问题
I'm interested in creating a program capable of recognition of numbers, letters, symbols from an image. But first off, I went ahead and started to think about: How your system displays a letter?
There are so many fonts, font-sizes and other characteristics. I suppose there is an equation used to generate a letter with given parameters, is that true? Or are there other ways in which your system generates letters?
I found such a basic thing so interesting, and I can’t find any information on the web. Any ideas?
回答1:
Each character is universally assigned a code.
A font really is a mapping from a code (character) to glyph (instructions on how to draw the character).
A glyph is a collection of paths.
A path is a string that really is coded instructions on where/how to draw the various points, lines, and curves. A glyph has more than one path because some characters have holes (like R) and/or disjoint parts (like j). (So it's not an equation that describes how to draw characters.)
The OS and/or some programs know how to interpret the glyph data and translate that to pixels on the screen.
来源：https://stackoverflow.com/questions/13832387/how-does-the-computer-draw-a-letter