java - input Mat used in goodFeatureToTrack -

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i'm trying detect feature in face goodfeaturetotrack function in java. crashes there. code:

mat eyeregion = detectcascade();//i used here cascadeclassifier detect eye region if(eyeregion.empty())     log.i("face_calibrated","eye region empty");

i make sure region not empty.

if(eyeregion.channels()==1)  {   //i convert mat rgb detectfeatures     imgproc.cvtcolor(eyeregion, eyeregion, imgproc.color_gray2rgb);     log.i("face_calibrated","eyeregion channel1"); }

here problem:

imgproc.goodfeaturestotrack(eyeregion,cornersa,4,0.01,5.0,null,3,false,0.04);

i have declared cornersa global matofpoint 

public matofpoint cornersa = new matofpoint();

what type of input mat (rgb or gray) should used in function?


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