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    • 39. 发明授权
    • Coding apparatus, decoding apparatus, coding method, decoding method, amd computer-readable recording medium for executing the methods
    • 编码装置,解码装置,编码方法,解码方法,用于执行方法的计算机可读记录介质
    • US06788811B1
    • 2004-09-07
    • US09565545
    • 2000-05-05
    • Nekka MatsuuraTakahiro YagishitaYukiko Yamazaki
    • Nekka MatsuuraTakahiro YagishitaYukiko Yamazaki
    • G06K936
    • H04N19/60H04N11/044H04N19/63
    • A coding apparatus which can simplify a coding circuit and also simplify the processing of quantization. Image data that consists of R-, G-, and B-color components read from a scanner into buffers is subjected to transformation using a position correlation for each of RGB in position-correlation transformation sections. The DC component of each of the components is then color-converted in a color conversion section to be a DC lightness signal and DC color signals, and the signals are quantized in a quantization section and a coding section. Whereas, the AC components of each of the components are subjected to quantization in a first step in an AC component quantization section, and further to color conversion in a color conversion section to be an AC lightness signal and AC color signals. The signals are quantized in a second step in a quantization section and a coding section.
    • 一种可以简化编码电路并简化量化处理的编码装置。 由从扫描仪读取到缓冲器中的R,G和B颜色分量的图像数据使用位置相关变换部分中的每个RGB的位置相关性进行变换。 然后,将颜色转换部分中的每个分量的直流分量进行颜色转换为直流亮度信号和直流彩色信号,并且在量化部分和编码部分对信号进行量化。 而在AC分量量化部分中的每个分量的AC分量在第一步进行量化,并且进一步将颜色转换部分中的颜色转换为AC亮度信号和AC彩色信号。 在量化部分和编码部分中的第二步中量化信号。