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    • 90. 发明授权
    • Image coding method, image coding/decoding method, image coder, or image recording/reproducing apparatus
    • 图像编码方法,图像编码/解码方法,图像编码器或图像记录/再现装置
    • US06792152B1
    • 2004-09-14
    • US09623397
    • 2000-10-27
    • Hideaki ShibataHideki FukudaKazuhiko Nakamura
    • Hideaki ShibataHideki FukudaKazuhiko Nakamura
    • G06K936
    • H04N19/98H04N19/117H04N19/124H04N19/126H04N19/139H04N19/14H04N19/15H04N19/17H04N19/172H04N19/176H04N19/182H04N19/186H04N19/60H04N19/80
    • An image coding apparatus according to the present invention is provided with, as shown in FIG. 4, a blocking circuit 401 for dividing an input image signal into two-dimensional blocks each comprising plural pixels; a frequency distribution verifier 408 for calculating the average and variance from a plurality of image feature data 402 to 407 and the frequency distribution of each feature data for each block in a predetermined period; a filter characteristic decider 409, a filter circuit 410, and an encoder 411. In the image coding apparatus so constructed, the input image signal is divided into local regions each comprising plural pixels, the image feature data of each local region is extracted, the average and the variance of the extracted image feature data are calculated from the frequency distribution of the image feature data for a predetermined period, and a filter characteristic and a quantization step are decided for each local region according to the degree of singularity of each local region. Thereby, the quantity of generated codes can be controlled more precisely as compared with the conventional apparatus, and a portion of the decoded image where coding noise is conspicuous can be locally suppressed.
    • 根据本发明的图像编码装置具有如图1所示的图像编码装置。 4,用于将输入图像信号划分成每个包括多个像素的二维块的分块电路401; 用于计算多个图像特征数据402至407的平均值和方差的频率分布验证器408以及预定周期中每个块的每个特征数据的频率分布; 滤波器特性判定器409,滤波器电路410和编码器411.在这样构成的图像编码装置中,将输入图像信号分割成包括多个像素的局部区域,提取每个局部区域的图像特征数据, 根据预定时段的图像特征数据的频率分布计算提取的图像特征数据的平均值和方差,并且根据每个局部区域的奇异度对每个局部区域确定滤波特性和量化步长 。 由此,与传统装置相比,可以更准确地控制所生成的代码量,并且可以局部地抑制编码噪声明显的解码图像的一部分。