JP3155649B2 - Image processing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention receives image data,
The present invention relates to an image processing apparatus that processes input image data in segments obtained by dividing one page into a plurality of pages.

[0002]

Conventionally, a printer (e.g., bar forming an image composed of segments unit formed by dividing one page into a plurality of image information received from the host computer
An image processing apparatus that performs printing using a printer of a bull-jet system ) is configured as shown in FIG.
As shown in the figure, image data sent from the host computer 4 via the interface 12 and the external interface circuit 5 is written into the segment image memory 6 by the CPU 1. At this time, the ROM 2 is used to hold a program, and the RAM 3 is used as a work RAM for work. Bab image forming unit 8 is imaging a segment image data obtained by dividing image data for one page into a plurality of segments on a recording medium
This is a printer of a jet type, and forms an image based on an image signal 13 read from the segment image memory 6. The address generator 7 generates a read address from the segment image memory 6 based on the synchronization signal 15 from the image forming unit 8.

In general, the printing speed of a bubble jet printer is high, and printing is performed at a constant speed while one segment is being printed. Therefore, all image data necessary for printing one segment is stored in a semiconductor memory. (SRAM, DRAM, etc.) must be stored in the high-speed image memory 6.

The segment image memory 6 has a capacity enough to hold image data corresponding to one segment, and repeatedly receives and prints image data from the host computer 4 for each segment constituting one page, thereby obtaining one segment. Form an image of the page.

However, in the above-mentioned conventional example, since the transfer and printing of image data from the host computer are repeated for each segment constituting one page, the host computer is restrained until printing of one page of image data is completed. was there. Further, when printing a plurality of pages of the same page, each segment must be transferred a plurality of times, and there is a disadvantage that the transfer takes time. On the other hand, as a method of solving this drawback, the capacity of the segment image memory 6 is made to be able to hold one page of image data, and after one page of image transfer is performed from the host computer, printing is performed for each segment. There is a way to repeat. However, this method has a disadvantage that the capacity of the segment image memory 6, which is a semiconductor memory, is large, so that it is expensive.

[0006] Apart from such a conventional example, there is known an image processing apparatus for performing image processing as shown in a flowchart of FIG. Here, the recording medium is described as a recording sheet of a predetermined size.

The image processing apparatus receives PDL data described later from a host computer via an external interface 5 (S101), and writes data to a disk controller and a hard disk controlled by a CPU (S102). S102 and S103 are repeated until data reception for one page is completed (S10
3). Substituting 1 for a variable n representing a segment number (S1
05), the PDL data is read from the hard disk 10, and the CPU 1 develops the PDL data into raster image data for the n-th segment and writes the raster image data in the segment image memory 6 (S106). Output and image formation are performed on the n-th segment from the segment image memory 6 to the image forming unit 8 (S107). If all segments have not been completed (S108), n is incremented by 1 (S1).
09), S106 and S107 are repeated, and upon completion (S108), the recording sheet is discharged from the image forming unit (S1).
10). If the output of the designated number has not been completed, S105
When the processing is completed, the processing returns to S101 (S121). As a result, PDL reception, development, output, and image formation are performed.

[0008]

However, in an image processing apparatus having such a configuration, when printing a plurality of recording sheets, it is necessary to develop PDL data every time one sheet is output. The drawback of requiring the same development time for the second and subsequent pages when the PDL data contains a lot of data, contains a lot of PDL data that requires complicated development, or the PDL development performance of the CPU is low. was there.

Accordingly, an object of the present invention is to provide an image processing apparatus capable of overcoming the above-mentioned drawbacks and outputting a plurality of sheets at high speed.

[0010]

In order to solve the above-mentioned problems, an image processing apparatus according to the present invention comprises an image processing apparatus connected to an image forming unit for recording input image data on a recording medium. an image input means for inputting the coded image data, the inputted U
Developing means for developing coded image data into raster image data, and holding the coded image data comprising a plurality of segments corresponding to at least one page
A first image memory, a second image memory for holding raster image data composed of segments smaller than the one page, and a memory for calling the raster image data from the second image memory to the image forming unit. Transfer means for transferring, the coding corresponding to a predetermined segment
The image data obtained in the segment unit, the first
Read from image memory, expand by the expansion means, expand
Raster image data stored in the second image memory.
And the held raster image data is forwarded by the transfer means.
To the image forming unit, and sequentially
The process from reading the encoded image data to transferring it is repeated.
And control means for controlling the return .

