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    • 63. 发明授权
    • Image coding apparatus
    • 图像编码装置
    • US06577681B1
    • 2003-06-10
    • US09384545
    • 1999-08-27
    • Shunichi Kimura
    • Shunichi Kimura
    • H04N712
    • H04N19/18H04N19/115H04N19/122H04N19/126H04N19/13H04N19/137H04N19/176H04N19/60
    • In coding through adaptive quantization after transforming an image into frequency areas, such as JPEG, quantization step width control information and other information are efficiently coded. An input image is processed in a blocking circuit and a quantizer. A quantization step width is determined by multiplying a matrix of a basic quantization table by an SF value of a scaling factor calculating circuit. Quantized AC components are coded in an AC component coding circuit 51. Quantized DC components are converted into DC differences and further into group numbers and additional bits. SF values are also converted into SF value differences and further into group numbers and additional bits. The DC components and the group numbers of the SF values are converted into two-dimensional Huffman codes. The above described code elements are multiplexed and outputted.
    • 在将图像变换为诸如JPEG的频率区域之后的自适应量化的编码中,量化步长控制信息和其他信息被有效地编码。 在阻塞电路和量化器中处理输入图像。 通过将基本量化表的矩阵乘以比例因子计算电路的SF值来确定量化步长。 量化的AC分量被编码在AC分量编码电路51中。量化的DC分量被转换成DC差,并进一步转换成组号和附加的比特。 SF值也被转换为SF值差异,并进一步转换成组号和附加位。 DC分量和SF值的组编号被转换为二维霍夫曼码。 上述代码元素被复用并输出。
    • 64. 发明授权
    • Image processing apparatus
    • 图像处理装置
    • US5995660A
    • 1999-11-30
    • US890424
    • 1997-07-09
    • Akihiro AndohShunichi KimuraShinji ShishidoYutaka Koshi
    • Akihiro AndohShunichi KimuraShinji ShishidoYutaka Koshi
    • H04N1/40G06K9/20G06T7/40H03M7/30H04N1/413G06K9/00G06K9/62G06K9/68
    • G06K9/00456
    • The present invention has an object to determine whether image data is generated by data processing such as PDL, or optically captured scan-in image, for each area.To achieve the object, a determining table is provided for distribution patterns of pixels having substantially the same pixel value for image data area composed of plural pixels. Then a reference area designating unit designates a reference area by selecting from input image data the pixel of interest having a pixel value and the reference pixels surrounding thereof. A same pixel value distribution generating unit compares the pixel value of the pixel of interest with the pixel values of the reference pixels in the reference area to generate a distribution pattern of the pixel having substantially the same pixel value. Next, a determining unit compares the generated distribution pattern with the distribution patterns held in the determining table to determine the reference area to be the image data generated by data processing.
    • 本发明的目的是确定通过诸如PDL的数据处理或者每个区域的光学捕获的扫描图像来生成图像数据。 为了实现该目的,提供了一个确定表,用于具有与由多个像素组成的图像数据区域具有基本相同的像素值的像素的分布图案。 然后,参考区域指定单元通过从输入图像数据中选择具有像素值的关注像素和围绕它的参考像素来指定参考区域。 相同像素值分布生成单元将感兴趣像素的像素值与参考区域中的参考像素的像素值进行比较,以生成具有基本相同像素值的像素的分布图案。 接下来,确定单元将生成的分布模式与保持在确定表中的分布模式进行比较,以确定作为通过数据处理生成的图像数据的参考区域。
    • 66. 发明授权
    • Image data coding system for controlling amounts of code data for
character image and natural image regions
    • 用于控制字符图像和自然图像区域的代码数据量的图像数据编码系统
    • US5701367A
    • 1997-12-23
    • US325144
    • 1994-10-20
    • Yutaka KoshiShunichi KimuraKoh Kamizawa
    • Yutaka KoshiShunichi KimuraKoh Kamizawa
    • H04N1/41G06T9/00H03M7/40H04N1/413G06K9/36G06K9/46
    • G06T9/00
    • An image coding device capable of securely controlling a total code amount to a fixed amount in coding image data including a character image region and a natural image region mixed together. The image coding device includes a first circuit for extracting a character image region having a variable size from input image data; a second circuit for controlling a code amount of image data of the character image region; a third circuit for multivaluing image data of the character image region extracted by the first circuit; a fourth circuit for reversible coding image data of the character image region multivalued by the third circuit; a fifth circuit for subtracting the image data of the character image region from the input image data to generate image data of a natural image region; and a sixth circuit for non-reversible coding the image data of the natural image region generated from the fifth circuit; wherein the size of the character image region to be extracted by the first circuit is controlled by the second circuit so that the code amount of the image data of the character image region becomes a first preset target code amount, and the image data of the natural image region is coded by the sixth circuit so that a code amount of the image data of the natural image region becomes a second preset target code amount.
