WO2006072205A1 - Printing control method capable of reducing printing memory requirement - Google Patents

Printing control method capable of reducing printing memory requirement Download PDF

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Publication number
WO2006072205A1
WO2006072205A1 PCT/CN2005/002291 CN2005002291W WO2006072205A1 WO 2006072205 A1 WO2006072205 A1 WO 2006072205A1 CN 2005002291 W CN2005002291 W CN 2005002291W WO 2006072205 A1 WO2006072205 A1 WO 2006072205A1
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WO
WIPO (PCT)
Prior art keywords
segment
time
print
rasterization
printing
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PCT/CN2005/002291
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English (en)
French (fr)
Inventor
Zhihong Liu
Zhaoxiang Lin
Original Assignee
Peking University Founder Group Co., Ltd
Beijing Founder Electronics Co., Ltd.
Peking University
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Application filed by Peking University Founder Group Co., Ltd, Beijing Founder Electronics Co., Ltd., Peking University filed Critical Peking University Founder Group Co., Ltd
Priority to US11/813,384 priority Critical patent/US7995233B2/en
Priority to DE602005027000T priority patent/DE602005027000D1/de
Priority to JP2007549785A priority patent/JP2008526555A/ja
Priority to EP05822733A priority patent/EP1850220B1/en
Priority to AT05822733T priority patent/ATE502332T1/de
Publication of WO2006072205A1 publication Critical patent/WO2006072205A1/zh

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Classifications

    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06KGRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K15/00Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers
    • G06K15/02Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/12Digital output to print unit, e.g. line printer, chain printer
    • G06F3/1201Dedicated interfaces to print systems
    • G06F3/1202Dedicated interfaces to print systems specifically adapted to achieve a particular effect
    • G06F3/1203Improving or facilitating administration, e.g. print management
    • G06F3/1204Improving or facilitating administration, e.g. print management resulting in reduced user or operator actions, e.g. presetting, automatic actions, using hardware token storing data
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/12Digital output to print unit, e.g. line printer, chain printer
    • G06F3/1201Dedicated interfaces to print systems
    • G06F3/1202Dedicated interfaces to print systems specifically adapted to achieve a particular effect
    • G06F3/1211Improving printing performance
    • G06F3/1217Improving printing performance achieving reduced idle time at the output device or increased asset utilization
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/12Digital output to print unit, e.g. line printer, chain printer
    • G06F3/1201Dedicated interfaces to print systems
    • G06F3/1202Dedicated interfaces to print systems specifically adapted to achieve a particular effect
    • G06F3/1218Reducing or saving of used resources, e.g. avoiding waste of consumables or improving usage of hardware resources
    • G06F3/122Reducing or saving of used resources, e.g. avoiding waste of consumables or improving usage of hardware resources with regard to computing resources, e.g. memory, CPU
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/12Digital output to print unit, e.g. line printer, chain printer
    • G06F3/1201Dedicated interfaces to print systems
    • G06F3/1223Dedicated interfaces to print systems specifically adapted to use a particular technique
    • G06F3/1237Print job management
    • G06F3/1244Job translation or job parsing, e.g. page banding
    • G06F3/1245Job translation or job parsing, e.g. page banding by conversion to intermediate or common format
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06KGRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K15/00Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers
    • G06K15/02Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers
    • G06K15/18Conditioning data for presenting it to the physical printing elements
    • G06K15/1801Input data handling means
    • G06K15/1825Adapting the print data to an output condition, e.g. object trapping
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06KGRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K15/00Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers
    • G06K15/02Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers
    • G06K15/18Conditioning data for presenting it to the physical printing elements
    • G06K15/1848Generation of the printable image
    • G06K15/1849Generation of the printable image using an intermediate representation, e.g. a list of graphical primitives
    • G06K15/1851Generation of the printable image using an intermediate representation, e.g. a list of graphical primitives parted in a plurality of segments per page
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06KGRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K15/00Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers
    • G06K15/02Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers
    • G06K15/18Conditioning data for presenting it to the physical printing elements
    • G06K15/1848Generation of the printable image
    • G06K15/1856Generation of the printable image characterized by its workflow
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06KGRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K15/00Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers
    • G06K15/02Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers
    • G06K15/18Conditioning data for presenting it to the physical printing elements
    • G06K15/1848Generation of the printable image
    • G06K15/1856Generation of the printable image characterized by its workflow
    • G06K15/1861Generation of the printable image characterized by its workflow taking account of a limited available memory space or rasterization time
    • G06K15/1863Generation of the printable image characterized by its workflow taking account of a limited available memory space or rasterization time by rasterizing in sub-page segments

Definitions

  • Print control method capable of reducing print memory requirement
  • the invention belongs to the technical field of printing control, and particularly relates to a printing control method capable of reducing the requirement of printing memory. Background technique
  • the entire workflow of a conventional raster printing device for printing a page can be divided into three parts: first, receiving print data from the host; then rasterizing the print data into a raster lattice; finally transmitting the raster dot matrix to the print engine output. .
  • the raster lattice must be supplied to the printer engine at a fixed speed because the printer engine must transfer the raster lattice to the print drum at a constant speed, once the grating If the dot matrix cannot be transferred to the printer engine in time, a so-called pr int overrun error occurs and the page cannot be correctly output to the paper.
  • the printing control methods are as follows:
  • Another common method is to divide a page into several segments, first interpreting the page data into an intermediate format arranged in segments, and the data in the intermediate format is easily converted into the final raster lattice, and The memory of this intermediate format usually occupies much less than the raster dot matrix of the page.
  • the printer can start printing after rasterizing one segment.
  • the raster dot matrix of the next segment is generated in real time, which can improve Printing speed, and does not require a large amount of memory to store a full page of raster lattice, but the shortcoming of this method is that once a certain segment of data is complex, the printer is likely to be unable to print at the previous paragraph The rasterization of the segment is completed in time, thus causing a pr int overrun error and the page will not output correctly.
  • the current common method is to pre-calculate the required rasterization time for each segment. If the rasterization time exceeds a segment of the printing time, the segments are pre-rasterized and then printed. It is guaranteed that pr int overrun will not be generated.
  • the shortcoming of this method is that pre-rasterizing all segments over a period of printing time requires a certain amount of memory to store the pre-rasterized dot matrix, which requires the printer to have a larger Memory, also often Will cause an increase in controller costs.
  • the method only utilizes the rasterization idle time of the adjacent upper segment, and does not make full use of all the single-segment and pre-rasterized segments. Idle time, so there is no guarantee that the number of pre-rasterized segments needs to be minimized, so that the print memory requirements cannot be reduced most effectively.
  • a printing control method capable of reducing the requirement of print memory comprising the following steps:
  • the printing device receives print data from the host through the interface
  • a segment of the rasterization time TR required for all print times TP is smaller than the intermediate format data, defined as a complex segment;
  • a segment of the rasterization time TR required for all print times TP greater than or equal to the intermediate format data is defined as a simple segment
  • is the time required to print a segment
  • step (10) If there is no complicated segment that has not been marked yet, proceed to step (10);
  • the end rasterization time of the update processing segment is the segment number of the segment whose last print idle time is not 0 before the processing segment, and the processing segment is marked;
  • step (9) deleting the time taken by the processing segment rasterization from the print idle time information, and transferring to step (5);
  • step (10) start the print job and start printing the page until the end of the print. Further, the method of updating the start rasterization time of all complex segments in step (10) in the above step G includes the following steps:
  • step 4 If there is no marked complex segment, the step ends; otherwise, the segment with the largest rasterization time in the marked complex segment is selected as the processing segment;
  • step 10 Delete the time taken by the rasterization of the processed segment from the idle time, cancel the mark of the processed segment, and go to step 4). Further, for the start rasterization time of one segment calculated in step (6) of step G and step 5) in step (10), the segment to be initialized here is referred to as a processing segment, and the detailed steps are as follows :
  • the initialization takes time to process the rasterization time of the segment, and the current segment is equal to the processing segment; b) determine whether the segment number of the current segment is less than 2, and if so, the processing segment must be preprocessed, and the processing segment begins.
  • the rasterization time is -1, the step ends, otherwise, the next step is continued; c).
  • the print idle time of the previous segment corresponding to the current segment is subtracted from the required time;
  • step d If the print idle time is greater than 0, set the new current segment to the previous segment of the original current segment, and proceed to step b), otherwise, proceed to the next step; e) Set the start rasterization time of the processing segment to the absolute value of the time required to add the rasterization time to the previous segment of the current segment. Further, the time taken by the rasterization of the deletion processing segment described in the step (9) and the step (1 0) in the above step G is as follows:
  • the initialization takes time for the rasterization time of the processing segment, and the current segment is the processing segment; b) subtracts the printing idle time of the previous segment corresponding to the current segment from the required time;
  • step H If the required time is greater than 0, set the print idle time of the previous segment corresponding to the current segment to 0, set the new current segment to the previous segment of the original current segment, and proceed to step b), otherwise, continue to the next step; d) Set the print idle time corresponding to the previous segment of the current segment to the absolute value of the time required for rasterization. Further, in the above step H), the printing task is started, and the printing task is mainly used to complete the printing work, and the detailed steps are as follows:
  • the main print task rasterizes the segment at the beginning of the rasterization of the single segment
  • the effect of the invention is to use the printing control method of the invention to fully utilize all the simple segments and the rasterization idle time of the pre-rasterized segments to rasterize the complex segments, so that the segments that need to be rasterized before printing start are minimized, thereby reducing The need for print memory.
  • Figure 1 is a schematic diagram of a print control method
  • Figure 2 is a schematic diagram of a page to be printed and how to divide it into N segments;
  • Figure 3 is a flow chart of the printing process steps
  • FIG. 4 is a flow chart showing the main steps of the present invention for determining the rasterization time
  • Figure 5 is a timing diagram for determining the start of a segment
  • Figure 6 is a diagram showing the rasterization occupation time of the processed segment from the idle time
  • Figure 7 is a diagram showing the start rasterization time of all segments
  • Figure 8 is a schematic diagram of the main print job
  • Figure 9 is a schematic diagram of the parallel operation of the main print task and the auxiliary print task during printing. detailed description
  • FIG. 1 depicts a principle of a printing control method and various components of a laser printer according to the present invention, which includes a host interface 11, a CPU 13, a ROM 16, a DRAM 12, and a print control unit 14, and a printer engine 15.
  • the host interface 11 can be a parallel port, a network, a USB, etc.
  • the printer receives data to be printed from the computer 10 through the host interface 11
  • the CPU 13 is a central control unit in the printer
  • the ROM 16 is used to store programs and fonts
  • the DRAM 12 is The program run space and the buffer of the raster dot matrix are provided
  • the print control unit 14 is responsible for controlling the printing operation of the printer engine 15, and the printer engine 15 can transfer the raster dot matrix onto the paper.
