How to extract red color plane in OpenCV C++

2

asked May 18 '13

Ali Tillawi
49 ●2 ●2 ●8

How to extract red color plane in OpenCV C++?

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5

answered May 18 '13

berak
32993 ●7 ●81 ●312

easy!

Mat src=imread("my.png");
Mat planes[3];
split(src,planes);  // planes[2] is the red channel

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Is it applicable for android programming in Java with openCv? if not then can you please suggest me the alternative for this code, Thank you.

khatri.kelash (Jan 18 '17)edit

http://docs.opencv.org/java/3.1.0/org...

berak (Jan 18 '17)edit

Thank you Sir for reply, I managed to write the code, and convert the related 3 channels from matrix form to bitmap form but code is not working. The app just show dialog box [Unfortunaly app has stopped].

khatri.kelash (Jan 21 '17)edit

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2

answered Oct 6 '15

Mizux
21 ●1 ●2

prefer to use void cv::extractChannel (InputArray src, OutputArray dst, int coi )

cv::Mat out; cv::extractChannel(in, out, 0) // Supposing RGB channel with red first out....

src: http://docs.opencv.org/master/d2/de8/group__core__array.html#gacc6158574aa1f0281878c955bcf35642

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0

answered May 21 '13

Ali Tillawi
49 ●2 ●2 ●8

updated May 21 '13

Thank you :)

I have used this one and it worked well:

IplImage* frame_r = cvCreateImage(size, IPL_DEPTH_8U, 1);
IplImage* frame_g = cvCreateImage(size, IPL_DEPTH_8U, 1);
IplImage* frame_b = cvCreateImage(size, IPL_DEPTH_8U, 1);

    cvSplit(frame, frame_b, frame_g, frame_r, NULL);

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2

What you are doing isn't C++ code but using the old C-style API. Keep in mind that the support for the old API will start to get less and less, since people are stimulated to use the newer, more clear C++ interfacing of OpenCV.

StevenPuttemans (May 21 '13)edit

Sir how to subtract among three planes example r-g+b

kamachisundaram (Nov 20 '14)edit

That is just a simple operator. I think you can subtract and add matrices. Have you tried

Mat temp = red - green + blue;

This should work for your needs!

StevenPuttemans (Nov 20 '14)edit

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How to extract red color plane in OpenCV C++

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