用直线逼近文字的外形，可以放大缩小图片，并生成字库。输入的图片一定要是.bmp文件，并且是黑白图片(可以有一定的灰度)。-Linear approximation of the shape of the text, you can zoom images, and generate font. The image must be an input. Bmp file, and is black and white picture (you can have some gray).