WO2008125046A1 - Procédé, système de télécopie et ordinateur de télécopie - Google Patents

Procédé, système de télécopie et ordinateur de télécopie Download PDF

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Publication number
WO2008125046A1
WO2008125046A1 PCT/CN2008/070641 CN2008070641W WO2008125046A1 WO 2008125046 A1 WO2008125046 A1 WO 2008125046A1 CN 2008070641 W CN2008070641 W CN 2008070641W WO 2008125046 A1 WO2008125046 A1 WO 2008125046A1
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WIPO (PCT)
Prior art keywords
line segment
image
fax
same color
color line
Prior art date
Application number
PCT/CN2008/070641
Other languages
English (en)
French (fr)
Inventor
Sridhar Dubbaka
Original Assignee
Huawei Technologies Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to EP08715374A priority Critical patent/EP2157778A4/en
Publication of WO2008125046A1 publication Critical patent/WO2008125046A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
    • H04N1/327—Initiating, continuing or ending a single-mode communication; Handshaking therefor
    • H04N1/32704—Establishing a communication with one of a facsimile and another telecommunication apparatus sharing a single line
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
    • H04N1/327—Initiating, continuing or ending a single-mode communication; Handshaking therefor
    • H04N1/32704—Establishing a communication with one of a facsimile and another telecommunication apparatus sharing a single line
    • H04N1/32715—Detecting
    • H04N1/32721—Detecting facsimile protocol signals, e.g. DCS or TSI
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
    • H04N1/327—Initiating, continuing or ending a single-mode communication; Handshaking therefor
    • H04N1/32765—Initiating a communication
    • H04N1/32769—Initiating a communication in response to detection of an original
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
    • H04N1/327—Initiating, continuing or ending a single-mode communication; Handshaking therefor
    • H04N1/32765—Initiating a communication
    • H04N1/32771—Initiating a communication in response to a request, e.g. for a particular document
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
    • H04N1/327—Initiating, continuing or ending a single-mode communication; Handshaking therefor
    • H04N1/32786—Ending a communication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
    • H04N2201/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
    • H04N2201/3285—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device using picture signal storage, e.g. at transmitter
    • H04N2201/329—Storage of less than a complete document page or image frame
    • H04N2201/3292—Storage of less than a complete document page or image frame of one or two complete lines

Definitions

  • the present invention relates to computer fax technology, and more particularly to a fax method, system and fax computer using computer fax technology. Background technique
  • Computer Fax Usually, a computer converts a fax file into a fax signal, and then sends it to the receiving fax machine via a wired network or a wireless network. The receiving fax machine restores the received signal to an image and prints it on paper.
  • the coding method in the facsimile method is: dividing the image into a combination of small black and white line segments, and then dividing each black and white small line segment into pixel points to obtain a pixel point set, and then encoding the above pixel point set.
  • the inventors have found at least the following disadvantages in the prior art in the process of implementing the present invention: If the image of the facsimile contains a large number of pixels, for example, an image of 1728 x 2200 pixels, including about 3.6 M pixels, and the number of images to be faxed When there are more, the memory space used to store these pixels is larger. When these pixels are encoded, the central processing unit (CPU) that occupies the fax machine has a large amount. Especially in a one-to-many fax system, the stability of the sending fax machine will be large due to memory and CPU resources, system stability is poor, and often crashes. Summary of the invention
  • Embodiments of the present invention provide a fax method, system, and fax computer using computer fax technology, which can save a fax computer CPU and memory resources, and have stable performance.
  • Embodiments of the present invention provide a method for sending a fax, including the following steps: Get the original image that needs to send a fax;
  • the same color line segment is encoded into a same color line segment coded image, and the same color line segment coded image is sent to the receiving end by fax.
  • An embodiment of the present invention provides a method for receiving a fax, including the following steps:
  • a fax system provided by an embodiment of the present invention includes: a sending fax computer and a receiving fax computer, wherein:
  • the transmitting fax computer is configured to convert the original image into a same color line segment, and encode the same color line segment into a same color line segment image, and then send the image to the receiving fax computer;
  • the receiving facsimile computer is configured to receive a homochromatic line segment encoded image from the transmitting facsimile computer, and decode the homochromatic line segment encoded image to obtain a facsimile image.
  • the embodiment of the invention further provides a fax computer, comprising:
  • An original image receiving unit configured to receive an original image that needs to send a fax
  • an original image decoding unit configured to convert the original image into a same color line segment set
  • a line segment encoding unit configured to perform line segment encoding on the same color line segment set to obtain a same color line segment coded image
  • a fax sending unit configured to send the same-color line segment encoded image by fax.
