text: #import <Foundation/Foundation.h>
  #import <CoreMedia/CoreMedia.h>
  
  typedef struct {
  	bool leftEdge;
  	bool rightEdge;
  	bool bottomEdge;
  	bool topEdge;
  	
  	bool face;
  	
  	bool focus;
  } DocumentPreflightResult;
  
  @interface DocumentPreflight : NSObject
  - (DocumentPreflightResult)preflight:(CGImageRef)frame;
  @end
  