图像运算(九)——逻辑反(NOT)

描述：逻辑反操作即反向操作，正如二进制图像中，黑变成白，白变成黑

input output

0                1

1                0

公式描述：O(i,j) = (2^n -1) - I(i,j) ，n表示该图像是n-bits

Code:

  /**    
   *apply_invert applies an inversion operator to an image
   *@param src_1d The source image as a pixel array
   *@param width width of the destination image in pixels
   *@param height height of the destination image in pixels
   *
   *@return A pixel array containing the inverted input image
   */

  public int [] apply_invert(int [] src_1d, int width, int height) {
    
    d_w = width;
    d_h = height;
    dest_1d = new int[d_w * d_h];
    int src_rgb;
    int result = 0; 
    
    
    for(int i=0;i<src_1d.length;i++){

      src_rgb = src_1d[i] & 0x000000ff;
      result = 255 - src_rgb;
      
      //Convert back to 32 bit integer value
      dest_1d[i] = 0xff000000 | result<<16 | result<<8 | result;
      
    }
    
   return dest_1d; 
   
  }
}

Input Image:

Output Image :

总结：有时候反面能看清楚某事物的本质。