Image signal coding device
    1.
    发明授权
    Image signal coding device 失效
    图像信号编码装置

    公开(公告)号:US5570203A

    公开(公告)日:1996-10-29

    申请号:US325143

    申请日:1994-10-20

    摘要: An image signal coding device capable of attaining a high-speed coding operation without increasing a circuit scale. The image signal coding device includes a DCT section for performing two-dimensional orthogonal transform to each of plural pixel blocks obtained by dividing an image signal to generate a transform coefficient, a linear quantization section for linearly quantizing the transform coefficient by using given quantization characteristics to generate a quantized coefficient, and a variable length coding section for performing variable length coding to the quantized coefficient to generate code data. The image signal coding device further includes an effective region holding section for holding region information including a range of the transform coefficient to be linearly quantized by the linear quantization section and a range of the quantized coefficient to be coded by the variable length coding section.

    摘要翻译: 一种能够在不增加电路规模的情况下实现高速编码操作的图像信号编码装置。 图像信号编码装置包括:DCT部分,用于对通过划分图像信号获得的多个像素块中的每一个进行二维正交变换,以生成变换系数;线性量化部分,用于通过使用给定的量化特性对变换系数进行线性量化 生成量化系数,以及可变长度编码部分,用于对量化系数执行可变长度编码以生成代码数据。 图像信号编码装置还包括有效区域保持部分,用于保持包括由线性量化部分线性量化的变换系数的范围的区域信息和由可变长度编码部分编码的量化系数的范围。

    Image coding/decoding device
    2.
    发明授权
    Image coding/decoding device 失效
    图像编码/解码装置

    公开(公告)号:US5577132A

    公开(公告)日:1996-11-19

    申请号:US363324

    申请日:1994-12-23

    摘要: An image coding device for coding an input image of multi-level. In the image coding device, an input multi-level image is analyzed by an image analyzing portion, and update information to be used when a probability estimation value is generated is generated by an update value determining portion on the basis of adjoining pixel information as a result of the analysis by the image analyzing portion. Further, a probability estimation value is generated by a probability estimating portion on the basis of the update information generated by the update value determining portion and the result of the analysis by the image analyzing portion, and the input multi-level image is arithmetically coded by a code word generating portion on the basis of the probability estimation value generated by the probability estimating portion.

    摘要翻译: 一种用于编码多级输入图像的图像编码装置。 在图像编码装置中,通过图像分析部分对输入的多级图像进行分析,并且通过更新值确定部分基于相邻的像素信息生成作为概率估计值生成时使用的更新信息作为 由图像分析部分分析的结果。 此外,基于由更新值确定部分生成的更新信息和图像分析部分的分析结果,通过概率估计部分生成概率估计值,并且输入的多级图像被算术编码 基于由所述概率估计部生成的概率估计值的码字生成部。

    Color converting device
    3.
    发明授权
    Color converting device 失效
    颜色转换装置

    公开(公告)号:US06459437B1

    公开(公告)日:2002-10-01

    申请号:US09453716

    申请日:1999-12-03

    IPC分类号: G06T1140

    CPC分类号: G06T11/001

    摘要: An index signal and a delta signal are generated from an input pixel value, and then, inputted to an input buffer by every predetermined pixel to be processed. A controlling unit compares the index signal in the input buffer with a tag (index signal) in a coefficient cache. When they coinside with each other, the controlling unit reads out the corresponding coefficient from the coefficient cache and supplies the same to an interpolating unit. The interpolating unit simultaneously receives the delta signal and supplies the keeping color data to an output buffer. Thereafter, the interpolating unit accesses to the coefficient storing memory by using an index signal that does not coinside with either one of cache-tag (index signal) to obtain a coefficient, and similarly, interpolatively generates color data. Data of converted color is outputted from the output buffer in the order of inputting the pixel. A color converting device of the present invention can perform a color conversion with high precision without increasing a reading-out band of a coefficient table for a color conversion.

    摘要翻译: 从输入像素值生成索引信号和增量信号,然后通过每个要处理的预定像素输入到输入缓冲器。 控制单元将输入缓冲器中的索引信号与系数高速缓存中的标签(索引信号)进行比较。 当它们彼此硬币化时,控制单元从系数高速缓存读出相应的系数并将其提供给内插单元。 内插单元同时接收增量信号,并将保持颜色数据提供给输出缓冲器。 此后,内插单元通过使用不具有硬币的索引信号来访问系数存储存储器,其中任一个缓存标签(索引信号)中的任何一个以获得系数,并且类似地内插地生成颜色数据。 以输入像素的顺序从输出缓冲器输出转换后的颜色数据。 本发明的颜色转换装置可以在不增加用于颜色转换的系数表的读出频带的情况下以高精度执行颜色转换。