  • the time required for the printer to print a page is T seconds, the printing of each segment can be calculated. Time TP - T / N, it can be considered that TP is the time left to the printer to generate the next raster lattice. If the raster lattice of the next segment cannot be obtained within TP time, a Pr int Overrun error will be generated.
  • the present invention relates to a print control method capable of reducing print memory requirements, and the specific implementation scheme is as follows:
  • the printer receives a page description language from the computer 10 via the host interface 11
  • the final raster lattice is relatively easy to derive from these intermediate format instructions, and these instructions have been stored in different segments according to their position on the page.
  • the size of the intermediate format command for the entire page is much smaller than the final raster.
  • the size of the dot matrix is much smaller.
  • TendRaster is the time at which the segment starts printing, and starts the rasterization time.
  • TbeginRaster is the end rasterization time of the segment TendRaster minus the rasterization time TR of the segment;
  • the end rasterization time of the update processing segment TendRaster is the segment number of the segment in which the last print idle time is not 0 before the processing segment;
  • the above process calculates which segments may be arranged in the auxiliary task, marks all segments that can be inserted into the scheduling sequence, and begins to update the start rasterization moments of all segments.
  • the detailed steps of the process will be described in FIG. As shown in Figure 5, the start rasterization time of the processing segment is determined, and the detailed steps are as follows:
  • Initialization time required Time is the rasterization time of the processing segment
  • step (3) subtracting the print idle time of the previous segment corresponding to the current segment from the required time Time; (4) determining whether the required time Time is less than 0, and if so, setting the start rasterization time of the processing segment to the beginning of the previous segment of the current segment The printing time plus the absolute value of the time required time, otherwise, set the new current segment to the previous segment of the current segment's rasterization start time, determine whether the segment number of the current segment is less than 2, and if so, set the start raster of the processing segment The time is -1 and the step ends, otherwise proceed to step (3).
  • the rasterization time occupied by the processed segment is deleted, and the detailed steps are as follows: (1) Initialization required time Time is the rasterization time of the processing segment;
  • the printer engine prints the segments in the current print buffer
  • FIG. 9 depicts a simplified example of an embodiment of the present invention, showing a schematic diagram of the main print job and the auxiliary print job and the printer engine running in parallel during the printout.
  • the example shown in Figure 9 assumes that the page is divided into six segments, where the first, second, and fourth segments are simple segments, and the rasterization time is 0.5Tp, 0.5 ⁇ , ⁇ , Tp, which is the time required to print a segment, and the third. , 5, 6 segments are complex segments, the rasterization time is 1.25 ⁇ ⁇ , 1.25 ⁇ ⁇ , 3.25 ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ The rasterization starts at the time of 1.75 Tp after the start, and the third segment starts rasterization in the auxiliary task and immediately after the start of printing.
  • the main print task starts an auxiliary print task with a lower priority than the main print task to rasterize the third and fifth segments.
  • the main print task first rasterizes all non-real-time rasterized segments, ie, segment 6, and then rasterizes 1 paragraph.
  • the auxiliary print task starts to rasterize the third segment, 0.5 T P after the first segment starts printing, the auxiliary print task is suspended, and the main print task starts to rasterize the second segment.
  • the printer engine is started to print the second segment, and the auxiliary print task continues to rasterize the third segment.
  • the third segment completes the rasterization at the time of the 0.75 Tp after the second segment starts printing, and then the auxiliary print task continues to rasterize the fifth segment.
  • the main print task starts the printer engine to print the third segment, and then starts rasterizing the fourth segment.
  • the main print task starts the printer engine to print the fourth paragraph. Because the fifth segment is a complex segment, the rasterization is not completed in the main print task, and the main print task is idle.
  • the main print task starts the printer engine to print the fifth paragraph. Because the sixth paragraph of the next paragraph is a complex segment, it is not rasterized in the main print task, and the main print task is idle.
  • the main print task starts the printer engine to print the sixth paragraph.
  • the page print ends.
  • the existing printing technology generally needs to pre-rasterize the ⁇ 1, 3, 5, and 6 segments before starting printing.
  • the present invention only the ⁇ 1, 6 segments can be rasterized.
  • the rasterization of the third and fifth segments can be performed at the same time as printing, so that the memory required for printing is reduced.
  • the above description is only one of the embodiments of the present invention and is not intended to limit the present invention.
  • the embodiment of the present invention is described by a laser printer, but the present invention is equally applicable to some inkjet printers, laser imagesetters, and the like.
  • a printing apparatus for printing a raster dot matrix, and thus any modifications, equivalents, improvements, etc., made within the spirit and principles of the present invention are intended to be included in the scope of the present invention.

