这里要注意,下面udata多分配了sizeof(void*)+CV_MALLOC_ALIGN的空间,前者是为了保存一个指向这片内存空间的地址;后者是为了对齐而预留的部分空间,对齐的目的是为了加快计算(比如在对齐的情况下才能运行的SIMD指令,一次能运行4个int的加法,共计128位); // 在64位机中,CV_MALLOC_ALIGN的宏定义是: // #define ...
returncv::fastMalloc( size ); } void* fastMalloc(size_t size) { uchar* udata = (uchar*)malloc(size + sizeof(void*) + CV_MALLOC_ALIGN); if(!udata) return OutOfMemoryError(size); uchar** adata = alignPtr((uchar**)udata +1, CV_MALLOC_ALIGN); // 分配的sizeof(void*)空间,用来...
cvAlloc 的函数调用cv::fastMalloc, fastMalloc函数用malloc分配的内存并进行了16字节对齐。 CV_IMPL void* cvAlloc( size_t size ) { returncv::fastMalloc( size ); } void* fastMalloc( size_t size ) { uchar* udata = (uchar*)malloc(size + sizeof(void*) + CV_MALLOC_ALIGN); if(!udata) r...
malloc创建对象, 要指定内存⼤⼩, 返回void *, 后续还需⾃⾏转换类型. 3. 虚函数 和 纯虚函数 virtual 纯虚函数: 没有被实现, 只是被定义好了 虚函数: 当基类指针指向⼀个⼦类对象a, 同时基类中也有a(⽗⼦中出现重名).基类声明了虚函数,则调⽤⼦的a, 否则调⽤基的a. [基中声明...
IplImage* img; //malloc memory by cvLoadImage or cvCreateImage for(int row = 0; row 《 img-》height; row++) { for (int col = 0; col 《 img-》width; col++) { b = CV_IMAGE_ELEM(img, UCHAR, row, col * img-》nChannels + 0); ...
IplImage* img; //malloc memory by cvLoadImage or cvCreateImagefor(int row = 0; row < img->height; row++){ for (int col = 0; col < img->width; col++) { b = CV_IMAGE_ELEM(img, UCHAR, row, col * img->nChannels + 0); g = CV_IMAGE_ELEM(img, UCHAR, row, col * img-...
IplImage* img; //malloc memory by cvLoadImage or cvCreateImage for(int row = 0; row < img->height; row++) { for (int col = 0; col < img->width; col++) { b = CV_IMAGE_ELEM(img, UCHAR, row, col * img->nChannels + 0); ...
std::vector buffer; // 将Mat数据编码为JPG格式并存储到buffer中 bool result = cv::imencode(".jpg", srcImage, buffer, compression_params); if(!result) { LOG_PRINT("[ERROR] imencode failed."); return false; } void * hostData = malloc(buffer.size()); memcpy(hostData, buffer.data()...
AVPacket *avPacket = (AVPacket *) av_mallocz(sizeof(AVPacket)); //创建一个用于存放解码之后的像素数据 AVFrame *avFrameIn = av_frame_alloc(); //创建SwsContext对象,用来初始化sws_scale库,以及相关的参数 struct SwsContext *swsContext = sws_getContext(avcodecParameters->width, ...
* float* dev_oImage = (float*)malloc(W * H * C * sizeof(float)); * * ppl::cv::arm::Add<float, 3>(H, W, W * C, dev_iImage0, W * C, dev_iImage1, W * C, dev_oImage); * ppl::cv::aarch64::Add<float, 3>(H, W, W * C, dev_iImage0, W * C, dev_iImage...