    Singular value decomposition coding and decoding apparatuses
    5.
    发明授权
    Singular value decomposition coding and decoding apparatuses 失效
    奇异值分解编码和解码装置

    公开(公告)号:US5615288A

    公开(公告)日:1997-03-25

    申请号:US232801

    申请日:1994-04-25

    IPC分类号: G06T9/00 G06K9/36

    CPC分类号: G06T9/001

    摘要: An input image is divided into blocks each represented by n.times.n matrix X, and then X.sup.T X is calculated. Singular values of X that are positive square roots of eigenvalues of X.sup.T X and first singular vectors that are normalized eigenvectors of X.sup.T X are calculated by, for instance, the Jacobi method. Second singular vectors that are normalized eigenvectors of XX.sup.T are calculated analytically using the singular values and the first singular vectors. The singular values and the first and second singular vectors thus calculated are coded.

    摘要翻译: 输入图像被分成由n×n矩阵X表示的块,然后计算XTX。 作为XTX的归一化特征向量的XTX的特征值的正平方根的X的奇异值,例如通过Jacobi方法计算。 使用奇异值和第一个奇异矢量分析计算XXT的归一化特征向量的第二个奇异向量。 如此计算的奇异值和第一和第二奇异矢量被编码。

    Markov model image encoding device and method
    7.
    发明授权
    Markov model image encoding device and method 失效
    马尔可夫模型图像编码装置及方法

    公开(公告)号:US5987182A

    公开(公告)日:1999-11-16

    申请号:US876484

    申请日:1997-06-16

    CPC分类号: G06T9/00

    摘要: A plurality of reference pixel extracting means check their corresponding reference pixel ranges and pixel values in predetermined auxiliary regions. Reference pixel range selecting means selects a reference pixel range based on the checked pixel values. When the number of types of pixel values for an input image is found to be locally low in the selected reference pixel range, the number of reference pixels is increased. On the other hand, when the number of types of the pixel values for the input image is found to be locally large, the number of reference pixels is decreased. As a result, states can be generated by a Markov model image encoding system capable of improving encoding efficiency without increasing the number of the states sharply. Owing to the above construction, even when the number of tones for the input image is high upon Markov model image encoding, the number of reference pixels can be increased without abruptly increasing the number of states later on to improve compression efficiency.

    摘要翻译: 多个参考像素提取装置在预定的辅助区域中检查其对应的参考像素范围和像素值。 参考像素范围选择装置基于所检查的像素值来选择参考像素范围。 当在所选择的参考像素范围中发现输入图像的像素值的数量在本地较低时,参考像素的数量增加。 另一方面,当发现输入图像的像素值的类型的数量局部地大时,参考像素的数量减少。 结果,可以通过能够提高编码效率的马尔可夫模型图像编码系统来生成状态,而不会急剧增加状态数。 由于上述结构,即使在马尔科夫模型图像编码时输入图像的色调数量高的情况下,也可以增加参考像素的数量而不会稍后突然增加状态数来提高压缩效率。

    Image information coding apparatus and method using code amount of a
selected pixel block for changing coding parameter
    8.
    发明授权
    Image information coding apparatus and method using code amount of a selected pixel block for changing coding parameter 失效
    图像信息编码装置和使用所选择的像素块的代码量来改变编码参数的方法

    公开(公告)号:US5956430A

    公开(公告)日:1999-09-21

    申请号:US726410

    申请日:1996-10-03

    IPC分类号: G06T9/00

    CPC分类号: G06T9/005

    摘要: An image information coding apparatus includes a block generator for dividing image information into pixel blocks, each of which consists of a predetermined number of pixels. A block selector selects a pixel block in a position different from that of a pixel block selected in a preceding block line in a main scanning direction from the pixel blocks generated by the block generator. A parameter setting device sets a coding parameter to a predetermined value. A first variable-length coding device conducts variable-length coding of the pixel block selected by the block selector using the coding parameter. A code amount controller changes a value of the coding parameter so that the code amount of the pixel block selected by the block selector and coded by the first variable-length coding device is not more than a predetermined code amount, and a second variable-length coding device conducts variable-length coding of all of the pixel blocks using a coding parameter changed by the code amount controller.

    摘要翻译: 图像信息编码装置包括块图像信号分割成像素块的块发生器,每个像素块由预定数量的像素构成。 块选择器从块生成器生成的像素块中选择与主扫描方向上的前一块行中选择的像素块的位置不同的像素块。 参数设定装置将编码参数设定为规定值。 第一可变长度编码装置使用编码参数对由块选择器选择的像素块进行可变长度编码。 代码量控制器改变编码参数的值,使得由块选择器选择并由第一可变长度编码装置编码的像素块的代码量不大于预定代码量,并且第二可变长度 编码装置使用由代码量控制器改变的编码参数来进行所有像素块的可变长度编码。