[0011]

With such a configuration, the output of raster image data to the image forming unit is performed by recording coded image data in the first image memory, and then sequentially outputting the image data in units of segments. Repeated transfer of raster image data to image forming unit
It is done by doing. Further, in such a mode, in a case where the number of pages of raster image data output to the image forming unit is at least two, after recording the coded image data in the first image memory, the coded image data is sequentially stored in the second unit in segment units. of was transferred to the image memory, Ru can further implement a mode for forming an image by Kaee repeated transfer to the image forming unit on the recording medium from said second image memory. Therefore,
Image data can be output at high speed.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings.

<Embodiment 1> FIG. 1 is a block diagram for explaining a schematic configuration of an image processing apparatus 50 compatible with color PDL and a flow of image data in a first embodiment. The image processing device 50 is connected to the host computer 4 and the image forming unit 8.

As shown in the figure, an interface 12 and an external interface circuit 5 are provided from a host computer 4.
The PDL data sent via the CPU 1 is written by the CPU 1 to the hard disk 10 via the disk controller 9 and the disk I / F 16. P for one page
When the DL data is arranged in the hard disk 10, when the number of output is one, the CPU 1 reads out the PDL data in the hard disk 10 little by little and develops one pixel for one pixel into raster image data, Write to the segment image memory 6. The segment image memory 6 includes Red, Green, and Blue component memories 6-1 and 6-1.
6-2 and 6-3. The segment image memory 6 is a memory for holding a raster image corresponding to a segment which is a unit smaller than one page.
ROM2 is used to hold programs and RAM2
3 is a work RAM for work, and 11 is a CPU bus. On the other hand, the image forming unit 8 is a color printer that forms an image in units of segments. This type of scheme is
A bubble-jet printer, which is a type of ink- jet printer, is widely used. In the bubble jet method, an image is formed on paper using a print element 19 as shown in FIG. In the figure, the ink supplied from the ink tank 23 is discharged from each nozzle 20 under the control of the discharge control unit 21 and printed on an output medium (recording medium) such as paper. In the case of the image forming apparatus of this embodiment, the number of nozzles is 128, and ejection and non-ejection are controlled for each nozzle. FIG. 3 shows a method of printing on paper 24 using the print element 19. Print head 1
9 moves by 128 pixels while moving in the x direction of the paper 24 as shown at 25, and performs printing in the same manner. An area printed by this one movement in the x direction is called a segment. An image of one page is composed of a plurality of segment images. As a feature of the bubble jet method, it is not possible to stop halfway while printing one segment. However, since it is possible to stop between the segments, it is sufficient that the segment image memory 6 contains raster image data necessary for printing one segment, and the capacity for one page is not required. As described above, since the image is formed in the image forming unit 8 in segment units, all the processes are performed in segment units. That is, reading of PDL data from the hard disk 10 for each segment forming one page, development into a raster image, and output to the image forming apparatus 8 are performed. By repeating this for all segments, image formation of one page is performed. Done. If there are a plurality of output sheets, the CPU 1 develops all the PDL data for one page stored in the hard disk 10 into an area for one output page secured for the raster image in the hard disk 10. Then, for each segment forming one page, 1 to 1
The raster image data for the segment is transferred to the segment image memory 6, and the raster image data is output from the segment image memory 6 to the image forming apparatus 8, and by repeating this, one page image is formed. By repeating this process, the output of the specified number of sheets is completed.

FIGS. 4 to 7 are diagrams for explaining PDL data. Abode Psoset
PDL (Page D) represented by the Script language
As shown in FIG. 4, a description of one page image is described by a character code.
A language for combining and describing elements such as an image description using graphic codes and an image description using raster image data, and the data described using the language is PDL. FIG. 5 is an example of a description using character codes. Reference numeral 1100 denotes a description for designating the color of a character.
It shows the luminance of n and Blue. The minimum is 0.0 and the maximum is 1.0. In step 1100, it is specified that the characters be black. Next, at 1102, the first and second parameters indicate the x and y coordinates of the start position coordinates on the paper on which the character string is laid out, the third parameter indicates the size of the character, and the fourth parameter indicates the space between the characters. The fifth parameter indicates a character string to be laid out. In short, 1102 is an instruction to lay out a character string “IC” with a size of 0.3 and an interval of 0.1 from the coordinates (0.0, 0.0).

