corresponding to the line address extracting step are also extracted. The image forming method according to claim 7, wherein 10. A division number judging step of judging whether or not the number of divisions as a result of division of the image data in the first decompression step is 2 or less, and If it is determined to be 2 or less, a first page for expanding the first page generated by the division
A first page extension step, a second page extension step of extending the second page generated by the division, a second page printing step of printing the extended second page of the division, 10. The method according to claim 7, further comprising: a second first page expansion step of expanding the page again; and a first page printing step of printing the expanded first page of the division. 11. The image forming method according to claim 1. 11. A recording medium on which a program for causing an image forming apparatus to execute a process of compressing image data is recorded.
A first decompression process of dividing and decompressing into pages or more, a head address which is an address of the compressed image data existing at the head of each page generated by the division, and the compression indicated by the head address A line address storage process for storing a reference line required when the expanded image data is expanded, and wherein the first expansion process and the line address storage process are performed on the compressed image data of one or more pages. A first decompression processing end detection processing for determining whether or not all the processing has been performed; a line address extraction processing for extracting any of the start address and the reference line; and the compression processing indicated by the extracted start address. A second page extending the compressed image data of one page generated by the division, starting with the image data obtained
A decompression process; and an image data printing process for printing the image data decompressed in the second decompression process. 12. An overwriting area, which is an area of a predetermined area at the end of a page generated by the division immediately after the line address storage processing and which is printed twice on the preceding and succeeding pages, And an overwriting area saving process for saving the leading address and the reference line required for the extension of the leading address immediately after the overwriting area saving process. 12. The program according to claim 11, further comprising: taking out the overwritten area saved in the overwritten area saving processing, and copying the overwritten area immediately before the compressed image data indicated by the corresponding start address. Recording medium on which is recorded. 13. The head of a predetermined area at the end of a page generated by the division immediately after the line address storage processing, the forefront of an overwrite area printed twice on the previous and next pages. An overwriting area address storing process for storing an address and the reference line required for expanding the head address in association with each other, the foreground of the overwriting area corresponding to the line address extracting process. 12. A recording medium on which the program according to claim 11, further comprising executing a process of extracting the reference line and the start address of the unit. 14. A division number judging process for judging whether or not a total number of divisions as a result of dividing the image data in the first decompression process is 2 or less; If it is determined to be 2 or less, a first page for expanding the first page generated by the division
A first page decompression process; a second page decompression process for decompressing a second page generated by the division; a second page print process for printing the decompressed second page; 14. The apparatus according to claim 11, further comprising: a second first page expansion process for expanding the page again, and a first page printing process for printing the expanded first page of the division. A recording medium on which the program described in 1 is recorded.