图像融合 alpha (含代码)

　　在VisualStudio2008+openCV下实现的代码如下：

View Code

   
     

    
      //
    
       alphaBlending.cpp : 定义控制台应用程序的入口点。

    
      //

    
      
#include 
    
      "
    
      stdafx.h
    
      "
    
      
#include
    
      <
    
      cv.h
    
      >
    
      
#include
    
      <
    
      cxcore.h
    
      >
    
      
#include
    
      <
    
      highgui.h
    
      >
    
      

IplImage 
    
      *
    
      alphaBlending(IplImage 
    
      *
    
      src1,IplImage 
    
      *
    
      src2,
    
      double
    
       winSize)
{
 
    
      if
    
      (src1
    
      ->
    
      height
    
      !=
    
      src2
    
      ->
    
      height
    
      ||
    
      src1
    
      ->
    
      width
    
      !=
    
      src2
    
      ->
    
      width)
 {
 
    
      //
    
      the height and weight of two images must agree to blend
    
      

    
       
    
      return
    
       
    
      0
    
      ;
 }
 
    
      int
    
       w
    
      =
    
      src1
    
      ->
    
      width,h
    
      =
    
      src1
    
      ->
    
      height;
 
    
      int
    
       winStart
    
      =
    
      (
    
      int
    
      )(w
    
      *
    
      winSize
    
      /
    
      2
    
      ),winEnd
    
      =
    
      (
    
      int
    
      )(w
    
      -
    
      winStart);
 IplImage 
    
      *
    
      dst
    
      =
    
      cvCreateImage(cvGetSize(src1),IPL_DEPTH_8U,
    
      3
    
      );
 
    
      for
    
      (
    
      int
    
       i
    
      =
    
      0
    
      ;i
    
      <
    
      h;i
    
      ++
    
      )
 {
 
    
      for
    
      (
    
      int
    
       j
    
      =
    
      0
    
      ;j
    
      <
    
      w;j
    
      ++
    
      )
 {
 CvScalar p1,p2,p;
 
    
      double
    
       a
    
      =
    
      0
    
      ;
 
    
      if
    
      (j
    
      >
    
      winEnd)
 {
 a
    
      =
    
      1
    
      ;
 }
 
    
      else
    
       
    
      if
    
      (j
    
      >
    
      winStart)
 {
 a
    
      =
    
      (j
    
      -
    
      winStart)
    
      /
    
      (
    
      double
    
      )(winEnd
    
      -
    
      winStart);
 }
 
 p1
    
      =
    
      cvGet2D(src1,i,j);
 p2
    
      =
    
      cvGet2D(src2,i,j);
 
    
      for
    
      (
    
      int
    
       k
    
      =
    
      0
    
      ;k
    
      <
    
      3
    
      ;k
    
      ++
    
      )
 {
 p.val[k]
    
      =
    
      a
    
      *
    
      p2.val[k]
    
      +
    
      (
    
      1
    
      -
    
      a)
    
      *
    
      p1.val[k];
 }
 cvSet2D(dst,i,j,p);
 }
 }
 
    
      return
    
       dst;
}



    
      int
    
       _tmain(
    
      int
    
       argc, _TCHAR
    
      *
    
       argv[])
{
 IplImage 
    
      *
    
      src1
    
      =
    
      cvLoadImage(
    
      "
    
      apple.jpg
    
      "
    
      );
 IplImage 
    
      *
    
      src2
    
      =
    
      cvLoadImage(
    
      "
    
      orange.jpg
    
      "
    
      );
 IplImage 
    
      *
    
      dst
    
      =
    
      alphaBlending(src1,src2,
    
      0.9
    
      );
 cvNamedWindow(
    
      "
    
      左图片
    
      "
    
      );
 cvNamedWindow(
    
      "
    
      右图片
    
      "
    
      );
 cvNamedWindow(
    
      "
    
      混合图片
    
      "
    
      );
 cvShowImage(
    
      "
    
      左图片
    
      "
    
      ,src1);
 cvShowImage(
    
      "
    
      右图片
    
      "
    
      ,src2);
 cvShowImage(
    
      "
    
      混合图片
    
      "
    
      ,dst);
 cvWaitKey(
    
      0
    
      );
 
    
      return
    
       
    
      0
    
      ;
}