Compressing a raw image buffer

Question

I capture a raw image from a grayscale camera. When I transfer the image to OpenCV's IplImage and use cvSaveImage("image.jpg",image) , the image is saved with a size of around 160K. Whereas, if I use fwrite function in C to save the image buffer in .pgm format, the saved image size is 1.4M.

My question is:

Does cvSaveImage() compress the image into the specified format while saving? Actually, I am working on a smart camera with ARM platform and I want to avoid the overhead of cross-compiling OpenCV for ARM. How can I compress this image to .jpg without using cvSaveImage , but rather using C functions?

Answer 1

我相信嵌入式JPEG可能就是您想要的。

Answer 2

Or try the Independent JPEG Group source code.

http://www.ijg.org/