modules/quality2SE.h

#ifndef QUALITY2SE_HEADER_
#define QUALITY2SE_HEADER_

#include "../headers.h"



class MQuality2SE_std: public IQuality2SE {

    DECLARE_TypeInfo_noSettings( MQuality2SE_std, "Constant square error"
    , "Holds the same <b>square error</b> (SE) for all block sizes" )

public:
    float rangeSE(float quality,int /*pixelCount*/) {
        ASSERT( quality>=0 && quality<=1 );
        float maxSE= 4  //  approximate SE for quality=0
        , doubles= 6;   //< how many times the SE doubles
        return maxSE/exp2(doubles) * ( exp2((1-quality)*doubles) - 1 );
    }
};



class MQuality2SE_alt: public IQuality2SE {

    DECLARE_TypeInfo_noSettings( MQuality2SE_alt, "Constant mean square error"
    , "Holds the same <b>mean square error</b> (MSE) for all block sizes" )

public:
    float rangeSE(float quality,int pixelCount) {
        ASSERT( quality>=0 && quality<=1 );
        float maxSE= 4  //  approximate SE for quality=0
        , doubles= 6;   //< how many times the SE doubles
        float sizeQuot= pixelCount/sqr(9.0);
        return maxSE/exp2(doubles) * ( exp2((1-quality)*doubles) - 1 ) * sizeQuot;
    }
};


#endif // QUALITY2SE_HEADER_

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