cv2.contourArea(cnt)

[sudhasubramaniam]

This is my code
import cv2
import numpy as np
img = cv2.imread('index.jpeg',0)
ret,thresh = cv2.threshold(img,127,255,0)
_,contours,hierarchy= cv2.findContours(thresh, 1, 2)

cnt = contour[0]
M = cv2.moments(cnt)
print(M)
area = cv2.contourArea(cnt)
perimeter = cv2.arcLength(cnt,True)

I'm getting this error. some one pls help me resolving it.
error: /tmp/build/80754af9/opencv_1512491964794/work/modules/imgproc/src/shapedescr.cpp:319: error: (-215) npoints >= 0 && (depth == 5 || depth == 4) in function contourArea

[pallavipundir]

Same issue.Have you got any solution for this?

[aijedi]

Same Issue, someone please respond.

min_YCrCb = numpy.array([0,133,77],numpy.uint8) max_YCrCb = numpy.array([255,173,127],numpy.uint8) sourceImage = cv2.imread('abc.png') imageYCrCb = cv2.cvtColor(sourceImage,cv2.COLOR_BGR2YCR_CB) skinRegion = cv2.inRange(imageYCrCb,min_YCrCb,max_YCrCb) contours, hierarchy, _ = cv2.findContours(skinRegion, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE) for i, c in enumerate(contours): print (i) print (c) print (cv2.contourArea(c))
`

error: OpenCV(3.4.1) /io/opencv/modules/imgproc/src/shapedescr.cpp:272: error: (-215) npoints >= 0 && (depth == 5 || depth == 4) in function contourArea

[xixiU]

the error occurs in findContours
you can use the following:

cnts = cv2.findContours(edged, cv2.RETR_EXTERNAL,cv2.CHAIN_APPROX_SIMPLE)

cnts = cnts[0] if len(cnts) == 2 else cnts[1]

The detail shows in the link.