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Description

一种能够减少打印内存需求的打印控制方法
技术领域
本发明属于打印控制技术领域, 具体涉及一种能够減少打印内存需求的 打印控制方法。 背景技术
现有技术中, 通常的光栅打印设备打印一页的整个工作流程可分为三部 分: 首先从主机接收打印数据 ; 然后将打印数据光栅化成光栅点阵; 最后 将光栅点阵传送到打印引擎输出。
对于某些光栅打印设备如采用激光成像技术的打印机, 光栅点阵必须以 固定的速度提供给打印机引擎, 因为打印机引擎必须以固定不变的速度将光 栅点阵转印到打印鼓上, 一旦光栅点阵不能及时传送到打印机引擎, 则会发 生所谓的打印越界(pr int overrun ) 的错误, 页面不能正确的输出到纸上。
通常,对于光栅点阵以固定速度提供给打印机引擎的光栅打印设备而言, 打印控制方法有如下几种:
( 1 )预先光栅化一页点阵完毕, 将光栅点阵存放在内存中, 然后再开始 打印, 采用此种方法, 因为光栅点阵存在内存中, 可以保证不会发生 pr int overrun的错误, 但是, 这种方法不足之处在于对于高分辨率的光栅打印设 备,通常需要很大的内存,对于彩色打印机则更加如此,如存储一个 A4幅面, 600DPI的 CMYK彩色页面, 大约需要 16MB的内存, 这会大大增加打印机的成 本; 另外, 这种方法需要完成光栅化一个完整页面后才能开始打印, 这往往 会降低打印速度。
( 2 )另外一种常见的方法是将一个页面分为若干段,先将页面数据解释 成为一种按段安排的中间格式, 这种中间格式的数据比较容易转化为最终的 光栅点阵,而且这种中间格式的数据所占内存通常大大小于页面的光栅点阵, 打印机先光栅化一段就可以开始打印, 在上一段打印的过程中同时进行下一 段的光栅点阵实时产生, 这样既能提高打印速度, 又不需要很大的内存来存 放一个完整页面的光栅点阵, 但是, 这种方法的不足之处在于一旦有某一段 的数据很复杂, 打印机很可能不能够在上一段打印的时间内及时完成该段的 光栅化, 因而会产生 pr int overrun的错误, 页面将不能正确输出。
为了防止打印越界错误的产生, 目前通常的方法是预先计算每一段所需 要的光栅化时间, 如有光栅化时间超过一段打印时间的段, 则将这些段预先 光栅化, 再开始打印, 这样可以保证不会产生 pr int overrun, 但是, 该方 法的不足之处在于预先光栅化所有的超过一段打印时间的段需要占用一定的 内存来存放预先光栅化完毕的点阵, 这会要求打印机有较大的内存, 也往往 会引起控制器成本的增加。
在此基础上,又出现了一些改进的方法,如惠普公司在美国专利 5129049 中提出的方法, 该方法的原理是如果某一段的内容很简单或者该段的内容已 经预先光栅化完毕,则该段打印时并不需要一个段的打印时间来光栅化该段, 其中的空闲时间则可以用来光栅化下一段, 这样, 有可能下一段的光栅化时 间可以大于一段打印时间而不需要预先光栅化, 所以该方法能在一定程度上 减少预先光栅化段的数目, 但是, 该方法只利用了相邻的上一段的光栅化空 闲时间, 没有充分利用所有筒单段及预先光栅化段的光栅化空闲时间, 因此 并不能保证需要预先光栅化段的数目为最少, 从而不能最有效的减少打印内 存需求。 发明内容
针对现有技术中存在的缺陷, 本发明的目的是提供一种更先进的能够減 少打印内存需求的打印控制方法, 该方法可以在打印的同时最大限度地充分 利用所有简单段及预先光栅化段的光栅化空闲时间来光栅化复杂段, 使打印 开始前需要预先光栅化的段最少, P争低了复杂页面的内存需求。 为达到以上目的, 本发明采用的技术方案是: 一种能够减少打印内存需 求的打印控制方法, 包括以下步骤:
A ) .打印设备通过接口从主机接收打印数据;
B ) .根据页面大小、 打印速度等参数确定每页所分的段的数目及每段打 印时间 TP;
C ) .将打印数据解释成按段组成的中间格式的数据;
D ) .计算每一段中间格式数据所需要的光栅化时间 TR;
E ).对所有打印时间 TP小于中间格式数据所需要的光栅化时间 TR的段, 定义为复杂段;
F ) .对所有打印时间 TP 大于或等于中间格式数据所需要的光栅化时间 TR的段, 定义为简单段;
G ) .确定每个段的开始光栅化时刻, 具体步骤是:
( 1 )初始化每一段的开始打印时刻为 Tp乘以该段的段号减去 1 , 其中
Τρ是指打印一个段需要的时间;
( 2 )设置所有段的结束光栅化时刻为该段的开始打印的时刻,对于所有 简单段, 设置其开始光栅化时刻为该段的结束光栅化时刻减去该段的光栅化 时间 TR;
( 3 )初始化每个段的打印空闲时间为该段的打印时间 TP;
( 4 )对于除了笫一段的所有的简单段,从打印空闲时间里面减去光栅化 该筒单段占用的时间, 具体方法为从该简单段的前一段的打印空闲时间里面 减去该段的光栅化时间;
( 5) 如果不存在还没有被标记的复杂段,则转入步骤(10) ;
( 6 )对于所有还没有被标记的复杂段,设置其开始光栅化时刻;
(7) 选择开始光栅化时刻最大并且还没有被标记的一个段作为处理段, 如果该段的开始光栅化时刻小于 0, 步骤结束;
( 8 )更新处理段的结束光栅化时刻为在处理段之前最后一个打印空闲时 间不为 0的段的段号, 对处理段作标记;
( 9 )从打印空闲时间信息中删除处理段光栅化所占用的时间,转入步骤 ( 5) ;
( 10) 更新所有复杂段的开始光栅化时刻;
H) . 启动打印任务, 开始打印页面直至打印结束。 更进一步,上述步骤 G中第 (10) 步中更新所有复杂段的开始光栅化时刻 的方法包括以下步驟:
I)对于所有没有被标记的复杂段,设置其开始光栅化时刻为- 1, 表示需 要预处理;