  • a fax receiving unit configured to receive a homochromatic line segment encoded image obtained by encoding the same color line segment; and a line segment decoding unit configured to decode the same color line segment encoded image to obtain a fax image.
  • the embodiment of the present invention directly encodes the same-color line segment, avoids using a pixel point to encode a memory space of a large-sized fax computer, and occupies more CPU, thereby improving the efficiency of the fax.
  • the fax system can be stably transmitted in one-to-many fax, and the stability of the fax system is improved, which reduces the occurrence of the fax computer downtime.
  • the memory is about 11 MB when the fax is sent by the dot pixel, and the fax is sent according to the technical solution of the embodiment of the present invention.
  • Occupy memory is about 0.4MB left Right. For the calculation time of the original image of 1728x2200, it takes about 19000 ms for the dot pixel to send a fax, and only 28 ms for the embodiment of the present invention.
  • FIG. 1 is a flow chart of a fax method according to an embodiment of the present invention.
  • FIG. 2 is a schematic diagram of implementation of line segment coding according to an embodiment of the present invention.
  • FIG. 3 is a schematic diagram of a line segment decoding implementation according to an embodiment of the present invention.
  • FIG. 4 is a block diagram of a facsimile system in accordance with an embodiment of the present invention. detailed description
  • a facsimile method includes the steps of: receiving an original image that needs to be sent a fax; decoding the original image into a same color line segment; and directly encoding the same color line segment and transmitting the same color line segment encoded image in a fax form.
  • the fax method specifically includes the following steps:
  • Step 102 The sending fax computer receives the original image that needs to be sent a fax.
  • the original image is a static image, such as a TIFF (Tagged Image File Format) file or a paper piece. If it is a TIFF format file, it can be encoded in 1D or 2D encoding format in T.4 T.6 encoding.
  • TIFF Tagged Image File Format
  • Step 104 The sending fax computer decodes the original image into the same color line segment.
  • the file format is compressed in the T.4 standard of the TIFF format file
  • decoding is performed in accordance with the standard compressed file format to convert the original image into black and white lines of the same color.
  • the image in the form of paper is read out in the form of a line segment of the same color.
  • the present embodiment is described by taking a black and white paper form as an example, and the input of the color file is similar, except that the color file needs to record the type of color.
  • Step 106 The sending fax computer encodes the same-color line segment into a same-color line segment encoded image, and sends the same as a fax.
  • the facsimile computer uses 1D encoding to describe an image with a combination of a series of small line segments, each of which has the same color.
  • Each image consists of multiple rows of data, each row consisting of a series of alternating black and white segments.
  • the 1D encoding replaces the length of each black line segment or white line segment with a specific bit code stream, and the end line symbol is also replaced with a specific bit code stream.
  • 2D coding is an extension of 1D coding.
  • the first line is coded in a 1D manner, and the subsequent n lines give the position offset of the endpoint of a certain line segment of the line relative to the corresponding end point of the previous line on the basis of the previous line. After decoding the 2D code, it is still a line segment.
  • the same color line segment is not further divided into pixel points, and the same color line segment is directly used to identify the original image, and the same color line segment is directly encoded.
  • the source image in 1D or 2D format needs to be decoded, and the decoded result is a series of black and white segments.
  • the line segments are not converted into point sets according to the conventional method, and the images are scaled and converted on the basis of the point set; instead, the currently decoded black and white lines are directly converted.
  • the black and white line segment set of the destination image is not further divided into pixel points, and the same color line segment is directly used to identify the original image, and the same color line segment is directly encoded.
  • the image scaling and conversion algorithms all find a pixel set of the source image used to calculate a pixel color of the target image according to the zoom feature. You can also use a similar method to find the set of destination pixels associated with the color of a source pixel. For example, for a bilinear Bilinear image processing algorithm, the correspondence between the source pixel and the destination pixel can be found using the method shown in the figure. If the original image is reduced by half, the pixels 1 and 2 of the original image correspond to the pixel 1 of the destination image, and if the image is doubled, the pixels 1 and 2 of the source image correspond to the pixels 1 to 4 of the destination image.
  • the result of the decoding is a series of small black and white segments.
  • the length of each small line segment of the destination image corresponding to the line segment of the original image is calculated, thereby obtaining a line segment set of the destination image, thereby obtaining a homochromatic line segment encoded image.
  • the image conversion can read the length value of the current line segment encoding, set the length value as the number of loops for line segment encoding, and encode the line segments in sequence according to the number of loops.