FIG. 6 shows an example of description using a graphic code.
1103 designates the color of the line similarly to 1100, and here, Red is designated. Next, reference numeral 1104 designates a line. The first and second parameters are the viewpoint coordinates of the line, and the third and fourth parameters are the x and y coordinates of the end point coordinates. The fifth parameter indicates the thickness of the line.
FIG. 7 is an example of description using raster image data. 110
In 5, the raster image data is substituted for a variable image1. Here, the first parameter represents the image type and the number of color components of the raster image, the second parameter represents the number of bits per component, and the third and fourth parameters represent the image size of the raster image in the x and y directions, respectively. Represent. The fifth and subsequent parameters are raster image data. The number of raster image data is the product of the number of color components forming one pixel and the image size in the x and y directions. In 1105, the RGB image is composed of three color components (Red, Green, Blue), so the number of raster image data is 3 × 5 × 5 = 75.
Individual.

FIG. 8 shows how the graphic descriptions of FIGS. 5, 6 and 7 are interpreted and developed into raster image data in one page. R100, 101, and 102 are obtained by expanding the PDL data of FIGS. 5, 6, and 7, respectively. Here, the entirety of FIG. 8 is a single sheet (reference numeral 2 in FIG. 3).
4), each segment 27-1, 27-
1, 27-3 and 27-4 correspond to the first to fourth segments in FIG. At this time, for example, focusing on the third segment, when printing the third segment, the segment memory 6 includes only one part of R102 and one part of R101, and does not include R100. In such a case, whether or not it can be ignored depends on the position information of each segment and each PDL.
It can be determined from the layout position information in the data (1102, 1104, 1106). For example, since the y-coordinate of the third segment is in the range of 0.4 to 0.8, it overlaps with 1104 and 1106 but does not overlap with 1102.

Next, the detailed operation of this embodiment will be described with reference to the flowchart of FIG. First, in S101, PDL data is received from the host computer 4 one by one.
One unit may be one byte or one page, but may be a unit suitable for processing, for example, one line unit in FIGS.
Next, in S102, the received PDL data is written to the hard disk 10. At this time, in this embodiment, the data is written as it is, but it is also possible to perform the preprocessing of one copy and change the data format before writing. Next, in S103, one page of P
It is determined whether or not the DL data has been received, and if not, the process returns to S101. If the data for one page has been collected, it is determined in S104 whether to output a plurality of sheets. Usually, the number of output sheets is included in the PDL data. If there is only one output, 1 is substituted for n in S105, and S106
Reads the PDL data from the hard disk 10 and develops the nth segment into a raster image. If the read PDL data does not relate to the segment of interest, the next PDL data is read without expanding. When the raster image for the n-th segment is aligned with the raster image memory 6, the image forming unit 8 is started in S107 to form an image for one segment. Next, in S108, it is determined whether or not image formation has been completed for all segments. If not, n is incremented by 1 in S109, and processing of the next segment is performed. On the other hand, if the printing is completed, the print sheet is discharged in S110, and the process returns to S101.

Next, when it is determined in S104 that a plurality of sheets are to be output, all the PDL data stored in the hard disk 10 is read and expanded, and the expanded data is written to the hard disk 10. Next, in step S112, 0 is substituted for p indicating the number of output pages. In step S113, p is compared with the designated number of output pages. If false, 1 is substituted for n in step S114.
S11 stored in the hard disk 10 in S115
The portion included in the n-th segment of the raster image data expanded in 1 is transferred from the hard disk 10 to the raster image memory 6. Next, in step S116, the image forming unit 6 is activated to form an image for one segment. next,
In S117, it is determined whether or not image formation has been completed for all segments. If not, n is incremented by 1 in S118, and processing of the next segment is performed. On the other hand, if the printing has been completed, p is incremented by 1 in S119, the print sheet is discharged in S120, and the process returns to S113. If it is determined in step S113 that p is equal to the number of output sheets, the process returns to step S101.

<Embodiment 2> In this embodiment, only the control software of the first embodiment is changed. Therefore, the configuration of the apparatus of this embodiment is the same as that of FIG. FIG. 10 shows a flowchart of this embodiment, and the operation of the image processing apparatus will be described based on the flowchart.