    • 一种图像编码装置,其能够将包含混合在一起的文字图像区域和自然图像区域的图像数据编码,将总代码量稳定地控制在一定数量。 图像编码装置包括:第一电路,用于从输入图像数据中提取具有可变尺寸的字符图像区域; 用于控制字符图像区域的图像数据的代码量的第二电路; 用于多值化由第一电路提取的字符图像区域的图像数据的第三电路; 用于对由第三电路多值的字符图像区域的图像数据进行可逆编码的第四电路; 第五电路,用于从输入图像数据中减去字符图像区域的图像数据,以产生自然图像区域的图像数据; 以及用于对从第五电路产生的自然图像区域的图像数据进行不可逆编码的第六电路; 其中由第一电路提取的字符图像区域的尺寸由第二电路控制,使得字符图像区域的图像数据的代码量变为第一预设目标代码量,并且自然图像数据 图像区域由第六电路编码,使得自然图像区域的图像数据的代码量变为第二预设目标代码量。
    • 69. 发明授权
    • Method of determining quantization step in a subband coding system
    • 确定子带编码系统中的量化步长的方法
    • US5487119A
    • 1996-01-23
    • US306490
    • 1994-09-15
    • Shunichi KimuraYutaka KoshiKoh Kamizawa
    • Shunichi KimuraYutaka KoshiKoh Kamizawa
    • H04N1/40G06T9/00H04N1/41H04N19/00H04N19/126H04N19/136H04N19/176H04N19/189H04N19/196H04N19/46H04N19/635H04N19/70G06K9/36
    • H04N19/98H04N19/61H04N19/63H04N19/645H04N19/115H04N19/146
    • An image coding method by which accurate code amount control can be performed without the necessity of recursive processing. The image coding apparatus is applied to an image coding apparatus which includes a subband division section for dividing an input image signal into a plurality of subband signals having frequency bands different from each other and having predetermined bit numbers distributed individually thereto, a subblock division section for dividing the subband signals obtained from the subband division section into a plurality of subblocks each having a spatial spread, a classification section for classifying the subband signals for each of the subblocks obtained from the subblock division section, a quantization section for quantizing the subband signals for each of the subblocks obtained from the subblock division section by linear quantization with a step width determined in response to a class outputted from the classification section and outputting a quantization index, and a code allocation section for allocating the quantization index from the quantization section as a codeword.
    • 可以在不需要递归处理的情况下执行精确的代码量控制的图像编码方法。 图像编码装置被应用于图像编码装置,图像编码装置包括:子带分割部,用于将输入图像信号分割成具有彼此不同的频带的多个子带信号,并且具有分别分配的预定比特数;子块分割部, 将从子带分割部分获得的子带信号分割为具有空间扩展的多个子块,分类部分,用于对从子块分割部分获得的每个子块分类子带信号;量化部分,用于量化子带信号, 从子块划分部分获得的每个子块通过线性量化获得,其中步长根据从分类部分输出的类别确定并输出量化索引;以及代码分配部分,用于将量化部分的量化索引分配为 码字。