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热词
    • 7. 发明授权
    • Image data coding apparatus and method capable of controlling amount of
codes
    • 能够控制代码量的图像数据编码装置和方法
    • US5291282A
    • 1994-03-01
    • US771791
    • 1991-10-04
    • Chihiro NakagawaHidetoshi Yamada
    • Chihiro NakagawaHidetoshi Yamada
    • G06T9/00H04N7/26H04N7/30H04N9/804H04N7/12
    • H04N9/8047H04N19/115H04N19/124H04N19/15H04N19/172H04N19/192H04N19/60H04N19/13H04N19/146H04N19/91
    • An image data coding apparatus includes a preprocessing unit for executing preprocessing including compression for input image data in units of screens to generate a preprocessed output. A quantizing unit quantizes the preprocessed output with a predetermined quantization width to generate a quantized output. A variable-length coding unit executes variable-length coding for the quantized output. A target-amount-of-codes output unit outputs information concerning a target amount of codes corresponding to one screen. A quantization width predicting unit predicts a suitable quantization width on the basis of the information from the variable-length coding unit to supply information concerning the predicted quantization width to the quantizing unit. The quantizing unit quantizes the preprocessed output generated by the preprocessing unit with the predicted quantization width included in the information from the quantization width predicting unit.
    • 图像数据编码装置包括:预处理单元,用于执行预处理,包括以屏幕为单位的输入图像数据的压缩,以产生预处理的输出。 量化单元以预定的量化宽度量化预处理输出,以产生量化输出。 可变长度编码单元对量化输出执行可变长度编码。 目标代码量输出单元输出与一个屏幕对应的目标代码量的信息。 量化宽度预测单元基于来自可变长度编码单元的信息预测适当的量化宽度,以向量化单元提供关于预测量化宽度的信息。 量化单元利用来自量化宽度预测单元的信息中包含的预测量化宽度量化由预处理单元生成的预处理输出。