# CAPTCHA's implementation
[Various accompanying utilities]

Collaboration diagram for CAPTCHA's implementation:

## Classes

class | BackgroundDrawer
class | CellBackgroundDrawer
class | CircleBackgroundDrawer
class | CodeGenerator
class | Color
class | ColorArray
class | CurvedStringDrawer
class | Drawer
class | ErrorDrawer
class | InclinedStringDrawer
class | LinearStringDrawer
class | RandomLinesBackgroundDrawer
class | TextDrawer
class | TuringImage
class | WavesBackgroundDrawer