图像特效之水彩特效

图像特效之图像水彩特效

转载于风吹夏天博客

作者日期联系方式风吹夏天2015年10月31日wincoder#qq.com

关键代码实现：

int OilPaint(IMAGE_TYPE *bmp_img,int brushSize, int coarseness){DWORD width,height,dst_index,index,top,bottom,left,right;WORD  biBitCount;T_U8 *bmp_data,Gray,R,G,B,*GrayImage,*Result_img,BytePerPixel = 3;T_U32 line_byte,*RedAverage,*GreenAverage,*BlueAverage;T_U16 i,j,m,n,k;T_U8 chosenIntensity,intensity ;int lenArray,*CountIntensity,maxInstance;BITMAPFILEHEADER bf;BITMAPINFOHEADER bi;FILE *OilPaint_BMP_fp = fopen("OilPaint_BMP.bmp","wb");if(NULL == OilPaint_BMP_fp){printf("Can't open OilPaint_BMP.bmp\n");return -1;}if (brushSize < 1) brushSize = 1;    if (brushSize > 8) brushSize = 8;    if (coarseness < 1) coarseness = 1;    if (coarseness > 255) coarseness = 255;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,OilPaint_BMP_fp);fwrite(&bi,sizeof(BITMAPINFOHEADER),1,OilPaint_BMP_fp);lenArray =  coarseness + 1;CountIntensity = (int *)malloc(lenArray*sizeof(int));RedAverage = (T_U32*)malloc(lenArray*sizeof(T_U32));GreenAverage = (T_U32*)malloc(lenArray*sizeof(T_U32));BlueAverage = (T_U32*)malloc(lenArray*sizeof(T_U32));GrayImage = (T_U8*)malloc(height*line_byte*sizeof(T_U8));Result_img = (T_U8*)malloc(height*line_byte*sizeof(T_U8));if(GrayImage == NULL || CountIntensity == NULL || RedAverage == NULL || GreenAverage == NULL ||\            BlueAverage == NULL || Result_img == NULL){printf("Can't malloc for programm!\n");return -1;}memset(GrayImage,0,height*line_byte*sizeof(T_U8));memset(Result_img,0,height*line_byte*sizeof(T_U8));bmp_data = bmp_img + BMPHEADSIZE;        //转换为灰度图像for(i = 0;i < height;i++) {for(j = 0; j < width;j++){index = i*line_byte+3*j;B = bmp_data[index];G = bmp_data[index+1];R = bmp_data[index+2];Gray = (T_U8)((R*19661 + G*38666 + B*7409) >> 16);GrayImage[index] = Gray;GrayImage[index+1] = Gray;GrayImage[index+2] = Gray;}}for(i = 0;i < height;i++){top = i - brushSize;bottom = i+brushSize+1;if(top<0) top = 0;        if(bottom >=height) bottom = height - 1;dst_index = i*line_byte;for(j = 0;j < width;j++){left = j - brushSize;right = j + brushSize+1;if(left<0) left = 0;            if(right>=width) right = width - 1;              //数组初始化for(m = 0; m < lenArray;m++){CountIntensity[m] = 0;RedAverage[m] = 0;GreenAverage[m] = 0;BlueAverage[m] = 0;}for(m = top;m < bottom;m++){for(n = left;n < right;n++){index = m*line_byte+3*n;intensity = CLIP255((int)(coarseness*GrayImage[index]/255.0));CountIntensity[intensity]++; BlueAverage[intensity] += bmp_data[index]; GreenAverage[intensity]+= bmp_data[index+1]; RedAverage[intensity]  += bmp_data[index+2];}} chosenIntensity = 0; maxInstance = CountIntensity[0]; for(k=1;k<lenArray;k++)  { if(CountIntensity[k]>maxInstance) {chosenIntensity = (T_U8)k;maxInstance = CountIntensity[k];  } }                       //按照参考博文，计算出来得maxInstance有时候会为0，需要做处理 if(maxInstance == 0){ Result_img[dst_index] = bmp_data[dst_index]; Result_img[dst_index+1] = bmp_data[dst_index+1]; Result_img[dst_index+2] = bmp_data[dst_index+2]; } else{Result_img[dst_index]   = CLIP255((int)(BlueAverage[chosenIntensity] / ((float)(maxInstance))));Result_img[dst_index+1] = CLIP255((int)(GreenAverage[chosenIntensity] /((float) (maxInstance))));Result_img[dst_index+2] = CLIP255((int)(RedAverage[chosenIntensity] / ((float)(maxInstance)))); } dst_index = dst_index + BytePerPixel;}}    fwrite(Result_img, line_byte*height*sizeof(T_U8), 1, OilPaint_BMP_fp);    fclose(OilPaint_BMP_fp);      free(Result_img);    free(GrayImage);   free(GrayImage);   free(RedAverage);   free(GreenAverage);   free(BlueAverage);   free(CountIntensity); return 0;}

处理效果：