modules/quality2SE.h

   1 #ifndef QUALITY2SE_HEADER_
   2 #define QUALITY2SE_HEADER_
   3
   4 #include "../interfaces.h"
   5
   6 /** Standard quality-to-SE module - uses fixed SE for all block sizes */
   7 class MQuality2SE_std: public IQuality2SE {
   8
   9         DECLARE_TypeInfo_noSettings( MQuality2SE_std, "Constant square error"
  10         , "Holds the same <b>square error</b> (SE) for all block sizes" )
  11
  12 public:
  13 /**     \name IQuality2SE interface
  14  *      @{ */
  15         float rangeSE(float quality,int /*pixelCount*/) {
  16                 ASSERT( quality>=0 && quality<=1 );
  17                 float maxSE= 4  ///  approximate SE for quality=0
  18                 , doubles= 6;   ///< how many times the SE doubles
  19                 return maxSE/exp2(doubles) * ( exp2((1-quality)*doubles) - 1 );
  20         }
  21 ///     @}
  22 };
  23
  24
  25 #endif // QUALITY2SE_HEADER_