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    • 1. 发明授权
    • Image coding apparatus and image coding method
    • 图像编码装置和图像编码方法
    • US08699563B2
    • 2014-04-15
    • US12757358
    • 2010-04-09
    • Kashu TakahashiTakaaki FuchieShojiro Shibata
    • Kashu TakahashiTakaaki FuchieShojiro Shibata
    • G06K9/00H04B1/66
    • H04N19/194H04N19/126H04N19/15H04N19/176H04N19/61
    • An image coding apparatus includes a first coding unit that discretely selects quantization parameters of a first range to perform calculation of generated code amounts corresponding to the selected quantization parameters, a second coding unit that performs calculation of generated code amounts corresponding to quantization parameters of a second range, a code amount control unit that decides deciding a temporary quantization parameter corresponding to a target code amount by calculating generated code amounts through an interpolation process for quantization parameters not selected by the first coding unit, and by comparing the generated code amounts corresponding to the selected quantization parameters and the generated code amounts calculated through the interpolation process with the target code amount, and decides an optimal quantization parameter corresponding to the target code amount by comparing the generated code amounts calculated by the second coding unit with the target code amount.
    • 一种图像编码装置包括:第一编码单元,离散地选择第一范围的量化参数,以执行与所选择的量化参数对应的生成代码量的计算;第二编码单元,执行与第二范围的量化参数对应的生成代码量的计算 范围,代码量控制单元,其通过对通过第一编码单元未选择的量化参数的内插处理计算生成代码量来决定与目标代码量相对应的临时量化参数,并且通过将与 选择的量化参数和通过具有目标代码量的内插处理计算的生成代码量,并且通过将由第二编码单元计算出的生成代码量与目标c进行比较来决定与目标代码量相对应的最佳量化参数 数量。
    • 4. 发明授权
    • Image processing apparatus and image processing method
    • 图像处理装置和图像处理方法
    • US08270744B2
    • 2012-09-18
    • US12673186
    • 2009-06-23
    • Takaaki FuchieKyohei KoyabuShojiro ShibataKashu TakahashiYuya Horiuchi
    • Takaaki FuchieKyohei KoyabuShojiro ShibataKashu TakahashiYuya Horiuchi
    • G06K9/36G06K9/46G06K9/38H04B1/66
    • H04N19/436H04N19/103H04N19/126H04N19/13H04N19/14H04N19/149H04N19/15H04N19/176H04N19/18H04N19/192H04N19/197H04N19/50H04N19/61H04N19/89H04N19/91
    • The present invention enables a reduction in circuit scale.In an image coding apparatus (100), as for DCT coefficients as simple coded data obtained by coding an input image (91) by simple processing, the input image (91) is coded by at least quantizing the input image (91) as an input image on the basis of selected quantization parameters (QPl) discretely selected from quantization parameters (QP) as quantization factors, thereby computing generated code sizes of the input image (91) upon coding. The image coding apparatus (100) corrects an error in the generated code sizes of the input image upon coding which occurs in accordance with the simple processing, thereby computing low-precision generated code sizes. The image coding apparatus (100) computes low-precision generated code sizes when the input image (91) is coded on the basis of quantization parameters (QP) other than the selected quantization parameters (QPl), by an interpolation process with respect to the low-precision generated code sizes when the input image (91) is coded on the basis of the selected quantization parameters (QPl).
    • 本发明能够减小电路规模。 在图像编码装置(100)中,对于作为通过简单处理对输入图像(91)进行编码而获得的简单编码数据的DCT系数,输入图像(91)通过至少将输入图像(91)量化为 基于从量化参数(QP)离散地选择的量化参数(QP1)作为量化因子的输入图像,从而计算编码时输入图像(91)的生成代码大小。 图像编码装置(100)根据简单处理对编码后的输出图像的生成码量进行校正,从而计算出低精度生成码量。 当根据所选择的量化参数(QP1)以外的量化参数(QP)对输入图像(91)进行编码时,图像编码装置(100)通过相对于所选择的量化参数 基于选择的量化参数(QP1)对输入图像(91)进行编码时的低精度生成码量。
    • 5. 发明申请
    • IMAGE PROCESSING DEVICE AND IMAGE PROCESSING METHOD
    • 图像处理装置和图像处理方法
    • US20110182524A1
    • 2011-07-28
    • US12673216
    • 2009-06-23
    • Shojiro ShibataYakaaki FuchieKashu TakahashiYuya Horiuchi
    • Shojiro ShibataYakaaki FuchieKashu TakahashiYuya Horiuchi
    • G06K9/00
    • H04N19/146H04N19/13H04N19/176H04N19/196
    • The present invention enables a circuit configuration to be simplified. An image encoding device (100) receives an input image (91) that is line-scanned in units of MBs as scan blocks, each constituted by a plurality of 4×4 blocks, while being scanned in units of 4×4 blocks as encoding blocks, each constituted by a plurality of pixels. The image encoding device (100) selects a VLC (variable length) table corresponding to a table selection index nC, which is an average value of the numbers nB and nA of nonzero coefficients as encoding values on which variable-length encoding is performed in upper-adjoining and left-adjoining 4×4 blocks of a 4×4 block as an encoding target in quantization coefficients as encoding target data based on the input image (91). At this time, in a case where the 4×4 block as an encoding target is at an upper end of an MB, the image encoding device (100) equates the number nB of nonzero coefficients of the upper-adjoining 4×4 block with the number nA of nonzero coefficients of the left-adjoining 4×4 block. The image encoding device (100) performs variable-length encoding on the number of nonzero coefficients of a 4×4 block as an encoding target in quantization coefficients using the selected VLC table.
    • 本发明能够简化电路配置。 图像编码装置(100)接收以MB为单位进行线扫描的输入图像(91),作为扫描块,每个扫描块由多个4×4块构成,同时以4×4块为单位进行扫描,作为编码 每个块由多个像素构成。 图像编码装置(100)选择与表选择索引nC对应的VLC(可变长度)表,该表选择索引nC是非零系数的数字nB和nA的平均值,作为在上部执行可变长度编码的编码值 基于输入图像(91),作为编码对象数据的量化系数中的4×4块作为编码对象的4相邻4×4块。 此时,在作为编码对象的4×4块位于MB的上端的情况下,图像编码装置(100)将上邻接的4×4块的非零系数的数量nB等同于 左邻接4×4块的非零系数的数量nA。 图像编码装置(100)使用所选择的VLC表对量化系数中的4×4块的非零系数的数量作为编码对象进行可变长度编码。