图像特效之随机滤波（Randomblue）

来源：互联网发布：大学生网络诈骗统计图编辑：程序博客网时间：2024/06/02 05:46

图像特效之随机滤波（Randomblue）

RandomBlue----图像中随机滤波，即在图像范围内，随机获取某一范围，在该范围内以一定半径进行平均滤波处理。

关键代码：

int Randblur(IMAGE_TYPE *bmp_img,int m_iAmount,int m_iRadius,int m_iSize){DWORD width,height,dst_index;WORD  biBitCount;T_U8 *bmp_data,*Result_img;T_U32 line_byte;DWORD i,j,k,l;DWORD x,y;// beginning coord (random)DWORD ex,ey; // end coord (from beginning)int rad;// blur radius (bluriness)int RAD; // total num pix processed per block int rad2; // half of the radiusint numBlurs,BytePerPixel = 3;float R,G,B,Tmp;BITMAPFILEHEADER bf;BITMAPINFOHEADER bi;FILE *Random_Blue_fp = fopen("Random_Blue_BMP.bmp","wb");if(NULL == Random_Blue_fp){printf("Can't open Random_Blue_BMP.bmp\n");return -1;}memset(&bf, 0, sizeof(bf));memset(&bi, 0, sizeof(bi));memcpy(&bf,bmp_img,14);memcpy(&bi,&bmp_img[14],40);height = bi.biHeight;width  = bi.biWidth;biBitCount = bi.biBitCount;//每一个像素由24 bits表示，即RGB分量每一个分量用8 bits表示line_byte =(width*3+3) & ~0x3;fwrite(&bf,sizeof(BITMAPFILEHEADER),1,Random_Blue_fp);fwrite(&bi,sizeof(BITMAPINFOHEADER),1,Random_Blue_fp);rad = m_iRadius;RAD = rad*rad;rad2 = rad/2;Result_img = (T_U8*)malloc(height*line_byte);if(Result_img == NULL){printf("Can't malloc for result ingage.\n");return -1;}bmp_data = bmp_img + BMPHEADSIZE;memset(Result_img,0,height*line_byte);memcpy(Result_img,bmp_data,height*line_byte);for(numBlurs= 0;numBlurs <  m_iAmount;numBlurs++){do{y = (int)(rand() * ((double)height / RAND_MAX));x = (int)(rand() * ((double)width / RAND_MAX));ex = x + m_iSize - 1;ey = y + m_iSize - 1;} while (ex >= width || ey >= height); for (i = y + rad2; i < ey - rad2; i++){for (j = x + rad2; j < ex - rad2; j++){dst_index = i*line_byte+3*j;R = G = B = 0;for (k = 0; k < rad; k++){for (l = 0; l < rad; l++){R += (float)bmp_data[(i+k-rad2)*line_byte+(j+l-rad2)*3+2];G += (float)bmp_data[(i+k-rad2)*line_byte+(j+l-rad2)*3+1];B += (float)bmp_data[(i+k-rad2)*line_byte+(j+l-rad2)*3];}}Result_img[dst_index] = CLIP255((int)(B/RAD));Result_img[dst_index+1] = CLIP255((int)(G/RAD));Result_img[dst_index+2] = CLIP255((int)(R/RAD));}}}fwrite(Result_img, line_byte*height*sizeof(T_U8), 1, Random_Blue_fp);    fclose(Random_Blue_fp);      free(Result_img);return 0;}

实际结果：

左侧为原始图，右侧围随机滤波之后的图像

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