2 )初始化每个段的打印空闲时间为该段的打印时间;
3 )对于除了第一段的所有的筒单段,从打印空闲时间里面减去被它们占 用的光栅化时间, 具体方法为从该段的前一段的打印空闲时间里面减去该段 的光栅化时间;
4)如果不存在被标记的复杂段,步驟结束, 否则选择被标记的复杂段中 结束光栅化时刻最大的段作为处理段;
5)计算处理段的开始光栅化时刻;
6 )从空闲时间中删除被处理段光栅化占用的时间, 取消处理段的标记, 转入步骤 4 ) 。 更进一步, 对于上述步驟 G中第 (6)步、 步骤(10) 中第 5)步中所述的 计算一个段的开始光栅化时刻, 这里将要初始化的段称为处理段, 其详细步 驟如下:
a) .初始化需要时间为处理段的光栅化时间,设置当前段等于处理段; b) .判断当前段的段号是否小于 2,如是, 则说明处理段必须被预处理, 初始化处理段的开始光栅化时刻为 -1, 步驟结束, 否则, 继续下一步骤; c) .从需要时间中减去当前段对应的前一段的打印空闲时间;
d).如果打印空闲时间大于 0, 设置新的当前段为原来当前段的前一段, 转入步骤 b) , 否则, 继续下一步骤; e)设置处理段的开始光栅化时刻为当前段的前一段开始打印时刻加上光 栅化需要时间的绝对值。 更进一步, 上述步骤 G中第 (9 )步、 步骤(1 0 ) 中第 6 )步中所述的删除 处理段光栅化所占用的时间, 其详细步骤如下:
a) .初始化需要时间为处理段的光栅化时间,设覃当前段为处理段; b) .从需要时间中减去当前段对应的前一段的打印空闲时间;
c) .如果需要时间大于 0 , 设置当前段对应前一段的打印空闲时间为 0,设 置新的当前段为原来当前段的前一段,转入步驟 b) , 否则, 继续下一步骤; d) .设置当前段对应前一段的打印空闲时间为光栅化需要时间的绝对值。 进一步, 上述步骤 H ) 中启动打印任务, 打印任务的主要用于完成打印 工作, 其详细步骤如下:
( 1 )将所有开始光栅化时刻为- 1的段预先光栅化;
( 2 )如果存在开始光栅化时刻大于 0的复杂段段,则启动一个优先级低 于主打印任务的辅助任务在每个复杂段的开始光栅化时刻开始光栅化相应的 复杂段; '
( 3 )将第 1段光栅化并将点阵传送到打印点阵緩冲区;
( 4 ) 启动打印机引擎打印当前打印緩冲区中的段;
( 5 )如果下一个要打印的段是简单段, 则主打印任务在该筒单段的开始 光栅化时刻光栅化该段;
( 6 )获取下一段的光栅点阵,并将点阵传送到打印点阵緩冲区;
( 7 )打印引擎开始打印下一段;
( 8 ) 重复步骤 (5 ) 、 步骤(6 ) 、 步驟 (7 ) 直到页面打印完毕。 本发明的效果在于采用本发明所述的打印控制方法, 充分利用所有简单 段及预先光栅化段的光栅化空闲时间来光栅化复杂段, 使打印开始前需要预 先光栅化的段最少, 从而降低了对打印内存的需求。 附图说明
图 1是打印控制方法原理图;
图 2 是一个要打印的页面及如何将它分为 N段的示意图;
图 3 是打印处理步驟的流程框图;
图 4 是本发明主要步骤确定光栅化时间的流程框图;
图 5 是确定一个段的开始光栅化时刻图;
图 6 是从空闲时间里面删除被处理段光栅化占用时间图; 图 7 是更新所有段的开始光栅化时刻图;
图 8 是主打印任务示意图;
图 9 是打印过程中主打印任务和辅助打印任务并行运行的示意图。 具体实施方式
下面结合说明书附图对本发明作进一步地描述:
如图 1所示, 图 1描述了一个本发明所涉及的打印控制方法的原理及激 光打印机的各组成部分, 它包括一个主机接口 11 , CPU13 , R0M16 , DRAM12 及打印控制单元 14 ,打印机引擎 15等部分,主机接口 11可以是并口, 网络, USB等,打印机通过主机接口 11从计算机 10接收要打印的数据, CPU13是打 印机中的中央控制单元, ROM 16用来存放程序及字库等, DRAM12则提供程序 运行空间及光栅点阵的緩冲, 打印控制单元 14负责控制打印机引擎 15的进 行打印工作, 打印机引擎 15则可以将光栅点阵转印到纸上。 如图 2所示, 激光打印机将要打印的页面在逻辑上按走纸的方向分为若 干段, 如 N ( N>=2 )段,每一段包含相同的扫描线, 如 M线, 如果一个页面线 数不是正好等于 N*M,则最后一段线数小于 M, 容易得知这不影响本发明的有 效性, 假设打印机打印一页的需要的时间为 T秒, 则可以计算出每一段的打 印时间 TP - T/N, 可以认为 TP为留给打印机产生下一段光栅点阵的时间, 如 果在 TP的时间内, 不能得到下一段的光栅点阵, 则会产生 Pr int Overrun错 误。 如图 3所示,本发明涉及的一种能够减少打印内存需求的打印控制方法, 具体实现方案如下:
首先, 打印机通过主机接口 11从计算机 10接收用页面描述语言如
Pos tScr ipt或 PCL来描述的页面信息, 这些信息存放在 DRAM12。 接着, 存放 在 R0M16中的程序将按走纸方向, 根据页面大小, 打印速度, 内存大小, CPU 速度等参数来确定将要打印的页面分为多少段, 如 N段, 按走纸方向, 每一 段依次命名为段 1,段 2, 段 3......段^ 并且根据打印一页的时间 T, 计算出 ΤΡ = Τ/Ν为一段的打印时间。 接着, 对页面信息中的内容如文字, 图形等进 行解释, 将它们变成一系列比较简单的中间格式指令。 从这些中间格式指令 比较容易得出最终的光栅点阵, 并且这些指令已经按照它们在页面上的位置 被存放在不同的段中, 通常, 整个页面的中间格式命令的大小会远远小于最 终光栅点阵的大小。
下一步, 对所有的段, 根据该段中包含的中间格式命令内容计算该段中 中间格式命令光栅化为最终的光栅点阵需要的时间。 对于第 I段, 这个时间 表示为 TR[I]。 .