  • Step 108 The receiving fax computer receives the fax of the above-mentioned same-line segment encoded image.
  • Step 110 The receiving fax computer decodes the encoded image of the same color line segment to obtain a fax image.
  • decoding is performed according to the inverse process of encoding in step 106. If the original image is reduced by half, the pixels 1 and 2 of the original image correspond to the pixel 1 of the destination image, and if the image is doubled, the pixels 1 and 2 of the source image correspond to the pixels 1 to 4 of the destination image. It can be seen that the correspondence between the source pixel and the destination pixel changes with the change of the scaling factor.
  • the decoding result is a series of small black and white lines. Paragraph. The length of each small line segment of the destination image corresponding to the line segment of the original image is calculated, thereby obtaining a line segment set of the destination image, thereby obtaining a same color line segment facsimile image.
  • Step 112 The receiving fax computer stores the decoded fax image.
  • a facsimile computer with a storage function is taken as an example, and thus the step of storing the original image file is included.
  • the facsimile computer may not directly include the storage function, but directly processes and sends the fax.
  • Step 114 The receiving fax computer displays the decoded fax image.
  • a facsimile computer with a display function is taken as an example, and thus the step of displaying the original image is included.
  • the fax computer may also not include a display function for those skilled in the art.
  • Step 116 Receive a fax computer to print the decoded fax image.
  • a facsimile computer with a printing function is taken as an example, so that the step of printing the received facsimile image is included.
  • the fax computer may also not include a printing function for those skilled in the art.
  • the embodiment of the present invention directly encodes the same-color line segment, avoids using a pixel point to encode a memory space of a large-sized fax computer, and occupies more CPU, thereby improving the efficiency of the fax.
  • the fax system can be stably transmitted during one-to-many faxing, and the stability of the fax system is improved, which reduces the occurrence of fax computer downtime.
  • the memory is about 11 MB when the fax is sent by the dot pixel, and the fax is sent according to the technical solution of the embodiment of the present invention.
  • the memory usage is about 0.4MB.
  • the user can browse the image without having to print out the fax.
  • the user can temporarily not print the fax image without printing paper, and can store the above-mentioned fax image for a long time, which is convenient for the user.
  • a fax system including a sending fax computer 200 and a receiving fax computer 300.
  • the transmitting fax computer 200 is for transmitting a fax
  • the receiving fax computer 300 is for receiving a fax.
  • the transmitting fax computer 200 encodes the original image in the same color line segment and transmits it to the receiving fax computer 300.
  • the sending fax computer 200 further includes: an original image receiving unit 202, an original The initial image decoding unit 204, the line segment encoding unit 206, and the facsimile transmitting unit 208.
  • the original image receiving unit 202 is configured to receive an original image that needs to transmit a fax.
  • the original image decoding unit 204 is configured to decode the original image into a same color line segment.
  • the file format is compressed in the T.4 standard of the TIFF format file
  • decoding is performed in accordance with the standard compressed file format to decode the original image into black and white lines of the same color.
  • the image in the form of paper is read out in the form of a line segment of the same color.
  • the present embodiment is described by taking a black and white paper form as an example, and the input of the color file is similar, except that the color file needs to record the type of color.
  • the line segment encoding unit 206 is configured to encode the same color line segment into a same color line segment encoded image. Take the 1D and 2D encoding formats in the T.4 and T.6 codes recommended by the ITU-T ITU-T for example.
  • the facsimile computer uses 1D encoding to describe an image with a combination of a series of small line segments, each of which has the same color. Each image consists of multiple rows of data, each row consisting of a series of alternating black and white segments.
  • the 1D encoding replaces the length of each black line segment or white line segment with a specific bit code stream, and the line end symbol is also replaced with a specific bit code stream.
  • 2D encoding is an extension of 1D encoding.
  • the first line is coded in a 1D manner, and the following n lines give the position offset of the endpoint of a certain line segment of the line relative to the corresponding end point of the previous line on the basis of the previous line. After decoding the 2D code, it is still a line segment.
  • the same color line segment is not further divided into pixel points, and the same color line segment is directly used to identify the original image, and the same color line segment is directly encoded.
  • the source image in 1D or 2D format needs to be decoded, and the decoded result is a series of black and white segments.
  • the line segments are not converted into point sets according to the conventional method, and the images are scaled and converted on the basis of the point set; instead, the currently decoded black and white lines are directly converted.
  • the black and white line segment set of the destination image is not further divided into pixel points, and the same color line segment is directly used to identify the original image, and the same color line segment is directly encoded.
