How to understand this exception raised in an OpenCV program

Question

I have got the following exception in my OpenCV program. I had the following image in my computer and I moved it to my mobile phone and read it by Mat imageRead = Highgui.imread("/mnt/sdcard/Pictures/2im00.png");

Then I tried to convert its color space to HSV using the following statement, and got the exception on this statement.

Imgproc.cvtColor(imageRead, hsvImage, Imgproc.COLOR_RGB2HSV);

But the exception does not seem to tell me anything more than that it is in the function cvtColor, or I can't read the encoded information there.

So the question is that how do I find out why I am getting this exception?

Is there any coded information there, like some codes (like scn==3 or scn==4 or error:-215 or depth etc etc), which I can browse somewhere to find out why I am getting the exception?

Have a look also here. OpenCV it's saying you that your source image channels scnshould be 3 or 4, while it's depth should be unsigned char (CV_8U) or float (CV_32F) — Miki
– Miki, Commented Dec 10, 2015 at 22:58

Community · Accepted Answer · 2017-05-23 12:23:53Z

2

Most probably, Assertion failure occurs because you are passing an empty image to the cvtColor function. Or The Mat image you are passing is not an CV_8U or CV_32F format.

I agree with Miki's comment for more details follow this link How to interpret c++ opencv Assertion error messages due to an error in cvtColor function?

edited May 23, 2017 at 12:23

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answered Dec 13, 2015 at 10:34

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1 Comment

Solace Over a year ago

You should also add the link from Miki's comment, because that will make your answer more useful for future visitors. (Don't forget to give due credit to them).

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