CODEWITHSUNDEEP
pythonopencv
user3218971
user3218971

Reputation: 569

mat is not a numerical tuple : openCV error

i have write down a code showing error i ma not getting it: Please help: Its showing mat is not a numerical tuple:

import cv
import cv2
capture = cv2.VideoCapture("j.3gp")

while(1):

    _, frame1 = capture.read()

    grayImage1 = cv2.cvtColor(frame1, cv2.COLOR_BGR2GRAY)
    _, frame2 = capture.read()
    grayImage2 = cv2.cvtColor(frame2, cv2.COLOR_BGR2GRAY)
    differenceImage = cv2.absdiff(grayImage1,grayImage2)
    thresholdImage = cv2.threshold(differenceImage,25,255,cv2.THRESH_BINARY)
    cv2.imshow("Difference Image", differenceImage)
    cv2.imshow("threshold Image", thresholdImage)
    cv2.imshow("Image", frame1)
    k = cv2.waitKey(30) & 0xff


Error arising :
-----------------------------------------------------------------------------------------

Traceback (most recent call last):
  File "Desk.py", line 15, in <module>
    cv2.imshow("threshold Image", thresholdImage)
TypeError: mat is not a numerical tuple

Upvotes: 12

Views: 29044

Answers (3)

Bhanuka Gajanayake
Bhanuka Gajanayake

Reputation: 1

_,img_otsu = cv.threshold(img_2,127,255, cv.THRESH_BINARY+cv.THRESH_OTSU)

use this also

Upvotes: 0

user3218971
user3218971

Reputation: 569

I got the answer myself: cv2.threshold returns two values and adding an extra variable at the start rectifies the error like given below as I did in capture.read()

thresholdImage = cv2.threshold(differenceImage,25,255,cv2.THRESH_BINARY)

should be: 

_ ,thresholdImage = cv2.threshold(differenceImage,25,255,cv2.THRESH_BINARY)

Upvotes: 27

gobrandal
gobrandal

Reputation: 33

_ ,thresholdImage = cv2.threshold(differenceImage,25,255,cv2.THRESH_BINARY)

could also be

thresholdImage = cv2.threshold(differenceImage,25,255,cv2.THRESH_BINARY)**[1]**

Upvotes: 2

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