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    Image processing method and apparatus, computer program, and storage medium
    2.
    发明公开
    Image processing method and apparatus, computer program, and storage medium 有权
    Bildverarbeitungsverfahren und -vorrichtung，Computerprogramm und Speichermedium

    公开(公告)号：EP1292153A2

    公开(公告)日：2003-03-12

    申请号：EP02255970.2

    申请日：2002-08-28

    申请人： CANON KABUSHIKI KAISHA

    发明人： Nakayama, Tadayoshi, c/o Canon Kabushiki Kaisha ,  Ohta, Ken-ichi, c/o Canon Kabushiki Kaisha ,  Osawa, Hidefumi, c/o Canon Kabushiki Kaisha ,  Kato, Shinichi, c/o Canon Kabushiki Kaisha ,  Ito, Naoki, c/o Canon Kabushiki Kaisha

    IPC分类号： H04N7/30

    CPC分类号： H04N1/411 ,  H04N19/124 ,  H04N19/15 ,  H04N19/192 ,  H04N19/40 ,  H04N19/423 ,  H04N19/436 ,  H04N19/60

    摘要： This invention is designed to encode the image area information of a multilevel image within a target size without re-inputting the information. For this purpose, from the multilevel image data input from the input unit (101), an image area information generating unit (1701) generates, for each pixel, image area information constituted by an image area component indicating whether the pixel exists in a character line drawing area or halftone area and an image area component indicating whether the pixel is chromatic or achromatic. A lossless encoding unit (1705) encodes this information on a block basis, and stores the resultant information in a third memory (1709). An encoding control unit (1713) monitors an amount of code. Upon determining that the amount of code exceeds a target amount, the encoding control unit causes the lossless encoding unit (1705) to perform encoding upon changing image area components, of subsequently input image area components, which coincide with a condition. The codes that have already been stored in the third memory (1709) are temporarily decoded by a lossless code re-encoding unit (1715), and the above image area components are changed. The resultant data is then re-encoded and stored in the third memory (1709).

    摘要翻译： 本发明被设计为在目标尺寸内编码多级图像的图像区域信息而不重新输入信息。 为此，根据从输入单元（101）输入的多级图像数据，图像区域信息生成单元（1701）针对每个像素生成由指示像素是否存在于字符中的图像区域分量构成的图像区域信息 线画区域或半色调区域，以及指示像素是彩色还是无彩色的图像区域分量。 无损编码单元（1705）以块为基础对该信息进行编码，并将结果信息存储在第三存储器（1709）中。 编码控制单元（1713）监视代码量。 当确定代码量超过目标量时，编码控制单元使得无损编码单元（1705）在改变与条件一致的随后输入的图像区域分量的图像区域分量时执行编码。 已经存储在第三存储器（1709）中的代码由无损代码重新编码单元（1715）临时解码，并且上述图像区域分量被改变。 然后将所得数据重新编码并存储在第三存储器（1709）中。

    Image encoding apparatus and method
    4.
    发明公开
    Image encoding apparatus and method 失效
    Gerätund Verfahren zur Bildkodierung。

    公开(公告)号：EP0564227A1

    公开(公告)日：1993-10-06

    申请号：EP93302463.0

    申请日：1993-03-30

    申请人： CANON KABUSHIKI KAISHA

    发明人： Sato, Mamoru, c/o Canon Kabushiki Kaisha ,  Osawa, Hidefumi, c/o Canon Kabushiki Kaisha

    IPC分类号： H04N1/41

    CPC分类号： H04N1/41

    摘要： An image processing apparatus is provided which can shape codes and omit buffers at a decoding side as well as omit an image memory at an encoding side by providing code buffers for respective encoders. An image encoding apparatus for encoding image information in a hierarchical form includes encoders provided for respective hierarchies and code buffers provided after the respective encoders. Furthermore, it is possible to use a common code buffer memory for respective hierarchies at the encoding side. In such a case, by arranging so that a hierarchical tag can identify to which hierarchy a code belongs, a simplified encoding apparatus is provided.

    摘要翻译： 提供一种图像处理装置，其可以在解码侧形成代码并省略缓冲器，并且通过为各个编码器提供代码缓冲器来省略编码侧的图像存储器。 用于以层次形式对图像信息进行编码的图像编码装置包括为相应编码器提供的各层次编码器和代码缓冲器。 此外，可以在编码侧对各层次使用公共代码缓冲存储器。 在这种情况下，通过这样设置，使得分层标签可以识别代码所属的哪个层级，提供简化的编码装置。

    Image encoding method
    5.
    发明公开
    Image encoding method 失效
    图像编码方法

    公开(公告)号：EP0395394A3

    公开(公告)日：1991-02-13

    申请号：EP90304485.7

    申请日：1990-04-25

    申请人： CANON KABUSHIKI KAISHA

    发明人： Osawa, Hidefumi, c/o Canon Kabushiki Kaisha ,  Yasuda, Yasuhiko ,  Kato, Shigeo

    IPC分类号： H04N1/417

    CPC分类号： H04N1/642 ,  G06T9/004 ,  H04N1/417 ,  H04N1/648

    摘要： There is provided an image encoding method in a facsimile apparatus or an image filing apparatus as an image communication apparatus. In this method, a color image signal which is expressed by a plurality of color component signals to be encoded is input, the input color image signal is converted into a bit stream signal, and the bit stream signal is encoded by the prediction encoding. A parameter for the prediction encoding is changed in accordance with the color image signal to be encoded. The encoding operation is executed adaptively to the color image signal to be encoded. By bit stream converting the binary color signal, the efficient encoding using the color correlation can be executed and an increase in data amount is prevented. By encoding the bit stream signal by using a dynamic arithmetic code, a binary color image can be efficiently encoded.

