最近邻算法的图像缩放代码

来源：互联网发布：mac怎么制作ppt 编辑：程序博客网时间：2024/06/02 19:41

原理挺简单，不啰嗦，直接上代码了

void ImgResize(uchar* pSrcImg, uchar* pDstImg, int srcW, int srcH, int dstW, int dstH){double rateH = (double)srcH /(double) dstH;double rateW = (double)srcW / (double)dstW;for (int i=0; i<dstH; i++){int tSrcH = (int)(rateH*double(i) + 0.5);for (int j=0; j<dstW; j++){int tSrcW = (int)(rateW * double(j) + 0.5); pDstImg[i*dstW+j] = pSrcImg[tSrcH*srcW+tSrcW];}}}void ImgResizeTest(){cv::Mat srcImg = cv::imread("test.jpg", CV_LOAD_IMAGE_GRAYSCALE);if (srcImg.empty()){printf("srcImg load error \n");system("pause");exit(-1);}int srcW = srcImg.cols;int srcH = srcImg.rows;int dstW1 = 2*srcW + 5;int dstH1 = 2*srcH + 5;//随便设定int dstW2 = srcW/2 + 3;int dstH2 = srcH/2 + 3;uchar* pDstImg1 = new uchar[dstW1*dstH1];uchar* pDstImg2 = new uchar[dstW2*dstH2];ImgResize(srcImg.data, pDstImg1, srcW, srcH, dstW1, dstH1);ImgResize(srcImg.data, pDstImg2, srcW, srcH, dstW2, dstH2);cv::Mat dstImg1;dstImg1.create(dstH1,dstW1,CV_8UC1);memcpy(dstImg1.data, pDstImg1, dstW1*dstH1*sizeof(uchar));cv::Mat dstImg2;dstImg2.create(dstH2,dstW2,CV_8UC1);memcpy(dstImg2.data, pDstImg2, dstW2*dstH2*sizeof(uchar));cv::imshow("srcImg", srcImg);cv::imshow("dstImg1", dstImg1);cv::imshow("dstImg2", dstImg2);cv::waitKey(0);delete[] pDstImg1;}

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