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    • 10. 发明授权
    • Adaptive type quantizer
    • 自适应型量化器
    • US4386366A
    • 1983-05-31
    • US244478
    • 1981-03-16
    • Sumio Mori
    • Sumio Mori
    • G01D5/249G06T9/00H04N1/40H04N1/41H04N7/12H04N7/30H04N7/32
    • H04N19/90H04N19/124H04N19/126H04N19/149H04N19/50H04N19/60H04N19/146
    • A method for adaptively equalizing sampled input picture element values in which an estimation error obtained from a sampled input picture element value and the estimation value thereof are adaptively quantized by selecting one of a plurality of quantization characteristics. Quantization steps are determined in accordance with the desired quantization characteristics. Input groups of picture elements are divided into adjacent blocks and a quantization characteristic used for succeeding blocks is determined according to the distribution of quantization level values of preceding blocks. A quantization characteristic selecting unit selects a quantization characteristic set by the quantization characteristic determining unit from among a plurality of quantization characteristics. The estimation errors are quantized in a predetermined block using the quantization characteristic which is so selected.
    • 一种自适应均衡采样输入像素值的方法,其中通过选择多个量化特性之一来自适应地量化从采样输入像素值获得的估计误差及其估计值。 量化步骤根据期望的量化特性确定。 图像元素的输入组被划分为相邻块,并且根据前面块的量化级别值的分布来确定用于后续块的量化特性。 量化特征选择单元从多个量化特性中选择由量化特性确定单元设置的量化特性。 使用如此选择的量化特性,在预定块中量化估计误差。