| Class | Description | 
|---|---|
| QuadDetector | 
 Base class for all detectors that are used for  
Quadrilateral detection. | 
| QuadDetector.Result | |
| QuadWithSizeDetector | 
 Base class for all detectors  that are used for  
Quadrilateral
 detection and can also provide physical size of the detected document. | 
| QuadWithSizeDetector.Result | |
| Specification | 
 Base class for all specifications that can be used for detection. 
 |