  • the image scaling and conversion algorithms all find a pixel set of the source image used to calculate a pixel color of the target image according to the zoom feature.
  • a similar method can be used to find the set of destination pixels associated with the color of a source pixel.
  • the Bilinear image processing algorithm can find the correspondence between the source pixel and the destination pixel using the method as shown in the figure. If the original image is reduced by half, the pixels 1 and 2 of the original image correspond to the pixel 1 of the destination image, and if the image is doubled, the pixels 1 and 2 of the source image correspond to the pixels 1 to 4 of the destination image. It can be seen that the correspondence between the source pixel and the destination pixel changes with the change of the scaling factor.
  • the result of the decoding is a series of small black and white segments.
  • the length of each small line segment of the destination image corresponding to the line segment of the original image is calculated, thereby obtaining a line segment set of the destination image, thereby obtaining a homochromatic line segment encoded image.
  • the image conversion can read the length value of the current line segment encoding, set the length value as the number of cycles for performing line segment encoding, and sequentially encode the line segment according to the number of cycles.
  • the fax transmitting unit 208 is configured to transmit the same-color line segment encoded image in a facsimile form.
  • the receiving facsimile computer 300 includes a facsimile receiving unit 302, a line segment decoding unit 304, a storage unit 306, a display unit 308, and an image printing unit 310.
  • the fax receiving unit 302 is configured to receive the fax of the above-mentioned same-line segment encoded image.
  • the line segment decoding unit 304 is configured to decode the same-color line segment encoded image to obtain a fax image.
  • decoding is performed according to the inverse process encoded by the line segment encoding unit 206. If the original image is reduced by half, the pixels 1 and 2 of the original image correspond to 1 of the destination image, and if the image is doubled, the pixels 1 and 2 of the source image correspond to 1 to 4 of the destination pixel. It can be seen that the correspondence between the source pixel and the destination pixel changes as the scaling factor changes.
