matlab算术编码解码

以下是MATLAB中算术编码的解码和编码的示例代码：

1. 算术编码的编码

function arith_encode(seq, prob)
    % seq: 待编码的序列
    % prob: 每个符号的概率
    % low: 算术编码的下界
    % high: 算术编码的上界
    % range: 算术编码的范围
    % code: 算术编码的结果
    low = 0;
    high = 1;
    range = 1;
    for i = 1:length(seq)
        symbol = seq(i);
        symbol_low = low + range * sum(prob(1:symbol-1));
        symbol_high = low + range * sum(prob(1:symbol));
        low = symbol_low;
        high = symbol_high;        range = high - low;
    end
    code = (low + high) / 2;
    disp(code);
end

2. 算术编码的解码

function arith_decode(code, prob, len)
    % code: 待解码的算术编码
    % prob: 每个符号的概率
    % len: 解码后的序列长度
    % low: 算术编码的下界
    % high: 算术编码的上界
    % range: 算术编码的范围
    % seq: 算术编码解码的结果
    seq = zeros(1, len);
    low = 0;
    high = 1;
    range = 1;
    for i = 1:len
        for j = 1:length(prob)
            symbol_low = low + range * sum(prob(1:j-1));
            symbol_high = low + range * sum(prob(1:j));
            if code >= symbol_low && code < symbol_high
                seq(i) = j;
                low = symbol_low;
                high = symbol_high;
                range = high - low;
                break;
            end
        end
    end
    disp(seq);
end