matlab实现LZW编码
时间: 2023-10-14 07:06:36 浏览: 195
LZW编码是一种无损数据压缩算法,下面是Matlab实现LZW编码的示例代码:
```matlab
function compressed = lzw_encode(text)
% text为需要编码的文本
dict = string(char(0:255))'; % 初始字典包含所有ASCII字符
n = 256; % 字典大小
current = string(text(1));
compressed = [];
for i = 2:length(text)
next = string(text(i));
if any(strcmp(dict, current + next)) % 如果当前字符串接下来的字符在字典中
current = current + next;
else % 否则输出当前字符串的编码并将当前字符串+下一个字符添加到字典中
compressed = [compressed find(strcmp(dict, current))];
dict{n+1} = current + next;
n = n + 1;
current = next;
end
end
% 输出最后一个字符的编码
compressed = [compressed find(strcmp(dict, current))];
end
```
这个函数接受一个字符串作为输入,返回一个包含编码后的数字序列的向量。注意,这个实现使用了字符串数组来表示字典和当前字符串,需要Matlab 2016b或更高版本支持。
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