  • the result of the decoding is a series of small black and white segments. The length of each small line segment of the destination image corresponding to the line segment of the original image is calculated, thereby obtaining a line segment set of the target image, thereby obtaining a same color line segment facsimile image.
  • the storage unit 306 is configured to store the decoded fax image.
  • the display unit 308 is configured to display the decoded fax image.
  • the image printing unit 310 is configured to print the decoded fax image.
  • the original image encoding unit 204 directly encodes the same-color line segment by using the original image encoding unit 204, thereby avoiding the use of the pixel point for encoding the memory space of the fax computer occupying a large space, and occupying more CPUs, thereby improving
  • the efficiency of the fax enables the fax system to be transmitted stably during one-to-many faxing, and the stability of the fax system is improved, which reduces the occurrence of fax computer downtime.
  • the memory used for transmitting the fax in the dot pixel is about 11 MB.
  • the technical solution of the embodiment of the present invention is about 0.4 MB.
  • the received fax image is displayed by the display unit 308 so that the user can browse the image without having to print out the fax.
  • the received fax image is stored by the storage unit 306, so that the user can temporarily not print the fax image without printing the paper, and can store the above-mentioned fax image for a long time, which is convenient for the user.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Facsimiles In General (AREA)
  • Compression Of Band Width Or Redundancy In Fax (AREA)
  • Color Image Communication Systems (AREA)

Description

传真方法、 系统和传真计算机 本申请要求于 2007 年 04 月 11 日提交中国专利局、 申请号为 200710073875.4、 发明名称为"传真方法、 系统和传真计算机"的中国专利申 请的优先权， 其全部内容通过引用结合在本申请中。 技术领域
本发明涉及计算机传真技术， 尤其涉及一种使用计算机传真技术的传 真方法、 系统和传真计算机。 背景技术
随着计算机技术的发展， 现代传真机的一个重要发展方向就是计算机 传真技术。 计算机传真通常计算机是把传真文件转换成为传真信号， 然后 通过有线网络或无线网络发送给接收端传真机。 接收端传真机把接收到的 信号还原成图像， 打印到纸上。
目 前， 业界的做法是釆用 国际电信联盟 （ ITU , International Telecommunication Union )推荐的 T.4和 T.6编码中的 1D和 2D编码格式。 该传真方法中编码方法为： 将图像分成黑白交替的小线段的组合后， 再把 每种黑白的小线段分割成为像素点得到像素点集， 然后对上述像素点集进 行编码。
发明人在实现本发明的过程中发现上述现有技术中至少存在以下缺 点： 如果传真的图像包含的像素点很多， 例如 1728x2200像素的图像， 包 含 3.6M个像素点左右， 并且需要传真的图像数量较多时， 存放这些像素点 所使用的内存空间较大。 再对这些像素点进行编码的时候， 占用传真机的 中央处理器（CPU, Central Processing Unit )量较大。 特别是在一对多的传 真系统中， 发送传真机的稳定性会由于内存和 CPU资源占用较大， 系统稳 定性较差， 经常宕机。 发明内容