对于所有的段 I, 比较该段的 TR与 TP , 如果 TP < TR[I] , 则将该段 定义为复杂段, 否则定义为简单段并标记。
接着, 确定每个段将在什么时刻开始光栅化, 确定的方法如图 4所示的 伴细介绍。
最后, 启动打印任务, 开始页面打印,打印任务如图 6所示的详细描述。 如图 4所示, 上述方法中确定的每个段将在什么时刻开始光栅化, 包含 以下步骤:
(1) 初始化每一段的开始打印时刻, 记第一段开始打印时刻为 0, 其他 段开始打印时刻为 Τρ乘以该段的段号减去 1;
(2)确定筒单段的开始光栅化时刻, 对于所有简单段, 设置其结束光栅 化时刻 TendRaster为该段的开始打印的时刻, 其开始光栅化时刻
TbeginRaster为该段的结束光栅化时刻 TendRaster减去该段的光栅化时间 TR;
(3) 初始化空闲时间区域信息,首先, 初始化每个段的打印空闲时间为 该段的打印时间 TP, 对于除了第一段的所有的简单段, 从打印空闲时间里面 减去被它们占用的光栅化时间, 具体方法为从该段的前一段的打印空闲时间 里面减去该段的光栅化时间;
Figure imgf000008_0001
(5)检查是否有复杂段还没有被标记, 如果没有, 则转入更新所有段的 开始光栅化时刻;
( 6 )如果存在复杂段还没有被标记, 则初始化所有还没有被标记的复杂 段的开始光栅化时刻,一个段的开始光栅化时刻 TBeginRaster是指假设该段 可以利用空闲时间区域信息里面的所有空闲时间, 为了在该段的结束光栅化 时刻 TEndRaster之前完成光栅化, 即它最迟应该开始光栅化的时刻,其详细 方法如图 5的描述;
(7) 选择还没有被标记的段中, 开始光栅化时刻最大的段作为处理段; (8)如果处理段的开始光栅化时刻小于 0, 则转入更新所有段的开始光 栅化时刻;
( 9 )否则, 更新处理段的结束光栅化时刻 TendRaster为在处理段之前最 后一个打印空闲时间不为 0的段的段号;
(10)对处理段作标记;
(11) 更新空闲时间区域信息, 从空闲时间区域中删除被处理段占用的 时间, 该操作在图 6中详细说明, 然后转到步驟(5)检查是否还有段需要处 理;
上述过程计算有哪些段可能被安排在辅助任务, 在将所有能被插入到调 度序列的段作标记, 开始更新所有段的开始光栅化时刻, 该过程的详细步骤 将在图 7中描述。 如图 5所述,确定处理段的开始光栅化时间,其详细步驟如下所述:
( 1 )初始化需要时间 Time为处理段的光栅化时间;
( 2 )设置当前段等于处理段, 然后, 判断当前段的段号是否小于 2 , 如 果是, 则设置处理段的开始光栅化时刻为 -1, 步骤结束, 否则继续进入下一 步驟;
( 3 )从需要时间 Time中减去当前段对应的前一段的打印空闲时间; ( 4 ) 判断需要时间 Time是否小于 0 , 如果是, 设置处理段的开始光栅化 时刻为当前段的前一段开始打印时刻加上需要时间 Time的绝对值, 否则, 设 置新的当前段为原来当前段的光栅化开始时刻前一段, 判断当前段的段号是 否小于 2 , 如果是, 则设置处理段的开始光栅化时刻为 -1 , 步驟结束, 否则继 续进入步驟 ( 3 ) 。 如图 6所述, 删除被处理段占用的光栅化时间, 其详细步驟如下: ( 1 )初始化需要时间 Time为处理段的光栅化时间;
( 2 )设置当前段等于处理段, 然后从需要时间 Time中减去当前段对应的 前一段的打印空闲时间;
( 3 )判断需要时间 Time是否大于 0, 如果小于 0, 设置当前段对应前一段 的打印空闲时间为需要时间 Time的绝对值, 步骤结束, 否则, 设置当前段对 应前一段的打印空闲时间为 0 ,设置新的当前段为原来当前段的前一段,从需 要时间 Time中减去当前段对应的前一段的打印空闲时间,' 然后继续。 如图 7所述, 更新所有复杂段的开始光栅化时刻。该过程对于没有被标记 的复杂段设置为预处理; 对于被标记的复杂段,按照图 4中确定的结束光栅化 时刻的先后顺序, 安排复杂段的光栅化过程, 所有调度序列中的复杂段在保 证它后面的段有足够光栅化时间的前提下尽可能迟的光栅化。 一种可供参考 的步驟如图 7所示:
( 1 )将所有没有被标记的复杂段标记为需要预处理,将其开始光栅化时 刻置为- 1 ;
( 2 )初始化空闲时间区域信息, 其方法为: 首先, 初始化每个段的打印 空闲时间为该段的打印时间 TP, 对于除了第一段外的所有的筒单段, 从打印 空闲时间里面减去被它们占用的光栅化时间, 具体方法为从该段的前一段的 打印空闲时间里面减去该段的光栅化时间;
