一、积分图介绍

定义：图像左上方的像素点值的和；

在Adaboost算法中可用于加速计算Haar或MB-LBP特征值，如下图：

二、代码实现

#include 
     
      #include 
      
       #include 
       
        using namespace cv;int calcIntImage(unsigned char *pucSrcImage, unsigned int *pucDstImage, int width, int height);int main(int argv, char **argc){    IplImage *pstImage = cvLoadImage("D:\\test01.JPG", CV_LOAD_IMAGE_COLOR);    IplImage *pstYUVImage = cvCreateImage(cvSize(pstImage->width, pstImage->height), IPL_DEPTH_8U, 3);    unsigned char *pucImage = (unsigned char*)malloc(pstImage->width * pstImage->height * sizeof(unsigned char));    unsigned int *puiIntImage = (unsigned int*)malloc((pstImage->width + 1) * (pstImage->height + 1) * sizeof(unsigned int));    cvCvtColor(pstImage, pstYUVImage, CV_BGR2YUV);    for(int i = 0; i < pstImage->width * pstImage->height; i++)    {        //提取Y分量        pucImage[i] = pstYUVImage->imageData[i*3];    }        /* 计算积分图 */    calcIntImage(pucImage, puiIntImage, pstImage->width, pstImage->height);    /* 测试代码，测试是否计算正确 */    for(int i = 0; i < 5; i++)    {        for(int j = 0; j < 5; j++)        {            printf("%d ", (int)(pucImage[i*pstImage->width + j]));        }        printf("\n");    }    printf("\n");    for(int i = 0; i < 6; i++)    {        for(int j = 0; j < 6; j++)        {            printf("%4d ", (int)(puiIntImage[i*(pstImage->width + 1) + j]));        }        printf("\n");    }    /* 测试代码结束 */    cvShowImage("Win", pstImage);    cvWaitKey(0);    cvReleaseImage(&pstImage);    cvReleaseImage(&pstYUVImage);    if(NULL != pucImage)    {        free(pucImage);        pucImage = NULL;    }    if(NULL != puiIntImage)    {        free(puiIntImage);        puiIntImage = NULL;    }    return 0;}int calcIntImage(unsigned char *pucSrcImage, unsigned int *puiDstImage, int width, int height){    int i= 0, j = 0, sum = 0;    int iIntImageWidth = width + 1;    int iIntImageHeight = height + 1;    unsigned char *pucSrcImageTmp;    unsigned int *puiDstImageTmp;        pucSrcImageTmp = pucSrcImage;    /* 存储每列的和 */    unsigned int *puiImageRow = (unsigned int *)malloc(width * sizeof(unsigned int));    memset(puiImageRow, 0, width * sizeof(unsigned int));    puiDstImageTmp = puiDstImage;    /* 积分图第一行清0 */    memset(puiDstImageTmp, 0, iIntImageWidth);    puiDstImageTmp += iIntImageWidth;    /* 积分图第一列清0 */    for(i = 0; i < height; i++)    {       *puiDstImageTmp = 0;       puiDstImageTmp += iIntImageWidth;    }    puiDstImageTmp = puiDstImage + iIntImageWidth;    /* 开始计算积分图 */    for(i = 0; i < height; i++)    {        for(j = 0; j < width; j++)        {            puiImageRow[j] += pucSrcImageTmp[j];            puiDstImageTmp[j+1] = puiDstImageTmp[j] + puiImageRow[j];        }        puiDstImageTmp += iIntImageWidth;        pucSrcImageTmp += width;    }    if(NULL != puiImageRow)    {        free(puiImageRow);        puiImageRow = NULL;    }    return 0;}