图像缩放_OpenCv

图像缩放是一种比较简单的图像处理操作，这里给出opencv中的代码，

opencv的版本C语言接口

int resize_c()

{

    const char *pstrImageName = "lena.jpg";

    const char *pstrSaveImageName = "lena缩放图.jpg";

    const char *pstrWindowsSrcTitle = "原图";

    const char *pstrWindowsDstTitle = "缩放图 ";



    double fScale = 0.8;        //缩放倍数

    CvSize czSize;                //目标图像尺寸



    //从文件中读取图像  

    IplImage *pSrcImage = cvLoadImage(pstrImageName, CV_LOAD_IMAGE_UNCHANGED);

    IplImage *pDstImage = NULL;    



    //计算目标图像大小

    czSize.width = pSrcImage->width * fScale;

    czSize.height = pSrcImage->height * fScale;



    //创建图像并缩放

    pDstImage = cvCreateImage(czSize, pSrcImage->depth, pSrcImage->nChannels);

    cvResize(pSrcImage, pDstImage, CV_INTER_AREA);



    //创建窗口

    cvNamedWindow(pstrWindowsSrcTitle, CV_WINDOW_AUTOSIZE);

    cvNamedWindow(pstrWindowsDstTitle, CV_WINDOW_AUTOSIZE);



    //在指定窗口中显示图像

    cvShowImage(pstrWindowsSrcTitle, pSrcImage);

    cvShowImage(pstrWindowsDstTitle, pDstImage);



    //等待按键事件

    cvWaitKey();



    //保存图片

    cvSaveImage(pstrSaveImageName, pDstImage);



    cvDestroyWindow(pstrWindowsSrcTitle);

    cvDestroyWindow(pstrWindowsDstTitle);

    cvReleaseImage(&pSrcImage);

    cvReleaseImage(&pDstImage);

    return 0;

}

 

C++版本

int resize_cpp()

{

    string pstrImageName = "lena.jpg";

    string pstrSaveImageName = "lena缩放图.jpg";

    string pstrWindowsSrcTitle = "原图";

    string pstrWindowsDstTitle = "缩放图 ";



    double fScale = 0.8;        //缩放倍数

    Size czSize;                //目标图像尺寸



    //从文件中读取图像  

    Mat pSrcImage = imread(pstrImageName);

    

    //计算目标图像大小

    czSize.width = pSrcImage.cols * fScale;

    czSize.height = pSrcImage.rows * fScale;



    //创建图像并缩放

    Mat pDstImage  = Mat(czSize, CV_8UC3);

    resize(pSrcImage, pDstImage, czSize,CV_INTER_AREA);



    //创建窗口

    namedWindow(pstrWindowsSrcTitle, CV_WINDOW_AUTOSIZE);

    namedWindow(pstrWindowsDstTitle, CV_WINDOW_AUTOSIZE);



    //在指定窗口中显示图像

    imshow(pstrWindowsSrcTitle, pSrcImage);

    imshow(pstrWindowsDstTitle, pDstImage);



    //等待按键事件

    waitKey();

    return 0;

}