( 3)如果不存在被标记的复杂段, 则结束, 否则, 继续下一步;
( 4 )选择被标记的复杂段中结束光栅化时刻 TendRaster最大的段作为处 理段;
( 5)计算处理段开始光栅化时刻, 具体方法在图 5中描述;
( 6) 更新空闲时间信息, 删除被处理段光栅化所占用的时间,其具体方 法在图 6中描述;
( 7)取消处理段的标记, 然后检查是否还存在被标记的复杂段。 如图 8所述,打印任务的详细步骤如下:
( 1 )初始化, 将所有标记为预处理的段预先光栅化;
( 2)如果存在没有被预处理的复杂段, 则创建一个辅助任务, 由该辅助 任务对没有被预处理的复杂段进行光栅化, 该辅助任务的的优先级低于主打 印任务, 只能在主打印任务空闲时运行;
( 3) 光栅化第 1段, 并将点阵传送到打印点阵緩冲区, 启动打印引擎;
( 4)打印机引擎打印当前打印緩冲区中的段;
( 5)判断是否是最后一段, 如是, 则打印结束; 否则, 判断下一段的类 型是否是简单段, 如果是则等待到该段的开始光栅化时刻光栅化该段, 再将 光栅点阵传送到打印点阵緩冲区, 如果不是, 则判断下一段的类型是否是已 经预处理的复杂段, 如是则从预先光栅化完毕的点阵中将光栅点阵传送到打 印点阵緩沖区, 否则, 等待辅助任务光栅化该段完毕, 再将光栅点阵传送到 打印点阵緩冲区。 图 9描述了一个本发明实施方案的简单示例, 给出了打印输出过程中主 打印任务和辅助打印任务及打印机引擎并行运行的示意图。
图 9所示的示例假设将页面分为 6段, 其中第 1, 2, 4段为简单段, 光 栅化时间分别为 0.5Tp, 0.5Τρ, ΙΤρ, Tp为打印一个段需要的时间, 第 3, 5, 6段为复杂段, 光栅化时间分别为 1.25Τρ, 1.25Τρ, 3.25ΤΡο 如果利用本发 明所述的方法, 第 6段被标示为预处理, 第 5段在辅助任务中于打印开始后 的 1.75个 Tp的时刻开始光栅化,第 3段在辅助任务中与打印开始后马上开始 光栅化。
打印开始时, 主打印任务启动一个优先级低于主打印任务的辅助打印任 务来光栅化第 3, 5段, 主打印任务先光栅化所有不可实时光栅化段即第 6 段, 然后光栅化第 1段。
启动打印机引擎打印第 1段,辅助打印任务开始光栅化第 3段,在第一段 开始打印后 0.5个 TP,辅助打印任务被挂起,主打印任务开始光栅化第二段。 当第 -1段打印完毕,主打印任务已经光栅化完第二段,启动打印机引擎打 印第 2段, 辅助打印任务继续光栅化第 3段。 第 3段在第二段开始打印后的 0. 75个 Tp的时刻完成光栅化, 接着, 辅助打印任务继续光栅化第 5段。
当第 2段打印完毕, 主打印任务则启动打印机引擎打印第 3段, 接着开 始光栅化第 4段。
当第 3段打印完毕, 主打印任务则启动打印机引擎打印第 4段, 因为第 5段为复杂段, 其光栅化不在主打印任务中完成, 主打印任务转入空闲。
当第 4段打印完毕, 主打印任务则启动打印机引擎打印第 5段, 因为下 一段第 6段为为复杂段, 不在主打印任务中光栅化, 主打印任务转入空闲。
当第 5段打印完毕, 主打印任务则启动打印机引擎打印第 6段。
当第 6段打印完毕, 页面打印结束。 如图 6所示例, 现有的打印技术通常需要将笫 1, 3, 5 , 6段都预先光栅 化完毕才能开始打印, 而采用本发明, 只需要将笫 1, 6段的光栅化即可开始 打印, 第 3, 5段的光栅化可以在打印的同时进行, 因而打印所需的内存得到 减少。 以上所述仅为本发明的其中一个实施例而已, 并不用以限制本发明, 如 以上用激光打印机来描述本发明实施例, 但本发明同样适用于某些喷墨打印 机, 激光照排机等采用光栅点阵进行打印的打印设备, 因而凡在本发明的精 神和原则之内, 所作的任何修改, 等同替换, 改进等, 均应包含在本发明的 保护范围之内。

Claims

权 利 要 求 书
1. 一种能够减少打印内存需求的打印控制方法, 包括以下步驟:
A ) .打印设备通过接口从主机接收打印数据;
B) ,确定每页所分的段的数目及每段打印时间;
C ) .将打印数据解释成按段组成的中间格式的数据;
D ) .计算每一段中间格式数据所需要的光栅化时间;
E) .对所有打印时间小于中间格式数据所需要的光栅化时间的段, 定义 为复杂段;
F ).对所有打印时间大于或等于中间格式数据所需要的光栅化时间的段, 定义为简单段;
G) .确定每个段的开始光栅化时刻, 设定第一段开始打印时刻为 0, 包 括以下步骤:
( 1)初始化每一段的开始打印时刻为 Tp乘以该段的段号减去 1, 其中 Tp是指打印一个段需要的时间;
