title: Opencv cornerHarris error
body: <p>I'm trying to detect point of interests (keypoints) in as munitiaes for fingerprint recognition:</p>
  
  <pre><code>import cv2 as cv
  import numpy as np
  input = cv.imread("C:\Users\ADNAN\Desktop\FingClass.png");
  input2 = cv.threshold(input,127,255,cv.THRESH_BINARY)[1];
  dst = cv.cornerHarris(input2,2,3,0.04);
  </code></pre>
  
  <p>But cornerHarris throw an error I didn't understand</p>
  
  <pre><code>cv2.error: C:\builds\master_PackSlaveAddon-win32-vc12èstativ\opencv\modules\imgproc\src\corner.cpp:287: rror: (-215) src.type() == cv_8uc1 || src.type() == cv_32FC1 in function cv::cornerEigenValsVecs
  </code></pre>