图像运算(五)——混合(blending)

描述：两幅图像各占一定比例的进行混合成一个图像，但是两个占的百分比等于1，

公式描述：O(i,j) = P * I1(i,j) + (1-P) * I2(i,j)， 其中P就是混合比(blending ratio)

Code:

  /**
   *Applies the image Blend operator on the specified image arrays,
   *with the specified offset and scale value
   *@param src1_1d The first source image as a pixel array
   *@param src2_1d The second source image as a pixel array
   *@param blend The blending factor a float from 0..1
   *@param width width of the destination image in pixels
   *@param height height of the destination image in pixels
   *@param oset The offset value
   *@param scale The scale value
   *@return A pixel array containing the blended image
   */

public int [] DoBlend(int [] src1_1d, int [] src2_1d, float blend,
			int width, int height, float oset, float scale ){
    
    int place1 = -1;
    int place2 = -1;
    int src1rgb = 0;
    int src2rgb = 0;
    int result = 0;
    //Get size of image and make 1d_arrays
    d_w = width;
    d_h = height;
    
    
    dest_1d = new int[d_w*d_h];
    
    boolean firstwider = false;
    boolean secondwider = false;
    int wrap;
    
    if (i1_w > d_w){
      wrap =   ((i1_w + 1) - d_w);
      firstwider = true;
    } else if (i2_w > d_w){
      wrap =    ((i2_w + 1) - d_w);
      secondwider = true;
      
    } else {
      wrap = 0;
    }
    
    //if you know there is no wrap around, you can save yourself some time
    
    if (wrap == 0) {
      for (int i=0; i< dest_1d. length ; i++){
	src2rgb = src2_1d[i] & 0x000000ff;
	src1rgb = src1_1d[i] & 0x000000ff;
	result = (int) ((scale * ( blend * src1rgb + ( 1 - blend ) * src2rgb )) + oset);
	if (result < 0){
	  result = 0;
	} else if  (result > 255){
	  result = 255;
	}
	
	//create an int value for dest_1d
	dest_1d[i ] =  0xff000000 | (result + (result << 16) + (result << 8));
	
      }
      
      return dest_1d;
      
    }
    else {
     
      for (int i=0; i< dest_1d. length ; i++){
    
	//we might need to skip out some pixels which aren't in the overlap area
	
	if ((i %d_w  ) == 0 ) {
	  if ( i == 0 ){
	    place1 = 0;
	    place2 = 0;
	  } else if (secondwider) {
	    place2 = place2 + wrap;
	    place1 ++;
	  } else if (firstwider){
	    place1 = place1 + wrap;
	    place2 ++;
	  }
	} else{
	  place2 ++;
	  place1 ++;
	}
	
      src2rgb = src2_1d[place2] & 0x000000ff;
      src1rgb = src1_1d[place1] & 0x000000ff;
      
      result = (int) ((scale * ( blend * src1rgb + (1 - blend) * src2rgb )) + oset);
      if (result < 0){
	result = 0;
      } else if  (result > 255){
	result = 255;
      }
      
      //create an int value for dest_1d
      dest_1d[i ] =  0xff000000 | (result + (result << 16) + (result << 8));
      }
      return dest_1d;
    }
  }

Input Image:

P = 0.5

Output Image:

总结：实际上这个运算的效果是引起我学习图像处理的一个冲击力，感觉视觉效果很好，只是现在说来有点可笑而已。

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