本发明实施例提供一种使用计算机传真技术的传真方法、 系统和传真 计算机， 可节省传真计算机 CPU及内存资源， 并且性能稳定。
本发明实施例提供一种发送传真方法， 包括以下步骤： 获取需要发送传真的原始图像；
将所述原始图像转换成同色线段；
将所述同色线段编码成同色线段编码图像， 并以传真形式发送所述同 色线段编码图像给接收端。
本发明实施例提供一种接收传真方法， 包括如下步骤：
接收由同色线段编码得到的同色线段编码图像；
解码所述同色线段编码图像得到传真图像。
本发明实施例提供的一种传真系统， 包括： 发送传真计算机和接收传 真计算机， 其中：
所述发送传真计算机用于将原始图像转换为同色线段， 并将所述同色 线段编码成同色线段图像后， 发送给所述接收传真计算机；
所述接收传真计算机用于接收来自所述发送传真计算机的同色线段编 码图像， 并解码所述同色线段编码图像得到传真图像。
本发明实施例还提供一种传真计算机， 包括：
原始图像接收单元， 用于接收需要发送传真的原始图像；
原始图像解码单元， 用于将所述原始图像转换成同色线段集； 及 线段编码单元， 用于将所述同色线段集进行线段编码得到同色线段编 码图像；
传真发送单元， 用于将所述同色线段编码图像以传真形式发送。
本发明实施例提供的另一种传真计算机， 包括：
传真接收单元， 用于接收由同色线段编码得到的同色线段编码图像； 线段解码单元， 用于解码所述同色线段编码图像得到传真图像。
从上述方案可以看出， 本发明实施例通过对所述同色线段直接进行编 码， 避免使用像素点进行编码占用较大的传真计算机的内存空间， 及占用 较多的 CPU, 提高了传真的效率， 使得传真系统在一对多传真时也可以稳 定的传输， 传真系统的稳定性得到提高， 减少了传真计算机宕机情况的发 生。 以 3G主频 CPU和 1G内存的传真计算机发送测试为例，本发明实施例 在处理原始图像为 1728x2200 时， 以点像素发送传真时占用内存大概在 11MB左右， 以本发明实施例技术方案发送传真占用内存大概在 0.4MB左 右。对于原始图像为 1728x2200的计算时间，点像素发送传真需要 19000ms 左右， 而以本发明实施例仅需要 28ms。 附图说明
图 1为一个本发明实施例的传真方法流程图；
图 2为一个本发明实施例的线段编码实现示意图；
图 3为一个本发明实施例的线段解码实现示意图；
图 4为一个本发明实施例的传真系统框图。 具体实施方式
请参看图 1 , 一种传真方法， 包括以下步骤： 接收需要发送传真的原始 图像； 将所述原始图像解码成同色线段； 及将所述同色线段直接编码后以 传真形式发送同色线段编码图像。 该传真方法具体包括如下步骤：
步骤 102,发送传真计算机接收需要发送传真的原始图像。本实施例中， 所述原始图像为静态图像， 如标记图像文件格式（TIFF, Tagged Image File Format )文件或纸件等形式输入。 若为 TIFF格式文件可以以 T.4 T.6编码中 的 1D或 2D编码格式进行编码。
步骤 104, 发送传真计算机将原始图像解码成同色线段。 本实施例中， 如果以 TIFF格式文件的 T.4标准压缩文件格式， 按照标准压缩文件格式进 行解码将所述原始图像转换成黑色和白色的同色线段即可。 如果以纸件形 式输入， 将纸件形式的图像， 读出以同色线段的形式描述。 为方便描述， 本实施方式， 以输入黑白色的纸件形式为例进行说明， 彩色文件的输入与 之类似， 不同之处在于， 彩色文件需要记录颜色的种类。
步骤 106, 发送传真计算机将所述同色线段编码成同色线段编码图像， 并以传真形式发送。 以国际电信联盟 ITU-T推荐的 T.4和 T.6编码中的 1D 和 2D编码格式为例。 所述传真计算机使用 1D编码用一系列的小线段的组 合描述一个图像， 每个小线段的颜色为同一颜色。 每个图像由多行的数据 组成， 每行数据由一系列的黑白交替的线段组成。 1D编码把每种黑线段或 白线段的长度都用一个特定的位码流来代替， 把行结束符号也使用一个特 定的位码流来代替， 比如， 00110101表示白线段长度为 0, 0000110111表 示黑线段的长度为 0, 页结束符为： 000000000001 等等。 该图像最终会被 表示为这些特定的位码流的集合。 2D编码是 1D编码的扩展。 其第一行是 按照 1D的方式编码的，后面的 n行都在前一行的基础上给出本行某个的线 段的端点相对前一行相应的端点来说的位置偏移。把 2D方式的编码解码后 还是一条一条的线段。
本实施例中， 不再继续将同色线段分割成为像素点， 而直接利用同色 线段来标识原始图像， 直接对同色线段进行编码。 首先需要对 1D或 2D格 式的源图像进行解码， 解码结果得到一系列黑白相间的线段。 但是解码为 黑白相间的线段后， 不是按照传统的方法把这些线段转换为点集在点集的 基础上进行图像的放缩、 转换； 而是直接对目前解码得到的黑白相间的线 段进行转换得到目的图像的黑白相间的线段集。
请结合参看图 2, 本实施例中， 将图像放缩、 转换算法都根据放缩特征 找到计算目的图像某像素颜色所使用的源图像的像素集。 同样可以使用类 似的方法可以找到与某源象素颜色相关的目的像素集。 例如， 对于双线性 Bilinear图像处理算法， 可以使用如图所示的方法找到源像素与目的像素的 对应关系。 如果原始图像缩小一半， 则原始图像的像素 1和 2与目的图像 的像素 1相对应， 而如果图像放大一倍， 源图像的像素 1和 2与目的图像 的像素 1到 4相对应。 由此可见， 这种源像素与目的像素的对应关系会随 着放缩因数的变化而变化。 对于单色的传真图像来说， 解码结果是一系列 黑白相间的小线段。 计算出与原始图像的线段对应的目的图像的每一条小 线段的长度， 从而得到目的图像的线段集， 进而得到同色线段编码图像。 该图像转换可以读取当前线段编码的长度值， 设定此长度值为进行线段编 码的循环次数， 根据此循环次数， 依次对所述线段进行编码。
