Integer argument expected int got float in opencv

Question

I have displayed the code below, but when I try to execute it, get

Traceback (most recent call last):
  File "/home/decentmakeover2/Code/cv.py", line 22, in <module>
    img = cv2.circle(img,center, radius, (0,255, 0), 2)
TypeError: integer argument expected, got float

Im not exactly sure what the problem is, in the minEnclosingCircle the values have been converted to int, but i still get the same error, any ideas on what might be the problem?

import numpy as np
import cv2
import os
from scipy import ndimage

img = cv2.pyrDown(cv2.imread('img.jpeg'))
ret, thresh  = cv2.threshold(cv2.cvtColor(img.copy(), cv2.COLOR_BGR2GRAY), 127, 255, cv2.THRESH_BINARY)
image, contours, heir = cv2.findContours(thresh, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)

for c in contours:
    x, y , w, h = cv2.boundingRect(c)
    cv2.rectangle(img, (x,y), (x+w, y+h), (0, 255, 0), 2)

    rect  = cv2.minAreaRect(c)
    box = cv2.boxPoints(rect)
    box  = np.int0(box)
    cv2.drawContours(img, [box], 0 , (0, 0, 255), 3)

    (x,y), radius = cv2.minEnclosingCircle(c)
    center = (int(x), int(y))
    radius = int(radius)
    img = cv2.circle(img, center, radius, (0,255, 0), 2)

cv2.drawContours(img, contours, -1, (255, 0, 0), 1)   
cv2.imshow('contours',img)
cv2.waitKey(0)
cv2.destroyAllWindows()`

Please correct your Python code format !!!

Kinght 金
– Kinght 金

2017-10-16 10:36:12 +00:00
Commented Oct 16, 2017 at 10:36 — Kinght 金
– Kinght 金, Commented Oct 16, 2017 at 10:36

Chengsi Zhang · Accepted Answer · 2019-02-18 00:15:09Z

10

This answer is probably too late, but I found that cv2.circle only can accept centre coordinates precision up to float32. If the coordinates are in float64, it will throw this error. Simple solution is always converting centre coordinates to numpy.float32.

answered Feb 18, 2019 at 0:15

Chengsi Zhang

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Comments

Jazz · Accepted Answer · 2017-10-16 10:55:40Z

3

I have done small changes to your code for conversion of float numbers to integers. It is running without errors now. Check this:

import numpy as np
import cv2
import os
from scipy import ndimage

img = cv2.pyrDown(cv2.imread('img.jpeg'))
ret, thresh  = cv2.threshold(cv2.cvtColor(img.copy(), cv2.COLOR_BGR2GRAY), 127, 255, cv2.THRESH_BINARY)
image, contours, heir = cv2.findContours(thresh, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)

for c in contours:
    x, y ,w ,h = cv2.boundingRect(c)
    cv2.rectangle(img, (x,y), (x+w, y+h), (0, 255, 0), 2)

    rect  = cv2.minAreaRect(c)
    box = cv2.boxPoints(rect)
    box  = np.int0(box)
    cv2.drawContours(img, [box], 0 , (0, 0, 255), 3)

    (x,y), radius = cv2.minEnclosingCircle(c)
    x = np.round(x).astype("int")
    y = np.round(y).astype("int")
    center = (x,y)
    radius = np.round(radius).astype("int")
    cv2.circle(img, center, radius, (0,255, 0), 2)

cv2.drawContours(img, contours, -1, (255, 0, 0), 1)   
cv2.imshow('contours',img)
cv2.waitKey(0)
cv2.destroyAllWindows()

edited Oct 16, 2017 at 10:55

answered Oct 16, 2017 at 7:29

Jazz

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1 Comment

markroxor Over a year ago

I wanted exact floats as centres. Casting to int is not precise enough for me.

onur aslan · Accepted Answer · 2017-10-16 07:13:42Z

2

Modify your code as follows you do not need to use return value of cv2.circle.

cv2.circle(img,center, radius, (0,255, 0), 2)

answered Oct 16, 2017 at 7:13

onur aslan

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1 Comment

Jazz Over a year ago

This doesn't remove error as error is due to float input arguments which should be integers. So, I think not exact solution of your error.

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