//
//??alphaBlend.cpp
//??
//
//??Created?by?Sunita?Nayak?on?3/14/17.
//
//

#include?

using?namespace?cv;
using?namespace?std;

//?Alpha?blending?using?multiply?and?add?functions
Mat&?blend（Mat&?alpha?Mat&?foreground?Mat&?background?Mat&?outImage）
{
????Mat?fore?back;
????multiply（alpha?foreground?fore）;
????multiply（Scalar::all（1.0）-alpha?background?back）;
????add（fore?back?outImage）;
????
????return?outImage;
}

//?Alpha?Blending?using?direct?pointer?access
Mat&?alphaBlendDirectAccess（Mat&?alpha?Mat&?foreground?Mat&?background?Mat&?outImage）
{

????int?numberOfPixels?=?foreground.rows?*?foreground.cols?*?foreground.channels（）;
????
????float*?fptr?=?reinterpret_cast（foreground.data）;
????float*?bptr?=?reinterpret_cast（background.data）;
????float*?aptr?=?reinterpret_cast（alpha.data）;
????float*?outImagePtr?=?reinterpret_cast（outImage.data）;

????int?ij;
????for?（?j?=?0;?j?????{
????????*outImagePtr?=?（*fptr）*（*aptr）?+?（*bptr）*（1?-?*aptr）;
????}
????
????return?outImage;
}


int?main（int?argc?char**?argv）
{
????
????//?Read?in?the?png?foreground?asset?file?that?contains?both?rgb?and?alpha?information
????Mat?foreGroundImage?=?imread（“foreGroundAssetLarge.png“?-1）;
????Mat?bgra[4];
????split（foreGroundImage?bgra）;//split?png?foreground
????
????//?Save?the?foregroung?RGB?content?into?a?single?Mat
????vector?foregroundChannels;
????foregroundChannels.push_back（bgra[0]）;
????foregroundChannels.push_back（bgra[1]）;
????foregroundChannels.push_back（bgra[2]）;
????Mat?foreground?=?Mat::zeros（foreGroundImage.size（）?CV_8UC3）;
????merge（foregroundChannels?foreground）;
????
????//?Save?the?alpha?information?into?a?single?Mat
????vector?alphaChannels;
????alphaChannels.push_back（bgra[3]）;
????alphaChannels.push_back（bgra[3]）;
????alphaChannels.push_back（bgra[3]）;
????Mat?alpha?=?Mat::zeros（foreGroundImage.size（）?CV_8UC3）;
????merge（alphaChannels?alpha）;
???
????//?Read?background?image
????Mat?background?=?imread（“backGroundLarge.jpg“）;
????
????//?Convert?Mat?to?float?data?type
????foreground.convertTo（foreground?CV_32FC3）;
????background.convertTo（background?CV_32FC3）;
????alpha.convertTo（alpha?CV_32FC3?1.0/255）;?//?keeps?the?alpha?values?betwen?0?and?1

????//?Number?of?iterations?to?average?the?performane?over
????int?numOfIterations?=?1;?//1000;
????
????//?Alpha?blending?using?functions?multiply?and?add
????Mat?outImage=?Mat::zeros（foreground.size（）?foreground.type（））;
????double?t?=?（double）getTickCount（）;
????for?（int?i=0;?i????????outImage?=?blend（alpha?foreground?background?outImage）;
????}
????t?=?（（double）getTickCount（）?-?t）/getTickFrequency（）;
????cout?<
????//?Alpha?blending?using?direct?Mat?access?with?for?loop
????outImage?=?Mat::zeros（foreground.size（）

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2018-06-20?16:20??learnopencv-master\
?????文件??????????10??2018-06-20?16:20??learnopencv-master\.gitignore
?????目錄???????????0??2018-06-20?16:20??learnopencv-master\AlphaBlending\
?????文件?????????254??2018-06-20?16:20??learnopencv-master\AlphaBlending\README.md
?????文件????????3459??2018-06-20?16:20??learnopencv-master\AlphaBlending\alphaBlend.cpp
?????文件?????????862??2018-06-20?16:20??learnopencv-master\AlphaBlending\alphaBlend.py
?????文件??????495797??2018-06-20?16:20??learnopencv-master\AlphaBlending\backGround.jpg
?????文件??????735761??2018-06-20?16:20??learnopencv-master\AlphaBlending\backGroundLarge.jpg
?????文件?????1718187??2018-06-20?16:20??learnopencv-master\AlphaBlending\foreGroundAsset.png
?????文件?????6353004??2018-06-20?16:20??learnopencv-master\AlphaBlending\foreGroundAssetLarge.png
?????目錄???????????0??2018-06-20?16:20??learnopencv-master\BlobDetector\
?????文件?????????251??2018-06-20?16:20??learnopencv-master\BlobDetector\README.md
?????文件????????1555??2018-06-20?16:20??learnopencv-master\BlobDetector\blob.cpp
?????文件???????16934??2018-06-20?16:20??learnopencv-master\BlobDetector\blob.jpg
?????文件????????1202??2018-06-20?16:20??learnopencv-master\BlobDetector\blob.py
?????目錄???????????0??2018-06-20?16:20??learnopencv-master\ColorSpaces\
?????文件?????????239??2018-06-20?16:20??learnopencv-master\ColorSpaces\README.md
?????文件????????3281??2018-06-20?16:20??learnopencv-master\ColorSpaces\dataAnalysis.py
?????目錄???????????0??2018-06-20?16:20??learnopencv-master\ColorSpaces\images\
?????文件???????28785??2018-06-20?16:20??learnopencv-master\ColorSpaces\images\rub00.jpg
?????文件???????20412??2018-06-20?16:20??learnopencv-master\ColorSpaces\images\rub01.jpg
?????文件???????24052??2018-06-20?16:20??learnopencv-master\ColorSpaces\images\rub02.jpg
?????文件???????24097??2018-06-20?16:20??learnopencv-master\ColorSpaces\images\rub03.jpg
?????文件???????19618??2018-06-20?16:20??learnopencv-master\ColorSpaces\images\rub04.jpg
?????文件???????27214??2018-06-20?16:20??learnopencv-master\ColorSpaces\images\rub05.jpg
?????文件???????40374??2018-06-20?16:20??learnopencv-master\ColorSpaces\images\rub06.jpg
?????文件???????33204??2018-06-20?16:20??learnopencv-master\ColorSpaces\images\rub07.jpg
?????文件???????30914??2018-06-20?16:20??learnopencv-master\ColorSpaces\images\rub08.jpg
?????文件???????29708??2018-06-20?16:20??learnopencv-master\ColorSpaces\images\rub09.jpg
?????文件????????3577??2018-06-20?16:20??learnopencv-master\ColorSpaces\interactiveColorDetect.cpp
?????文件????????2663??2018-06-20?16:20??learnopencv-master\ColorSpaces\interactiveColorDetect.py
............此處省略2362個文件信息