Advanced.c

#include "Advanced.h"


#include <stdlib.h>
#include <time.h>
#include <stdio.h>


/* Add noise to an image */
void Noise(int n, unsigned char R[WIDTH][HEIGHT], unsigned char G[WIDTH][HEIGHT], unsigned char B[WIDTH][HEIGHT])
{
	int x, y, i;
	int num; /* number of noise added */
	num = ( n*HEIGHT*WIDTH )/100;
	srand(time(NULL));

	for ( i = 0; i < num; i++ ) {
		x = ( (double)rand()/RAND_MAX )*(WIDTH-1);
		y = ( (double)rand()/RAND_MAX )*(HEIGHT-1);
		R[x][y] = 255;
		G[x][y] = 255;
		B[x][y] = 255;
	}
}


/* sharpen the image */
void Sharpen(unsigned char R[WIDTH][HEIGHT], unsigned char G[WIDTH][HEIGHT], unsigned char B[WIDTH][HEIGHT])
{
	int		x, y, m, n, a, b;
	int		tmpR = 0;
	int		tmpG = 0;
	int		tmpB = 0;
	
	unsigned char	R_tmp[WIDTH][HEIGHT];
	unsigned char	G_tmp[WIDTH][HEIGHT];
	unsigned char	B_tmp[WIDTH][HEIGHT];

	for (y = 0; y < HEIGHT; y++){
		for (x = 0; x < WIDTH; x++) {
			R_tmp[x][y] = R[x][y];
			G_tmp[x][y] = G[x][y];
			B_tmp[x][y] = B[x][y];
		}
	}

	for (y = 0; y < HEIGHT; y++){
		for (x = 0; x < WIDTH; x++){
			for (n = -1; n <= 1; n++){
				for (m = -1; m <= 1; m++) {
					a = x + m;
					b = y + n;
					if (a > WIDTH - 1)
						a = WIDTH - 1;
					if (a < 0)
						a = 0;
					if (b > HEIGHT - 1)
						b = HEIGHT - 1;
					if (b < 0)
						b = 0;
					
					if ((n==0)&&(m==0))
					{
						tmpR += 9*R_tmp[a][b] ; 
						tmpG += 9*G_tmp[a][b] ; 
						tmpB += 9*B_tmp[a][b] ; 
					}
					else
					{
						tmpR -= R_tmp[a][b] ; 
						tmpG -= G_tmp[a][b] ; 
						tmpB -= B_tmp[a][b] ; 
					}
				}
			}
			R[x][y] = (tmpR>255)? 255: (tmpR<0)? 0: tmpR ;
			G[x][y] = (tmpG>255)? 255: (tmpG<0)? 0: tmpG ;
			B[x][y] = (tmpB>255)? 255: (tmpB<0)? 0: tmpB ;
		  	tmpR = tmpG = tmpB = 0; 	
		}
	}
}

/* make the image posterized */
void Posterize(unsigned char R[WIDTH][HEIGHT], unsigned char G[WIDTH][HEIGHT], unsigned char B[WIDTH][HEIGHT], unsigned int rbits, unsigned int gbits, unsigned int bbits)
{
	int x, y;
	for(x=0; x<WIDTH; x++) {
		for(y=0; y<HEIGHT; y++) {
			unsigned char one = 1;
			int i;
			for(i=0; i<rbits-1; i++) {
				R[x][y] |= one;
				one <<= 1;
			}
			one = ~one;
			R[x][y] &= one;

			one = 1;
			for(i=0; i<gbits-1; i++) {
				G[x][y] |= one;
				one <<= 1;
			}
			one = ~one;
			G[x][y] &= one;

			one = 1;
			for(i=0; i<bbits-1; i++) {
				B[x][y] |= one;
				one <<= 1;
			}
			one = ~one;
			B[x][y] &= one;
		}
	}
}

/* add motion blur to the image */
void MotionBlur(int BlurAmount, unsigned char R[WIDTH][HEIGHT], unsigned char G[WIDTH][HEIGHT], unsigned char B[WIDTH][HEIGHT])
{
	int x,y,m;
	unsigned int temp_r , temp_g , temp_b;

	for (x = 0; x < WIDTH; x++)
        	for (y = 0; y < HEIGHT ; y++) 
		{
			temp_r = R[x][y]/2;
			temp_b = B[x][y]/2;
			temp_g = G[x][y]/2;
			
			for (m = 1; m<=BlurAmount ; m++)
			{
				if ((x+m) < WIDTH)
				{
					temp_r = temp_r + R[x+m][y] * 0.5/BlurAmount;
					temp_b = temp_b + B[x+m][y] * 0.5/BlurAmount;
					temp_g = temp_g + G[x+m][y] * 0.5/BlurAmount;
				}
			}
			
			R[x][y]= temp_r;
			B[x][y]= temp_b;
			G[x][y]= temp_g;
		}	
}


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