edge detection using python

Question

import cv2
import numpy as np

cap = cv2.VideoCapture()

while True:
    _, frame = cap.read()

    laplacia = cv2.Laplacian(frame, cv2.CV_64F)

    cv2.imshow('original', frame)
    cv2.imshow('laplacian', laplacia)

    k = cv2.waitKey(5) & 0xFF
    if k==27:
        break

cv2.destroyAllWindows()
cap.release()

I am getting this error

#laplacia = cv2.Laplacian(frame, cv2.CV_64F)
cv2.error: C:\build\master_winpack-bindings-win64-vc14-static\opencv\modules\core\src\matrix.cpp:981: error: (-215) dims <= 2 && step[0] > 0 in function cv::Mat::locateROI

you cannot put a colour image into cv2.Laplacian(). convert it to grayscale — Piglet
– Piglet, Commented Nov 16, 2017 at 16:04

Sreeram TP · Accepted Answer · 2017-11-16 17:22:00Z

1

cv2.Laplacian() won't work with Color images.

You can go through OpenCV Documentation for knowing more..Image Gradients

You must convert the frame you have captured to gray scale and then apply Laplacian

gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)

You can convert to gray scale as shown above..

answered Nov 16, 2017 at 17:22

Sreeram TP

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3 Comments

Nagaraj Over a year ago

Sreeram, I still got the same error after converting to grayscale.

Sreeram TP Over a year ago

Can you capture image from the camera and display it.??

Nagaraj Over a year ago

Yes, I did that.

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