I am following this tutorial to understand haar features. While writing following code:
import numpy as np import cv2 face_cascade = cv2.CascadeClassifier('haarcascade_frontalface_default.xml') eye_cascade = cv2.CascadeClassifier('haarcascade_eye.xml') img = cv2.imread('Sachin.jpeg') gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY) faces = face_cascade.detectMultiScale(gray, 1.3, 5)
getting following error:
File "<ipython-input-6-0b479e459b0f>", line 1, in <module> faces = face_cascade.detectMultiScale(gray, 1.3, 5) error: /home/travis/miniconda/conda-bld/conda_1486587069159/work/opencv-3.1.0/modules/objdetect/src/cascadedetect.cpp:1639: error: (-215) !empty() in function detectMultiScale
(Sachin is the image i downloaded from google, of size (237,237,3) and after converting gray it is (237,237) with min=23, max=210. I am using opencv 3.1.0 with python 3.6, installed using command conda install -c menpo opencv3. i am trying for this solution but unable to find xml file in my desktop. How to solve problem.
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Answer
You need to specify the full paths to the XML files for Haar Cascade.
On Ubuntu 16.04, these files can be found in /usr/share/opencv/haarcascades
.