步骤 108, 接收传真计算机接收上述同色线段编码图像的传真。
步骤 110, 接收传真计算机解码所述同色线段编码图像得到传真图像。 请结合参看图 3 , 本实施例中， 按照步骤 106中编码的逆过程进行解码。 如 果原始图像缩小一半， 则原始图像的像素 1和 2与目的图像的像素 1相对 应， 而如果图像放大一倍， 源图像的像素 1和 2与目的图像的像素 1到 4 相对应。 由此可见这种源像素与目的像素的对应关系会随着放缩因数的变 化而变化。 对于单色的传真图像来说， 解码结果是一系列黑白相间的小线 段。 计算出与原始图像的线段对应的目的图像的每一条小线段的长度， 从 而得到目的图像的线段集， 进而得到同色线段传真图像。
步骤 112, 接收传真计算机存储解码后的传真图像。 本实施例中， 以带 有存储功能的传真计算机为例， 故包括此存储原始图像文件的步骤。 对于 本领域技术人员来说， 所述传真计算机可以不包括存储功能， 而直接处理 后发送传真。
步骤 114, 接收传真计算机显示解码后的传真图像。 本实施例中， 以带 有显示功能的传真计算机为例， 故包括此显示原始图像的步骤。 对于本领 域技术人员来说， 所述传真计算机也可以不包括显示功能。
步骤 116, 接收传真计算机打印解码后的传真图像。 本实施例中， 以带 有打印功能的传真计算机为例， 故包括此打印接收到的传真图像的步骤。 对于本领域技术人员来说， 所述传真计算机也可以不包括打印功能。
从上述方案可以看出， 本发明实施例通过对所述同色线段直接进行编 码， 避免使用像素点进行编码占用较大的传真计算机的内存空间， 及占用 较多的 CPU, 提高了传真的效率， 使得传真系统在一对多传真的时候也可 以稳定的传输， 传真系统的稳定性得到提高， 减少了传真计算机宕机情况 的发生。 以 3G主频 CPU和 1G内存的传真计算机发送测试为例，本发明实 施例在处理原始图像为 1728x2200 时， 以点像素发送传真时占用内存大概 在 11MB左右， 以本发明实施例技术方案发送传真占用内存大概在 0.4MB 左右。 对于原始图像为 1728x2200 的计算时间， 点像素发送传真需要 19000ms左右， 而以本发明实施例仅需要 28ms。 通过显示所述接收到的传 真图像， 使得用户可以不需要打印出传真即可浏览所述图像。 通过存储所 述接收到的传真图像， 使得用户在没有打印纸的情况， 可以暂时不打印所 述传真图像， 并且可以长期存储上述传真图像， 方便了用户。
请结合参看图 4, 提供一种传真系统， 包括发送传真计算机 200和接收 传真计算机 300。 所述发送传真计算机 200用于发送传真， 所述接收传真计 算机 300用于接收传真。 所述发送传真计算机 200将原始图像同色线段编 码后发送给所述接收传真计算机 300。
其中所述发送传真计算机 200进一步包括： 原始图像接收单元 202、原 始图像解码单元 204、 线段编码单元 206和传真发送单元 208。 原始图像接收单元 202用于接收需要发送传真的原始图像。
原始图像解码单元 204用于将所述原始图像解码成同色线段。 本实施 例中， 如果以 TIFF格式文件的 T.4标准压缩文件格式， 按照标准压缩文件 格式进行解码将所述原始图像解码成黑色和白色的同色线段即可。 如果以 纸件形式输入， 将纸件形式的图像， 读出以同色线段的形式描述。 为方便 描述， 本实施方式， 以输入黑白色的纸件形式为例进行说明， 彩色文件的 输入与之类似， 不同之处在于， 彩色文件需要记录颜色的种类。
线段编码单元 206 用于将所述同色线段编码成同色线段编码图像。 以 国际电信联盟 ITU-T推荐的 T.4和 T.6编码中的 1D和 2D编码格式为例。 所述传真计算机使用 1D编码用一系列的小线段的组合描述一个图像，每个 小线段的颜色为同一颜色。 每个图像由多行的数据组成， 每行数据由一系 列的黑白交替的线段组成。 1D编码把每种黑线段或白线段的长度都用一个 特定的位码流来代替， 把行结束符号也使用一个特定的位码流来代替。 比 如， 00110101表示白线段长度为 0, 0000110111表示黑线段的长度为 0, 页 结束符为： 000000000001 等等。 这样一幅图像最终会被表示为这些特定的 位码流的集合。 2D编码是 1D编码的扩展。其第一行是按照 1D的方式编码 的， 后面的 n行都在前一行的基础上给出本行某个的线段的端点相对前一 行相应的端点来说的位置偏移。把 2D方式的编码解码后还是一条一条的线 段。
本实施例中， 不再继续将同色线段分割成为像素点， 而直接利用同色 线段来标识原始图像， 直接对同色线段进行编码。 首先需要对 1D或 2D格 式的源图像进行解码， 解码结果得到一系列黑白相间的线段。 但是解码为 黑白相间的线段后， 不是按照传统的方法把这些线段转换为点集在点集的 基础上进行图像的放缩、 转换； 而是直接对目前解码得到的黑白相间的线 段进行转换得到目的图像的黑白相间的线段集。
