ENCODING DEVICE AND METHOD, COMPOSITE DEVICE AND METHOD, AND TRANSMISSION SYSTEM

摘要

Provided are an encoding device and method, a decoding device and method, and a transmission system capable of rapidly encoding an image. A maximum valid digit quantity calculation unit (63) calculates the maximum valid number of digits of a predetermined number w of quantization coefficients. A VLC encoding unit (64) outputs a code indicating the maximum valid number of digits according to the calculation result. According to the maximum valid number of digits, a valid digit extraction unit (65) extracts a valid digit of each quantization coefficient from the w quantization coefficients. According to the extracted valid digit, a VLC encoding unit (66) outputs a code indicating an absolute value of the w quantization coefficients. A sign extraction unit (67) extracts a sign indicating whether each of the quantization coefficients is positive or negative from the w quantization coefficients. A VLC encoding unit (68) outputs w codes indicating the sign.