    Image processing method, apparatus and computer program for compression-encoding
    6.
    发明公开
    Image processing method, apparatus and computer program for compression-encoding 有权
    Bildverarbeitungsverfahren und -vorrichtung und ComputerprogramfürKompressionskodierung

    公开(公告)号：EP1271926A2

    公开(公告)日：2003-01-02

    申请号：EP02254149.4

    申请日：2002-06-13

    申请人： CANON KABUSHIKI KAISHA

    发明人： Ohta, Ken-ichi, c/o Canon Kabushiki Kaisha ,  Nakayama, Tadayoshi, c/o Canon Kabushiki Kaisha ,  Osawa, Hidefumi, c/o Canon Kabushiki Kaisha ,  Kato, Shinichi, c/o Canon Kabushiki Kaisha ,  Ito, Naoki c/o Canon Kabushiki Kaisha

    IPC分类号： H04N1/41

    CPC分类号： H04N1/41 ,  H04N19/126 ,  H04N19/15 ,  H04N19/156 ,  H04N19/172 ,  H04N19/176 ,  H04N19/18 ,  H04N19/186 ,  H04N19/192 ,  H04N19/42 ,  H04N19/423 ,  H04N19/60

    摘要： This invention is designed to effectively generate encoded data within a set size by inputting image data once. For this purpose, the image input through an input unit (101) is compressed by an encoding unit (102) and stored in first and second memories (104, 106). A first counter (107) counts the data in its code amount. When the amount of encoded data generated reaches a predetermined size, an encoding sequence control unit (108) sets quantization steps in the encoding unit (102) and an re-encoding unit (109) to increase compression ratios. In addition, the encoding sequence control unit (108) clears the first memory (104), causes the re-encoding unit (109) to re-encode the encoded data stored in the second memory, and stores the resultant data in the first memory (104). Since the encoding unit (102) continues encoding data with the set quantization step, the encoded data are stored in the first memory (104) from the start of the image. Subsequently, every time the data amount stored in the first memory reaches a predetermined amount, the quantization step is increased, and the processing is repeated.

    摘要翻译： 本发明被设计成通过一次输入图像数据来有效地生成设定尺寸内的编码数据。 为此，通过输入单元（101）输入的图像由编码单元（102）压缩并存储在第一和第二存储器（104,106）中。 第一计数器（107）以其代码量对数据进行计数。 当生成的编码数据量达到预定大小时，编码序列控制单元（108）在编码单元（102）和重新编码单元（109）中设置量化步长以增加压缩率。 此外，编码序列控制单元（108）清除第一存储器（104），使再编码单元（109）对存储在第二存储器中的编码数据进行重新编码，并将结果数据存储在第一存储器 （104）。 由于编码单元（102）利用设定的量化步长继续对数据进行编码，所以编码的数据从图像的开始被存储在第一存储器（104）中。 随后，每当存储在第一存储器中的数据量达到预定量时，增加量化步长，并且重复处理。

    Image encoding method
    9.
    发明公开
    Image encoding method 失效
    Bildkodierverfahren。

    公开(公告)号：EP0395394A2

    公开(公告)日：1990-10-31

    申请号：EP90304485.7

    申请日：1990-04-25

    申请人： CANON KABUSHIKI KAISHA

    发明人： Osawa, Hidefumi, c/o Canon Kabushiki Kaisha ,  Yasuda, Yasuhiko ,  Kato, Shigeo

    IPC分类号： H04N1/417

    CPC分类号： H04N1/642 ,  G06T9/004 ,  H04N1/417 ,  H04N1/648

    摘要： There is provided an image encoding method in a facsimile apparatus or an image filing apparatus as an image communication apparatus. In this method, a color image signal which is expressed by a plurality of color component signals to be encoded is input, the input color image signal is converted into a bit stream signal, and the bit stream signal is encoded by the prediction encoding. A parameter for the prediction encoding is changed in accordance with the color image signal to be encoded. The encoding operation is executed adaptively to the color image signal to be encoded. By bit stream converting the binary color signal, the efficient encoding using the color correlation can be executed and an increase in data amount is prevented. By encoding the bit stream signal by using a dynamic arithmetic code, a binary color image can be efficiently encoded.

    摘要翻译： 提供了作为图像通信装置的传真装置或图像归档装置中的图像编码方法。 在该方法中，输入由要编码的多个颜色分量信号表示的彩色图像信号，将输入彩色图像信号转换为比特流信号，并通过预测编码对比特流信号进行编码。 预测编码的参数根据要编码的彩色图像信号而改变。 编码操作被自适应地执行要被编码的彩色图像信号。 通过比特流转换二进制彩色信号，可以执行使用色彩相关性的有效编码，并且防止数据量的增加。 通过使用动态算术码对比特流信号进行编码，可以有效地对二进制彩色图像进行编码。