:param cfg_item: a sub cfg item in default.yml, it should contain enable and fraction. such as prydown: enabl

percent: 0 ~ 1, e.g: 如果 percent=0.1，有 10% 的可能性

Generate a labels.txt file

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

:param img: gray image, will be convert to BGR image :param pnts: left-top, right-top, right-bottom, left-bottom :param color: :retur

Read corpus from disk to memory

Load txt file path in corpus_dir

Get font supported chars and unsupported chars :param ttf: TTFont ojbect :param charset: chars :return: unsupported_chars, supported_

Check whether sum of all fractions in cfg equal to 1 :param cfg: noise/line cfg

Crop text from large input image :param img: image to crop :param text_box_pnts_transformed: text_bbox_pnts after apply_persp

:param line: [[x1,y1],[x2,y2],[x3,y3],[x4,y4]] 矩形四点坐标的顺序： left-top, right-top, right-bottom, left-bottom

:param x/y: 应该是移除了 offset 的

loads/saves font supported chars from cache file :param fonts: list of font path. e.g ['./data/fonts/msyh.ttc'] :param chars_file: arg fr

Get word size removed offset :param font: truetype :param word: :return: size: word size, removed offset

Read ttc, ttf, otf font file, return a TTFont object

Get random left-top point for putting a small rect in a large rect. Normally dst_height>src_height and dst_width>src_width

Random crop text box height top or bottom, we don't need image information in this step, only change box pnts :param text_box_pnts: b

Apply perspective transform on image :param img: origin numpy image :param text_box_pnts: four corner points of text

模糊图像，模拟小图片放大的效果

Image name should be eight length with continue num. e.g. 00000000.jpg, 00000001.jpg

统计已经生成的 labels 中的字符频率 - 计算每个字符数量 - 计算字符平均数量 - 保存当前的低频词在语料中的索引

:param x/y: 应该是移除了 offset 的

Draw word in the center of background :param word: word to draw :param font: font to draw word :param bg: background

If random_space applied, text_x, text_y, word_width, word_height may change

Resize background, let bg_width>=width, bg_height >=height, and random crop from resized background

Generate random background

Load font path recursively from a folder :param fonts_dir: folder contains ttf、otf or ttc format font :return: path of all fonts

Only use word roi area to get word color

按照 zyx 的顺序旋转，输入角度单位为 degrees, 均为顺时针旋转 :param x: X-axis :param y: Y-axis :param z: Z-axis :return:

Get word line from corpus in memory :return: string

:param img_index when use list corpus, this param is used :return: font: truetype size: word size, removed of

:param pnts: 2D pnts, left-top, right-top, right-bottom, left-bottom :param M33: output from transform_image() :return: 2D pn

:param img: word image with big background