:param word_img: word image with big background :param text_box_pnts: left-top, right-top, right-bottom, left-bottom of text word

Gaussian-distributed additive noise.

Poisson-distributed noise generated from the data.

Salt and pepper noise. Replaces random pixels with 0 or 255.

共有 8 种可能的画法，横线横穿整张 word_img 0/1/2/3: 仅单边（左上右下） 4/5/6/7: 两边都有线（左上，右上，右下，左下）

Apply zero-mean uniform noise

:param mu: 均值 :param sigma3: 3 倍标准差， 99% 的数据落在 (mu-3*sigma, mu+3*sigma) :return:

Get fonts unsupported chars by loads/saves font supported chars from cache file :param fonts: :param chars_file: :return: dict

Load one corpus file as one line , and get random {self.length} words as result

special case, when the convertor needs full ArgInfo structure

listens for messages on the q, writes to file.

text_im : image containing text