Matlab提取特征值是经常要读取多个图片文件，把文件名保存在数组中后再读取会出错。从stackoverflow中找到如下解决方法：

I‘ve a M by N matrix, each cell contains a character array, that is an image path. How can I use it to read image? It should be string.

It‘s what I try to do:

imread(fl(1,1));??? Error using ==> imread>parse_inputs at 491The filename or url argument must be a string.Error in ==> imread at 336[filename, fmt_s, extraArgs, msg] = parse_inputs(varargin{:});

Replace fl(1,1) with fl{1,1}. You access the contents of a cell-array with {}. You access the cell element itself with ().

Since imread expects a string and not a cell element, it throws that error.

Convert character array to string in MATLAB