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    • 23. 发明申请
    • IMAGE ENCODING METHOD, IMAGE DECODING METHOD, IMAGE ENCODING APPARATUS, AND IMAGE DECODING APPARATUS
    • 图像编码方法,图像解码方法,图像编码装置和图像解码装置
    • US20160191932A1
    • 2016-06-30
    • US15059567
    • 2016-03-03
    • Panasonic Corporation
    • TADAMASA TOMATAKAHIRO NISHIKENGO TERADA
    • H04N19/37H04N19/156H04N19/164H04N19/172H04N19/187
    • An image encoding method includes: determining respective decoding times of a plurality of pictures included in a motion picture such that decoding times of a plurality of lower layer picture which do not belong to a highest layer of a plurality of layers are spaced at regular intervals, and decoding timing for each of the plurality of lower layer pictures is identical between a case where the plurality of encoded pictures included in the motion picture are decoded and a case where only the plurality of lower layer pictures are decoded, encoding each of the plurality of pictures included in the motion picture in accordance with the encoding order according to the determined respective decoding times, and generating an encoded stream including the plurality of encoded pictures and the determined respective decoding times for the plurality of pictures.
    • 图像编码方法包括:确定运动图像中包括的多个图像的各个解码时间,使得不属于多个层的最高层的多个下层图像的解码时间以规则的间隔隔开, 并且对于所述多个下层图像中的每一个图像的解码定时在所述运动图像中包括的所述多个编码图像被解码的情况与仅解码所述多个下层图像被解码的情况是相同的, 根据所确定的各个解码时间,根据编码顺序包括在运动图像中的图像,以及生成包括多个编码图像的编码流以及所确定的多个图像的解码时间。
    • 29. 发明授权
    • Variable rate coder/decoder system
    • 可变速率编码器/解码器系统
    • US5412484A
    • 1995-05-02
    • US94867
    • 1993-07-22
    • Hidetaka Yoshikawa
    • Hidetaka Yoshikawa
    • H03M7/30G06T9/00H04N19/102H04N19/126H04N19/136H04N19/154H04N19/166H04N19/196H04N19/36H04N19/37H04N19/423H04N19/503H04N19/60H04N19/61H04N19/625H04N19/91H04N1/415
    • H04N19/187H04N19/126H04N19/14H04N19/154H04N19/176H04N19/61H04N19/146H04N19/149H04N19/15H04N19/30
    • A variable rate coder/decoder system in which a quantizer, under control of a quantization controller, quantizes a signal obtained by subjecting discrete cosine transformation of a difference signal between an input signal and a signal from a frame memory storing therein a previous frame with a first quantization step width calculated based on a power value of the input signal calculated by a power calculator and a predetermined first signal-to-quantization noise ratio. In the system, further, a re-quantizer quantizes a difference signal between a signal being not quantized by the quantizer and a signal after the inverse quantization of an inverse quantizer with a second quantization step width calculated based on the power value controlled by a re-quantization controller and a predetermined second signal-to-quantization noise ratio. Variable length encoders subject the quantization output signals of the quantizer and re-quantizer to variable length encoding, decrease discard priority for the quantization output signal of the quantizer, increase discard priority for the quantization output signal of the re-quantizer, and then transmit them in the form of fixed-length cells or variable-length packets whereby, even when the amount of input data varies, its quality can be maintained constant and encoding and decoding can be realized with a high efficiency.
    • 一种可变速率编码器/解码器系统,其中量化器在量化控制器的控制下,通过对输入信号和来自其中存储先前帧的帧存储器的信号进行差分信号的离散余弦变换来获得的信号进行量化, 基于由功率计算器计算的输入信号的功率值和预定的第一信号到量化噪声比计算的第一量化步长。 此外,在该系统中,再量化器对由量化器未量化的信号与逆量化器的反量化后的信号之间的差分信号进行量化,其中第二量化步长基于由再次控制的功率值计算出的第二量化步长 量化控制器和预定的第二信号到量化噪声比。 可变长度编码器将量化器和重量化器的量化输出信号进行可变长度编码,降低量化器的量化输出信号的丢弃优先级,增加重新量化器的量化输出信号的丢弃优先级,然后传输 以固定长度单元或可变长度分组的形式,即使当输入数据量变化时,其质量可以保持恒定,并且可以以高效率实现编码和解码。