First, in S201, PDL data is received from the host computer 4 one by one. One unit may be one byte or one page, but is a unit suitable for processing.
For example, it may be in units of one line in FIGS. Next, S202
Then, the received PDL data is written to the hard disk 10. At this time, in this embodiment, the data is written as it is, but it is also possible to perform the preprocessing of one copy and change the data format before writing. Next, in S203, it is determined whether or not PDL data for one page has been received, and if not, the process returns to S201. When the data for one page is completed, all the PDL data stored in the hard disk 10 is read and expanded, and the data after expansion is written to the hard disk 10 (S204). Next, the time required to develop one page of PDL data is measured (S205). The time required for the expansion is obtained by measuring the PDL expansion start time and the end time by using a timer, a clock, or the like connected to the inside of the CPU 1 or the CPU 1, and calculating the difference therebetween. Next, the process A is executed (S206). In process A, 1 is substituted for n in S216, and in S217, the portion included in the n-th segment of the raster image data expanded in S204 and stored in the hard disk 10 is transferred from the hard disk 10 to the raster image memory 6. Next, S218
To start the image forming section 6 and form an image for one segment. Next, in step S219, it is determined whether image formation has been completed for all segments.
Increments n by 1 to process the next segment. on the other hand,
If it has been completed, the process A is completed. Next, in S207, S2
The transfer time of the raster image of one page from the hard disk 10 to the raster image memory 6 is measured in the same manner as the measurement of the PDL development time of 05. In step S208, the output page is discharged. In step S209, 1 is substituted for a variable p indicating the number of output pages, and in step S211 p is compared with the designated output page number. If they are equal, the process returns to S201;
The expansion time measured at 05 and the transfer time measured at S207 are compared. If the development time is long, process A is executed in S213, and if the transfer time is long, process B is executed in S214. In the process B, n in S221
Is substituted into the PD, and in S222, the PD
The L data is read out and developed into a raster image for the nth segment. If the read PDL data does not relate to the segment of interest, the next PDL data is read without expanding. When the raster image for the n-th segment is aligned with the raster image memory 6, the image forming unit 8 is started in S223 to form an image for one segment. Next, in S224, it is determined whether or not the image formation has been completed for all the segments.
The next segment is incremented and processed. On the other hand, if the processing has been completed, the processing B ends. Next, p is increased by 1 and S211
Return to By repeating this, one page is output, and the output of the designated number is completed.

(Others) It should be noted that the present invention includes a means (for example, an electrothermal converter or a laser beam) for generating thermal energy as energy used for discharging ink, particularly in an ink jet recording system. An excellent effect is obtained in a recording head and a recording apparatus of a type in which the state of ink is changed by the thermal energy. This is because according to such a method, it is possible to achieve higher density and higher definition of recording.

The typical structure and principle are described in, for example, US Pat. Nos. 4,723,129 and 4,740.
It is preferable to use the basic principle disclosed in the specification of Japanese Patent No. 796. This method is a so-called on-demand type,
Although it can be applied to any type of continuous type, in particular, in the case of the on-demand type, it can be applied to a sheet holding liquid (ink) or an electrothermal converter arranged corresponding to the liquid path. By applying at least one drive signal corresponding to the recorded information and giving a rapid temperature rise exceeding the nucleate boiling, heat energy is generated in the electrothermal transducer, and film boiling occurs on the heat acting surface of the recording head. Liquid (ink) corresponding to this drive signal on a one-to-one basis.
This is effective because air bubbles inside can be formed. The liquid (ink) is ejected through the ejection opening by the growth and contraction of the bubble to form at least one droplet. When the drive signal is formed into a pulse shape, the growth and shrinkage of the bubble are performed immediately and appropriately, so that the ejection of a liquid (ink) having particularly excellent responsiveness can be achieved, which is more preferable. As the pulse-shaped drive signal, those described in US Pat. Nos. 4,463,359 and 4,345,262 are suitable. Further, if the conditions described in US Pat. No. 4,313,124 relating to the temperature rise rate of the heat acting surface are adopted, more excellent recording can be performed.

As the configuration of the recording head, in addition to the combination of the discharge port, the liquid path, and the electrothermal converter (a linear liquid flow path or a right-angle liquid flow path) as disclosed in the above-mentioned specifications, U.S. Pat. No. 4,558,333 and U.S. Pat. No. 44,558 which disclose a configuration in which a heat acting portion is arranged in a bending region.
A configuration using the specification of Japanese Patent No. 59600 is also included in the present invention. In addition, Japanese Unexamined Patent Application Publication No. 59-123670 discloses a configuration in which a common slit is used as a discharge portion of an electrothermal converter for a plurality of electrothermal converters. The effect of the present invention is effective even if the configuration is based on JP-A-59-138461, which discloses a configuration corresponding to a discharge unit. That is, according to the present invention, recording can be reliably and efficiently performed regardless of the form of the recording head.