( 2 )设置所有段的结束光栅化时刻为该段的开始打印的时刻,对于所有 简单段, 设置其开始光栅化时刻为该段的结束光栅化时刻减去该段的光栅化 时间 TR;
( 3)初始化每个段的打印空闲时间为该段的打印时间;
( 4)对于除了第一段的所有的简单段,从打印空闲时间里面减去光栅化 该筒单段占用的时间 , 具体方法为从该简单段的前一段的打印空闲时间里面 减去该段的光栅化时间;
( 5) 如果不存在还没有被标记的复杂段,则转入步骤(10) ;
( 6 )对于所有还没有被标记的复杂段,设置其开始光栅化时刻;
( 7) 选择开始光栅化时刻最大并且还没有被标记的一个段作为处理段, 如果该段的开始光栅化时刻小于 0, 步骤结束;
( 8 )更新处理段的结束光栅化时刻为在处理段之前最后一个打印空闲时 间不为 0的段的段号, 对处理段作标记;
( 9 )从打印空闲时间信息中删除处理段光栅化所占用的时间,转入步驟 ( 5) ;
( 10) 更新所有复杂段的开始光栅化时刻;
H) . 启动打印任务, 开始打印页面直至打印结束。
2. 如权利要求 1所述的一种能够减少打印内存需求的打印控制方法,其 特征在于步骤 H) 中启动打印任务, 打印任务的主要用于完成打印工作, 其 详细步骤如下: ( 1 )将所有开始光栅化时刻为- 1的段预先光栅化;
( 2 )如果存在开始光栅化时刻大于 0的复杂段段,则启动一个优先级低 于主打印任务的辅助任务在每个复杂段的开始光栅化时刻开始光栅化相应的 复杂段;
( 3 )将第 1段光栅化并将点阵传送到打印点阵緩冲区;
(4) 启动打印机引擎打印当前打印緩冲区中的段;
( 5)如果下一个要打印的段是筒单段, 则主打印任务在该简单段的开始 光栅化时刻光栅化该段;
( 6) 等待当前段打印结束, 获取下一段的光栅点阵,并将点阵传送到打 印点阵緩冲区;
(7) 打印引擎开始打印下一段;
(8) 重复步骤 (5) 、 步驟(6) 、 步驟 (7) 直到页面打印完毕。
3.如权利要求 1所述的一种能够减少打印内存需求的打印控制方法,其特 征在于步驟( 10)中更新所有复杂段的开始光栅化时刻的方法包括以下步骤:
1 )对于所有没有被标记的复杂段,设置其开始光栅化时刻为 -1, 表示需 要预处理;
2)初始化每个段的打印空闲时间为该段的打印时间;
3 )对于除了笫一段的所有的简单段,从打印空闲时间里面减去被它们占 用的光栅化时间, 具体方法为从该段的前一段的打印空闲时间里面减去该段 的光栅化时间;
4)如果不存在被标记的复杂段,步骤结束, 否则选择被标记的复杂段中 结束光栅化时刻最大的段作为处理段;
5) 计算处理段的开始光栅化时刻;
6 )从空闲时间中删除处理段光栅化占用的时间, 取消处理段的标记, 转 入步骤 4 ) 。
4.如权利要求 1或 3所述的一种能够减少打印内存需求的打印控制方法, 其特征在于步骤(6 ) 、 步骤(10) 中第 5) 步所述的计算一个段的开始光栅 化时刻, 这里将要初始化的段称为处理段, 其详细步骤如下:
a) .初始化需要时间为处理段的光栅化时间,设置当前段等于处理段; b) .判断当前段的段号是否小于 2,如是, 则说明处理段必须被预处理, 初始化处理段的开始光栅化时刻为 -1, 步骤结束, 否则, 继续下一步骤; c) .从需要时间中减去当前段对应的前一段的打印空闲时间;
d).如果打印空闲时间大于 0, 设置新的当前段为原来当前段的前一段, 转入步橡 b) , 否则, 继续下一步骤; e)设置处理段的开始光栅化时刻为当前段的前一段开始打印时刻加上光 栅化需要时间的绝对值。
5.如权利要求 1或 3所述的一种能够减少打印内存需求的打印控制方法, 其特征在于步驟 ( 9 ) 、 步骤(10 ) 中第 6 ) 所述的删除处理段光栅化所占用 的时间, 其详细步骤如下:
a) .初始化需要时间为处理段的光栅化时间,设置当前段为处理段; b) .从需要时间中减去当前段对应的前一段的打印空闲时间;
c) .如果需要时间大于 0, 设置当前段对应前一段的打印空闲时间为 0,设 置新的当前段为原来当前段的前一段,转入步骤 b) , 否则, 继续下一步骤; d) .设置当前段对应前一段的打印空闲时间为光栅化需要时间的绝对值。
PCT/CN2005/002291 2005-01-07 2005-12-23 Printing control method capable of reducing printing memory requirement WO2006072205A1 (en)

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