opencv从缓冲区读取jpeg映像 [英] opencv read jpeg image from buffer

问题描述

我有一个包含jpeg图片数据的 unsigned char * 缓冲区。我想使用c + +和opencv显示该图像。如果我这样做：

I have an unsigned char* buffer containing data of a jpeg image. I would like to display that image using c++ and opencv. If i do:

Mat img(Size(640, 480), CV_8UC3, data);
namedWindow("image", 1);
imShow("image", img);

我得到一个嘈杂的像素混乱。

I get a noisy mess of pixels.

我想这是因为数据是jpeg（带头）。因为这样工作：

I suppose it's because the data is jpeg (with a header). Because this works:

Mat imgbuf(Size(640, 480), CV_8UC3, data);
Mat img = imdecode(imgbuf, CV_LOAD_IMAGE_COLOR);

但是我不能使用imdecode函数，因为它是基于GTK 2的highgui.h，在我的项目中我使用GTK 3。

BUT I cannot use the imdecode function as it is from highgui.h which is based upon GTK 2, and in my project I use GTK 3.

那么，如何显示缓冲区数据？有没有办法解码jpeg图像而不是在opencv中的imdecode，如果这是问题。我真的不想重建opencv与Qt ...

So, how can I display the buffer data? Is there a way to decode the jpeg image other than imdecode in opencv, if that's the problem. I don't really want to have to rebuild opencv with Qt...

任何其他建议？

（使用Linux）

谢谢！

推荐答案

使用 libjpeg /tkimg/tkimg/libjpeg/libjpeg.docrel =nofollow> libjpeg API文档下的解压缩详细信息。

I have decompressed the JPEG image using libjpeg using the standard procedure described in the libjpeg API documentation under 'Decompression details'.

解压缩数据后你可以使用它来构造 cv :: Mat 。注意，解压缩的图像是RGB格式，而openCV使用BGR格式，因此 cvtColor（）操作格式 CV_RGB2BGR 。

After having decompressed the data you can use it to construct the cv::Mat. Mind you, the decompressed image is in RGB format, whereas openCV uses a BGR format so a cvtColor() operation with format CV_RGB2BGR is needed.

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