Further, the present invention can be effectively applied to a full-line type recording head having a length corresponding to the maximum width of a recording medium on which a recording apparatus can record. Such a recording head may have a configuration that satisfies the length by a combination of a plurality of recording heads, or a configuration as one integrally formed recording head.

In addition, even in the case of the serial type as described above, the recording head fixed to the apparatus main body or the electric connection with the apparatus main body or the ink from the apparatus main body by being mounted on the apparatus main body. The present invention is also effective when a replaceable chip-type recording head that can be supplied or a cartridge-type recording head in which an ink tank is provided integrally with the recording head itself is used.

It is preferable to add a recording head ejection recovery unit, a preliminary auxiliary unit, and the like as the configuration of the recording apparatus of the present invention since the effects of the present invention can be further stabilized. If these are specifically mentioned, the recording head is heated using capping means, cleaning means, pressurizing or suction means, an electrothermal transducer, another heating element or a combination thereof. Pre-heating means for performing the pre-heating and pre-discharging means for performing the discharging other than the recording can be used.

The type and number of recording heads to be mounted are, for example, different from those provided with only one corresponding to a single color ink, and those corresponding to a plurality of inks having different recording colors and densities. A plurality may be provided. That is, for example, the printing mode of the printing apparatus is not limited to a printing mode of only a mainstream color such as black, but may be any of integrally forming a printing head or a combination of a plurality of printing heads. The present invention is also very effective for an apparatus provided with at least one of the recording modes of full color by color mixture.

In addition, in the embodiments of the present invention described above, the ink is described as a liquid. However, an ink which solidifies at room temperature or lower and which softens or liquefies at room temperature may be used. In general, the ink jet method generally controls the temperature of the ink itself within a range of 30 ° C. or more and 70 ° C. or less to control the temperature so that the viscosity of the ink is in a stable ejection range. Sometimes, the ink may be in a liquid state. In addition, in order to positively prevent temperature rise due to thermal energy by using it as energy for changing the state of the ink from a solid state to a liquid state, or to prevent evaporation of the ink, the ink is solidified in a standing state and heated. May be used. In any case, the application of heat energy causes the ink to be liquefied by the application of the heat energy according to the recording signal and the liquid ink to be ejected, or to start solidifying when it reaches the recording medium. The present invention is also applicable to a case where an ink having a property of liquefying for the first time is used. In such a case, the ink
JP-A-54-56847 or JP-A-60-7
As described in Japanese Patent Publication No. 1260, it is also possible to adopt a form in which the sheet is opposed to the electrothermal converter in a state where it is held as a liquid or solid substance in the concave portion or through hole of the porous sheet. In the present invention, the most effective one for each of the above-mentioned inks is to execute the above-mentioned film boiling method.

In addition, the form of the ink jet recording apparatus of the present invention is not only used as an image output terminal of an information processing apparatus such as a computer, but also as a copying apparatus combined with a reader or the like, and a facsimile apparatus having a transmission / reception function. It may take a form.

[0031]

As described above, in the development and output of image data that needs to be developed into raster image data, if there is only one output, the image data that needs to be directly developed into raster image data Is output to a raster image memory and output, and when there are a plurality of outputs, the data is once expanded to a hard disk, and then transferred to a raster image memory and output.
Alternatively, raster image data developed on the hard disk 10 is stored, the first image is formed by repeating the transfer of raster image data from the hard disk 10 to the raster image memory 6, and the second and subsequent images are raster image data. Either expansion of image data requiring expansion to data or transfer of raster image data is selected and output, and a higher-speed output is possible when outputting a plurality of sheets.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a schematic configuration of an image processing apparatus according to the present invention and a flow of image processing.

FIG. 2 is a perspective view for explaining a configuration of a bubble jet type printer head constituting an image forming unit connected to an image processing apparatus according to the present invention and forming an image.

FIG. 3 is a diagram illustrating a configuration of a PDL.

FIG. 4 is a diagram for describing a description example of a PDL.

FIG. 5 is a diagram for describing a description example of a PDL.

FIG. 6 is a diagram for describing a description example of a PDL.

FIG. 7 is a diagram for describing a description example of a PDL.

