Image processing algorithm (2)

Ii. Color Removal
This function completes the grayscale processing of the image. Our basic idea is to take the average value of the three color components of each pixel point. However, due to the sensitivity of human eyes, the effect of completely average value acquisition is not good. Program In, I took three parameters with the best results:. 299,. 587,. 114. However, it should be noted that in GDI +, the image storage format is BGR rather than RGB, that is, the order is blue, green, and red. Therefore, you must set the values of red, green, blue, and other variables in the for loop. If the function is successfully executed, true is returned. 1 Public   Static   Bool Gray (Bitmap B)
2 {
3 Bitmapdata bmdata = B. lockbits ( New Rectangle ( 0 , 0 , B. Width, B. Height ),
4 Imagelockmode. readwrite, pixelformat. format24bpprgb );
5 Int Stride = Bmdata. stride;
6 System. intptr scan0 = Bmdata. scan0;
7 Unsafe
8 {
9 Byte   * P = ( Byte   * )( Void   * ) Scan0;
10 Int Noffset = Stride - B. Width * 3 ;
11 Byte Red, green, blue;
12 For ( Int Y = 0 ; Y < B. height; ++ Y)
13 {
14 For ( Int X = 0 ; X < B. width; ++ X)
15 {
16 Blue = P [ 0 ];
17 Green = P [ 1 ];
18 Red = P [ 2 ];
19 P [ 0 ] = P [ 1 ] = P [ 2 ] = ( Byte )(. 299   * Red + . 587   * Green + . 114   * Blue );
20 P + =   3 ;
21 }
22 P + = Noffset;
23 }
24 }
25 B. unlockbits (bmdata );
26 Return   True ;
27 }