RGB图像无法从ByteArray正确加载：opencv java（封装在scala中）

Question

I have a camera streaming raw RGB data to the cloud. I am picking up that data and processing it in Spark (using scala and OpenCV Java). I am having a problem loading correctly the RGB. This is the original image:

And this is what I am getting instead:

The code I am using for this is:

//mainCam is a byte array: val mainCam: Array[Byte]

val mainCam_mat = new Mat (360, 480, CvType.CV_8UC3)
mainCam_mat.put(0,0,mainCam)

//Destination is the path and file name e.g. /tmp/test/123.jpeg
Highgui.imwrite(destination, mainCam_mat)

Based on the input below I tried forcing the little endiann and using intbuffers this way:

//mainCam is a byte array: val mainCam: Array[Byte]
val bb = IntBuffer.allocate(mainCam.length/4)
bb.put(ByteBuffer.wrap(mainCam).order(ByteOrder.LITTLE_ENDIAN).asIntBuffer()) 
mainCam_raw.put(0,0,bb.array.map(_.toByte))
//Destination is the path and file name e.g. /tmp/test/123.jpeg
Highgui.imwrite(destination, mainCam_mat)

The result is this:

Thanks Leonardo for suggesting that data was coming as 4 Channel RGBA. Updating the code to:

//mainCam is a byte array: val mainCam: Array[Byte]
val mainCam_mat = new Mat (360, 480, CvType.CV_8UC4)
mainCam_mat.put(0,0,mainCam)
//Destination is the path and file name e.g. /tmp/test/123.jpeg
Highgui.imwrite(destination, mainCam_mat)

The result is as follows:

There is still some grain on the image compared to the first visualization. Any thoughts on that?

Answer 1

Thanks a lot for all your comments! They pointed me in the right direction.

In the end I went back to the source and found that the configuration was changed. I was getting 640*480 image with RGB channels.

This code works:

//mainCam is a byte array: val mainCam: Array[Byte]
val mainCam_mat = new Mat (480, 640, CvType.CV_8UC3)
mainCam_mat.put(0,0,mainCam)
//Destination is the path and file name e.g. /tmp/test/123.jpeg
Highgui.imwrite(destination, mainCam_mat)

The result: