OpenCV用于内存缓冲区或文件指针 [英] OpenCV to use in memory buffers or file pointers

问题描述

openCV中的两个函数cvLoadImage和cvSaveImage接受文件路径作为参数。

例如，当保存图像时，它会 cvSaveImage（/ tmp / output.jpg，dstIpl），并写入磁盘。

有没有办法提供这个已经在内存中的缓冲区？因此，代替磁盘写入，输出映像将在内存中。

我也想知道这个cvSaveImage和cvLoadImage（读写内存缓冲区）。非常感谢！

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我的目标是存储Encoded（jpeg）在记忆中。同样的cvLoadImage，我想加载一个jpeg在内存中的IplImage格式。

解决方案

在SVN版本的库中有几个未记录的函数：

  CV_IMPL CvMat * cvEncodeImage（const char * ext，
 const CvArr * arr，const int * _params）
 
 CV_IMPL IplImage * cvDecodeImage （const CvMat * _buf，int iscolor）
  

最新签入消息声明他们是本地编码/或者，您可以使用标准图像编码库（例如libjpeg），并操作IplImage中的数据，以便对bmp，png，ppm和tiff（仅编码）进行解码。匹配编码库的输入结构。

The two functions in openCV cvLoadImage and cvSaveImage accept file path's as arguments.

For example, when saving a image it's cvSaveImage("/tmp/output.jpg", dstIpl) and it writes on the disk.

Is there any way to feed this a buffer already in memory? So instead of a disk write, the output image will be in memory.

I would also like to know this for both cvSaveImage and cvLoadImage (read and write to memory buffers). Thanks!

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My goal is to store the Encoded (jpeg) version of the file in Memory. Same goes to cvLoadImage, I want to load a jpeg that's in memory in to the IplImage format.

解决方案

There are a couple of undocumented functions in the SVN version of the libary:

CV_IMPL CvMat* cvEncodeImage( const char* ext, 
                              const CvArr* arr, const int* _params )

CV_IMPL IplImage* cvDecodeImage( const CvMat* _buf, int iscolor )

Latest check in message states that they are for native encoding/decoding for bmp, png, ppm and tiff (encoding only).

Alternatively you could use a standard image encoding library (e.g. libjpeg) and manipulate the data in the IplImage to match the input structure of the encoding library.

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