FIG. 8 is a diagram for explaining an image formed based on PDL.

FIG. 9 is a flowchart illustrating a flow of image processing in an embodiment of the image processing apparatus according to the present invention.

FIG. 10 is a flowchart illustrating a flow of image processing in a second embodiment of the image processing apparatus according to the present invention.

FIG. 11 is a flowchart illustrating a flow of image processing in a second example of a conventional image processing apparatus.

FIG. 12 is a block diagram illustrating a schematic configuration of a first example of a conventional image processing apparatus and a flow of image processing.

[Explanation of symbols]

 1 CPU (means for developing, transferring and measuring) 2 ROM developing and measuring means 3 RAM (means for developing and measuring) 4 Host computer (image input means) 5 External interface (image input means) 6 segment image memory (second image memory) 7 address generator (transfer means) 8 image forming unit 9 disk controller 10 hard disk (first image memory)

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B41J 5/30 G06T 1/60

Claims (10)

(57) [Claims] 1. A image processing apparatus connected to the input image data to the image forming unit to be recorded on a recording medium, an image input unit for inputting the coded image data, is input Developing means for developing the coded image data into raster image data; a first image memory holding the coded image data comprising a plurality of segments corresponding to at least one page; Raster with fewer than minutes segments
A second image memory for holding image data; and a transfer unit for calling the raster image data from the second image memory and transferring the raster image data to the image forming unit, wherein the coded image corresponding to a predetermined segment is provided. The image data stored in the first image memory in units of the segments.
Raster image that has been developed by the
The image data is held in the second image memory and held.
The raster image data is transferred to the image forming unit by the transfer unit.
And sequentially encoded in the segment unit.
To repeat the process from reading the image data to transferring it.
An image processing apparatus , comprising: a control unit for controlling the image processing apparatus. 2. An image processing apparatus according to claim 1, wherein, when the number of pages of the raster image data to be output to the image forming unit 1, the control means sequentially the segment
Reading the coded image data on a per-mentment basis
If the controls to repeat until transfer, the number of pages of the image data to be output to the image forming section is at least 2, the control means, the expansion
Raster image data recorded in the first image memory
And transferred to the second image memory in segment units,
An image processing apparatus, further comprising: a mode in which an image is formed on a recording medium by repeating transfer from the second image memory to the image forming unit. 3. The image processing apparatus according to claim 1, wherein the time required to develop one page of the coded image data into the raster image data by the developing means and one page. An image processing apparatus for measuring the time required to transfer the raster image data to the second memory. The image processing apparatus of the claim 3, wherein the code stores the said coded image data and the raster image data in the first image memory
In the case of measuring the development time from rasterized image data to the raster image data and outputting the raster image data for one page,
The image data is transferred from the first image memory to the image forming unit via the second image memory for each of the segments constituting the raster image data for the plurality of segments constituting the one page. And forming the one page of raster image data on the recording medium by repeating the above steps, and transferring the one page of raster image data from the first image memory to the second image memory. A first recording mode for measuring time; and further, when outputting the raster image data for at least two pages, comparing the development time with the transfer time. If the transfer time is shorter, the first print mode is used. the recording mode was performed, when towards the deployment time is short constituting one page the raster image data stored in the first image memory The one-page raster image data is formed on the recording medium by repeating the transfer of the plurality of segments to be developed to the second image memory and then to the image forming unit. Image processing apparatus. 5. The apparatus according to any one of claims 1 to 4, wherein the coded image data requiring deployment to the raster image data is image processing, characterized in Oh Rukoto in PDL apparatus. 6. The apparatus according to claim 1, wherein the coded image data that needs to be expanded into raster image data is compressed image data, and the raster image data is compressed. An image processing apparatus wherein image data is expanded to image data in a state before the compression is performed by expanding the data. 7. The image processing apparatus according to claim 1, wherein said second image memory is a semiconductor memory, and said first image memory is a non-semiconductor memory. apparatus. 8. The image processing apparatus according to claim 7, wherein said non-semiconductor memory is a magnetic disk memory. 9. An image processing apparatus according to claim 7, wherein said non-semiconductor memory is a magneto-optical disk memory. 10. The image processing apparatus according to claim 1, wherein the image forming unit generates bubbles in the ink by a film boiling phenomenon using thermal energy, and generates the bubbles. An image processing apparatus, which is a bubble jet printer that discharges ink based on the image.