请结合参看图 2, 本实施例中， 将图像放缩、 转换算法都根据放缩特征 找到计算目的图像某像素颜色所使用的源图像的像素集。 同样可以使用类 似的方法可以找到与某源象素颜色相关的目的像素集。 例如， 对于双线性 Bilinear图像处理算法， 可以使用如图所示的方法找到源像素与目的像素的 对应关系。 如果原始图像缩小一半， 则原始图像的像素 1与 2与目的图像 的像素 1相对应， 而如果图像放大一倍， 源图像的像素 1与 2与目的图像 的像素 1到 4相对应。 由此可见这种源像素与目的像素的对应关系会随着 放缩因数的变化而变化。 对于单色的传真图像来说， 解码结果是一系列黑 白相间的小线段。 计算出与原始图像的线段对应的目的图像的每一条小线 段的长度， 从而得到目的图像的线段集， 进而得到同色线段编码图像。 该 图像转换可以读取当前线段编码的长度值， 设定此长度值为进行线段编码 的循环次数， 根据此循环次数， 依次对所述线段进行编码。
传真发送单元 208用于将所述同色线段编码图像以传真形式发送。 所述接收传真计算机 300包括：传真接收单元 302、线段解码单元 304、 存储单元 306、 显示单元 308和图像打印单元 310。
传真接收单元 302, 用于接收上述同色线段编码图像的传真。
线段解码单元 304, 用于解码所述同色线段编码图像得到传真图像。 请 结合参看图 3 ,本实施例中 ,按照线段编码单元 206编码的逆过程进行解码。 如果原始图像缩小一半， 则原始图像的像素 1与 2与目的图像的 1相对应， 而如果图像放大一倍， 源图像的像素 1与 2与目的像素的 1到 4相对应。 由此可见这种源像素与目的像素的对应关系会随着放缩因数的变化而变 化。 对于单色的传真图像来说， 解码结果是一系列黑白相间的小线段。 计 算出与原始图像的线段对应的目的图像的每一条小线段的长度， 从而得到 目的图像的线段集， 进而得到同色线段传真图像。
存储单元 306 , 用于存储解码后的传真图像。
显示单元 308 , 用于显示解码后的传真图像。
图像打印单元 310, 用于打印解码后的传真图像。
从上述方案可以看出， 本发明实施例通过原始图像编码单元 204对所 述同色线段直接进行编码， 避免使用像素点进行编码占用较大的传真计算 机的内存空间， 及占用较多的 CPU, 提高了传真的效率， 使得传真系统在 一对多传真的时候也可以稳定的传输， 传真系统的稳定性得到提高， 减少 了传真计算机宕机情况的发生。以 3G主频 CPU和 1G内存的传真计算机发 送测试为例， 本发明实施例在处理原始图像为 1728x2200 时， 以点像素发 送传真时占用内存大概在 11MB 左右， 以本发明实施例技术方案发送传真 占用内存大概在 0.4MB左右。 对于原始图像为 1728x2200的计算时间， 点 像素发送传真需要 19000ms左右， 而以本发明实施例仅需要 28ms。 通过显 示单元 308显示所述接收到的传真图像， 使得用户可以不需要打印出传真 即可浏览所述图像。 通过存储单元 306存储所述接收到的传真图像， 使得 用户在没有打印纸的情况， 可以暂时不打印所述传真图像， 并且可以长期 存储上述传真图像， 方便了用户。
综上所述， 以上仅为本发明的较佳实施例而已， 并非用于限定本发明 的保护范围。 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
1. 一种发送传真方法， 其特征在于， 该方法包括以下步骤：
获取需要发送传真的原始图像；
将所述原始图像转换成同色线段；
将所述同色线段编码成同色线段编码图像， 并以传真形式发送所述同 色线段编码图像给接收端。
2. 如权利要求 1所述的传真方法， 其特征在于， 将所述同色线段集进 行编码的步骤， 包括：
计算所述同色线段的长度， 并且对所述同色线段的长度以一定的缩放比 例进行比例缩放。
3. 如权利要求 2所述的传真方法， 其特征在于， 所述比例缩放的缩放 算法包括：
点过滤算法、 矩形过滤算法、 三角形过滤算法、 椭圓形过滤算法或线性 转换算法中至少一种。
4. 如权利要求 2所述的传真方法， 其特征在于， 所述比例缩放为等比 例缩放。
5. 一种接收传真方法， 其特征在于， 包括如下步骤：
接收由同色线段编码得到的同色线段编码图像；
解码所述同色线段编码图像得到传真图像。
6. 如权利要求 5所述的传真方法， 其特征在于， 还包括输出所得到的 图像的步骤：
显示或打印所述传真图像。
7. 一种传真系统， 其特征在于， 该传真系统包括： 发送传真计算机和 接收传真计算机， 其中：
所述发送传真计算机用于将原始图像转换为同色线段， 并将所述同色 线段编码成同色线段图像后， 发送给所述接收传真计算机；
所述接收传真计算机用于接收来自所述发送传真计算机的同色线段编 码图像， 并解码所述同色线段编码图像得到传真图像。
8. 一种传真计算机， 其特征在于， 包括： 原始图像接收单元， 用于接收需要发送传真的原始图像； 原始图像解码单元， 用于将所述原始图像转换成同色线段集； 及 线段编码单元， 用于将所述同色线段集进行线段编码得到同色线段编 码图像； 及
传真发送单元， 用于将所述同色线段编码图像以传真形式发送。
9. 一种传真计算机， 其特征在于， 包括：
传真接收单元， 用于接收由同色线段编码得到的同色线段编码图像； 及
线段解码单元， 用于解码所述同色线段编码图像得到传真图像。
10. 如权利要求 9所述的传真计算机， 其特征在于， 还包括： 图像打印单元， 用于打印所述传真图像。
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CN101060577A (zh) * 2007-04-11 2007-10-24 华为技术有限公司 传真方法、系统和传真计算机

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